CN103812354A - Broadband strong current generator power supply - Google Patents
Broadband strong current generator power supply Download PDFInfo
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- CN103812354A CN103812354A CN201410060491.9A CN201410060491A CN103812354A CN 103812354 A CN103812354 A CN 103812354A CN 201410060491 A CN201410060491 A CN 201410060491A CN 103812354 A CN103812354 A CN 103812354A
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Abstract
The invention relates to a broadband strong current generator power supply. The broadband strong current generator power supply comprises a rectification filtering module, an inversion filtering module, a single chip microcomputer for core control, a digital/analog (D/A) conversion module, a pulse width modulation voltage stabilizing circuit module, a voltage sampling circuit and a current sampling circuit, wherein the pulse width modulation voltage stabilizing circuit module is used for modulating broadband strong current output, the voltage sampling circuit is in feedback connection between the single chip microcomputer and a strong current generator input end to collect strong current generator input voltage, the current sampling circuit is in feedback connection between the single chip microcomputer and a strong current generator output end to collect strong current generator output current, and an output end of the pulse width modulation voltage stabilizing circuit module is electrically connected with an input end of the inversion filtering module. According to the broadband strong current generator power supply, the single chip microcomputer is used, so that on one hand, output current of a strong current generator is adjusted on the basis of pulse width modulation voltage stability control to achieve the effect of generating strong current, on the other hand, current stabilization is achieved through feedback of input voltage and output current of the strong current generator, and the strong current generator is higher in working efficiency, more stable in output current, higher in measuring accuracy, wider in frequency range and better in repeatability than traditional strong current generators.
Description
Technical field
The present invention relates to automation control and high-voltage testing equipment field, be specifically related to a kind of broadband up-flow device power supply.
Background technology
Electromagnetic current transducer is the key equipment in electric power system, operate in all the year round in electrical network, supply harmonic is very harmful to electromagnetic current transducer, harmonic current increases the copper loss of current transformer, accelerate its aging or damage, can have a strong impact on the normal operation of equipment, very dangerous explosion phenomenon even can occur.If can apply to electromagnetic current transducer the electric current of different frequency, analyze the error characteristics of current transformer under different frequency, and then analyze the harm of harmonic wave to current transformer, and prevented, can avoid causing more serious consequence.
Current lifting device is also strong current generator, and in electric power system, technical staff often adopts current lifting device to check current transformer, by current lifting device cut-in operation power supply, by adjusting voltage regulator output voltage to obtain the required large electric current of test.Owing to being subject to technical limitations, current lifting device output current is often stable not, and reference frequency output is narrower, does not often reach good test effect.
Summary of the invention
The present invention seeks to provide in order to overcome the deficiencies in the prior art a kind of provides wideband input signal and can regulate and the current lifting device power supply of stable current lifting device output current.
For achieving the above object, the technical solution used in the present invention is: a kind of broadband up-flow device power supply, it comprises the rectification filtering module for interchange AC voltage input signal being converted to direct voltage output, be electrically connected for d. c. voltage signal being converted to the inversion filtration module of setpoint frequency AC signal with described rectification filtering module output, described inversion filter module output and current lifting device are electrically connected, described current lifting device and current transformer to be measured are electrically connected, it also comprises the single-chip microcomputer for core control, the D/A modular converter being electrically connected with described single-chip microcomputer output, be electrically connected for modulating the pulse width modulated voltage regulator circuit module of wideband High-current output with described D/A modular converter output, feedback link between described single-chip microcomputer and current lifting device input for gathering the voltage sample circuit of current lifting device input voltage, feedback link between described single-chip microcomputer and current lifting device output for gathering the current sampling circuit of current lifting device output current, described pulse width modulated voltage regulator circuit module output and described inversion filter module input are electrically connected.
Optimally, described pulse width modulated voltage regulator circuit module is SPWM modulation, and it is mainly made up of triangle wave generating circuit, Sine Modulated wave generation circuit and comparator.
Optimally, described D/A modular converter comprises DDS circuit and the D/A circuit for common regulation and control pulse width modulated voltage regulator circuit module output waveform pulsewidth and frequency.
Optimally, described inversion filtration module is that IGBT drives inversion filtration module.
Optimally, it also comprises the liquid crystal display showing for voltage, electric current.
Optimally, described single-chip microcomputer is realized described current lifting device up-flow, the control of current stabilization based on pid algorithm.
Owing to adopting technique scheme, beneficial effect of the present invention: the present invention adopts single-chip microcomputer, and based on pulse-width modulation voltage stabilizing control, regulate on the one hand the output current of current lifting device, reach the effect of up-flow, by by the input voltage feedback of current lifting device and current lifting device output current feedback, realize the object of current stabilization on the other hand.It is higher than traditional current lifting device operating efficiency, outputting current steadily, and certainty of measurement is high, and wide frequency range is reproducible.Up-flow power supply of the present invention can directly be exported the sine voltage of 30Hz～2500Hz, 0～150V, except the harmonic wave testing experiment for current transformer, can also use in the test occasion that need to use frequency conversion voltage adjusting power supply for other.
Accompanying drawing explanation
Accompanying drawing 1 is current lifting device power principle block diagram of the present invention;
Accompanying drawing 2 is pulse width modulated voltage regulator circuit module principle block diagram;
Accompanying drawing 3 is based on pid algorithm up-flow, current stabilization flow chart;
Wherein: 1, rectification filtering module; 2, inversion filtration module; 3, current lifting device; 4, sample; 5, single-chip microcomputer; 6, D/A modular converter; 7, pulse width modulated voltage regulator circuit module; 8, voltage sample circuit; 9, current sampling circuit; 10, display.
Embodiment
Below in conjunction with specific embodiment, technical solution of the present invention is done to detailed introduction:
Current lifting device power supply as shown in Figure 1, it comprises rectification filtering module 1, inversion filtration module 2, single-chip microcomputer 5, D/A modular converter 6, pulse width modulated voltage regulator circuit module 7, voltage sample circuit 8, current sampling circuit 9, wherein, rectification filtering module 1 input is connected with AC alternating current, its output and inversion filtration module 2 are electrically connected, the output of inversion filtration module 2 is connected with current lifting device 3, when needs are current transformer teacher of the testing to sample 4, current lifting device 3 outputs and sample 4 are joined.Single-chip microcomputer 5, D/A modular converter 6, pulse width modulated voltage regulator circuit module 7 outputs are electrically connected successively, and pulse width modulated voltage regulator circuit module 7 outputs are connected with inversion filtration module 2 inputs, thereby single-chip microcomputer 5, D/A modular converter 6, pulse width modulated voltage regulator circuit module 7, inversion filtration module 2, current lifting device 3 and sample 4 form main control circuit.Voltage sample circuit 8 feedback links are between single-chip microcomputer 5 and current lifting device 3 inputs, and current sampling circuit 9 feedback links are between single-chip microcomputer 5 and current lifting device 3 outputs.
In the present embodiment, inversion filtration module 2 adopts IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) to drive, and pulse width modulated voltage regulator circuit module 7 adopts SPWM modulation technique.Specific works principle is:
Exchange AC voltage signal and become direct current signal after rectification filtering module 1, export to IGBT pulse-width adjustment inversion filtration module 2, single-chip microcomputer 5 requires to export digital controlled signal to D/A modular converter 6 according to setting, analog control signal after 6 conversions of D/A modular converter enters SPWM pulse width modulated voltage regulator circuit module 7, pulse-width modulation circuit produces the SPWM ripple that can change frequency, frequency range is at 30Hz～2500Hz, and export to IGBT pulse-width adjustment inversion filtration module 2, this signal drives through IGBT, pass through again bridge type inverse, isolation transformation and filtering export current lifting device 3 to, thereby current lifting device 3 can be realized the output of wide electric current tested current transformer etc. is detected.In current lifting device power supply running, the current lifting device output current feedback signal that the current lifting device input voltage feedback signal that single-chip microcomputer 5 also can be exported according to voltage sample circuit 8 and current sampling circuit 9 are exported is carried out the current stabilization control of current lifting device.Concrete control principle is as follows:
First, based on SPWM, pulse-width modulation realizes the control that wideband is exported.As shown in Figure 2, it adopts analog circuit to form triangular wave carrier circuit and Sine Modulated wave generation circuit, determines their intersection point with comparator, the conversion of exporting low and high level in the intersection point moment, thus generate SPWM ripple.DDS (Direct Digital Synthesizer) circuit and D/A control circuit regulate sinusoidal wave frequency and amplitude, regulate pulsewidth and the frequency of SPWM ripple.SPWM composite part is to compare with triangular wave with sinusoidal wave, and sine wave is greater than the part of triangular wave, is output as positive pulse, is less than part output negative pulse, and synthetic SPWM ripple enters IGBT and drives.
To the control of up-flow, current stabilization, the present embodiment adopts pid algorithm.Fig. 3 is the flow chart of realizing up-flow, current stabilization with pid algorithm.The stabling current I of the final output of current lifting device
odepend on the direct voltage of D/A output, and this voltage is determined to 16 bit X of D/A circuit input by single-chip microcomputer.Theoretically, after the hardware parameter of system is established, to the high pressure I of each setting
o, its corresponding D/A input X also should determine.
Pid algorithm up-flow and current stabilization stage, the value that increases progressively each time Δ X is calculated by pid algorithm.
If default output current value is I
os; In working control process, output current sampled value is I
oi; Front twice output current sampled value is respectively: I
oi-1, I
oi-2.Can calculated difference be:
ei＝I
os-I
oi；
Δei＝ei-ei-1＝I
oi-1-I
oi；
Δ2ei＝Δei-Δei-1＝2I
oi-1-I
oi-I
oi-2。
Can be calculated by pid algorithm:
ΔX
i+1＝ΔX
i+K(Δei+I
ei+DΔ2ei)。
Wherein Δ X
i+ 1 for inputting the data increment of D/A, Δ X
ifor the front data increment of once inputting D/A.In superincumbent expression formula, K, I, D are respectively proportionality coefficient, integral coefficient and differential coefficient, and the size of its value is according to the situation adjustment of real system.
Enter pid algorithm boost phase, the Δ X in above formula
iinitial value be exactly the Δ X of previous stage
o, along with the rising increment value Δ X of voltage
i+1more and more less, boost stable after this value be 0.The time interval that at every turn increases progressively input D/A data X in PID control procedure is also a very important parameter, the size in this time interval depends on such three factors: D/A data are input to slow Henan time, the hardware parameter of system and the pressure rising time that software sets of stable high voltage output, and the size of its value is according to the situation adjustment of real system.
Fig. 3 is up-flow, current stabilization flow chart, and the calculating at the beginning of program is also given corresponding register assignment parameter, and these parameters are used in the process of boosting, as Δ X
o, PID COEFFICIENT K, P, I, D etc.While starting up-flow, input Δ X to D/A
o, in the time of hardware designs, the register in D/A chip is designed to the unit of the outer data storage of monolithic Bigpian, therefore, as long as carry out the outer data storage instruction of access sheet, just can transmit data to D/A chip.Calculate Δ X with pid algorithm at every turn
i+1, then be input in D/A and go, export corresponding electric current, until output current reaches setting electric current.Reaching the right double counting Δ of current setting value successor X
i+1make outputting current steadily in set point.
To sum up, SPWM pulsewidth voltage stabilizing control for current lifting device power acquisition of the present invention, regulate on the one hand current lifting device output current, on the other hand, input voltage feedback by current lifting device and current lifting device output current FEEDBACK CONTROL realize the current stabilization of current lifting device, and it is higher than traditional current lifting device operating efficiency, and output current is more stable, certainty of measurement is higher, and frequency range is wider.The power supply instrument that adopts technical solution of the present invention to make can also increase manual test and autorun, a tractor serves several purposes.And it can adopt display 10 operation and control interfaces, external mini-printer etc., facilitate Site Detection to use.
Current lifting device power supply of the present invention can directly be exported the sine voltage of 30Hz～2500Hz, 0～150V, so except the harmonic wave testing experiment for current transformer (CT), can also use in the test occasion that need to use frequency conversion voltage adjusting power supply for other.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (6)
1. a broadband up-flow device power supply, it comprises the rectification filtering module for interchange AC voltage input signal being converted to direct voltage output, be electrically connected for d. c. voltage signal being converted to the inversion filtration module of setpoint frequency AC signal with described rectification filtering module output, described inversion filter module output and current lifting device are electrically connected, described current lifting device and current transformer to be measured are electrically connected, it is characterized in that: it also comprises the single-chip microcomputer for core control, the D/A modular converter being electrically connected with described single-chip microcomputer output, be electrically connected for modulating the pulse width modulated voltage regulator circuit module of wideband High-current output with described D/A modular converter output, feedback link between described single-chip microcomputer and current lifting device input for gathering the voltage sample circuit of current lifting device input voltage, feedback link between described single-chip microcomputer and current lifting device output for gathering the current sampling circuit of current lifting device output current, described pulse width modulated voltage regulator circuit module output and described inversion filter module input are electrically connected.
2. a kind of broadband up-flow device power supply according to claim 1, is characterized in that: described pulse width modulated voltage regulator circuit module is SPWM modulation, and it is mainly made up of triangle wave generating circuit, Sine Modulated wave generation circuit and comparator.
3. a kind of broadband up-flow device power supply according to claim 1 and 2, is characterized in that: described D/A modular converter comprises DDS circuit and the D/A circuit for common regulation and control pulse width modulated voltage regulator circuit module output waveform pulsewidth and frequency.
4. a kind of broadband up-flow device power supply according to claim 1, is characterized in that: described inversion filtration module is that IGBT drives inversion filtration module.
5. a kind of broadband up-flow device power supply according to claim 1, is characterized in that: it also comprises the liquid crystal display showing for voltage, electric current.
6. a kind of broadband up-flow device power supply according to claim 1, is characterized in that: described single-chip microcomputer is realized described current lifting device up-flow, the control of current stabilization based on pid algorithm.
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| CN201410060491.9A CN103812354A (en) | 2014-02-24 | 2014-02-24 | Broadband strong current generator power supply |
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| CN201410060491.9A CN103812354A (en) | 2014-02-24 | 2014-02-24 | Broadband strong current generator power supply |
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Cited By (8)
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| CN105044533A (en) * | 2015-09-11 | 2015-11-11 | 哈尔滨电工仪表研究所 | Over-current testing device |
| CN105071667A (en) * | 2015-08-12 | 2015-11-18 | 哈尔滨理工大学 | Harmonic wave generator and method for detecting elements of power grid via the same |
| CN106033224A (en) * | 2015-03-16 | 2016-10-19 | 沈阳新松机器人自动化股份有限公司 | Large-current AC current source |
| CN106100407A (en) * | 2016-05-31 | 2016-11-09 | 东莞市思普电子有限公司 | Smart cloud AC power supply |
| CN107765099A (en) * | 2017-10-19 | 2018-03-06 | 国家电网公司 | A kind of broadband test apparatus and method for being used to measure grounding body impedance |
| CN110138232A (en) * | 2019-05-20 | 2019-08-16 | 中国地震局地壳应力研究所 | Seismological observation low-frequency ac stabilized current supply |
| CN110927420A (en) * | 2019-11-25 | 2020-03-27 | 国网宁夏电力有限公司电力科学研究院 | Current and voltage regulation and control system for feeder automation test |
| CN113985096A (en) * | 2021-10-26 | 2022-01-28 | 广东电网有限责任公司 | Mutual inductor wiring recognition device |
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| CN107765099A (en) * | 2017-10-19 | 2018-03-06 | 国家电网公司 | A kind of broadband test apparatus and method for being used to measure grounding body impedance |
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| CN110927420A (en) * | 2019-11-25 | 2020-03-27 | 国网宁夏电力有限公司电力科学研究院 | Current and voltage regulation and control system for feeder automation test |
| CN113985096A (en) * | 2021-10-26 | 2022-01-28 | 广东电网有限责任公司 | Mutual inductor wiring recognition device |
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Application publication date: 20140521 |