CN202018467U - Current calibration source for alternating-current and direct-current electricity - Google Patents
Current calibration source for alternating-current and direct-current electricity Download PDFInfo
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- CN202018467U CN202018467U CN201120128195XU CN201120128195U CN202018467U CN 202018467 U CN202018467 U CN 202018467U CN 201120128195X U CN201120128195X U CN 201120128195XU CN 201120128195 U CN201120128195 U CN 201120128195U CN 202018467 U CN202018467 U CN 202018467U
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Abstract
A current calibration source for alternating-current an direct-current electricity is used for verification of ampere meters and scientific research testing and comprises an input device, a control circuit, a signal conversion circuit, a power amplifying circuit, a sample feedback circuit and a display circuit. Input signals are inputted to the control circuit by the input device, output signals of the control circuit are transmitted to the power amplifying circuit via the signal conversion circuit, output signals of the power amplifying circuit are divided into two channels, one signal channel of the power amplifying circuit is transmitted to the sample feedback circuit, and the other signal channel of the power amplifying circuit is outputted to the display circuit. The current calibration source is high in output power, stability and display precision and convenient in operation.
Description
Technical field
The utility model relates to a kind of reometer Jian that is applied to and Dings ac and dc current calibration source in the ﹑ scientific research test.
Background technology
Current magnitude is counted the fundamental quantity of ﹑ electricity metering as an important ginseng of electric energy, is widely used in electricity plating ﹑ electricity smelting ﹑ motor manufacturing and inspection and repaiies ﹑ battery and fields such as electric locomotive ﹑ aviation even space flight.The alterating and direct current flow value is pacified to hundreds of peace several kilo-amperes of ﹑ even ampere up to ten thousand from a few peace ﹑ tens.Accurate metering to these alterating and direct current flow values is directly connected to running effect, concerns product quality, even is related to the success or failure of total system.
What the current magnitude transmission/traceability system of China Sheng city Ji ﹑ large and medium-sized enterprise and national defense industry was used in a large number is the XF type device in the sixties and the standard source and the digital instruments such as FLUKE of import.The common ground of these devices is that the measuring accuracy behind range Xiao ﹑ interchange parameter and the spread spectrum is low, can not satisfy the needs of the state people through the development of Ji ﹑ Defence business and instrumental technique, therefore developing the above high-amperage value of 10A, to transmit/trace to the source standard source be very significant.
Summary of the invention
The purpose of this utility model is intended to overcome the defective of prior art, provides a provenance ﹑ to show the ac and dc current calibration source that the big merit rate of the smart degree ﹑ of incorporate height ﹑ wideband rings.
Ac and dc current calibration source described in the utility model, change Dian Lu ﹑ power amplification Dian Lu ﹑ sampling feedback circuit and display circuit is formed by input equipment, control circuit, Xin Bian, by input equipment input signal is inputed to control circuit, the output signal of control circuit is delivered to power amplification circuit through signal conversion circuit, the output signal of power amplification circuit is divided into two-way, wherein one road signal is delivered to the sampling feedback circuit, and another road signal exports display circuit to.
Described input equipment is a kind of in keyboard, mouse, the scanner.
Described input equipment has the RSC interface.
Described signal conversion circuit is counted word frequency by DC voltage benchmark device ﹑ and is closed into device ﹑ digital wave compositor and constitute, and DC voltage benchmark device ﹑ counts word frequency and closes into device ﹑ digital waveform compositor and connect with control circuit respectively.
Described DC voltage benchmark Qi ﹑ digital frequency synthesizer is adjustable.
Described sampling feedback circuit constitutes by exchanging twin-stage Dian stream Hu Gan Qi ﹑ DC current comparator, DC current comparator and the input end that exchanges two-stage current transformer all connect with high-power darlington pipe in the power amplifier, the output terminal of DC current comparator connects with DC preamplifier in the power amplification circuit, exchanges preposition pretreater connection in the output terminal that exchanges two-stage current transformer and the power amplification circuit.
Described power amplification circuit is put amplifier ﹑ before by direct current and is exchanged the preposition pre-reason device ﹑ of place high-power darlington pipe and constitute, the input end of DC preamplifier connects with DC current comparator in the sampling feedback circuit, exchange the input end of preposition pretreater and connect with digital frequency synthesizer in the signal conversion circuit, DC preamplifier all connects with the high-power darlington pipe with the output terminal that exchanges preposition pretreater.
Described display circuit is made of A/D Zhuan Huan Qi ﹑ parallel multiplication, display, the input end of A/D converter connects with high-power darlington pipe in the power amplification circuit, its output terminal connects with the input end of parallel multiplication, parallel multiplication connects with control circuit by buffer, and display connects with control circuit.
Described control circuit is a single-chip microcomputer.
The computing machine of described control circuit for connecting by the RS232 interface.
Ac and dc current calibration source described in the utility model, take special driver element circuit and feedback circuit to reach stable output, wherein AC driving circuit adopts the error-feedforward technology, feedback circuit adopts first order mutual inductor to do and exchanges interior ring feedback, second level mutual inductor is done the outer shroud feedback after AC-DC conversion, provide high-precision exchange conversion signal to display circuit simultaneously; Dc drive circuit adopts the combination misalignment feed-forward technique, and the DC current comparator is done big loop feedback, provides high-precision DC converting signal to display circuit simultaneously; Display circuit has adopted several words to adopt sample ﹑ digital multiplication technology, calculates the alterating and direct current flow valuve respectively, exchanges Direct Digital and adopts multiplication techniques to guarantee the high precision that the interchange value is measured.The utility model output power Da ﹑ degree of stability height, the display precision height, easy to operate.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model.
The 1-input equipment, 2-control circuit, 3-signal conversion circuit, 4-sampling feedback circuit, 5-power amplification circuit, 6-display circuit.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing, but be not limited to embodiment.
Embodiment
Ac and dc current calibration source described in the utility model, comprise input equipment 1, control circuit 2, signal conversion circuit 3 ﹑ power amplification circuits 5 ﹑ sampling feedback circuit 4 and display circuits 6, by input equipment 1 input signal is inputed to control circuit 2, the output signal of control circuit 2 is delivered to power amplification circuit 5 behind signal conversion circuit 3, the output signal of power amplification circuit 5 is divided into two-way, wherein one road signal is delivered to sampling feedback circuit 4, and another road signal exports display circuit 6 to.Input equipment 1 can be a kind of in keyboard, mouse, the scanner, and has the RSC interface.
The each several part technical scheme is as follows:
Signal conversion circuit 3 comprises that DC voltage benchmark device ﹑ counts word frequency and closes into device ﹑ digital wave compositor, and DC voltage benchmark device ﹑ counts word frequency and closes into device ﹑ digital waveform compositor and connect with control circuit respectively.Signal conversion circuit is the basis of ac and dc current calibration source, by output signal is stored among the ROM by signaling point is scanned the signal output that realizes different cycles by frequency according to the point of one-period, the degree of stability of signal guarantees the degree of stability that whole calibration source finally can reach.The DC voltage benchmark of DAC702 adjustable dc voltage standard is controlled the output amplitude of whole calibration source, the adjusting of output amplitude realizes by regulating the DC voltage benchmark, the DC voltage benchmark has determined the output stability of whole calibration source, the amplitude adjusting of calibration source selects for use the sixteen bit D/A DAC702KH of U.S. BB company production as master control DC voltage benchmark, degree of stability reaches 0.002%/3 minute, in addition the potentiometer auxiliary adjustment guarantees to regulate fineness and comes from 0.001%; The adjustable frequency compositor adopts Direct Digital Frequency Synthesizers DDS special chip AD9850, and 32 control accuracies have the high advantage of the wide degree of stability of output area.AC signal in the digital waveform compositor is synthetic mainly to be finished by high-speed A/D converter output afterwards by waveform is synthetic, waveform is synthetic to be finished by MCU2, digital to analog converter adopts 12 AD565A chip, full scale switching time is 30ns, synthetic AC signal degree of stability is better than 0.005%/3 minute, and waveform distortion is better than 0.05%.
Sampling feedback circuit 4 comprises twin-stage AC current transformer and DC current comparator, employing can adapt to the twin-stage AC current transformer of alternating current-direct current feedback sample and DC current comparator and finish respectively ac and dc current is sampled, the DC current comparator all connects with the high-power darlington pipe with the input end that exchanges two-stage current transformer, the output terminal of DC current comparator connects with DC preamplifier, the output terminal that exchanges two-stage current transformer with exchange preposition pretreater connection, signal after the sampling is divided into two-way, one the tunnel as feedback signal, and another road is as shows signal.Two-stage current transformer belongs to the interchange feedback sample, has degree of precision, and Bi Cha ﹑ angular difference is very little, has guaranteed that the error of feedback and shows signal is minimum; The DC current comparator belongs to the DC feedback sampling, Chang Gui DC current was sampled as shunt in the past, the sampled signal amplitude is little, temperature drift is big, be difficult to guarantee noise stability when, so in calibration source, developed the DC current comparator as sampling element, reached the low drift of high amplitude ﹑, guarantee that output of direct current high stable and high precision show.
Display circuit 6 has comprised each link of measurement instrument, A/D Zhuan Huan Qi ﹑ digital multiplication Lei Jia Qi ﹑ display, the input end of A/D converter connects with the high-power darlington pipe, its output terminal connects with parallel multiplication, parallel multiplication connects with control circuit through buffer, information is after treatment delivered to display and is shown, and the performance of display circuit has determined final display precision, is that whole calibration source embodies as the final value that amount passes.The Jing Du ﹑ linear error of A/D converter has determined display precision, has adopted sixteen bit high precision chip AD977A to do the A/D conversion; Parallel multiplication carries out multiplication with the A/D data converted and adds up, and result who adds up according to multiplication and various calculation of parameter go out Dian Liu Zhi ﹑ Pin and Shuai parameters such as ﹑ degree of stability; Display demonstrates the value parameter that needs and Shuais ﹑ degree of stability etc. such as Dian Liu Zhi ﹑ Pin, and communication interface is sent to host computer with data, realizes that PROGRAMMED AUTO Jiao Yan ﹑ Shuo prints according to Cun Chu ﹑ result.
Ac and dc current calibration source described in the utility model has the tester function, can export/measure 0～50A ac and dc current, the various ac and dc current table of verification; Have panel programming and the program control management software platform of host computer, realize Gong Neng ﹑ gear Zhuan Huan ﹑ Cheng control Cao semi-automatic verification of Zuo ﹑ and Shuo reportedly Shu ﹑ Cun Chu ﹑ manage etc.; Having Wen Du of Dinging ﹑ frequency tests oneself/Presentation Function.Output/measurement range is 0～50A, divides six grades of 0.2A ﹑ 1A ﹑ 5A ﹑ 10A ﹑ 20A ﹑ 50A, and is adjustable continuously; When each parameter reaches ratings output stability be better than 0.005%/minute; The AC ripple of direct current signal≤1%; AC signal degree of distortion≤0.5%; The output signal frequency scope is 45Hz～1kHz; Measuring display precision is that direct current is better than 0.01%, exchanges 45Hz～65Hz and is better than 0.01%; 65Hz～1kHz is better than 0.05%; Measurement was shown as precision 0.01% when frequency was 45Hz～1kHz.
Ac and dc current calibration source described in the utility model, the source table required to the reometer verification carried out integrated design, surely spending ﹑ surely in source output fails out merit rate ﹑ table and surveys aspect device more in the past such as accuracy of measurement ﹑ electric current range ﹑ extension frequency precision and all be improved largely, for providing value Ke Kao ﹑, the transmission of quantity value of ac and dc current/trace to the source can Wen Dings the multiple functional calibration source of ﹑, improved work efficiency, thereby realized that Yuan ﹑ shows that incorporate Gao Jing Du ﹑ Da Gong Shuais that the ﹑ wideband rings and easy to operate.
Claims (10)
1. ac and dc current calibration source, by input equipment (1), control circuit (2), signal conversion circuit ((3) ﹑ power amplification circuits are formed by 5) ﹑ sampling feedback circuit (4) and display circuit (6), it is characterized in that, by input equipment (1) input signal is inputed to control circuit (2), the output signal of control circuit (2) is delivered to power amplification circuit (5) through signal conversion circuit (3), the output signal of power amplification circuit (5) is divided into two-way, wherein one road signal is delivered to sampling feedback circuit (4), and another road signal exports display circuit (6) to.
2. ac and dc current calibration source according to claim 1 is characterized in that, described input equipment (1) is a kind of in keyboard, mouse, the scanner.
3. ac and dc current calibration source according to claim 1 is characterized in that, described input equipment (1) is equipped with the RSC interface.
4. ac and dc current calibration source according to claim 1, it is characterized in that, described signal conversion circuit (3) is counted word frequency by DC voltage benchmark device ﹑ and is closed into device ﹑ digital wave compositor and constitute, and DC voltage benchmark device ﹑ counts word frequency and closes into device ﹑ digital waveform compositor and connect with control circuit (2) respectively.
5. according to claim 1 or 4 described ac and dc current calibration sources, it is characterized in that DC voltage benchmark Qi ﹑ digital frequency synthesizer is adjustable.
6. ac and dc current calibration source according to claim 1, it is characterized in that, described sampling feedback circuit (4) constitutes by exchanging twin-stage Dian stream Hu Gan Qi ﹑ DC current comparator, DC current comparator and the input end that exchanges two-stage current transformer all connect with high-power darlington pipe in the power amplifier, the output terminal of DC current comparator connects with DC preamplifier in the power amplification circuit, exchanges preposition pretreater connection in the output terminal that exchanges two-stage current transformer and the power amplification circuit.
7. ac and dc current calibration source according to claim 1, it is characterized in that, described power amplification circuit (5) exchanges the preposition reason device ﹑ of pre-place high-power darlington pipe and constitutes by putting amplifier ﹑ before the direct current, the input end of DC preamplifier connects with DC current comparator in the sampling feedback circuit, exchange the input end of preposition pretreater and connect with digital frequency synthesizer in the signal conversion circuit, DC preamplifier all connects with the high-power darlington pipe with the output terminal that exchanges preposition pretreater.
8. ac and dc current calibration source according to claim 1, it is characterized in that, described display circuit (6) is made of A/D Zhuan Huan Qi ﹑ parallel multiplication, display, the input end of A/D converter connects with high-power darlington pipe in the power amplification circuit, its output terminal connects with the input end of parallel multiplication, parallel multiplication connects with control circuit by buffer, and display connects with control circuit.
9. ac and dc current calibration source according to claim 1 is characterized in that, described control circuit (2) is a single-chip microcomputer.
10. ac and dc current calibration source according to claim 1 is characterized in that, the computing machine of described control circuit (2) for connecting by the RS232 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120128195XU CN202018467U (en) | 2011-04-27 | 2011-04-27 | Current calibration source for alternating-current and direct-current electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120128195XU CN202018467U (en) | 2011-04-27 | 2011-04-27 | Current calibration source for alternating-current and direct-current electricity |
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| Publication Number | Publication Date |
|---|---|
| CN202018467U true CN202018467U (en) | 2011-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120128195XU Expired - Lifetime CN202018467U (en) | 2011-04-27 | 2011-04-27 | Current calibration source for alternating-current and direct-current electricity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253258A (en) * | 2011-04-27 | 2011-11-23 | 云南省计量测试技术研究院 | Alternating/direct current calibration source |
| CN102565740A (en) * | 2011-12-29 | 2012-07-11 | 广东中钰科技有限公司 | Portable intelligent signal generation calibration device |
| CN108845167A (en) * | 2018-04-15 | 2018-11-20 | 武汉市整流器研究所 | A kind of strong current generator device |
-
2011
- 2011-04-27 CN CN201120128195XU patent/CN202018467U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253258A (en) * | 2011-04-27 | 2011-11-23 | 云南省计量测试技术研究院 | Alternating/direct current calibration source |
| CN102565740A (en) * | 2011-12-29 | 2012-07-11 | 广东中钰科技有限公司 | Portable intelligent signal generation calibration device |
| CN108845167A (en) * | 2018-04-15 | 2018-11-20 | 武汉市整流器研究所 | A kind of strong current generator device |
| CN108845167B (en) * | 2018-04-15 | 2021-01-05 | 武汉市整流器研究所 | Large current generator device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111026 |
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| CX01 | Expiry of patent term |