CN202102092U - Direct-current power supply testing device - Google Patents
Direct-current power supply testing device Download PDFInfo
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- CN202102092U CN202102092U CN 201120198804 CN201120198804U CN202102092U CN 202102092 U CN202102092 U CN 202102092U CN 201120198804 CN201120198804 CN 201120198804 CN 201120198804 U CN201120198804 U CN 201120198804U CN 202102092 U CN202102092 U CN 202102092U
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- 238000012360 testing method Methods 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000010363 phase shift Effects 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000001915 proofreading effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
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- 238000004804 winding Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- 206010044565 Tremor Diseases 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
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Abstract
The utility model relates to a direct-current power supply testing device which comprises an alternating current input filter circuit, a rectification circuit, a PFC (power factor correction) circuit, a phase-shifted full-bridge resonance soft switch conversion circuit and an output rectification filter circuit. The direct-current power supply testing device can conduct free adjustment protection and direct current control, adjust the range within 0-120 percent, and simulate the overvoltage and undervoltage state of related relay protection devices and secondary circuits so as to meet the testing requirement.
Description
Technical field
The utility model relates to a kind of direct supply, relates in particular to a kind of direct supply test unit, is applicable to each transformer station and power plant, belongs to the Electric Application field.
Background technology
The relay protection inspection procedure requires the total group test of protective device check under 80% rated voltage, to carry out, and does not have continuously adjustable Portable DC power supply test unit in the market.Though conventional reaying protection test appearance has direct current output, power is too little, generally has only about 250W, can not satisfy the requirement of on-the-spot total group test.
Summary of the invention
The utility model is to the problem that exists in the above-mentioned prior art; A kind of direct supply test unit is provided; Solved the problem of no special-purpose 80% experiment power supply of on-the-spot protective relaying device debugging in the prior art, and the utility model voltage is stable, reliability is high.
The technical scheme of the utility model is following:
Alternating current is input to the interchange input filter circuit, exchanges input filter circuit and makes power supply and electric network electromagnet compatibility; With the alternating current input rectification circuit, become HVDC after the rectification circuit rectification after the filtering of interchange input filter circuit; Rectification circuit is imported PFC (PFC) circuit with HVDC, and pfc circuit becomes the voltage stabilizing direct current after proofreading and correct; Direct voltage of voltage regulation is input to the full-bridge phase-shifting resonance circuit, and transformer is operated in the high frequency state, and the pulse duty cycle of full-bridge phase-shifting resonance circuit adjustment transformer makes the output voltage stabilizing; Transformer secondary output outputs to the power supply outside through behind the current rectifying and wave filtering circuit.
Described full-bridge phase-shifting resonance circuit is controlled the complete phase-shifting full-bridge master of two-way respectively through phased frequency multiplier circuit and is changed the loop, reaches frequency multiplication; Adjust two phase-shifting full-bridge masters through dynamic adjustment circuit and change the load current in loop, reach current-sharing output synchronous coordination.
Described phased frequency multiplier circuit with the UC3875 chip as the phase-shift soft switch main control chip; The UC3875 chip sends the fundamental frequency pwm signal of change-over circuit; The adjustable two-way pwm signal of phase angle that the controllable frequency multiplier circuit in dead band occurs frequently the pwm signal branch to differ; The two-way pwm signal is controlled two-way phase shift main circuit switch pipe respectively, reaches orderly conversion; Dynamically the adjustment circuit is the auxiliary winding through main conversion transformer, and the dynamic current ratio of sampling main-transformer changes, and through the dynamic adjustment of amplifier FEEDBACK CONTROL current-sharing electric current, influences the dead band adjustment of frequency multiplier circuit, thereby reaches the dynamic adjustments loop load.
The LR of the phase shift Zero-voltage soft switch transducer of described full-bridge phase-shifting resonance circuit is made up of the leakage inductance of extra resonance inductance and transformer, CR by the stray capacitance of transformer with add electric capacity and form; Every driving pulse that switching tube has same widths in the phase shift Zero-voltage soft switch pipe transducer has source time through phase shift dislocation control, reaches regulated output voltage.
The utility model has the advantages of as follows:
1, direct current 20V-255V is adjustable continuously; The long-time band of big electric current (5-10A) output carries; Can free adjustment protect, control direct current, regulating range is 0%-120%, simulates overvoltage, the under-voltage condition of relevant protective relaying device and secondary circuit, to satisfy testing requirements.
2, adopt phased frequency multiplier circuit and phase shift Zero-voltage soft switch transducer technology, voltage regulation performance is good,
Guarantee that voltage fluctuation is lower than 1% during the band impact load; Greatly reduce the switching loss of power device, improved efficient effectively, reduced the weight and volume of device; It is simple to have basic circuit, and control is succinct, and the trouble spot is few, the advantage that controlled stability is high.
3, adopt two-way full-bridge pattern conversion; Improve the service efficiency of conversion transformer; And the conversion of two-way full-bridge is in low pressure output balance and dynamic adjustments each other during with high pressure output, effectively improved output voltage shakiness and the control system phase margin that the duty-cycle loss under single full-bridge mode causes and caused problems such as system works instability inadequately.Remedy phased circuit effectively and under input wide region and the big situation of load variations, the no-voltage of managing that lags behind has been opened unfavorable situation.
4, through the frequency multiplication phase control unit; The phase change of control DC converting; Dynamically the load balance of adjustment two-way phased circuit reaches the conversion of direct current frequency multiplication, and the PWM switching frequency of complete machine is doubled; And corresponding to each phased full-bridge circuit, their frequency of operation all is a basic frequency; The control system that two mutual dynamic adjustments are arranged, the stability of system and the stabilizing voltage characteristic of output voltage in the time of can accomplishing wide region output.
5, voltage-regulation coefficient is high, source rate of change≤0.1%, load variations rate≤0.5%; Reliability and efficient are high, full load efficiency>=88%; Power factor>=0.99; Natural cooling; The interchange input range is wide, imports the overvoltage/undervoltage protection reliably, and WV 170～260V allows input voltage 150～450V; Input voltage AC, DC is compatible, gets final product input ac voltage, but also input direct voltage; The kinds of protect function, output overloading protection (current limliting); Output short circuit protection (current limliting); Output over-voltage protection (shutoff); Input under-voltage protection (turn-off, recover automatically); Input overvoltage protection (turn-off, recover automatically); Input surge voltage protection.
Heat protection function, when power supply was overheated, the machine internal fan started, to power supply heat sinking.
6, can be used as 80% voltage test power supply of the full inspection of protective relaying device, also can be used as work, the debugging power supply of capital construction, technological transformation protective relaying device when newly throwing equipment debugging, also can be widely used in fields such as electric power DC system, industry control, communication, scientific research.In the work of relay protection field adjustable, has an application value widely.
Description of drawings
Fig. 1 is the circuit theory schematic block diagram of the utility model.
Fig. 2 is the phase shift Zero-voltage soft switch converter circuit synoptic diagram of the utility model.
Fig. 3 is the phase shift Zero-voltage soft switch transducer drive waveforms synoptic diagram of the utility model.
Embodiment
The utility model, is described in detail as follows in conjunction with specific embodiment with reference to accompanying drawing.
Embodiment
Shown in 1 figure, alternating current is input to the interchange input filter circuit, exchanges input filter circuit and makes power supply and electric network electromagnet compatibility; With the alternating current input rectification circuit, become HVDC after the rectification circuit rectification after the filtering of interchange input filter circuit; Rectification circuit is imported PFC (PFC) circuit with HVDC, and pfc circuit becomes 380V voltage stabilizing direct current after proofreading and correct; The 380V DC voltage is input to the full-bridge phase-shifting resonance circuit, and transformer is operated in the high frequency state, and the pulse duty cycle of full-bridge phase-shifting resonance circuit adjustment transformer makes the output voltage stabilizing; Transformer secondary output outputs to the power supply outside through behind the current rectifying and wave filtering circuit.
Control the complete phase-shifting full-bridge master of two-way respectively through phased frequency multiplier circuit and change the loop, and pass through phase control techniques, reach the purpose of frequency multiplication by two-way major loop resonance work in order successively.Simultaneously, adjust the load current in two loops, reach the purpose of current-sharing output synchronous coordination work through dynamic adjustment circuit.
As shown in Figure 2, LR is made up of two parts among the figure, and the one, the extra resonance inductance; The 2nd, the leakage inductance of transformer, CR by the stray capacitance of transformer with add electric capacity and form.Every driving pulse that switching tube has same widths in the phase shift Zero-voltage soft switch pipe transducer has source time through phase shift dislocation control, thereby reaches the purpose of regulated output voltage.When a switching tube turn-offs; Transformer's primary current is given the shunt capacitance charging of the switching tube that turn-offs; Make the shunt capacitance discharge of the switching tube that same brachium pontis is about to open simultaneously, when the switching tube shunt capacitance that turn-offs is charged to supply voltage, the switching tube inverse parallel diode nature conducting that is about to open; At this moment open switching tube, then this pipe is exactly that no-voltage is open-minded.And switching tube is when turn-offing, because it has shunt capacitance, switching tube is the no-voltage shutoff like this; Therefore under this phase shift control mode, switching tube is switch under no-voltage, and its drive waveforms is as shown in Figure 3: dash area is the source time that has of transmission of power among the figure; The fixing phase place of SA, SB moves the phase place of SD, SC, can reach the purpose that adjustment has source time; SD (SC) is when opening like this, and not conducting of SA (SB) does not have electric current to flow through; SD (SC) does not have turn-on consumption, and only SA (SB) has; When SD (SC) turn-offed, SA (SB) did not turn-off, and SA (SB) drain-source utmost point no-voltage changes, and does not have turn-on consumption, and only SD (SC) has turn-on consumption.
Phased frequency multiplier circuit be with the UC3875 chip as the phase-shift soft switch main control chip, send the fundamental frequency pwm signal of change-over circuit through UC3875, the frequency multiplier circuit that the dead band is controllable divides the two-way pwm signal that occurs frequently with PWM, the phase angle that differs is adjustable.Control two-way phase shift main circuit switch pipe respectively through this two-way pwm signal then, reach the purpose of orderly conversion.And dynamically adjust circuit is the auxiliary winding through main conversion transformer; The dynamic current ratio of sampling main-transformer changes; Through the dynamic adjustment of amplifier FEEDBACK CONTROL current-sharing electric current, influence the dead band adjustment of frequency multiplier circuit, thereby reach the purpose of dynamic adjustments loop load.
The protection domain of the utility model is as the criterion with claim, not limited by specific embodiment.
Claims (4)
1. the direct supply test unit is characterized in that alternating current is input to the interchange input filter circuit, exchanges input filter circuit and makes power supply and electric network electromagnet compatibility; With the alternating current input rectification circuit, become HVDC after the rectification circuit rectification after the filtering of interchange input filter circuit; Rectification circuit is imported PFC (PFC) circuit with HVDC, and pfc circuit becomes the voltage stabilizing direct current after proofreading and correct; Direct voltage of voltage regulation is input to the full-bridge phase-shifting resonance circuit, and transformer is operated in the high frequency state, and the pulse duty cycle of full-bridge phase-shifting resonance circuit adjustment transformer makes the output voltage stabilizing; Transformer secondary output outputs to the power supply outside through behind the current rectifying and wave filtering circuit.
2. direct supply test unit according to claim 1 is characterized in that described full-bridge phase-shifting resonance circuit controls the complete phase-shifting full-bridge master of two-way respectively through phased frequency multiplier circuit and change the loop, reaches frequency multiplication; Adjust two phase-shifting full-bridge masters through dynamic adjustment circuit and change the load current in loop, reach current-sharing output synchronous coordination.
3. direct supply test unit according to claim 2; It is characterized in that described phased frequency multiplier circuit with the UC3875 chip as the phase-shift soft switch main control chip; The UC3875 chip sends the fundamental frequency pwm signal of change-over circuit; The adjustable two-way pwm signal of phase angle that the controllable frequency multiplier circuit in dead band occurs frequently the pwm signal branch to differ, the two-way pwm signal is controlled two-way phase shift main circuit switch pipe respectively, reaches orderly conversion; Dynamically the adjustment circuit is the auxiliary winding through main conversion transformer, and the dynamic current ratio of sampling main-transformer changes, and through the dynamic adjustment of amplifier FEEDBACK CONTROL current-sharing electric current, influences the dead band adjustment of frequency multiplier circuit, thereby reaches the dynamic adjustments loop load.
4. direct supply test unit according to claim 1; The LR that it is characterized in that the phase shift Zero-voltage soft switch transducer of described full-bridge phase-shifting resonance circuit is made up of the leakage inductance of extra resonance inductance and transformer, CR by the stray capacitance of transformer with add electric capacity and form; Every driving pulse that switching tube has same widths in the phase shift Zero-voltage soft switch pipe transducer has source time through phase shift dislocation control, reaches regulated output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120198804 CN202102092U (en) | 2011-06-14 | 2011-06-14 | Direct-current power supply testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120198804 CN202102092U (en) | 2011-06-14 | 2011-06-14 | Direct-current power supply testing device |
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| Publication Number | Publication Date |
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| CN202102092U true CN202102092U (en) | 2012-01-04 |
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| CN 201120198804 Expired - Fee Related CN202102092U (en) | 2011-06-14 | 2011-06-14 | Direct-current power supply testing device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223074A (en) * | 2011-06-14 | 2011-10-19 | 辽宁省电力有限公司抚顺供电公司 | Tester of DC (direct current) power supply |
| CN103323788A (en) * | 2012-03-22 | 2013-09-25 | 鸿富锦精密工业(武汉)有限公司 | Power source testing system |
| CN104052079A (en) * | 2013-03-15 | 2014-09-17 | 余名俊 | Electric energy feedback type electronic load |
-
2011
- 2011-06-14 CN CN 201120198804 patent/CN202102092U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223074A (en) * | 2011-06-14 | 2011-10-19 | 辽宁省电力有限公司抚顺供电公司 | Tester of DC (direct current) power supply |
| CN102223074B (en) * | 2011-06-14 | 2013-09-11 | 辽宁省电力有限公司抚顺供电公司 | Tester of DC (direct current) power supply |
| CN103323788A (en) * | 2012-03-22 | 2013-09-25 | 鸿富锦精密工业(武汉)有限公司 | Power source testing system |
| CN104052079A (en) * | 2013-03-15 | 2014-09-17 | 余名俊 | Electric energy feedback type electronic load |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20120926 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120926 Address after: 113008 West Xinfu Road, Liaoning, Fushun, No. 13 Patentee after: Fushun Power Supply Company of Liaoning Electric Power Co., Ltd. Patentee after: State Grid Corporation of China Address before: 113008 West Xinfu Road, Liaoning, Fushun, No. 13 Patentee before: Fushun Power Supply Company of Liaoning Electric Power Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120104 Termination date: 20180614 |