CN205157761U - Detection device for direct current electric energy meter - Google Patents
Detection device for direct current electric energy meter Download PDFInfo
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- CN205157761U CN205157761U CN201520934180.0U CN201520934180U CN205157761U CN 205157761 U CN205157761 U CN 205157761U CN 201520934180 U CN201520934180 U CN 201520934180U CN 205157761 U CN205157761 U CN 205157761U
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Abstract
The utility model provides a detection device for direct current electric energy meter, including standard direct current table module, the programme -controlled source module of DC voltage, the programme -controlled source module of direct current and system control module, system control module inputs the voltage that detects and current signal respectively in programme -controlled source module of DC voltage and the programme -controlled source module of direct current, programme -controlled source module of DC voltage and the programme -controlled source module of direct current are measured and are measured according to the voltage and the current signal of input to output direct current voltage standard source and direct current standard source, be provided with voltage output end measurement circuit between standard direct current table module and the direct current voltage standard source follower end, be provided with current output terminal measurement circuit between standard direct current table module and the direct current standard source output. It can show to carry out the witnessed inspections to the direct current, has improved the efficiency and the security that detect.
Description
Technical field
The utility model relates to electric energy meter detection field, particularly a kind of direct-current electric energy meter calibrating device.
Background technology
Electric automobile industry is the whole world the most popular current development industry, and the BYD E series from the tesla of the U.S. to China, the serial vehicle of the Qin all push market, and obtain good market reaction.According to " automobile and new-energy automobile industrial development planning " that national Ministry of Industry and Information releases, to the year two thousand twenty, China's new-energy automobile recoverable amount reaches 5,000,000, is that the energy-saving automobile of representative reaches more than 1,500 ten thousand with hybrid vehicle.
For the DC measurement device of charging electric vehicle, each producer develops Related product in succession, and the electric energy meter manufacturing enterprise as represented with wasion, section Lu Wei have developed the measuring apparatus being exclusively used in electric automobile DC charging, and hanging net operation.On the other hand, multiple gauge check research institution has developed high-grade direct current energy meter standard and has carried out laboratory verification to electric automobile DC charging measuring apparatus.Corresponding examination criteria and technical manual are also constantly put into effect, such as: require that DC charging measuring apparatus is made up of direct current energy meter, direct current resistance voltage divider, direct current shunt in Guo Wang incorporated business standard Q/GDW11165-2014 " technical requirement of electric automobile non-Vehicular charger DC measurement ", relevant calibration operation also launches as target; National metrological verification regulations JJG842-1993 " direct current energy meter ", JJG513-2003 " d.c.resistor volt ratio box ", JJG1069-2003 " direct current shunt " have made specific requirement to the calibrating of DC charging measuring apparatus.
In patent publication No. be: CN102062849A, patent name is: in the patent documentation of a kind of direct-current electric energy meter calibrating device and method, disclose a kind of direct-current electric energy meter calibrating device, comprise human-computer interaction interface, main control module, voltage power amplifier module, current amplification module, voltage measurement module, current measurement module, energy calculate module, full sized pules output interface and tested Puled input interface; Described human-computer interaction interface is connected with described main control module, and described main control module is connected to described electric energy metering module by described voltage power amplifier module, voltage measurement module successively by control bus; Described main control module is connected to described electric energy metering module by described current amplification module, current measurement module successively by control bus; Described energy calculate module is connected with described full sized pules output interface and tested Puled input interface respectively; Described voltage power amplifier module is provided with the interface be connected with the voltage signal of tested electric energy meter, and described current amplification module is provided with the interface be connected with the current signal of tested electric energy meter.During work for tested table, need it to unload from working site, be then placed in calibrating checking table and just can complete calibrating, the on-site proving to tested table cannot be realized.Therefore be necessary to develop a kind of device for on-site calibration, be convenient to carrying out of measuring apparatus periodic calibration work.
Summary of the invention
The technical problems to be solved in the utility model is: provide a kind of direct-current electric energy meter calibrating device, and it can carry out Site Detection to direct current energy meter, improves efficiency and the security of detection.
Solution of the present utility model is achieved in that a kind of direct-current electric energy meter calibrating device, comprise standard direct current table module, the program control source module of DC voltage, the program control source module of DC current and system control module, the voltage and current signal of detection is input in the program control source module of DC voltage and the program control source module of DC current by described system control module respectively, the program control source module of described DC voltage and the program control source module of DC current carry out measuring and measuring according to the voltage and current signal of input, and export DC voltage standard and DC current standard source, voltage output end measuring circuit is provided with between described standard direct current table module and DC voltage standard output terminal, current output terminal measuring circuit is provided with between described standard direct current table module and DC current standard source output terminal.
Another technical scheme of the present utility model is on above-mentioned basis, the program control source module of described DC voltage comprises voltage signal source module, difference adjustment module and voltage power amplifier standard source module, the voltage signal of described system control module is sent to after difference adjustment module and voltage power amplifier standard source resume module through voltage signal source module successively, exported by DC voltage standard output terminal, between described DC voltage standard output terminal and described difference adjustment module, be provided with voltage measurement negative feedback loop.
Another technical scheme of the present utility model is on above-mentioned basis, and described voltage signal source module is controllable sine wave, distorted wave voltage signal source based on digital signal processor DSP and high-speed A/D converter composition.
Another technical scheme of the present utility model is on above-mentioned basis, described voltage power amplifier standard source module comprises PWM controller, output transformer, current rectifying and wave filtering circuit and sampling feedback circuit, the input signal of described voltage power amplifier standard source module is after PWM controller process, be input to output transformer and carry out transformation process, export after current rectifying and wave filtering circuit process again, and feed back to PWM controller at output terminal by sampling feedback circuit sampling.
Another technical scheme of the present utility model is on above-mentioned basis, the program control source module of described DC current comprises current signal source module, difference adjustment module and current amplification standard source module, the current signal of described system control module is sent to after difference adjustment module and current amplification standard source resume module through current signal source module successively, exported by DC current standard source output terminal, between described DC current standard source output terminal and described difference adjustment module, be provided with current measurement negative feedback loop.
Another technical scheme of the present utility model is on above-mentioned basis, described current signal source module be based on digital signal processor DSP and high-speed A/D converter composition controllable sine wave, distorted wave current signal source.
Another technical scheme of the present utility model is on above-mentioned basis, described current amplification standard source module comprises power amplifier, light-coupled isolation module, direct current instrument transformer module and large power supply generative circuit, the input signal of described current amplification standard source module carries out after amplifier through power amplifier, carry out light-coupled isolation by light-coupled isolation module, then carry out power amplification through direct current instrument transformer module and carry out the stable current source of coupling output with large power supply generative circuit.
Another technical scheme of the present utility model is on above-mentioned basis, module is there is in described current amplification standard source module for simulation shunt exports mV, simulation shunt exports mV generation module and comprises power amplifier driving circuit, triode and feedback circuit, described simulation shunt exports mV and the input signal of module occurs for simulation small voltage amount, input signal controls the input impedance of triode by power amplifier driving circuit, feedback circuit obtains voltage signal based on electric resistance partial pressure mode, realizes the dynamic adjustments to output voltage.
Another technical scheme of the present utility model is on above-mentioned basis, described direct current instrument transformer module comprises square wave excitation module, Signal-regulated kinase and power amplifier module, described square wave excitation module by signal acts on high permeability iron-core coil, by measuring resistance ground connection after Signal-regulated kinase and power amplifier module process.
Another technical scheme of the present utility model is on above-mentioned basis, described Signal-regulated kinase comprises bandpass filter, detecting circuit, low-pass filter and DC amplification circuit, first-harmonic in described bandpass filter removal detection signal and other subharmonic compositions, even-order harmonic is amplified independent, demodulate amplitude and the phase place of even harmonics signal again through detecting circuit, produce through low-pass filtering and amplification the DC current be directly proportional.
Compared with prior art, the advantage of direct-current electric energy meter calibrating device described in the utility model is: described direct-current electric energy meter calibrating device, comprise standard direct current table module, the program control source module of DC voltage and the program control source module of DC current, and voltage output end measuring circuit is provided with between standard direct current table module and DC voltage standard output terminal, current output terminal measuring circuit is provided with between standard direct current table module and DC current standard source output terminal, be integrated in one by direct current power source and standard direct current table module, achieve and Site Detection is carried out to direct current energy meter, improve efficiency and the security of detection.In addition, direct-current electric energy meter calibrating device counts electric current, voltage module connection in series-parallel to realize dosage and error checking by external circuit and tested showing.And the sensor output signal of direct-current electric energy meter calibrating device delivers to the program control source module of DC voltage and the program control source module of DC current, for measurement and the metering of electric current, voltage; And then deliver to difference adjustment module, carry out negative feedback control for the electric current to the program control source module of DC voltage and the program control source module output of DC current, voltage, make real output value consistent with setting value.
Accompanying drawing explanation
The accompanying drawing forming a part of the present utility model is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.
Fig. 1 is the theory diagram of direct-current electric energy meter calibrating device described in the utility model;
Fig. 2 is the schematic diagram of voltage power amplifier standard source in direct-current electric energy meter calibrating device shown in Fig. 1;
Fig. 3 is the schematic diagram of current amplification standard source in direct-current electric energy meter calibrating device shown in Fig. 1;
Fig. 4 is the schematic diagram of a kind of embodiment of the standard source of current amplification shown in Fig. 3;
Fig. 5 is the schematic diagram of the module of direct current instrument transformer shown in Fig. 3;
The Symmetrical square-wave current waveform figure that Fig. 6 produces for the module of square wave excitation shown in Fig. 5;
The symmetric square-wave current waveform figure of forfeiture that Fig. 7 produces for the module of square wave excitation shown in Fig. 5.
Embodiment
Be described in detail the utility model below in conjunction with accompanying drawing, the description of this part is only exemplary and explanatory, should not have any restriction to protection domain of the present utility model.In addition, those skilled in the art, according to the description of presents, can carry out respective combination to the feature in embodiment in presents and in different embodiment.
Direct-current electric energy meter calibrating device described in the utility model, adopts following technical scheme to realize:
1) by principle of work that direct current power source and standard direct current table module are integrated in one
Direct current power source and standard direct current table module are integrated in one, wherein direct current power source is made up of voltage source and current source.Compared with prior art, the inside of described direct-current electric energy meter calibrating device is provided with voltage output end measuring circuit and current output terminal measuring circuit, this circuit is embedded in voltage power amplifier and current amplification respectively, be integrated with power amplifier, be integrated in one by direct current power source and standard direct current table module.Described direct-current electric energy meter calibrating device counts electric current, voltage module connection in series-parallel to realize dosage and error checking by external circuit and tested showing.The power measurement module of described direct-current electric energy meter calibrating device and energy supply control module adopt same set of sensor, and current measurement is based on Zero flux measuring technique, and voltage measurement is based on precision resistance voltage divider techniques.Sensor output signal is delivered to voltage and current signal and is input in the program control source module of DC voltage and the program control source module of DC current respectively, the program control source module of described DC voltage and the program control source module of DC current carry out measuring and measuring according to the voltage and current signal of input, and export DC voltage standard and DC current standard source, be provided with voltage output end measuring circuit between described standard direct current table module and DC voltage standard output terminal, between described standard direct current table module and DC current standard source output terminal, be provided with current output terminal measuring circuit.
2) based on the signal source that digital signal processor DSP and high-speed A/D converter form
Signal source is divided into voltage signal source module and current signal source module, and realizing circuit is completely the same.Signal source adopts 32 bit DSPs and 16 high-speed A/D converters to form controllable sine wave, distorted wave signal source, under DSP and adjustable clock control circui, by waveform synthetic circuit output digit signals, after D/A conversion, low-pass filtering, obtain the analog DC voltage with certain amplitude, the current signal of continuous low distortion.It is 5V that signal source exports DC voltage, and amplitude fineness adjustment is 5 × 10
-5.The feature of this signal source is: adopt arithmetic speed and all very high DSP of operation efficiency to replace single-chip microcomputer, realize the total value compute mode of random waveform, random waveform can be obtained easily, realized by 16 high-speed A/D converters (also known as D/A), conversion ultimate resolution: 200uV.
3) difference adjustment module, power amplifier standard source module, measurement module
Effect: the signal that signal source occurs realizes power amplification through difference adjustment module, power amplifier standard source module, produces the final each range electric current and voltage adapted with tested direct current energy meter.
Power standard source module is divided into voltage power amplifier standard source module and current amplification standard source module two parts
3.1) voltage power amplifier standard source module
Adopt PWM pulse length modulation principle, comprise PWM controller, output transformer, current rectifying and wave filtering circuit, sampling feedback circuit.The output control procedure of voltage combines profound and negative feedbck technology and difference regulation technology, is combined carry out power amplification and the stable voltage source of coupling output by power amplifier and output transformer.Inside is equipped with voltage output end measuring circuit, and this circuit is embedded in voltage power amplifier, is integrated with power amplifier.
Voltage output end measuring circuit measures sampling value U2, U2 feeds back to power generation module and voltage difference adjustment module, the measured value U2 and the user setting value U1 that enter difference adjustment module compare, the difference compared according to both regulates the output valve of actual source, consistent with setting value to ensure the output valve moment in source, ensure that the load regulation in source controls within ± 0.01%RG (load is from zero load to fully loaded).Such as, when signal source is input as zero, internal oscillator combination produces square wave, exports null value through output transformer, current rectifying and wave filtering circuit, sample resistance; When signal source has an input, after input voltage conditioning and square-wave frequency modulation, modulation waveform pulsewidth is directly proportional to input signal source, then through output transformer, current rectifying and wave filtering circuit output.Output terminal adopts four line modes, takes out magnitude of voltage through sampling negative-feedback circuit to input end, compares Formation Depth negative feedback enter PWM controller again and form overall closed loop with input.By resistance, capacitance network composition filter network.The action of four relays is for selecting four output ranges, and voltage power amplifier design range is 100V, 350V, 500V, 700V, allows each range maximum overshoot 120%, and ultimate design is 840V, degree of stability: 0.01%/2min.
3.2) current amplification standard source module
Use DC current transformer, in conjunction with profound and negative feedbck technology and difference regulation technology.Signal source carries out power amplification and the stable current source of coupling output through amplifier, light-coupled isolation, direct current instrument transformer combination.Inside is equipped with current output terminal measuring circuit and measures sampling value I2, I2 feeds back to power generation module and current differential adjustment module, the measured value I2 and the user setting value I1 that enter current differential adjustment module compare, the difference compared according to both regulates the output valve of actual source, consistent with setting value to ensure the output valve moment in source, ensure that the load regulation in source controls within ± 0.01%RG (load is from zero load to fully loaded).Measuring circuit is embedded in current amplification, is integrated with power amplifier, by magnetic flux feedback Principles of Regulation, makes controlled DC current and measured DC be fixed proportion relation and flow direction is contrary, thus measures DC current size and Orientation.
Current amplification standard source module can be divided into " simulation shunt exports mV and module occurs " and " rated current generation module ".There is module and export for simulating shunt in mV, specified 75mV small voltage signal can occur, can examine the electric energy meter being with external shunt.Electric current generation module produces each range DC current, and design current range is: 2A, 20A, 50A, 100A, allows each range maximum overshoot 120%, and ultimate design is 120A, degree of stability: 0.01%/2min.
4) calibration power table module, electric energy frequency translation module
Be embedded in the electric current in power amplifier standard source, voltage sensor and dsp chip composition calibration power table module, measurement value is exported to dsp chip and is carried out multiplication calculating by sensor, and then obtains DC power P.Electric energy frequency translation module occurs to export pulse according to DC power value size, and this pulsed frequency becomes fixed proportion with power P value size.The specified output frequency 20000Hz of pulse, corresponding nominal DC power; The highest output frequency 24000Hz of pulse, 120% of corresponding output rating is 20000Hz during corresponding rated power.Such as: voltage output range is 100V, current output journey is 2A, when rated power exports as 200W, and pulse output frequencies 20000Hz.The degree of stability in program control source is very high, can think dummy load power constant, thus guarantees to detect the error of tested electric energy meter with " watt-second method ".
Embodiment of the present utility model is specific as follows, refers to Fig. 1, is the theory diagram of direct-current electric energy meter calibrating device described in utility model.
1) CPU sends range control signal and output quantity value signal, respectively corresponding voltage power amplifier standard source and DSP/ digital to analog converter signal source, determines the size exporting value in digital field.DSP/ digital to analog converter signal source by small value analog output to difference adjustment module, the value that reduces of measuring amount is exported to difference adjustment module by voltage/current measurement module, and two minute analog values are by exporting to after subtraction to voltage/current power amplifier standard source.The output quantity of voltage/current measurement module becomes fixed proportion with voltage/current power amplifier standard source output quantity, and the output quantity of difference adjustment module becomes fixed proportion with power amplifier standard source output quantity.The FEEDBACK CONTROL of said process and voltage/current source and regulation mechanism.Signal source adopts 32 bit DSPs and 16 high-speed A/D converters to form controllable waveform signal source, under DSP and adjustable clock control circui, by waveform synthetic circuit output digit signals, after D/A conversion, low-pass filtering, obtain the analog DC voltage with certain amplitude, the current signal of continuous low distortion.
2) the standard source output valve of voltage/current measurement module is except for FEEDBACK CONTROL and adjustment, also has other function.The standard source output valve second tunnel output quantity of voltage/current measurement module gives power generation module, calculates DC power size, direction by the relation of voltage, electric current and power.Power generation module is made up of high-accuracy voltage/current sensor, high-speed AD converter, dsp chip and peripheral circuit, and the digital signal feeding dsp chip analog value that measurement module exports being become corresponding relation calculates.
3) performance number that power generation module calculates exports pulse F through electric energy frequency translation module, and the frequency of F becomes fixed proportion relation with power.Pulse rated frequency is 20000Hz, corresponding rated power, highest frequency 24000Hz, corresponding 120% rated power.Because frequency values can be synchronized with setting value all the time in whole loading range, therefore think that setting value can reflect output actual conditions in real time.
In addition, as shown in Figure 2, be the schematic diagram of voltage power amplifier standard source in described direct-current electric energy meter calibrating device.Wherein, voltage occurs to adopt PWM pulse length modulation principle, and voltage power amplifier standard source is made up of PWM controller, output transformer, current rectifying and wave filtering circuit, sampling feedback circuit.PWM controller acknowledge(ment) signal source and the control of measuring value of feedback.Voltage output end measures sampling value U2, U2 feeds back to PWM controller, and compare with user setting value U1, the difference compared according to both regulates the output valve of actual source, consistent with setting value to ensure the output valve moment in source, ensure that the load regulation in source controls within ± 0.01%RG (load is from zero load to fully loaded).
PWM controller is inner produces square wave with oscillator.When controller signals source is not 0, this signal produces the square-wave signal with certain dutycycle with standard block signal madulation after conditioning, and dutycycle is directly proportional to input signal source.Export through output transformer, current rectifying and wave filtering circuit, output terminal adopts four line modes again.Take out magnitude of voltage through sampling negative-feedback circuit to input end, compare Formation Depth negative feedback with input and enter PWM controller again and form overall closed loop .R18-R21 and form filter network in conjunction with C18-C21, four output ranges selected respectively by J1-J4 relay.
As shown in Figure 3, be current amplification standard source schematic diagram in described direct-current electric energy meter calibrating device.Wherein, DC current is produced by large power supply generative circuit, current return series connection high-power FET T1 and direct current instrument transformer, exports through current-limiting resistance and measurement range selection relay.The controlled stage input voltage of field effect transistor T1 is provided by power amplifier, the size of signal generating source output and direct current instrument transformer feedback signal joint effect power amplifier output voltage.Field effect transistor controlled stage power amplifier exports control voltage according to Setting signal, current return electric current is made to increase, direct current instrument transformer detects that the large young pathbreaker's measuring-signal of DC current is sent into feedback circuit and compares with Setting signal, relatively difference is as power amplifier Drazin inverse amount, realizes the dynamic adjustments to DC current size.Output range has four, is respectively 2A, 20A, 50A, 100A, the current-limiting resistance that correspondence four is different, by the turn-on and turn-off in each range loop of Control.In this circuit, T1 is multiple high-power FET parallel-connection structures, and rated current is 110A, power supply 55V, and large power supply generative circuit provides 3.3V power supply.
As shown in Figure 4, be the schematic diagram of a kind of embodiment of described current amplification standard source, that concrete is simulation shunt mV generation module principle figure.Wherein, the electric current link through the direct current energy meter of shunt access is sampled as specified 75mV voltage signal, and therefore calibrating installation also can be simulated shunt and be provided mV magnitude voltage signals.
MV voltage generation module realizes with difference ratio amplification principle, and input signal is simulation small voltage amount, is controlled the input impedance of triode, obtained the d. c. voltage signal of proportional amplification further by resistance pressure-dividing network by power amplifier driving circuit.Owing to using difference proportional amplifier, the temperature of output voltage is waftd very little, has excellent common-mode rejection ratio.Feedback circuit obtains voltage signal based on electric resistance partial pressure mode, realizes the dynamic adjustments to output voltage.The precision of this mV voltage generation module is ensured by the input impedance of power amplifier driving circuit and the electric resistance partial pressure ratio of feedback circuit.
As shown in Figure 5, be described direct current instrument transformer module principle figure.It adopts closed loop Zero-flux sensing principle, utilizes the nonlinear characteristic of high permeability iron core under square wave excitation to detect the change of Weak magentic-field.Coil N3 is drive coil, and N2 is magnetic test coil.When coil N3 passes to the square wave current of alternation symmetry, magnetic core will be repeatedly saturated, if primary current (namely the tested electric current of direct current) I1=0, on magnetic test coil N2, so just can occur the square-wave waveform of positive negative peak symmetry, as shown in Figure 6.If former limit N1 has I1 to pass through, then can add new DC bias magnetic field, produce magnetic modulation, make square wave generation phase offset in magnetic test coil N2, the symmetry of square wave is destroyed, and has occurred even-order harmonic in the frequency spectrum of waveform, loses symmetric square-wave waveform figure as shown in Figure 7.The amplitude of even-order harmonic and polarity can reflect the size and Orientation of the tested electric current of direct current.Utilize this principle, even-order harmonic is amplified, modulate, and then produce secondary DC current I2, offsetting the magnetic bias impact that I1 produces magnetic core, realizing the object of brief introduction measurement I1 by measuring I2 value.
In order to not allow periodic drive current enter to former marginal not conversely, have employed bimag structure, excitation winding N3 is split into two halves, respectively differential concatenation coiling, around on the contrary, and equal turn numbers.In actual coiling, magnetic test coil N2 is wound on innermost layer, primary coil N1 is around outermost layer, and midfeather copper shield and magnetic core shield.Square wave excitation source LM555 circuit realiration, produces Symmetrical square wave current, makes magnetic core be in state of saturation.Now electric current as shown in Figure 6, and this electric current produces symmetrical voltage through measuring resistance, and peak value is+V=-V.Make magnetic flux non-vanishing if I1 occurs, square wave current is Symmetrical no longer, as shown in Figure 7, sampling resistor occurs even harmonic voltages signal.Suppress to remove the first-harmonic in detection signal and other subharmonic compositions by bandpass filter, even-order harmonic is amplified independent, demodulate amplitude and the direction of measured signal again through detecting circuit, through effective low-pass filtering and amplification, produce the DC current I2 be directly proportional.
Detect winding and construct compensation magnetic flux by electric current I 2, the biased magnetic flux consisted of electric current I 1 with loop, former limit is cancelled out each other, and reaches the object that in magnetic core, positive and negative magnetic flux is symmetrical.Now the electric current I 2 detected in winding no longer changes, and detects I2 thus indirect detection goes out the value of I1 by shunt resistance.
Above-mentioned just preferred embodiment of the present utility model, not does any pro forma restriction to the utility model.Although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model.Any those of ordinary skill in the art, when not departing from technical solutions of the utility model scope, the technology contents of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solutions of the utility model, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solutions of the utility model, according to the utility model technical spirit to any simple modification made for any of the above embodiments, equivalent variations and modification, all should drop in the scope of technical solutions of the utility model protection.
Claims (10)
1. a direct-current electric energy meter calibrating device, it is characterized in that, comprise standard direct current table module, the program control source module of DC voltage, the program control source module of DC current and system control module, the voltage and current signal of detection is input in the program control source module of DC voltage and the program control source module of DC current by described system control module respectively, the program control source module of described DC voltage and the program control source module of DC current carry out measuring and measuring according to the voltage and current signal of input, and export DC voltage standard and DC current standard source, voltage output end measuring circuit is provided with between described standard direct current table module and DC voltage standard output terminal, current output terminal measuring circuit is provided with between described standard direct current table module and DC current standard source output terminal.
2. direct-current electric energy meter calibrating device according to claim 1, it is characterized in that, the program control source module of described DC voltage comprises voltage signal source module, difference adjustment module and voltage power amplifier standard source module, the voltage signal of described system control module is sent to after difference adjustment module and voltage power amplifier standard source resume module through voltage signal source module successively, exported by DC voltage standard output terminal, between described DC voltage standard output terminal and described difference adjustment module, be provided with voltage measurement negative feedback loop.
3. direct-current electric energy meter calibrating device according to claim 2, is characterized in that, described voltage signal source module is controllable sine wave, distorted wave voltage signal source based on digital signal processor DSP and high-speed A/D converter composition.
4. direct-current electric energy meter calibrating device according to claim 2, it is characterized in that, described voltage power amplifier standard source module comprises PWM controller, output transformer, current rectifying and wave filtering circuit and sampling feedback circuit, the input signal of described voltage power amplifier standard source module is after PWM controller process, be input to output transformer and carry out transformation process, export after current rectifying and wave filtering circuit process again, and feed back to PWM controller at output terminal by sampling feedback circuit sampling.
5. direct-current electric energy meter calibrating device according to claim 1, it is characterized in that, the program control source module of described DC current comprises current signal source module, difference adjustment module and current amplification standard source module, the current signal of described system control module is sent to after difference adjustment module and current amplification standard source resume module through current signal source module successively, exported by DC current standard source output terminal, between described DC current standard source output terminal and described difference adjustment module, be provided with current measurement negative feedback loop.
6. direct-current electric energy meter calibrating device according to claim 5, is characterized in that, described current signal source module be based on digital signal processor DSP and high-speed A/D converter composition controllable sine wave, distorted wave current signal source.
7. direct-current electric energy meter calibrating device according to claim 5, it is characterized in that, described current amplification standard source module comprises power amplifier, light-coupled isolation module, direct current instrument transformer module and large power supply generative circuit, the input signal of described current amplification standard source module carries out after amplifier through power amplifier, carry out light-coupled isolation by light-coupled isolation module, then carry out power amplification through direct current instrument transformer module and carry out the stable current source of coupling output with large power supply generative circuit.
8. direct-current electric energy meter calibrating device according to claim 7, it is characterized in that, module is there is in described current amplification standard source module for simulation shunt exports mV, simulation shunt exports mV generation module and comprises power amplifier driving circuit, triode and feedback circuit, described simulation shunt exports mV and the input signal of module occurs for simulation small voltage amount, input signal controls the input impedance of triode by power amplifier driving circuit, feedback circuit obtains voltage signal based on electric resistance partial pressure mode, realizes the dynamic adjustments to output voltage.
9. direct-current electric energy meter calibrating device according to claim 7, it is characterized in that, described direct current instrument transformer module comprises square wave excitation module, Signal-regulated kinase and power amplifier module, described square wave excitation module by signal acts on high permeability iron-core coil, by measuring resistance ground connection after Signal-regulated kinase and power amplifier module process.
10. direct-current electric energy meter calibrating device according to claim 9, it is characterized in that, described Signal-regulated kinase comprises bandpass filter, detecting circuit, low-pass filter and DC amplification circuit, first-harmonic in described bandpass filter removal detection signal and other subharmonic compositions, even-order harmonic is amplified independent, demodulate amplitude and the phase place of even harmonics signal again through detecting circuit, produce through low-pass filtering and amplification the DC current be directly proportional.
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| CN106772209A (en) * | 2017-01-11 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | For electric energy meter direct current and the load automatic matching device of even-order harmonic influence experiment |
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