CN102237809A - Switching power circuit for three-phase intelligent electric energy meter - Google Patents
Switching power circuit for three-phase intelligent electric energy meter Download PDFInfo
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Abstract
The invention discloses a switching power circuit for a three-phase intelligent electric energy meter. The switching power circuit comprises a distributed load regulation device (1), a half-wave rectification and filtration device (2), a zero-line, over-voltage and electromagnetic interference monitoring and protection device (4) and a load control device (5), wherein the distributed load regulation device (1) is supplied with power by a three-phase four-wire power supply (6); the distributed load regulation device (1) is connected with one end of the half-wave rectification and filtration device (2); the other end of the half-wave rectification and filtration device (2) is output to a direct current (DC) / DC converter (3); the DC/DC converter (3) is connected with an electric energy meter functional circuit (7); one end of the zero-line, over-voltage and electromagnetic interference monitoring and protection device (4) is connected with the half-wave rectification and filtration device (2) and the DC/DC converter (3); the other end of the zero-line, over-voltage and electromagnetic interference monitoring and protection device (4) is connected with one end of the load control device (5); and the other end of the load control device (5) is connected with the distributed load regulation device (1). The switching power circuit for the three-phase intelligent electric energy meter has the advantages of low cost, high reliability and effective restraint capacity of strong electromagnetic interference and pole-end harmonic current interference.
Description
Technical field
The present invention relates to a kind of three-phase intelligent electric energy meter switching power circuit, belong to the electronic electric energy meter technical field.
Background technology
It is that basic line rectification power supply comes to the table in-line power that the most electric energy meters of present China all adopt Industrial Frequency Transformer, and this power-efficient is very low, has only 30% to 40% usually.Along with the intelligent innovation of electric energy meter, the power consumption of electric energy meter also increases considerably, for example the power consumption of three-phase table increases to several watts for one watt from original less than, and this is for the hundreds of millions of intelligent electric energy meter that is about to promote, and the increase of the overall power consumption of electric energy meter will be very surprising; On the other hand, the conversion of control energy fast and efficiently of switch power technology utilization power semiconductor, electric energy conversion efficient can possess very strong energy-saving and cost-reducing advantage up to more than 70%, so it is the desirable upgrading products of electrical power apparent source.But this technology will obtain large tracts of land to be promoted, and also need solve following several difficult:
(1), long-term reliability: intelligent electric energy meter needs continual reliability service of 24 hours every days, annual 365 days, 10 years, accurately metering and real time communication.Therefore it is high to the reliability requirement of power supply, considerably beyond to the general product for civilian use such as the reliability requirement of computer.
(2), extremely strong anti-electromagnetic interference capability: switching of electrical network high-voltage load switch or round thunder and lightning can cause strong electromagnetic interference when attacking.The Switching Power Supply that with the semiconductor device is core must effectively be resisted this type of interference capability, to guarantee the long-term accurately metering of intelligent electric energy meter.China is vast in territory, and transmission of electricity, power utilization environment are very complicated, and this problem becomes and has more challenge.
(3), anti-Harmonic Interference ability: China's electric railway and heavy industry equipment often discharge a large amount of Harmonic Interference electric currents to electrical network, can cause local power voltage seriously to distort.Electric energy meter electric source must effectively suppress this type of interference, keep accurate measurement.
(4), cost has competitiveness: the cost of Switching Power Supply must not be higher than the cost of existing linear power supply.
Chinese patent CN201811993 " three-phase and four-line low-power consumption Switching Power Supply electric energy table ", Chinese patent CN1410856A " device and its control method with electronic circuit of harmonic wave inhibition and voltage stabilizing function " and Chinese patent CN101533082A patents such as " a kind of electric energy meter halfwave rectifier circuits " and document have proposed multiple solution from different perspectives partly, but these solutions can't intactly address the above problem, and this also is the main cause that Switching Power Supply obtains promoting in China's electric energy meter industry so far not yet.Therefore, need provide a kind of new technical scheme to solve above-mentioned technical problem.
Summary of the invention
The purpose of this invention is to provide a kind of low cost, high-reliability, strong electromagnetic and extreme harmonic current are disturbed the three-phase intelligent electric energy meter switching power circuit with effective inhibition ability.
The technical solution used in the present invention is:
A kind of three-phase intelligent electric energy meter switching power circuit; it comprises distributed weight adjustment device; the halfwave rectifier filter of holding concurrently; zero line; overvoltage and electromagnetic interference monitoring and protective device; and load control unit; described distributed weight adjustment device is powered by three-phase four-wire power; described distributed weight adjustment device and halfwave rectifier filter one end of holding concurrently is connected; the described halfwave rectifier filter other end of holding concurrently exports the DC/DC converter to; described DC/DC converter is connected with the electric energy meter functional circuit; described zero line; monitoring of overvoltage and electromagnetic interference and protective device one end and the halfwave rectifier filter of holding concurrently is connected with the DC/DC converter; described zero line; overvoltage is connected the described load control unit other end and distributed weight adjustment device with the electromagnetic interference monitoring and the protective device other end with load control unit one end.
Described distributed weight adjustment device comprises power resistor R0, R1, R2 and R3, and described power resistor R0 connects the input side zero-power line, and described power resistor R1, R2 are connected input side power supply one phase voltage respectively with R3.
Described halfwave rectifier is held concurrently filter by high-voltage diode D1, D2, D3, inductance L 1 and high-pressure electrolysis capacitor C 1 are formed, the negative electrode of described high-voltage diode D1, D2, D3 links to each other with inductance L 1 one ends, described inductance L 1 other end links to each other with DC/DC converter input with high-pressure electrolysis capacitor C 1 positive pole, and the negative pole of described high-pressure electrolysis capacitor C 1 links to each other with resistance R 0.
Described zero line; overvoltage and electromagnetic interference monitoring and protective device are made up of sample circuit and control circuit; described sample circuit is by TVS Z1; resistance R 7; diode D9 and resistance R 6 are formed; described control circuit is by TVS Z2; resistance R 5; diode D7; diode D8 and P channel-style MOSFET M1 form; the negative electrode of described TVS Z1 connects the positive pole of high-pressure electrolysis capacitor C 1; the anode of described TVS Z1 connects resistance R 7 one ends; described resistance R 7 other ends are connected to the anode of diode D9; the negative electrode of the negative electrode of described diode D9 and diode D8; the negative electrode of diode D7; the negative electrode of TVS Z2 links to each other with the source electrode of P channel-style MOSFET M1; described resistance R 6 one sides and 1 anodal linking to each other of high-pressure electrolysis capacitor C; the anode of described resistance R 6 opposite sides and TVS Z2; the grid of P channel-style MOSFET M1 links to each other with resistance R 5 one sides, the drain electrode of described P channel-style MOSFET M1 and diode D7 anode; resistance R 5 opposite sides; inductance L 2 links to each other with capacitor C 2 one sides.
Described load control unit is by high-voltage diode D4, D5 and D6, power resistor R4, inductance L 2 and capacitor C 2 are formed, the anode of described high-voltage diode D4, D5 and D6 links to each other with resistance R 4 one sides, described resistance R 4 opposite sides link to each other with inductance L 2 one sides, and described inductance L 2 opposite sides link to each other with resistance R 5 one sides with capacitor C 2.
Power resistor R1, the R2 in the described distributed weight adjustment device and the other end of R3 are connected with the hold concurrently anode of filter input side high-voltage diode D1, D2, D3 of halfwave rectifier respectively, and the negative electrode of load control unit outlet side high-voltage diode D4, D5, D6 connects.
The invention has the beneficial effects as follows: by real-time monitoring and adjusting half-wave rectifying and wave-filtering output dc voltage, DC/DC converter voltage and neutral line current, in time dynamically to importing the distributed consumption of peak voltage, make this power circuit can resist zero line disconnection, the suffered overvoltage of power supply input side or strong electromagnetic such as pulse, harmonic current effectively, reliable because the realization of this programme is succinct, thereby it has very strong cost advantage and practical value.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Wherein: 1, distributed weight adjustment device; 2, the halfwave rectifier filter of holding concurrently; 3, DC/DC converter; 4, zero line, overvoltage and electromagnetic interference monitoring and protective device; 5, load control unit, 6, three-phase four-wire power, 7, the electric energy meter functional circuit; 8, sample circuit, 9, control circuit.
Embodiment
As illustrated in fig. 1 and 2; a kind of three-phase intelligent electric energy meter switching power circuit of the present invention; it comprises distributed weight adjustment device 1; the halfwave rectifier filter 2 of holding concurrently; zero line; overvoltage and electromagnetic interference monitoring and protective device 4; and load control unit 5; distributed weight adjustment device 1 is by three-phase four-wire power 6 power supplies; distributed weight adjustment device 1 and halfwave rectifier filter 2 one ends of holding concurrently are connected; halfwave rectifier filter 2 other ends of holding concurrently export DC/DC converter 3 to; DC/DC converter 3 is connected with electric energy meter functional circuit 7; zero line; monitoring of overvoltage and electromagnetic interference and protective device 4 one ends and the halfwave rectifier filter 2 of holding concurrently is connected with DC/DC converter 3; zero line; overvoltage is connected with load control unit 5 one ends with the electromagnetic interference monitoring and protective device 4 other ends; load control unit 5 other ends and distributed weight adjustment device 5; zero line; monitoring of overvoltage and electromagnetic interference and protective device 4 obtain monitor signal from hold concurrently filter 2 and DC/DC converter 3 of halfwave rectifier; and export monitor signal to load control unit 5, and then distributed weight adjustment device 1 is controlled.
Distributed weight adjustment device 1 comprises power resistor R0, R1, R2 and R3, and power resistor R0 connects the input side zero-power line, and power resistor R1, R2 are connected input side power supply one phase voltage respectively with R3; Halfwave rectifier is held concurrently filter 2 by high-voltage diode D1, D2, D3, inductance L 1 and high-pressure electrolysis capacitor C 1 are formed, the negative electrode of high-voltage diode D1, D2, D3 links to each other with inductance L 1 one ends, inductance L 1 other end links to each other with DC/DC converter input with high-pressure electrolysis capacitor C 1 positive pole, and the negative pole of high-pressure electrolysis capacitor C 1 links to each other with resistance R 0; Zero line, overvoltage and electromagnetic interference monitoring and protective device 4 are made up of sample circuit 8 and control circuit 9, sample circuit 8 is by TVS Z1, resistance R 7, diode D9 and resistance R 6 are formed, control circuit 9 is by TVS Z2, resistance R 5, diode D7, diode D8 and P channel-style MOSFET M1 form, the negative electrode of TVS Z1 connects the positive pole of high-pressure electrolysis capacitor C 1, the anode of TVS Z1 connects resistance R 7 one ends, resistance R 7 other ends are connected to the anode of diode D9, the negative electrode of the negative electrode of diode D9 and diode D8, the negative electrode of diode D7, the negative electrode of TVS Z2 links to each other with the source electrode of P channel-style MOSFET M1, resistance R 6 one sides and 1 anodal linking to each other of high-pressure electrolysis capacitor C, the anode of resistance R 6 opposite sides and TVS Z2, the grid of P channel-style MOSFET M1 links to each other with resistance R 5 one sides, the drain electrode of P channel-style MOSFET M1 and diode D7 anode, resistance R 5 opposite sides, inductance L 2 links to each other with capacitor C 2 one sides; Load control unit 5 is by high-voltage diode D4, D5 and D6, power resistor R4, inductance L 2 and capacitor C 2 are formed, and the anode of high-voltage diode D4, D5 and D6 links to each other with resistance R 4 one sides, resistance R 4 opposite sides link to each other with inductance L 2 one sides, and inductance L 2 opposite sides link to each other with resistance R 5 one sides with capacitor C 2; Power resistor R1, the R2 in the distributed weight adjustment device 1 and the other end of R3 are connected with the hold concurrently anode of filter 2 input side high-voltage diode D1, D2, D3 of halfwave rectifier respectively, and the negative electrode of load control unit 5 outlet side high-voltage diode D4, D5, D6 connects.
When three-phase four-wire power 6 input voltages just often, the halfwave rectifier filter 2 of holding concurrently carries out halfwave rectifier and low-pass filtering with the power supply input ac voltage; Compare with full-wave rectification scheme commonly used, the direct-current working volts amplitude that this scheme exports DC/DC converter 3 to is halved, make the maximum operating range of the used high-voltage semi-conductor device in the DC/DC converter 3 reduce by half, thereby design cost is minimized, product reliability is enhanced.When power supply input side zero line disconnected, common half-wave rectifying circuit can't operate as normal.The present invention program adopts the zero line monitoring device in time to open the standby current passage, thereby it is normal to guarantee to export to DC/DC conversion 3 device voltages.When the power supply input side is subjected to overvoltage or pulse, during strong electromagnetic such as harmonic current, zero line, overvoltage and electromagnetic interference monitoring and protective device 4 can dynamically carry out dividing potential drop to the rectifier power source output dc voltage to be regulated, and in time consume by 1 pair of excess energy of distributed weight adjustment device, thereby avoided rectification outlet side direct voltage because of the input side pulse, the continuing to add up of peak voltage that electromagnetic interference such as harmonic wave form and cause on the DC/DC converter 3 suffered voltage to raise gradually and damage, this has also been avoided using expensive control and high-voltage semi-conductor device in DC/DC converter 3, and has strengthened the reliability of circuit greatly; Another characteristics of the present invention program are that the realization of above-mentioned functions is based on succinct Power Electronic Circuit, thereby it has very strong cost advantage and practical value.
Claims (6)
1. three-phase intelligent electric energy meter switching power circuit; it is characterized in that: it comprises distributed weight adjustment device (1); the halfwave rectifier filter (2) of holding concurrently; zero line; overvoltage and electromagnetic interference monitoring and protective device (4); and load control unit (5); described distributed weight adjustment device (1) is powered by three-phase four-wire power (6); described distributed weight adjustment device (1) and halfwave rectifier filter (2) one ends of holding concurrently are connected; described halfwave rectifier filter (2) other end of holding concurrently exports DC/DC converter (3) to; described DC/DC converter (3) is connected with electric energy meter functional circuit (7); described zero line; monitoring of overvoltage and electromagnetic interference and protective device (4) one ends and the halfwave rectifier filter (2) of holding concurrently is connected with DC/DC converter (3); described zero line; overvoltage is connected described load control unit (5) other end and distributed weight adjustment device (1) with the electromagnetic interference monitoring and protective device (4) other end with load control unit (5) one ends.
2. a kind of three-phase intelligent electric energy meter switching power circuit according to claim 1, it is characterized in that: described distributed weight adjustment device (1) comprises power resistor (R0), (R1), (R2) and (R3), described power resistor (R0) connects the input side zero-power line, and described power resistor (R1), (R2) are connected input side power supply one phase voltage respectively with (R3).
3. a kind of three-phase intelligent electric energy meter switching power circuit according to claim 1, it is characterized in that: described halfwave rectifier is held concurrently filter (2) by high-voltage diode (D1), (D2), (D3), inductance (L1) and high-pressure electrolysis electric capacity (C1) are formed, the negative electrode of described high-voltage diode (D1), (D2), (D3) links to each other with inductance (L1) end, described inductance (L1) other end links to each other with DC/DC converter (3) input with high-pressure electrolysis electric capacity (C1) is anodal, and the negative pole of described high-pressure electrolysis electric capacity (C1) links to each other with resistance (R0).
4. a kind of three-phase intelligent electric energy meter switching power circuit according to claim 1; it is characterized in that: described zero line; overvoltage and electromagnetic interference monitoring and protective device (4) are made up of sample circuit (8) and control circuit (9); described sample circuit (8) is by TVS(Z1); resistance (R7); diode (D9) and resistance (R6) are formed; described control circuit (9) is by TVS(Z2); resistance (R5); diode (D7); diode (D8) and P channel-style MOSFET(M1) form; described TVS(Z1) negative electrode connects the positive pole of high-pressure electrolysis electric capacity (C1); described TVS(Z1) anode connects resistance (R7) end; described resistance (R7) other end is connected to the anode of diode (D9); the negative electrode of the negative electrode of described diode (D9) and diode (D8); the negative electrode of diode (D7); the negative electrode of TVS (Z2) links to each other with the source electrode of P channel-style MOSFET (M1); described resistance (R6) side links to each other with high-pressure electrolysis electric capacity (C1) is anodal; described resistance (R6) opposite side and TVS(Z2) anode; P channel-style MOSFET(M1) grid links to each other with resistance (R5) side, described P channel-style MOSFET(M1) drain electrode and diode (D7) anode; resistance (R5) opposite side; inductance (L2) links to each other with electric capacity (C2) side.
5. a kind of three-phase intelligent electric energy meter switching power circuit according to claim 1, it is characterized in that: described load control unit (5) by high-voltage diode (D4), (D5) and (D6), power resistor (R4), inductance (L2) and electric capacity (C2) are formed, the anode of described high-voltage diode (D4), (D5) and (D6) links to each other with resistance (R4) side, described resistance (R4) opposite side links to each other with inductance (L2) side, and described inductance (L2) opposite side links to each other with resistance (R5) side with electric capacity (C2).
6. a kind of three-phase intelligent electric energy meter switching power circuit according to claim 2, it is characterized in that: the other end of the power resistor (R1) in the described distributed weight adjustment device (1), (R2) and (R3) is connected with the hold concurrently anode of filter (2) input side high-voltage diode (D1), (D2), (D3) of halfwave rectifier respectively, and the negative electrode of load control unit (5) outlet side high-voltage diode (D4), (D5), (D6) connects.
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| CN201110190833.5A CN102237809B (en) | 2011-07-08 | 2011-07-08 | A kind of switching power circuit for three-phase intelligent electric energy meter |
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| CN201110190833.5A CN102237809B (en) | 2011-07-08 | 2011-07-08 | A kind of switching power circuit for three-phase intelligent electric energy meter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102539858A (en) * | 2011-12-19 | 2012-07-04 | 深圳市思达仪表有限公司 | Single-phase electric energy meter circuit applying non-isolated switch power supply scheme |
| CN103488912A (en) * | 2013-10-23 | 2014-01-01 | 江苏省计量科学研究院 | Harmonic-factor-based electronic electric energy meter reliability prediction method |
| CN105099227A (en) * | 2014-05-23 | 2015-11-25 | 广东美的暖通设备有限公司 | Three-phase half-wave voltage-doubled rectifying device, motor driving device and air conditioner |
| CN105510705A (en) * | 2015-12-10 | 2016-04-20 | 重庆鸿引电子有限公司 | Multifunctional electric power instrument |
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| CN103488912A (en) * | 2013-10-23 | 2014-01-01 | 江苏省计量科学研究院 | Harmonic-factor-based electronic electric energy meter reliability prediction method |
| CN105099227A (en) * | 2014-05-23 | 2015-11-25 | 广东美的暖通设备有限公司 | Three-phase half-wave voltage-doubled rectifying device, motor driving device and air conditioner |
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| CN105510705A (en) * | 2015-12-10 | 2016-04-20 | 重庆鸿引电子有限公司 | Multifunctional electric power instrument |
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|---|---|
| CN102237809B (en) | 2015-11-18 |
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Address after: 226200 Jiangsu city of Nantong province Qidong Economic Development Zone No. 666 Lin Yang Lu Patentee after: JIANGSU LINYANG ENERGY CO., LTD. Address before: Qidong City, Jiangsu province 226200 Nantong City Economic Development Zone No. 666 Lin Yang Lu Patentee before: Jiangsu Linyang Electronics Co., Ltd. |