CN105932636A - Overcurrent protection circuit of power-frequency withstand voltage test - Google Patents
Overcurrent protection circuit of power-frequency withstand voltage test Download PDFInfo
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- CN105932636A CN105932636A CN201610410113.8A CN201610410113A CN105932636A CN 105932636 A CN105932636 A CN 105932636A CN 201610410113 A CN201610410113 A CN 201610410113A CN 105932636 A CN105932636 A CN 105932636A
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- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Abstract
This invention relates to an overcurrent protection circuit of power-frequency withstand voltage test. The overcurrent protection circuit is composed of a micro current transformer CT2, resistors R1-R2, capacitors C1-C3, operational amplifiers OP1-OP2, diodes D1-D3, a relay CJ, an adjustable resistor W1, a diode LED1 (Light-Emitting Diode), a switch K1 and a triode Q1. The overcurrent protection circuit provided by the invention has simple and reasonable structural design, high sensitivity, small volume, easy adjustment and high reliability, and is applicable to the protection of the power-frequency withstand voltage.
Description
Technical field
The invention belongs to technical field of electric power detection, be specifically related to a kind of industrial frequency withstand voltage test current foldback circuit.
Background technology
Industrial frequency withstand voltage test is the pilot project that power equipment is general, and it is a tolerance test project, can be examined the dielectric strength of power equipment by this project.
Process of the test is to apply the power-frequency voltage of standard-required on test specimen, and continues 60 second time, occurs without and puncture flashover in process of the test, has i.e. passed through detection, it is determined that for qualified.Owing to being tolerance test, if dielectric strength is inadequate in process of the test, arise that insulation breakdown or flashover.After insulation breakdown, testing transformer high pressure, by direct shorted to earth, can produce bigger short circuit current.If long-time short circuit can cause test product wound face to expand, even can destructive test equipment.In order to protect test product and equipment, need to install additional protective resistance, limiting short-circuit current, configure current foldback circuit simultaneously, cut off hookup when being short-circuited.
Generally industrial frequency withstand voltage test protection circuit employing electric current relay is as overcurrent protection original paper, but it exists, and volume is big, sensitivity is low, be not easy to the shortcomings such as regulation, is increasingly not suitable with technology development need.
Summary of the invention
For the problems referred to above, it is simple, rationally that the present invention proposes the design of a kind of structure, have highly sensitive, volume is little, be easy to the feature of regulation, has the industrial frequency withstand voltage test current foldback circuit of high reliability simultaneously.
Technical scheme is as follows:
Above-mentioned industrial frequency withstand voltage test current foldback circuit, it is connected formed by micro-transformer of current CT2, resistance R1 ~ R11, electric capacity C1 ~ C3, operational amplifier OP1 ~ OP2, diode D1 ~ D3, relay CJ, adjustable resistance W1, diode (LED) 1, switch K1 and audion Q1；Described micro-transformer of current CT2 one end connects the in-phase input end of described operational amplifier OP1, described micro-transformer of current CT2 other end ground connection the inverting input by the described resistance R3 described operational amplifier OP1 of connection by described resistance R2；Described resistance R1 and electric capacity C1 is all parallel to described micro-transformer of current CT2 two ends；Described resistance R4 one end ground connection, the other end is connected to the inverting input of described operational amplifier OP1；The anode tap of described diode D1 is connected to the outfan of described operational amplifier OP1, and cathode terminal is sequentially connected with described resistance R6 and R8 and is connected to the in-phase input end of described operational amplifier OP2 by described resistance R6 and R8；Described resistance R5 one end is connected to the in-phase input end of described operational amplifier OP1, and the other end is connected to the junction point of described resistance R6 and R8；Described electric capacity C2 one end ground connection, the other end is connected to the junction point of described resistance R6 and R8；Coil one end ground connection of described adjustable resistance W1, the coil other end of described adjustable resistance W1 connects+12V power supply by described resistance R7, and the slide plate of described adjustable resistance W1 is connected to the inverting input of described operational amplifier OP2；Described electric capacity C3 one end ground connection, the other end is connected to the inverting input of described operational amplifier OP2；Described switch K1 one end ground connection, the other end is connected to the in-phase input end of described operational amplifier OP2；The outfan of described operational amplifier OP2 is connected to the base stage of described audion Q1 by described resistance R10；The anode tap of described diode D2 is connected to the outfan of described operational amplifier OP2, and cathode terminal is connected to the in-phase input end of described operational amplifier OP2 by described resistance R9；Described relay CJ one end connects+12V power supply, and the other end connects the colelctor electrode of described audion Q1；The grounded emitter of described audion Q1；The anode tap of described diode D3 is connected to the colelctor electrode of described audion Q1, and cathode terminal connects+12V power supply；The anode tap of described diode (LED) 1 connects+12V power supply, and cathode terminal connects the colelctor electrode of described audion Q1 by described resistance R11.
Described industrial frequency withstand voltage test current foldback circuit, wherein: described audion Q1 is NPN type triode.
Described industrial frequency withstand voltage test current foldback circuit, wherein: described operational amplifier OP2 constitutes positive-feedback circuit by described diode D2 and resistance R9.
Beneficial effect:
Industrial frequency withstand voltage of the present invention test current foldback circuit structure design is simple, rationally; overcurrent protection electric current uses current sample, amplification, precision rectifying detection, signal compares, the workflow of lock-up relay output is designed; it is applicable to industrial frequency withstand voltage protection use; have highly sensitive, volume is little, be easy to regulation feature, there is high reliability simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of industrial frequency withstand voltage of the present invention test current foldback circuit.
Detailed description of the invention
As shown in Figure 1; industrial frequency withstand voltage of the present invention test current foldback circuit, is connected formed by micro-transformer of current CT2, resistance R1 ~ R11, electric capacity C1 ~ C3, operational amplifier OP1 ~ OP2, diode D1 ~ D3, relay CJ, adjustable resistance W1, diode (LED) 1, switch K1 and audion Q1.
This micro-transformer of current CT2 one end connects resistance R2 and by the in-phase input end of resistance R2 concatenation operation amplifier OP1, and this micro-transformer of current CT2 other end ground connection also passes through the inverting input of resistance R3 concatenation operation amplifier OP1；This resistance R1 is parallel to micro-transformer of current CT2 two ends；Electric capacity C1 is also parallel to micro-transformer of current CT2 two ends；Resistance R4 one end ground connection, the other end is connected to the inverting input of operational amplifier OP1；The anode tap of diode D1 is connected to the outfan of operational amplifier OP1, and cathode terminal is sequentially connected with resistance R6, resistance R8 and is connected to the in-phase input end of operational amplifier OP2 by resistance R6, R8；Resistance R5 one end is connected to the in-phase input end of operational amplifier OP1, and the other end is connected to resistance R6 and the junction point of resistance R8；Electric capacity C2 one end ground connection, the other end is connected to resistance R6 and the junction point of resistance R8；Coil one end ground connection of adjustable resistance W1, the coil other end of adjustable resistance W1 connects resistance R7 and connects+12V power supply by resistance R7, and the slide plate of adjustable resistance W1 is connected to the inverting input of operational amplifier OP2；Electric capacity C3 one end ground connection, the other end is connected to the inverting input of operational amplifier OP2；Switch K1 one end ground connection, the other end is connected to the in-phase input end of operational amplifier OP2；The outfan of operational amplifier OP2 is connected resistance R10 and is connected to the base stage of audion Q1 by resistance R10；The anode tap of diode D2 is connected to the outfan of operational amplifier OP2, and cathode terminal is connected resistance R9 and is connected to the in-phase input end of operational amplifier OP2 by resistance R9；Relay CJ one end connects+12V power supply, the colelctor electrode of other end connecting triode Q1；The grounded emitter of audion Q1；The anode tap of diode D3 is connected to the colelctor electrode of audion Q1, and cathode terminal connects+12V power supply；The anode tap of diode (LED) 1 connects+12V power supply, and cathode terminal connects resistance R11 and by the colelctor electrode of resistance R11 connecting triode Q1；Wherein, this audion Q1 is NPN type triode, and this resistance R11 uses as current-limiting resistance in current foldback circuit, and this operational amplifier OP2 be also comparator.
The operation principle of the present invention:
Micro-transformer of current CT2 secondary current samples on resistance R1 and is converted to voltage, filters through electric capacity C1, is amplified by operational amplifier OP1, and amplification is determined by resistance R2 and R5；Signal passes through diode D1, resistance R6, electric capacity C2 precision rectifying, and resistance R5 feedback signal directly takes from electric capacity C2 can cut diode D1, the resistance R6 pressure drop impact on commutating voltage；The in-phase input end that signal enters operational amplifier OP2 through resistance R8 compares, resistance R7, adjustable resistance W1 bleeder circuit constitute adjustable normal voltage and remove to be coupled into the reverse input end of operational amplifier OP2 through electric capacity C3；After collection current signal detecting circuit exceedes established standards voltage, operational amplifier OP2 output high level drives NPN type triode Q1 to turn on by resistance R10, and relay CJ adhesive sends signal cut test loop；Diode (LED) 1 obtains electric lighting by resistance R11 simultaneously, shows overcurrent protection；Operational amplifier OP2 constitutes positive feedback by diode D2, resistance R9; can lock operational amplifier OP2 during overcurrent protection is high level; ensure the reliable adhesive of relay CJ; protection overcurrent protection state simultaneously; protection lock-out state can be dragged down the input level in the same direction of operational amplifier OP2 by Guan Bi switch K1, made operational amplifier reset; return to original state, protect next time.
Present configuration design is simple, rationally, have highly sensitive, volume is little, be easy to the feature of regulation, has high reliability simultaneously, it is adaptable to industrial frequency withstand voltage protection uses.
Claims (3)
1. an industrial frequency withstand voltage test current foldback circuit, it is characterised in that: described current foldback circuit is connected formed by micro-transformer of current CT2, resistance R1 ~ R11, electric capacity C1 ~ C3, operational amplifier OP1 ~ OP2, diode D1 ~ D3, relay CJ, adjustable resistance W1, diode (LED) 1, switch K1 and audion Q1；
Described micro-transformer of current CT2 one end connects the in-phase input end of described operational amplifier OP1, described micro-transformer of current CT2 other end ground connection the inverting input by the described resistance R3 described operational amplifier OP1 of connection by described resistance R2；Described resistance R1 and electric capacity C1 is all parallel to described micro-transformer of current CT2 two ends；Described resistance R4 one end ground connection, the other end is connected to the inverting input of described operational amplifier OP1；The anode tap of described diode D1 is connected to the outfan of described operational amplifier OP1, and cathode terminal is sequentially connected with described resistance R6 and R8 and is connected to the in-phase input end of described operational amplifier OP2 by described resistance R6 and R8；Described resistance R5 one end is connected to the in-phase input end of described operational amplifier OP1, and the other end is connected to the junction point of described resistance R6 and R8；Described electric capacity C2 one end ground connection, the other end is connected to the junction point of described resistance R6 and R8；Coil one end ground connection of described adjustable resistance W1, the coil other end of described adjustable resistance W1 connects+12V power supply by described resistance R7, and the slide plate of described adjustable resistance W1 is connected to the inverting input of described operational amplifier OP2；Described electric capacity C3 one end ground connection, the other end is connected to the inverting input of described operational amplifier OP2；Described switch K1 one end ground connection, the other end is connected to the in-phase input end of described operational amplifier OP2；The outfan of described operational amplifier OP2 is connected to the base stage of described audion Q1 by described resistance R10；The anode tap of described diode D2 is connected to the outfan of described operational amplifier OP2, and cathode terminal is connected to the in-phase input end of described operational amplifier OP2 by described resistance R9；Described relay CJ one end connects+12V power supply, and the other end connects the colelctor electrode of described audion Q1；The grounded emitter of described audion Q1；The anode tap of described diode D3 is connected to the colelctor electrode of described audion Q1, and cathode terminal connects+12V power supply；The anode tap of described diode (LED) 1 connects+12V power supply, and cathode terminal connects the colelctor electrode of described audion Q1 by described resistance R11.
2. industrial frequency withstand voltage test current foldback circuit as claimed in claim 1, it is characterised in that: described audion Q1 is NPN type triode.
3. industrial frequency withstand voltage test current foldback circuit as claimed in claim 1, it is characterised in that: described operational amplifier OP2 constitutes positive-feedback circuit by described diode D2 and resistance R9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610410113.8A CN105932636A (en) | 2016-06-13 | 2016-06-13 | Overcurrent protection circuit of power-frequency withstand voltage test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610410113.8A CN105932636A (en) | 2016-06-13 | 2016-06-13 | Overcurrent protection circuit of power-frequency withstand voltage test |
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| CN105932636A true CN105932636A (en) | 2016-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610410113.8A Pending CN105932636A (en) | 2016-06-13 | 2016-06-13 | Overcurrent protection circuit of power-frequency withstand voltage test |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786390A (en) * | 2017-02-20 | 2017-05-31 | 广东美的制冷设备有限公司 | Compressor protective circuit and air-conditioner |
| CN106793230A (en) * | 2017-01-25 | 2017-05-31 | 苏州振湖电炉有限公司 | The current foldback circuit of induction furnace induction coil |
| CN106849015A (en) * | 2017-02-20 | 2017-06-13 | 广东美的制冷设备有限公司 | A kind of compressor protective circuit and air-conditioner |
| CN106961095A (en) * | 2017-05-12 | 2017-07-18 | 广东美的制冷设备有限公司 | Current foldback circuit and air-conditioner |
| CN108336715A (en) * | 2017-12-21 | 2018-07-27 | 长沙拓扑陆川新材料科技有限公司 | A kind of current foldback circuit |
| CN108387829A (en) * | 2017-08-29 | 2018-08-10 | 苏州华电电气技术服务有限公司 | A kind of industrial frequency withstand voltage test device |
| CN114006354A (en) * | 2021-09-16 | 2022-02-01 | 北京无线电测量研究所 | Overcurrent protection circuit |
| CN115954836A (en) * | 2023-03-13 | 2023-04-11 | 电信科学技术第五研究所有限公司 | Power hot plug protection circuit of board card equipment based on current transformer |
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| CN2055302U (en) * | 1989-09-26 | 1990-03-28 | 天津市医疗器械研究所 | Medical two-direction micro current excess-current protector |
| US20060133000A1 (en) * | 2004-12-20 | 2006-06-22 | Hiroyuki Kimura | Overcurrent protection circuit and DC power supply |
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2016
- 2016-06-13 CN CN201610410113.8A patent/CN105932636A/en active Pending
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793230A (en) * | 2017-01-25 | 2017-05-31 | 苏州振湖电炉有限公司 | The current foldback circuit of induction furnace induction coil |
| CN106793230B (en) * | 2017-01-25 | 2023-02-07 | 苏州振湖电炉有限公司 | Overcurrent protection circuit of induction furnace induction coil |
| CN106786390A (en) * | 2017-02-20 | 2017-05-31 | 广东美的制冷设备有限公司 | Compressor protective circuit and air-conditioner |
| CN106849015A (en) * | 2017-02-20 | 2017-06-13 | 广东美的制冷设备有限公司 | A kind of compressor protective circuit and air-conditioner |
| WO2018149031A1 (en) * | 2017-02-20 | 2018-08-23 | 广东美的制冷设备有限公司 | Compressor protecting circuit and air conditioner |
| WO2018149034A1 (en) * | 2017-02-20 | 2018-08-23 | 广东美的制冷设备有限公司 | Compressor protection circuit and air conditioner |
| CN106961095A (en) * | 2017-05-12 | 2017-07-18 | 广东美的制冷设备有限公司 | Current foldback circuit and air-conditioner |
| CN106961095B (en) * | 2017-05-12 | 2019-02-12 | 广东美的制冷设备有限公司 | Current foldback circuit and air conditioner |
| CN108387829A (en) * | 2017-08-29 | 2018-08-10 | 苏州华电电气技术服务有限公司 | A kind of industrial frequency withstand voltage test device |
| CN108336715A (en) * | 2017-12-21 | 2018-07-27 | 长沙拓扑陆川新材料科技有限公司 | A kind of current foldback circuit |
| CN114006354A (en) * | 2021-09-16 | 2022-02-01 | 北京无线电测量研究所 | Overcurrent protection circuit |
| CN115954836A (en) * | 2023-03-13 | 2023-04-11 | 电信科学技术第五研究所有限公司 | Power hot plug protection circuit of board card equipment based on current transformer |
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Application publication date: 20160907 |
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