US20070236967A1 - Full-resonant power circuit device for receiving a variable input voltage - Google Patents

Full-resonant power circuit device for receiving a variable input voltage Download PDF

Info

Publication number
US20070236967A1
US20070236967A1 US11/399,329 US39932906A US2007236967A1 US 20070236967 A1 US20070236967 A1 US 20070236967A1 US 39932906 A US39932906 A US 39932906A US 2007236967 A1 US2007236967 A1 US 2007236967A1
Authority
US
United States
Prior art keywords
coupled
input voltage
full
square wave
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US11/399,329
Other versions
US7286373B1 (en
Inventor
Chih-Lung Liu
Tsai-Liang Hsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lite On Technology Corp
Original Assignee
Li Shin International Enterprise Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Li Shin International Enterprise Corp filed Critical Li Shin International Enterprise Corp
Priority to US11/399,329 priority Critical patent/US7286373B1/en
Assigned to LI SHIN INTERNATIONAL ENTERPRISE CORPORATION reassignment LI SHIN INTERNATIONAL ENTERPRISE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HSU, TSAI-LIANG, LU, CHIH-LUNG
Publication of US20070236967A1 publication Critical patent/US20070236967A1/en
Application granted granted Critical
Publication of US7286373B1 publication Critical patent/US7286373B1/en
Assigned to LITE-ON TECHNOLOGY CORPORATION reassignment LITE-ON TECHNOLOGY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LI SHIN INTERNATIONAL ENTERPRISE CORPORATION
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33571—Half-bridge at primary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • H02M7/4818—Resonant converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Definitions

  • the present invention relates to a full-resonant power circuit device for receiving a variable input voltage, and more particularly, the full-resonant power circuit device switches to vary a resonance inductor for providing a stable voltage to a load in response to the variable input voltage.
  • FIG. 1 is a schematic view of a half-bridge full-resonant converter of the prior art.
  • a structure of a full-resonant converter is based on a half-bridge topology or a full-bridge topology.
  • a switch Q 1 and a switch Q 2 are connected to be a half-bridge structure and are switched by a variable switching frequency controlling method.
  • a switching frequency between the switch Q 1 and switch Q 2 is higher than a resonance frequency obtained from a resonance capacitor C r and a resonance inductor L r , the switch Q 1 and the switch Q 2 are conducted at a zero voltage for reducing the consumption of the switch Q 1 and the switch Q 2 therebetween.
  • the half-bridge full-resonant power circuit adjusts the switching frequency between the switch Q 1 and the switch Q 2 or the resonance frequency obtained from the resonance capacitor C r and the resonance inductor L r for adjusting a magnitude of an output voltage V o .
  • the value of the resonance inductor L r should be designed in response to a variational input voltage AC.
  • the range of the variational input voltage AC can't too large for the half-bridge or the full-bridge full-resonant converter.
  • FIG. 2 is schematic view of the half-bridge full-resonant converter with a power factor corrector (PFC) of the prior art.
  • the half-bridge full-resonant converter is often applied to supply a high power, and due to the high power of the full-resonant converter, the power factor of the full-resonant converter is relatively low. Therefore, it is often to use a power factor corrector 2 to improve the power factor so as to conform to the IEC61000-3-2 standards. And the power factor corrector 2 not only improves the power factorbut provides a stable voltage to the full-resonant converter so as to stabilize the output voltage V o thereof.
  • the power factor corrector 2 boosts variational input voltage AC into a supply voltage V in for being used by the full-resonant converter, the power factor corrector 2 will produce a high current in the conversion condition to increase the consumption of a switch transistor Q PFC of the power factor corrector 2 so as to reduce the efficiency of the power circuit device.
  • the inventor of the present invention recognizes the above shortage should be corrected and special effort has been paid to research this field.
  • the present invention is presented with reasonable design and good effect to resolve the above problems.
  • the present invention provides a full-resonant power circuit device for receiving a variable input voltage, wherein a power factor correcting circuit separates the variable input voltage into a plurality of power voltages.
  • the full-resonant power circuit device controls the switch transistors for switching so as to feed proper resonance inductors by detecting the variable input voltage and improve the efficiency of the power circuit device.
  • a power factor corrector for receiving a variable input voltage and boosting the variable input voltage to be a supply voltage
  • a square wave generator for producing a series of square wave voltages in response to the supply voltages.
  • the present invention has a primary resonance loop coupled with the square wave generator, includes a serial capacitor, a first serial inductor, and a second serial inductor that are mutually serially connected, and a first switch is coupled with the primary resonance loop.
  • at least one secondary resonance loop is coupled with the square wave generator, have the serial capacitor is coupled with the first serial inductor and the first serial inductor is coupled with at least one auxiliary serial inductor, and at least one second switch is separately coupled with the secondary resonance loops.
  • a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave, and a voltage detector for detecting the variable input voltage, and separately controlling the first switch to conduct a function of the primary resonance loop and the second switch to conduct a function of the secondary resonance loop in response to a magnitude of the variable input voltage.
  • DC direct current
  • a power factor corrector for receiving a variable input voltage and boosting the variable input voltage to be a supply voltage
  • a square wave generator for producing a series of square wave voltages in response to the supply voltages.
  • the present invention has a primary resonance loop coupled with the square wave generator, includes a serial capacitor, a first serial inductor, and a second serial inductor that are mutually serially connected, and a first switch is coupled with the primary resonance loop.
  • at least one secondary resonance loop is coupled with the square wave generator, have the first serial inductor is coupled with at least one auxiliary serial capacitor, and at least one second switch is separately coupled with the secondary resonance loops.
  • a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave, and a voltage detector for detecting the variable input voltage, and separately controlling the first switch to conduct a function of the primary resonance loop and the second switch to conduct a function of the secondary resonance loop in response to a magnitude of the variable input voltage.
  • DC direct current
  • FIG. 1 is a schematic view of a half-bridge full-resonant converter of the prior art
  • FIG. 2 is schematic view of the half-bridge full-resonant converter with a power factor corrector (PFC) of the prior art
  • FIG. 3 is a schematic view of a first embodiment of a full-resonant power circuit device for receiving a variable input voltage of the present invention.
  • FIG. 4 is a schematic view of a second embodiment of the full-resonant power circuit device for receiving a variable input voltage of the present invention.
  • FIG. 3 is a schematic view of a first embodiment of a full-resonant power circuit device for receiving a variable input voltage of the present invention.
  • the half-bridge full-resonant power circuit device 1 includes a power factor corrector 14 receives the variable input voltage AC and boosting the variable input voltage AC to be a supply voltage V in , and a square wave generator 10 is coupled with the power factor corrector 14 for producing a series of square wave voltages (not shown) in response to the supply voltages V in and the square wave generator 10 has switches Q 1 , Q 2 connected to be a half-bridge structure or four switches (not shown) connected to be a full-bridge structure.
  • a primary resonance loop is coupled with the square wave generator 10 , has a serial capacitor C r is coupled with a first serial inductor L r1 and the first serial inductor L r1 is coupled with a second serial inductor L r2 , and a first switch S 1 is coupled with the primary resonance loop and a ground reference G.
  • a secondary resonance loop is coupled with the square wave generator 10 , has the serial capacitor C r is coupled with the first serial inductor L r1 and the first serial inductor L r1 is coupled with an auxiliary serial inductor L c , and a second switch S 2 is separately coupled with the secondary resonance loop and the ground reference G.
  • the half-bridge full-resonant power circuit device 1 further comprises a transformer T, a primary side of the transformer T has the first serial inductor L r1 and the second serial inductor L r2 and a secondary side of the transformer T is coupled with a rectifier circuit 16 , and the transformer T receiving the series of square wave voltages for providing a direct current (DC) voltage V o to a load circuit R o and the rectifier circuit 16 is a center tap rectifier circuit.
  • DC direct current
  • a voltage detector 12 for detecting the variable input voltage AC or the supply voltages V in , and separately controlling the first switch S 1 to conduct a function of the primary resonance loop and the second switch S 2 to conduct a function of the secondary resonance loop according to a magnitude of the variable input voltage AC or the supply voltages V in .
  • the power factor corrector 14 is used to divide the variable input voltage AC into an AC low voltage (90-132 volts) and an AC high voltage (180-264 volts) so as to make the voltages conform to specifications of a global common variable input voltage AC.
  • AC low voltage the power factor corrector 14 detects the AC low voltage and boosts it to a 240-volt supply voltage
  • AC high voltage the power factor corrector 14 detects the AC high voltage and boosts it to 400-volt supply voltage.
  • a voltage difference between an input end (90-132 volts or 180-264 volts) of the power factor corrector 14 and an output end (240 volts or 400 volts) of the power factor corrector 14 is smaller than a voltage difference of the conventional power factor corrector, a current is relatively smaller, and losses of a switch transistor Q PFC of the power factor corrector 14 are smaller so as to improve the efficiency of the power circuit device.
  • the power factor corrector 14 is also used to divide the variable input voltage AC into a plurality of sections so as to output different kinds of the supply voltages V in .
  • the voltage detector 12 of the half-bridge full-resonant power circuit device 1 for receiving the variable input voltage AC and the supply voltages V in to switch the first switch S 1 or the second switches S 2 according to the fluctuation of the variable input voltage AC and the supply voltages V in to suitably add resonance inductor L r to be used for adjusting a resonance frequency to stabilize the output voltage V o .
  • a low voltage i.e.
  • the resonance loop can have a wide expansion.
  • the secondary resonance loop has more one second switches S 2 and a plurality of auxiliary serial inductors L c to obtain a multi-section adjustment of the secondary resonance loop.
  • a voltage difference between the input end of the power factor corrector 14 and the output end of the power factor corrector 14 is minimal and losses of the switch transistor QPFC of the power factor corrector 14 are relatively minimal so as to improve the efficiency of the power circuit device.
  • the first switches S 1 and the second switches S 2 of the present invention are widely selected such as BJTs, MOSFETs, SCRs, RELAYs, IGBT, or so on.
  • FIG. 4 is a schematic view of a second embodiment of the full-resonant power circuit device for receiving a variable input voltage of the present invention.
  • the differences between the half-bridge full-resonant power circuit device 1 and the half-bridge full-resonant power circuit device 3 are the primary resonance loops and the secondary resonance loops.
  • the primary resonance loop of the half-bridge full-resonant power circuit device 3 has a serial capacitor C r , a first serial inductor L r1 , and a second serial inductor L r2 are mutually connected, and a first switch S 1 is coupled with the primary resonance loop and a ground reference G; the secondary resonance loop has the first serial inductor L r1 and an auxiliary serial capacitor C c are mutually connected, and a first switch S 2 is coupled with the secondary resonance loop and the ground reference G.
  • the voltage detector 12 of the half-bridge full-resonant power circuit device 3 for receiving the variable input voltage AC and the supply voltages V in to switch the first switch S 1 or the second switches S 2 according to the fluctuation of the variable input voltage AC and the supply voltages V in to suitably add resonance inductor L r to be used for adjusting a resonance frequency to stabilize the output voltage V o .
  • a low voltage i.e.
  • the resonance loop can have a wide expansion.
  • the secondary resonance loop has more one second switches S 2 and a plurality of auxiliary serial capacitor C c to obtain a multi-section adjustment of the secondary resonance loop.
  • a voltage difference between the input end of the power factor corrector 14 and the output end of the power factor corrector 14 is minimal and losses of the switch transistor QPFC of the power factor corrector 14 are relatively minimal so as to improve the efficiency of the power circuit device.
  • the first switches S 1 and the second switches S 2 of the present invention are widely selected such as BJTs, MOSFETs, SCRs, RELAYs, IGBT, or so on.
  • the full-resonant power circuit device for receiving a variable input voltage that the power factor correcting circuit for separating the variable input voltage AC into a plurality of supply voltage sections outputted, and the input voltage sections are detected to separately switch corresponding switch transistors for suitably adding resonance inductors to the input voltage sections to be used by the full-resonant power circuit device to reduce the large voltage difference of a conventional power factor corrector 2 so as to improve the efficiency of the power circuit device and improve a half-bridge resonance circuit that is only operated in a fixed voltage source.

Abstract

The present invention provides a full-resonant power circuit device for receiving a variable input voltage that a power factor correcting circuit for separating a variable input voltage AC into a plurality of supply voltages, and the input voltage sections are detected to separately switch corresponding switch transistors for suitably adding resonance inductors to the input voltage sections to be used by the full-resonant power circuit device to reduce the large voltage difference of a conventional power factor corrector so as to improve the efficiency of the power circuit device and improve a half-bridge resonance circuit that is only operated in a fixed voltage source.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the invention
  • The present invention relates to a full-resonant power circuit device for receiving a variable input voltage, and more particularly, the full-resonant power circuit device switches to vary a resonance inductor for providing a stable voltage to a load in response to the variable input voltage.
  • 2. Description of the Prior Art
  • Reference is made from FIG. 1, which is a schematic view of a half-bridge full-resonant converter of the prior art. In the present day, a structure of a full-resonant converter is based on a half-bridge topology or a full-bridge topology. A switch Q1 and a switch Q2 are connected to be a half-bridge structure and are switched by a variable switching frequency controlling method. When a switching frequency between the switch Q1 and switch Q2 is higher than a resonance frequency obtained from a resonance capacitor Cr and a resonance inductor Lr, the switch Q1 and the switch Q2 are conducted at a zero voltage for reducing the consumption of the switch Q1 and the switch Q2 therebetween. Moreover, the half-bridge full-resonant power circuit adjusts the switching frequency between the switch Q1 and the switch Q2 or the resonance frequency obtained from the resonance capacitor Cr and the resonance inductor Lr for adjusting a magnitude of an output voltage Vo.
  • However, no matter the half-bridge or the full-bridge full-resonant converter, for obtaining the stabilization of the output voltage Vo, the value of the resonance inductor Lr should be designed in response to a variational input voltage AC. Hence, the range of the variational input voltage AC can't too large for the half-bridge or the full-bridge full-resonant converter.
  • Reference is made from FIG. 2, which is schematic view of the half-bridge full-resonant converter with a power factor corrector (PFC) of the prior art. The half-bridge full-resonant converter is often applied to supply a high power, and due to the high power of the full-resonant converter, the power factor of the full-resonant converter is relatively low. Therefore, it is often to use a power factor corrector 2 to improve the power factor so as to conform to the IEC61000-3-2 standards. And the power factor corrector 2 not only improves the power factorbut provides a stable voltage to the full-resonant converter so as to stabilize the output voltage Vo thereof. However, the power factor corrector 2 boosts variational input voltage AC into a supply voltage Vin for being used by the full-resonant converter, the power factor corrector 2 will produce a high current in the conversion condition to increase the consumption of a switch transistor QPFC of the power factor corrector 2 so as to reduce the efficiency of the power circuit device.
  • The inventor of the present invention recognizes the above shortage should be corrected and special effort has been paid to research this field. The present invention is presented with reasonable design and good effect to resolve the above problems.
    • SUMMARY OF THE INVENTION
  • The present invention provides a full-resonant power circuit device for receiving a variable input voltage, wherein a power factor correcting circuit separates the variable input voltage into a plurality of power voltages. The full-resonant power circuit device controls the switch transistors for switching so as to feed proper resonance inductors by detecting the variable input voltage and improve the efficiency of the power circuit device.
  • In a first embodiment of the present invention, a power factor corrector for receiving a variable input voltage and boosting the variable input voltage to be a supply voltage, and a square wave generator for producing a series of square wave voltages in response to the supply voltages. Moreover, the present invention has a primary resonance loop coupled with the square wave generator, includes a serial capacitor, a first serial inductor, and a second serial inductor that are mutually serially connected, and a first switch is coupled with the primary resonance loop. And at least one secondary resonance loop is coupled with the square wave generator, have the serial capacitor is coupled with the first serial inductor and the first serial inductor is coupled with at least one auxiliary serial inductor, and at least one second switch is separately coupled with the secondary resonance loops. And a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave, and a voltage detector for detecting the variable input voltage, and separately controlling the first switch to conduct a function of the primary resonance loop and the second switch to conduct a function of the secondary resonance loop in response to a magnitude of the variable input voltage.
  • In a second embodiment of the present invention, a power factor corrector for receiving a variable input voltage and boosting the variable input voltage to be a supply voltage, and a square wave generator for producing a series of square wave voltages in response to the supply voltages. Moreover, the present invention has a primary resonance loop coupled with the square wave generator, includes a serial capacitor, a first serial inductor, and a second serial inductor that are mutually serially connected, and a first switch is coupled with the primary resonance loop. And at least one secondary resonance loop is coupled with the square wave generator, have the first serial inductor is coupled with at least one auxiliary serial capacitor, and at least one second switch is separately coupled with the secondary resonance loops. And a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave, and a voltage detector for detecting the variable input voltage, and separately controlling the first switch to conduct a function of the primary resonance loop and the second switch to conduct a function of the secondary resonance loop in response to a magnitude of the variable input voltage.
  • It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed. Other advantages and features of the invention will be apparent from the following description, drawings and claims.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The above and further advantages of this invention may be better understood by referring to the following description, taken in conjunction with the accompanying drawings, in which:
  • FIG. 1 is a schematic view of a half-bridge full-resonant converter of the prior art;
  • FIG. 2 is schematic view of the half-bridge full-resonant converter with a power factor corrector (PFC) of the prior art;
  • FIG. 3 is a schematic view of a first embodiment of a full-resonant power circuit device for receiving a variable input voltage of the present invention; and
  • FIG. 4 is a schematic view of a second embodiment of the full-resonant power circuit device for receiving a variable input voltage of the present invention.
  • The drawings will be described further in connection with the following detailed description of the present invention.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Reference is made from FIG. 3, which is a schematic view of a first embodiment of a full-resonant power circuit device for receiving a variable input voltage of the present invention. The half-bridge full-resonant power circuit device 1 includes a power factor corrector 14 receives the variable input voltage AC and boosting the variable input voltage AC to be a supply voltage Vin, and a square wave generator 10 is coupled with the power factor corrector 14 for producing a series of square wave voltages (not shown) in response to the supply voltages Vin and the square wave generator 10 has switches Q1, Q2 connected to be a half-bridge structure or four switches (not shown) connected to be a full-bridge structure. A primary resonance loop is coupled with the square wave generator 10, has a serial capacitor Cr is coupled with a first serial inductor Lr1 and the first serial inductor Lr1 is coupled with a second serial inductor Lr2, and a first switch S1 is coupled with the primary resonance loop and a ground reference G. A secondary resonance loop is coupled with the square wave generator 10, has the serial capacitor Cr is coupled with the first serial inductor Lr1 and the first serial inductor Lr1 is coupled with an auxiliary serial inductor Lc, and a second switch S2 is separately coupled with the secondary resonance loop and the ground reference G.
  • The half-bridge full-resonant power circuit device 1 further comprises a transformer T, a primary side of the transformer T has the first serial inductor Lr1 and the second serial inductor Lr2 and a secondary side of the transformer T is coupled with a rectifier circuit 16, and the transformer T receiving the series of square wave voltages for providing a direct current (DC) voltage Vo to a load circuit Ro and the rectifier circuit 16 is a center tap rectifier circuit. A voltage detector 12 for detecting the variable input voltage AC or the supply voltages Vin, and separately controlling the first switch S1 to conduct a function of the primary resonance loop and the second switch S2 to conduct a function of the secondary resonance loop according to a magnitude of the variable input voltage AC or the supply voltages Vin.
  • The power factor corrector 14 is used to divide the variable input voltage AC into an AC low voltage (90-132 volts) and an AC high voltage (180-264 volts) so as to make the voltages conform to specifications of a global common variable input voltage AC. In AC low voltage, the power factor corrector 14 detects the AC low voltage and boosts it to a 240-volt supply voltage; in AC high voltage, the power factor corrector 14 detects the AC high voltage and boosts it to 400-volt supply voltage. Hence, a voltage difference between an input end (90-132 volts or 180-264 volts) of the power factor corrector 14 and an output end (240 volts or 400 volts) of the power factor corrector 14 is smaller than a voltage difference of the conventional power factor corrector, a current is relatively smaller, and losses of a switch transistor QPFC of the power factor corrector 14 are smaller so as to improve the efficiency of the power circuit device. Moreover, the power factor corrector 14 is also used to divide the variable input voltage AC into a plurality of sections so as to output different kinds of the supply voltages Vin.
  • The voltage detector 12 of the half-bridge full-resonant power circuit device 1 for receiving the variable input voltage AC and the supply voltages Vin to switch the first switch S1 or the second switches S2 according to the fluctuation of the variable input voltage AC and the supply voltages Vin to suitably add resonance inductor Lr to be used for adjusting a resonance frequency to stabilize the output voltage Vo.
  • When the voltage detector 12 detects a high voltage, i.e. the first switch S1 is conducted, the serial capacitor Cr, the first serial inductor Lr1, and the second serial inductor Lr2 are mutually coupled as the primary resonance loop and a resonance inductor Lr equals Lr1 plus Lr2 (i.e. Lr=Lr1+Lr2) for providing the resonance frequency and larger winding numbers for the resonance circuit. When the voltage detector 12 detects a low voltage, i.e. the second switch S2 is conducted, the serial capacitor Cr, the first serial inductor Lr1, and the auxiliary serial inductor Lc are mutually coupled as the secondary resonance loop and a resonance inductor Lr equals Lr1 plus Lc (i.e. Lr=Lr1+Lc) for providing the resonance frequency and smaller winding numbers for the resonance circuit.
  • In this embodiment of the present invention, the resonance loop can have a wide expansion. When the power factor corrector 14 divides the variable input voltage AC into a plurality of sections to output different kinds of supply voltages Vin, the secondary resonance loop has more one second switches S2 and a plurality of auxiliary serial inductors Lc to obtain a multi-section adjustment of the secondary resonance loop. Hence, a voltage difference between the input end of the power factor corrector 14 and the output end of the power factor corrector 14 is minimal and losses of the switch transistor QPFC of the power factor corrector 14 are relatively minimal so as to improve the efficiency of the power circuit device. Moreover, the first switches S1 and the second switches S2 of the present invention are widely selected such as BJTs, MOSFETs, SCRs, RELAYs, IGBT, or so on.
  • Reference is made from FIG. 4, which is a schematic view of a second embodiment of the full-resonant power circuit device for receiving a variable input voltage of the present invention. The differences between the half-bridge full-resonant power circuit device 1 and the half-bridge full-resonant power circuit device 3 are the primary resonance loops and the secondary resonance loops.
  • The primary resonance loop of the half-bridge full-resonant power circuit device 3 has a serial capacitor Cr, a first serial inductor Lr1, and a second serial inductor Lr2 are mutually connected, and a first switch S1 is coupled with the primary resonance loop and a ground reference G; the secondary resonance loop has the first serial inductor Lr1 and an auxiliary serial capacitor Cc are mutually connected, and a first switch S2 is coupled with the secondary resonance loop and the ground reference G.
  • The voltage detector 12 of the half-bridge full-resonant power circuit device 3 for receiving the variable input voltage AC and the supply voltages Vin to switch the first switch S1 or the second switches S2 according to the fluctuation of the variable input voltage AC and the supply voltages Vin to suitably add resonance inductor Lr to be used for adjusting a resonance frequency to stabilize the output voltage Vo.
  • When the voltage detector 12 detects a high voltage, i.e. the first switch S1 is conducted, the serial capacitor Cr, the first serial inductor Lr1, and the second serial inductor Lr2 are mutually coupled as the primary resonance loop and a resonance inductor Lr equals Lr1 plus Lr2 (i.e. Lr=Lr1+Lr2) for providing the resonance frequency and larger winding numbers for the resonance circuit. When the voltage detector 12 detects a low voltage, i.e. the second switch S2 is conducted, the first serial inductor Lr1 and the auxiliary serial capacitor Cc are mutually coupled as the secondary resonance loop and a resonance inductor Lr equals Lr1 (i.e. Lr=Lr1) for providing the resonance frequency and smaller winding numbers for the resonance circuit.
  • In this embodiment of the present invention, the resonance loop can have a wide expansion. When the power factor corrector 14 divides the variable input voltage AC into a plurality of sections to output different kinds of supply voltages Vin, the secondary resonance loop has more one second switches S2 and a plurality of auxiliary serial capacitor Cc to obtain a multi-section adjustment of the secondary resonance loop. Hence, a voltage difference between the input end of the power factor corrector 14 and the output end of the power factor corrector 14 is minimal and losses of the switch transistor QPFC of the power factor corrector 14 are relatively minimal so as to improve the efficiency of the power circuit device. Moreover, the first switches S1 and the second switches S2 of the present invention are widely selected such as BJTs, MOSFETs, SCRs, RELAYs, IGBT, or so on.
  • It follows from what has been said that the full-resonant power circuit device for receiving a variable input voltage that the power factor correcting circuit for separating the variable input voltage AC into a plurality of supply voltage sections outputted, and the input voltage sections are detected to separately switch corresponding switch transistors for suitably adding resonance inductors to the input voltage sections to be used by the full-resonant power circuit device to reduce the large voltage difference of a conventional power factor corrector 2 so as to improve the efficiency of the power circuit device and improve a half-bridge resonance circuit that is only operated in a fixed voltage source.
  • Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have been suggested in the foregoing description, and others will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.

Claims (10)

1. A full-resonant power circuit device for receiving a variable input voltage, comprising:
a power factor corrector received the variable input voltage for boosting the variable input voltage into a supply voltage;
a square wave generator coupled with the power factor corrector for producing a series of square wave voltages in response to the supply voltage;
a primary resonance loop coupled with the square wave generator and composed of a serial capacitor, a first serial inductor and a second serial inductor, wherein the serial capacitor coupled with the first serial inductor and the first serial inductor coupled with the second serial inductor;
a first switch coupled with the primary resonance loop;
at least one secondary resonance loop coupled with the square wave generator and composed of the serial capacitor, the first serial inductor and at least one auxiliary serial inductor, wherein the serial capacitor coupled with the first serial inductor and the first serial inductor coupled with the auxiliary serial inductor;
at least one second switch separately coupled with the secondary resonance loop;
a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave voltages; and
a voltage detector for detecting the variable input voltage and separately controlling the first switch and the second switch in response to the variable input voltage.
2. The full-resonant power circuit device as in claim 1, wherein the square wave generator has two switches connected to be a half-bridge structure for generating the square wave voltages.
3. The full-resonant power circuit device as in claim 1, wherein the square wave generator has four switches connected to be a full-bridge structure for generating the square wave voltages.
4. The full-resonant power circuit device as in claim 1, wherein the voltage detector detects the variable input voltage, and separately controls the first switch to conduct the function of the primary resonance loop or the second switch to conduct the function of the secondary resonance loop in response to the variable input voltage.
5. The full-resonant power circuit device as in claim 1, wherein the rectifier circuit is a center tap rectifier circuit.
6. A full-resonant power circuit device for receiving a variable input voltage, comprising:
a power factor corrector received the variable input voltage for boosting the variable input voltage into a supply voltage;
a square wave generator coupled with the power factor corrector for producing a series of square wave voltages in response to the supply voltage;
a primary resonance loop coupled with the square wave generator and composed of a serial capacitor, a first serial inductor and a second serial inductor, wherein the serial capacitor coupled with the first serial inductor and the first serial inductor coupled with the second serial inductor;
a first switch coupled with the primary resonance loop;
a first switch coupled with the primary resonance loop;
at least one secondary resonance loop coupled with the square wave generator and composed of the first serial inductor and at least one auxiliary serial inductor, herein the first serial inductor coupled with the auxiliary serial capacitor;
at least one second switch separately coupled with the secondary resonance loop;
a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave voltages; and
a voltage detector for detecting the variable input voltage and separately controlling the first switch and the second switch in response to the variable input voltage.
7. The full-resonant power circuit device as in claim 6, wherein the square wave generator has two switches connected to be a half-bridge structure for generating the square wave voltages.
8. The full-resonant power circuit device as in claim 6, wherein the square wave generator has four switches connected to be a full-bridge structure for generating the square wave voltages.
9. The full-resonant power circuit device as in claim 6, wherein the voltage detector for detects the input voltage, and separately controls the first switch to conduct the function of the primary resonance loop or the second switch to conduct the function of the secondary resonance loop in response to a magnitude of the input voltage.
10. The full-resonant power circuit device as in claim 6, wherein the rectifier circuit is a center tap rectifier circuit.
US11/399,329 2006-04-07 2006-04-07 Full-resonant power circuit device for receiving a variable input voltage Expired - Fee Related US7286373B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/399,329 US7286373B1 (en) 2006-04-07 2006-04-07 Full-resonant power circuit device for receiving a variable input voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/399,329 US7286373B1 (en) 2006-04-07 2006-04-07 Full-resonant power circuit device for receiving a variable input voltage

Publications (2)

Publication Number Publication Date
US20070236967A1 true US20070236967A1 (en) 2007-10-11
US7286373B1 US7286373B1 (en) 2007-10-23

Family

ID=38575052

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/399,329 Expired - Fee Related US7286373B1 (en) 2006-04-07 2006-04-07 Full-resonant power circuit device for receiving a variable input voltage

Country Status (1)

Country Link
US (1) US7286373B1 (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090290384A1 (en) * 2008-05-21 2009-11-26 Flextronics, Ap, Llc High power factor isolated buck-type power factor correction converter
US20110002145A1 (en) * 2008-02-04 2011-01-06 Nxp B.V. Method of operating a resonant power converter and a controller therefor
US20110203840A1 (en) * 2010-02-23 2011-08-25 Flextronics Ap, Llc Test point design for a high speed bus
US8223522B2 (en) 2006-09-25 2012-07-17 Flextronics Ap, Llc Bi-directional regulator for regulating power
US20120195074A1 (en) * 2010-02-18 2012-08-02 University of Toronto Governing Council DC-DC Converter Circuit For High Input-To-Output Voltage Conversion
US20130121033A1 (en) * 2010-02-18 2013-05-16 Peter Waldemar Lehn Dc-dc converter circuit using llc circuit in the region of voltage gain above unity
US20130314070A1 (en) * 2012-05-25 2013-11-28 Kabushiki Kaisha Toshiba Dc-dc converter
US20140268903A1 (en) * 2013-03-14 2014-09-18 Infineon Technologies Ag System and Method for a Switched-Mode Power Converter
US8975523B2 (en) 2008-05-28 2015-03-10 Flextronics Ap, Llc Optimized litz wire
US20150162840A1 (en) * 2010-02-18 2015-06-11 Arda Power Inc Dc-dc converter circuit using an llc circuit in the region of voltage gain above unity
US9831787B1 (en) * 2016-05-27 2017-11-28 Nxp B.V. Resonant power converter with switchable reflected output voltage
US20190058407A1 (en) * 2016-02-15 2019-02-21 Valeo Systemes De Controle Moteur Insulated dc/dc converter
EP3447890A1 (en) * 2017-08-21 2019-02-27 Flex, Ltd. Reconstructive line modulated resonant converter
US20190068065A1 (en) * 2017-08-28 2019-02-28 Omron Corporation Llc resonant converter
US10236780B2 (en) * 2017-04-14 2019-03-19 Delta Electronics, Inc. Converter
US10277140B2 (en) 2017-08-31 2019-04-30 Google Llc High-bandwith resonant power converters
US10298138B2 (en) 2017-08-31 2019-05-21 Google Llc Programmable power adapter
US10917001B2 (en) 2017-08-21 2021-02-09 Flex Ltd. Adaptive resonant frequency converter
US11211864B2 (en) * 2019-06-19 2021-12-28 Acer Incorporated Power supply device
US11331011B2 (en) 2014-10-06 2022-05-17 Dräger Safety AG & Co. KGaA System for the transcutaneous determining of blood alcohol concentration

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005023291A1 (en) * 2005-05-20 2006-11-23 Sma Technologie Ag inverter
JP4245066B2 (en) * 2007-06-11 2009-03-25 サンケン電気株式会社 Multi-output switching power supply
TWI382642B (en) * 2008-05-22 2013-01-11 Acbel Polytech Inc Resonant circuit with narrow operating frequency band and resonant power converter
CN101741260A (en) * 2008-11-19 2010-06-16 鸿富锦精密工业（深圳）有限公司 Power unit and potential device
US9240729B2 (en) * 2009-06-30 2016-01-19 Keysight Technologies, Inc. Resonant converter for achieving low common-mode noise, along with isolated power supply and method employing the same
US9871459B2 (en) * 2013-05-30 2018-01-16 Enphase Energy, Inc. Method and apparatus for deriving current for control in a resonant power converter
WO2019170781A1 (en) * 2018-03-06 2019-09-12 Npc Tech Aps A resonant power converter
IT201900007974A1 (en) * 2019-06-04 2020-12-04 Eggtronic Eng S P A CONVERTER TO TRANSFER ELECTRIC POWER TO AN ELECTRICAL LOAD

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5768112A (en) * 1997-05-30 1998-06-16 Delco Electronics Corp. Sub-resonant series resonant converter having improved form factor and reduced EMI
US5986895A (en) * 1998-06-05 1999-11-16 Astec International Limited Adaptive pulse width modulated resonant Class-D converter
US6061253A (en) * 1997-12-03 2000-05-09 Fuji Electrical Co., Ltd. Variable frequency soft switching power supply with reduced noise and improved power factor
US7110269B2 (en) * 2003-05-14 2006-09-19 City University Of Hong Kong Soft-switching techniques for power inverter legs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5768112A (en) * 1997-05-30 1998-06-16 Delco Electronics Corp. Sub-resonant series resonant converter having improved form factor and reduced EMI
US6061253A (en) * 1997-12-03 2000-05-09 Fuji Electrical Co., Ltd. Variable frequency soft switching power supply with reduced noise and improved power factor
US5986895A (en) * 1998-06-05 1999-11-16 Astec International Limited Adaptive pulse width modulated resonant Class-D converter
US7110269B2 (en) * 2003-05-14 2006-09-19 City University Of Hong Kong Soft-switching techniques for power inverter legs

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8223522B2 (en) 2006-09-25 2012-07-17 Flextronics Ap, Llc Bi-directional regulator for regulating power
US20110002145A1 (en) * 2008-02-04 2011-01-06 Nxp B.V. Method of operating a resonant power converter and a controller therefor
US8339817B2 (en) * 2008-02-04 2012-12-25 Nxp B.V. Method of operating a resonant power converter and a controller therefor
US8102678B2 (en) * 2008-05-21 2012-01-24 Flextronics Ap, Llc High power factor isolated buck-type power factor correction converter
US20090290384A1 (en) * 2008-05-21 2009-11-26 Flextronics, Ap, Llc High power factor isolated buck-type power factor correction converter
US8975523B2 (en) 2008-05-28 2015-03-10 Flextronics Ap, Llc Optimized litz wire
US9318968B2 (en) * 2010-02-18 2016-04-19 University of Toronto Governing Council DC-DC converter circuit for high input-to-output voltage conversion
US20120195074A1 (en) * 2010-02-18 2012-08-02 University of Toronto Governing Council DC-DC Converter Circuit For High Input-To-Output Voltage Conversion
CN102859855A (en) * 2010-02-18 2013-01-02 彼得·瓦尔德玛·莱恩 Dc-dc Converter Circuit For High Input-to-output Voltage Conversion
US20130121033A1 (en) * 2010-02-18 2013-05-16 Peter Waldemar Lehn Dc-dc converter circuit using llc circuit in the region of voltage gain above unity
US20150162840A1 (en) * 2010-02-18 2015-06-11 Arda Power Inc Dc-dc converter circuit using an llc circuit in the region of voltage gain above unity
US9059636B2 (en) * 2010-02-18 2015-06-16 Peter Waldemar Lehn DC-DC converter circuit using LLC circuit in the region of voltage gain above unity
US20110203840A1 (en) * 2010-02-23 2011-08-25 Flextronics Ap, Llc Test point design for a high speed bus
US8586873B2 (en) 2010-02-23 2013-11-19 Flextronics Ap, Llc Test point design for a high speed bus
US20130314070A1 (en) * 2012-05-25 2013-11-28 Kabushiki Kaisha Toshiba Dc-dc converter
US9391532B2 (en) * 2013-03-14 2016-07-12 Infineon Technologies Ag System and method for a switched-mode power converter
US20140268903A1 (en) * 2013-03-14 2014-09-18 Infineon Technologies Ag System and Method for a Switched-Mode Power Converter
US11331011B2 (en) 2014-10-06 2022-05-17 Dräger Safety AG & Co. KGaA System for the transcutaneous determining of blood alcohol concentration
US20190058407A1 (en) * 2016-02-15 2019-02-21 Valeo Systemes De Controle Moteur Insulated dc/dc converter
US11621642B2 (en) * 2016-02-15 2023-04-04 Valeo Siemens Eautomotive France Sas Insulated DC/DC converter with magnetic component including primary part and secondary part separateed by electrical insulation barrier
US9831787B1 (en) * 2016-05-27 2017-11-28 Nxp B.V. Resonant power converter with switchable reflected output voltage
US20170346410A1 (en) * 2016-05-27 2017-11-30 Nxp B.V. Resonant power converter with switchable reflected output voltage
CN107437900A (en) * 2016-05-27 2017-12-05 恩智浦有限公司 Resonance power converter with changeable reflected output voltage
US10236780B2 (en) * 2017-04-14 2019-03-19 Delta Electronics, Inc. Converter
US10917001B2 (en) 2017-08-21 2021-02-09 Flex Ltd. Adaptive resonant frequency converter
CN109713908A (en) * 2017-08-21 2019-05-03 弗莱克斯有限公司 Reconstruct the resonance converter of line modulation
US10511231B2 (en) 2017-08-21 2019-12-17 Flex Ltd. Reconstructive line modulated resonant converter
EP3447890A1 (en) * 2017-08-21 2019-02-27 Flex, Ltd. Reconstructive line modulated resonant converter
US20190068065A1 (en) * 2017-08-28 2019-02-28 Omron Corporation Llc resonant converter
US10298138B2 (en) 2017-08-31 2019-05-21 Google Llc Programmable power adapter
US10277140B2 (en) 2017-08-31 2019-04-30 Google Llc High-bandwith resonant power converters
US11211864B2 (en) * 2019-06-19 2021-12-28 Acer Incorporated Power supply device

Also Published As

Publication number Publication date
US7286373B1 (en) 2007-10-23

Similar Documents

Publication Publication Date Title
US7286373B1 (en) Full-resonant power circuit device for receiving a variable input voltage
US8723428B2 (en) LED power source with over-voltage protection
US7375994B2 (en) Highly efficient isolated AC/DC power conversion technique
CN108028605B (en) Converter with hold-up operation
KR0160311B1 (en) High power factor power supply device
US9490704B2 (en) System and methods for controlling secondary side switches in resonant power converters
US8687388B2 (en) Three-phase soft-switched PFC rectifiers
US6483721B2 (en) Resonant power converter
US7554271B2 (en) Single stage PFC and power converter circuit
JPH11235054A (en) Electronic ballast circuit
US20160181925A1 (en) Bidirectional dc-dc converter
US8872499B2 (en) Power supply apparatus
US9325249B2 (en) Single stage boost-asymmetric LLC
WO2009139505A1 (en) Ac voltage control device
US8525429B2 (en) Method for controlling gas discharge lamps
US10707763B1 (en) Partially clamped resonant half-bridge converter for highly efficient constant power LED driver with inherent hard-switching protection
CN114531033A (en) Converter with a voltage detection circuit
US20140252991A1 (en) Electronic ballasts
KR101454158B1 (en) Electrolytic Capacitor-less Power Supply for Lighting LED Drive and 120Hz Ripple Reduction Method of the Same
JPH11500860A (en) Ballast system
JP3757577B2 (en) Discharge lamp lighting device
Agamy et al. A single stage three level resonant LLC AC/DC converter
JPH0992484A (en) Power-supply unit
JPH10243661A (en) Power supply, discharge lamp lighting device and lighting apparatus
JP2001035681A (en) Discharge lamp lighting device

Legal Events

Date Code Title Description
AS Assignment

Owner name: LI SHIN INTERNATIONAL ENTERPRISE CORPORATION, TAIW

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LU, CHIH-LUNG;HSU, TSAI-LIANG;REEL/FRAME:017478/0668

Effective date: 20060406

AS Assignment

Owner name: LITE-ON TECHNOLOGY CORPORATION, TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LI SHIN INTERNATIONAL ENTERPRISE CORPORATION;REEL/FRAME:021617/0771

Effective date: 20080919

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20151023