CN100588984C - Verification system of electric energy measurement chip - Google Patents
Verification system of electric energy measurement chip Download PDFInfo
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- CN100588984C CN100588984C CN200610160858A CN200610160858A CN100588984C CN 100588984 C CN100588984 C CN 100588984C CN 200610160858 A CN200610160858 A CN 200610160858A CN 200610160858 A CN200610160858 A CN 200610160858A CN 100588984 C CN100588984 C CN 100588984C
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Abstract
The invention discloses an electric energy measuring chip verification system, the sampling differential signals got from current path and voltage path of the electrified wire netting to be measured are received separately by differential amplifier of the current path and voltage path, the signals which are differentially amplified are input to the analogue/digital conversion module of current path and voltage path to generate the digital sampling differential signals which are sent to the FPGA; the digital sampling differential signals of current path and voltage path are abstracted and filedby the FPGA, the results of filtering are multiplied to generate the power data, then the power data is transformed to pulse form and output. The invention resolves the problem of channel coupling generated by the coupling capacitor. Furthermore, the differential amplifier and the analogue/digital conversion module of the current path are connected to a set of separate analog power and ground, the differential amplifier and the analogue/digital conversion module of the voltage path are connected to another set of separate analog power and ground, the invention resolves the problem of couplingfor the sharing of the analog power and ground.
Description
Technical field
The present invention relates to the digit chip verification technique, relate in particular in the electric energy computation chip proof procedure, reduce the verification system of electric energy measurement chip of passage coupling.
Background technology
Along with the development of Power Electronic Technique, electronic electric energy meter has obtained using widely because of it has multi-functional, intelligentized advantage.Electric energy computation chip is the core component of electronic electric energy meter, is undertaking the task of electric energy metrical, and the precision of this chip directly has influence on the measuring accuracy of electric energy meter.
Fig. 1 is the principle schematic of electric energy computation chip.As shown in Figure 1, V_I+ and V_I-are that power network current generates electric current road differential signal through sample resistance, and V_V+ and V_V-are that line voltage is through voltage sampling resistor formation voltage road differential signal; Electric current road differential signal and voltage road differential signal generate electric current road difference amplifying signal and voltage road difference amplifying signal after difference is amplified; This two-way difference amplifying signal generates electric current road and voltage road 1 bit (BIT) code stream after analog to digital conversion; This two-way 1BIT code stream becomes voltage channel parallel data and electric current channel parallel data behind decimation filter; After multiplying each other, two channel parallel datas generate power data; Again with this power data after number conversion frequently, with the impulse form output of certain frequency, the high expression of pulsed frequency output power is big, the low expression of pulsed frequency output power is little; The pulse of output can adopt the outer counter of electric energy computation chip to count, thereby realizes the metering of electric energy.Wherein, the difference amplification in the electric energy computation chip, analog to digital conversion, filtering extraction adopt the two-way module in the chip respectively electric current road and voltage road signal to be handled accordingly when realizing.
With 8 times of tables is example, when fundamental current (IB) is 5A, in 1000: 1 dynamic range, range of current on the electrical network is 40mA～40A, and the scope of voltage is much smaller, usually about 220V ± 20% obtain power because electric current multiplies each other with voltage, as seen the little error of electric current can cause measuring power than mistake.So the electric current that requires this electric energy computation chip current path is usually realized the error less than 0.1% in 1000: 1 dynamic range.The index of producing electric energy computation chip in order to guarantee meets design requirement, especially accuracy requirement, the chip that has digital function as this class of electric energy computation chip all will pass through field programmable logic array (FPLA) (FPGA before operation, Field Programmable Gate Array) checking, verification mode is to adopt to build the difference that circuit reproduces electric energy computation chip and amplify and the analog to digital conversion part, and the filtering extraction of electric energy computation chip, power calculation and number frequency are changed this 3 part and finished by FPGA.
Fig. 2 is the composition frame chart of existing verification system of electric energy measurement chip.Referring to Fig. 2, comprise two differential amplifiers in the double passage differential amplification module 210, a differential amplifier in electric current road sampling differential signal V_I+ and the V_I-input double passage differential amplification module, after difference is amplified, a passage of input double-channel analog/digital modular converter 201; Another differential amplifier in voltage road sampling differential signal V_V+ and the V_V-input double passage differential amplification module 210, after difference is amplified, another passage of input double-channel analog/digital modular converter 201.Double-channel analog/digital modular converter 201 converts the analog quantity electric current road sampling difference amplifying signal that receives to electric current road 1BIT code stream, convert the analog quantity voltage road sampling difference amplifying signal that receives to voltage road 1BIT code stream, and electric current and voltage two-way 1BIT code stream are exported to FPGA230.FPGA230 realizes filtering extraction, multiplier and number translation function frequently, sends frequency pulse and gives counter 105.Wherein, double passage differential amplification module 210 adopts a difference to amplify chip and realizes, has two differential amplifiers at least in this difference amplification chip; Double-channel analog/digital modular converter 201 adopts a modulus conversion chip to realize having two-way analog to digital conversion passage in this modulus conversion chip at least.In addition, double passage differential amplification module 210 and double-channel analog/digital modular converter 201 are all by analog power VDD202 power supply, and these two module earth terminals are connecting system simulation ground VSS203 all.Analog power VDD202 and a shared cover simulation power supply and the ground of simulation ground VSS203, analog power and ground are provided by external direct current power supply.
As seen from the above technical solution, in the verification system of electric energy computation chip,, electric current and voltage signal amplify because carrying out difference in same difference amplification module, and carry out analog to digital conversion in same analog-to-digital conversion module, interchannel coupling capacitance causes the generation of signalling channel coupling in the same module; Passage also can produce the passage coupling by shared analog power and ground simultaneously.For the very high electric energy metrical of accuracy requirement, voltage can cause occurring bigger error in dipping to the coupling of current path, particularly under the situation of tens milliamperes of little electric currents, voltage channel is quite serious to the coupling of current channel, causes measurement result can not satisfy in the electric energy computation chip design 0.1% error precision requirement.After in FPGA230 current data and voltage data being multiplied each other, power data that obtains and True Data differ bigger.The deficiency of therefore existing verification system of electric energy measurement chip just is to have coupling between the voltage and current path in difference amplification and the analog-to-digital conversion module, causes the measurement result precision of verification system of electric energy measurement chip can not reach designing requirement.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of verification system of electric energy measurement chip, can greatly reduce the interchannel coupling.
In order to reach described goal of the invention, the invention provides a kind of verification system of electric energy measurement chip, this system comprises electric current road difference amplification module, voltage road difference amplification module, electric current road analog-to-digital conversion module, voltage road analog-to-digital conversion module and field programmable logic array (FPLA) FPGA;
Described electric current road difference amplification module is used to receive the electric current road sampling differential signal of taking from tested electrical network, after difference is amplified, generates electric current road sampling difference amplifying signal, input current road analog-to-digital conversion module;
Described electric current road analog-to-digital conversion module is used for the electric current road sampling difference amplifying signal that received current road difference amplification module is exported, and generates digital quantity electric current road sampled signal, input FPGA;
Described voltage road difference amplification module is used to receive the voltage road sampling differential signal of taking from tested electrical network, after difference is amplified, and formation voltage road sampling difference amplifying signal, input voltage road analog-to-digital conversion module;
Described voltage road analog-to-digital conversion module is used to receive the voltage road sampling difference amplifying signal that voltage road difference amplification module is exported, and generates digital quantity voltage road sampled signal, input FPGA;
Described FPGA, be used for the digital quantity electric current road sampled signal of received current road analog-to-digital conversion module output and the digital quantity voltage road sampled signal of voltage road analog-to-digital conversion module output, after respectively this two paths of signals being carried out filtering extraction, the result multiplies each other with filtering, generate power data, and convert power data to impulse form output.
Wherein, described electric current road analog-to-digital conversion module is the single channel analog-to-digital conversion module; Described voltage road analog-to-digital conversion module is the single channel analog-to-digital conversion module.
Described electric current road difference amplification module is a single channel difference amplification module; Described voltage road difference amplification module is a single channel difference amplification module.
Described electric current road difference amplification module and electric current road analog-to-digital conversion module are powered by first analog power, and provide with reference to earth potential by first with simulating; Described voltage road difference amplification module and voltage road analog-to-digital conversion module are powered by second analog power, and provide with reference to earth potential by second with simulating;
Between described first simulation ground and the described second simulation ground is same as earth potential.
Preferable, described first analog power inserts the power end of external first direct supply, and the described first simulation ground inserts the earth terminal of described external first direct supply;
Described second analog power inserts the power end of external second direct supply, and the described second simulation ground inserts the earth terminal of described external second direct supply;
The earth terminal of the earth terminal of described external first direct supply and described external second direct supply altogether.
Preferable, described first analog power and described second analog power insert the power end of same external direct current power supply; Described first simulation ground and the described second simulation ground insert the earth terminal of described same external direct current power supply.
Wherein, described first analog power and described second analog power insert the power end of same external direct current power supply respectively by magnetic bead;
Described first simulation ground and the described second simulation ground insert the earth terminal of described same external direct current power supply respectively by magnetic bead.
The present invention adopts two single channel difference amplification modules and two single channel analog-to-digital conversion modules respectively electric current and voltage signal to be handled in the verification system of electric energy computation chip.Because coupling capacitance and interchannel distance are inversely proportional to, so the increase of distance makes the interchannel coupling capacitance reduce between electric current and voltage channel, can reduce to the degree of almost ignoring, and has solved the passage coupled problem that interchannel causes because of coupling capacitance.In addition, the present invention overlaps independently analog power and ground with the difference amplification module and the analog-to-digital conversion module access one on electric current road, the difference amplification module and the analog-to-digital conversion module on voltage road are inserted another set of independently analog power and ground, therefore, two passages can drop to the degree of ignoring by the coupling that power supply and ground produce in the same module, have solved the coupled problem that interchannel produces owing to common analog power supply and ground.The present invention compares with existing electric quantity metering chip checking system, has only increased an analog-to-digital conversion module and a cover simulation power supply and ground, implements comparatively simply, and cost is less.
Description of drawings
Fig. 1 is the principle schematic of electric energy computation chip.
Fig. 2 is the composition frame chart of existing verification system of electric energy measurement chip.
Fig. 3 is the composition frame chart of verification system of electric energy measurement chip of the present invention.
Fig. 4 is the principle schematic of first kind of power supply power supply of verification system of electric energy measurement chip of the present invention.
Fig. 5 is the principle schematic of second kind of power supply power supply of verification system of electric energy measurement chip of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
Core concept of the present invention is to adopt two difference amplification modules in verification system of electric energy measurement chip, respectively electric current, voltage sampling signal is carried out difference and amplifies; Simultaneously, adopt two analog-to-digital conversion modules, respectively electric current, voltage sampling signal are carried out analog to digital conversion, solved the passage coupled problem that interchannel causes because of coupling capacitance.
Wherein, two difference amplification modules adopt two chips that can realize that difference is amplified to realize respectively, and two analog-to-digital conversion modules adopt two can realize analog-to-digital chip realization respectively.
As shown in Figure 3, Fig. 3 is the composition frame chart of verification system of electric energy measurement chip of the present invention.Be with the difference of existing verification system of electric energy measurement chip shown in Figure 2, the verification system of electric energy measurement chip 300 of Fig. 3 adopt two independently single channel difference amplification module respectively electric current and voltage are carried out difference and amplify; Also adopt in addition two independently the single channel analog-to-digital conversion module respectively electric current and voltage are carried out analog to digital conversion.The distance of voltage and current passage increases, and the interchannel coupling capacitance reduces, and can reduce to the degree of almost ignoring.
Wherein, verification system of electric energy measurement chip 300 comprises single channel difference amplification module 321, single channel difference amplification module 322, single channel analog-to-digital conversion module 301, single channel analog-to-digital conversion module 311 and FPGA330.
Single channel difference amplification module 321,322 and single channel analog-to-digital conversion module the 301, the 311st enter the circuit of handling before the FPGA330 to power network current road and voltage road sampled signal.Single channel difference amplification module adopts the difference that contains a differential amplifier to amplify chip and realizes, the single channel analog-to-digital conversion module adopts the modulus conversion chip that contains one tunnel analog to digital conversion passage to realize.Certainly, above-mentioned single channel chip also can adopt multi-channel chip, but needs to adopt two multi-channel chips respectively the signal on electric current road and voltage road to be handled.
Two input ends of single channel difference amplification module 321 are connected to the two ends of the sample resistance 103 that seals on the electrical network zero line 102, receive electric current road sampling differential signal V_I+ and the V_I-of power network current through sample resistance 103 generations, V_I+ and V_I-are after difference is amplified, and output current road sampling difference amplifying signal is given single channel analog-to-digital conversion module 301.
Single channel analog-to-digital conversion module 301 is used for analog quantity electric current road sampled signal is converted to digital quantity.This module receives the electric current road sampling difference amplifying signal of single channel difference amplification module 321 outputs, converts thereof into electric current road 1BIT code stream, and promptly digital quantity electric current road sampled signal is exported to FPGA330.
Two input ends of single channel difference amplification module 322 are connected to the dividing potential drop output terminal of the divider resistance 104 that is connected into electrical network, receive line voltage through divider resistance 104 voltage after partial roads sampling differential signal V_V+ and V_V-.V_V+ and V_V-are after the difference of single channel difference amplification module 322 is amplified, and output voltage road sampling difference amplifying signal is given single channel analog-to-digital conversion module 311.
Single channel analog-to-digital conversion module 311 receives the voltage road sampling difference amplifying signal of single channel difference amplification module 322 outputs, converts thereof into voltage road 1BIT code stream, and promptly digital quantity voltage road sampled signal is exported to FPGA330.
FPGA330 is used for realizing electric current computation chip filtering extraction, multiplier and the number function of conversion frequently.FPGA330 receives electric current road and the voltage road 1BIT code stream that single channel analog-to- digital conversion module 301 and 311 is sent here, behind this two-way 1BIT signal bit stream filtering extraction, its result is multiplied each other, and product is converted to the frequency signal of impulse form.The pulse signal that to represent power is at last counted by external counter 105 from verification system of electric energy measurement chip 300 outputs, thereby realizes the metering of electric energy.
In order further to reduce interchannel coupling, the present invention overlaps independently analog power and ground with single channel difference amplification module 322 and 311 accesses one of single channel analog-to-digital conversion module; Single channel difference amplification module 321 and single channel analog-to-digital conversion module 301 are inserted another set of independently analog power and ground.Therefore, when no matter difference is amplified or during analog to digital conversion, electric current and voltage path just can drop to the degree of ignoring by the coupling on analog power and ground.As shown in Figure 3, single channel difference amplification module 321 and single channel analog-to-digital conversion module 301 are by analog power VDD302 power supply, and the earth terminal of two modules inserts the simulation ground VSS303 of verification system of electric energy measurement chip 300.Single channel difference amplification module 322 and single channel analog-to-digital conversion module 311 adopt another set of independently analog power and ground, and these two modules are by analog power VDD312 power supply, and the earth terminal of module inserts the simulation ground VSS313 of verification system of electric energy measurement chip 300.Between simulation ground VSS303 and the VSS313 is same as earth potential, promptly need be outside verification system of electric energy measurement chip 300 altogether.
Two of verification system of electric energy measurement chip 300 overlaps independently, and analog power is provided by external direct current power supply with simulation ground.In actual applications, this two covers simulation power supply and ground can be provided respectively by two cover external direct current power supplies.As shown in Figure 4, comprise two cover direct supplys and ground in the external direct current power supply 400, be respectively power vd D402 and reference ground VSS403, and power vd D412 and reference ground VSS413.This two the cover direct supply and ground be respectively verification system of electric energy measurement chip 300 provide current path and voltage path analog power and.Wherein, VDD402 inserts the VDD302 of verification system of electric energy measurement chip 300, and VSS403 inserts VSS303; VDD412 inserts the VDD312 of verification system of electric energy measurement chip 300, and VSS413 inserts VSS313; VSS403 links to each other with VSS413, and inserts samely as earth potential, so VSS303 has just obtained identical reference earth potential with VSS313.
In order to save resource, also can adopt a cover external direct current power supply is verification system of electric energy measurement chip 300 power supplies.As shown in Figure 5, comprise a cover direct supply and ground in the external direct current power supply 500, for power vd D502 with reference to ground VSS503.VDD502 is by the VDD302 of magnetic bead access verification system of electric energy measurement chip 300, and VDD502 inserts the VDD312 of verification system of electric energy measurement chip 300 by another magnetic bead simultaneously; VSS503 is by the VSS303 of magnetic bead access verification system of electric energy measurement chip 300, and VSS503 inserts the VSS313 of verification system of electric energy measurement chip 300 by another magnetic bead simultaneously.VSS503 inserts one with reference to earth potential, so VSS303 has just obtained identical reference earth potential with VSS313.
By the above as can be seen, adopt verification system of electric energy measurement chip of the present invention, solved the voltage and current interchannel, solved the passage coupled problem that produces owing to common analog power supply and ground simultaneously because of the passage coupled problem that coupling capacitance causes.And comparing with existing verification system of electric energy measurement chip has only increased a difference amplification module, analog-to-digital conversion module and a cover simulation power supply and a ground, realizes comparatively simply, and cost is less.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1, a kind of verification system of electric energy measurement chip is characterized in that, this system comprises electric current road difference amplification module, voltage road difference amplification module, electric current road analog-to-digital conversion module, voltage road analog-to-digital conversion module and field programmable logic array (FPLA) FPGA;
Described electric current road difference amplification module is used to receive the electric current road sampling differential signal of taking from tested electrical network, after difference is amplified, generates electric current road sampling difference amplifying signal, input current road analog-to-digital conversion module;
Described electric current road analog-to-digital conversion module is used for the electric current road sampling difference amplifying signal that received current road difference amplification module is exported, and generates digital quantity electric current road sampled signal, input FPGA;
Described voltage road difference amplification module is used to receive the voltage road sampling differential signal of taking from tested electrical network, after difference is amplified, and formation voltage road sampling difference amplifying signal, input voltage road analog-to-digital conversion module;
Described voltage road analog-to-digital conversion module is used to receive the voltage road sampling difference amplifying signal that voltage road difference amplification module is exported, and generates digital quantity voltage road sampled signal, input FPGA;
Described FPGA, be used for the digital quantity electric current road sampled signal of received current road analog-to-digital conversion module output and the digital quantity voltage road sampled signal of voltage road analog-to-digital conversion module output, after respectively this two paths of signals being carried out filtering extraction, the result multiplies each other with filtering, generate power data, and convert power data to impulse form output;
Described electric current road difference amplification module and electric current road analog-to-digital conversion module are powered by first analog power, and provide with reference to earth potential by first with simulating; Described voltage road difference amplification module and voltage road analog-to-digital conversion module are powered by second analog power, and provide with reference to earth potential by second with simulating;
Between described first simulation ground and the described second simulation ground is same as earth potential.
2, verification system according to claim 1 is characterized in that, described electric current road analog-to-digital conversion module is the single channel analog-to-digital conversion module; Described voltage road analog-to-digital conversion module is the single channel analog-to-digital conversion module;
Described electric current road difference amplification module is a single channel difference amplification module; Described voltage road difference amplification module is a single channel difference amplification module.
3, verification system according to claim 1 is characterized in that, described first analog power inserts the power end of external first direct supply, and the described first simulation ground inserts the earth terminal of described external first direct supply;
Described second analog power inserts the power end of external second direct supply, and the described second simulation ground inserts the earth terminal of described external second direct supply;
The earth terminal of the earth terminal of described external first direct supply and described external second direct supply altogether.
4, verification system according to claim 1 is characterized in that, described first analog power and described second analog power insert the power end of same external direct current power supply; Described first simulation ground and the described second simulation ground insert the earth terminal of described same external direct current power supply.
5, verification system according to claim 4 is characterized in that, described first analog power and described second analog power insert the power end of same external direct current power supply respectively by magnetic bead;
Described first simulation ground and the described second simulation ground insert the earth terminal of described same external direct current power supply respectively by magnetic bead.
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| CN200610160858A CN100588984C (en) | 2006-11-30 | 2006-11-30 | Verification system of electric energy measurement chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102707140A (en) * | 2012-06-05 | 2012-10-03 | 广州市香港科大霍英东研究院 | Energy consumption real-time monitoring method for nodes of wireless sensor network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565528B (en) * | 2012-03-13 | 2014-04-16 | 钜泉光电科技(上海)股份有限公司 | Electric energy meter |
| CN103353558B (en) * | 2013-05-31 | 2016-12-28 | 深圳市康必达控制技术有限公司 | A kind of electric energy quality monitoring method |
| CN107436380B (en) * | 2016-05-27 | 2023-12-15 | 上海贝岭股份有限公司 | Method and device for generating electric energy pulse |
| CN116008655A (en) * | 2023-02-13 | 2023-04-25 | 山东省计量科学研究院 | Electric energy metering device for measuring bidirectional DC converter |
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