CN203376387U - Over-voltage detection circuit and PFC circuit using the same - Google Patents
Over-voltage detection circuit and PFC circuit using the same Download PDFInfo
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- CN203376387U CN203376387U CN201320354346.2U CN201320354346U CN203376387U CN 203376387 U CN203376387 U CN 203376387U CN 201320354346 U CN201320354346 U CN 201320354346U CN 203376387 U CN203376387 U CN 203376387U
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Abstract
The utility model relates to an over-voltage detection circuit and a power factor correction (PFC) circuit using the same. The over-voltage detection circuit comprises a comparator, a photoelectric coupler U1 and a PFC controller. A negative input terminal of the comparator is connected with an input terminal or output terminal of the PFC circuit by a voltage dividing module; a positive input terminal of the comparator is connected with a reference voltage Vref; an output terminal of the comparator is connected with a second terminal of a light-emitting component of the photoelectric coupler U1; and a first terminal of the light-emitting component is connected with a power supply. A first terminal of a photosensitive element of the photoelectric coupler U1 is connected with a power supply and a second terminal thereof is grounded; and an input terminal of the PFC controller is connected with the first terminal of the photosensitive element. The provided circuits are simple; a voltage follower is used for improving the anti-interference capability; and because of the comparator and the optocoupler, whether the PFC circuit is in an over-voltage state can be detected rapidly and accurately. Moreover, the PFC controller can stop controlling on the PFC circuit rapidly and the fault information can be reported, thereby avoiding the damage on the load element of the PFC circuit.
Description
Technical field
The utility model relates to a kind of testing circuit, particularly a kind of over-voltage detection circuit and apply the pfc circuit of this testing circuit.
Background technology
At present, in order to improve the utilization factor of electric energy, it is more and more that pfc circuit (Power Factor Correction, Active PFC) is used.Abnormal when the voltage appearance of pfc circuit input and output side, can cause the damage of electronic equipment, therefore, set up testing circuit and just seem and be even more important in pfc circuit.Usually the voltage detected can feed back to the input end of PFC chip, and the PFC chip is according to the magnitude of voltage of its feedback, and the control circuit voltage stabilization is in normal voltage range, thus the protection pfc circuit.But testing circuit of the prior art, mostly antijamming capability is poor, makes voltage that testing circuit is surveyed error and mistake occur.
The utility model content
The utility model fundamental purpose is to address the above problem and is not enough, provides a kind of circuit simple, and antijamming capability is strong, detects voltage a kind of over-voltage detection circuit and apply the pfc circuit of this testing circuit accurately.
For achieving the above object, the technical solution of the utility model is:
A kind of over-voltage detection circuit, comprise comparer, photoelectrical coupler U1 and pfc controller, the negative input end of described comparer is connected with input end or the output terminal of pfc circuit through division module, the positive input terminal of described comparer connects reference voltage Vref, the output terminal of described comparer is connected with the second end of the light-emitting component of photoelectrical coupler U1, the first end of described light-emitting component is connected with power supply, the first end of the light activated element of described photoelectrical coupler U1 is connected with power supply, the second end ground connection, the input end of described pfc controller connects the first end of described light activated element.
Further, light-emitting component is light emitting diode D1, and its first end and the second end are respectively anode and the negative electrode of light emitting diode D1.
Further, light activated element is phototriode Q1, and its first end and the second end are respectively the collector and emitter of phototriode Q1.
Further, also comprise voltage follower, the negative input end of described comparer is connected with the output terminal of described voltage follower by resistance R 1, the first input end of described voltage follower is connected with input end or the output terminal of pfc circuit by division module, and the second input end of described voltage follower is connected with the output terminal of voltage follower.
Further, parallel diode D2 and diode D3 between the positive input terminal of described comparer and negative input end, the anode of described diode D2 is connected with the negative input end of described comparer, negative electrode is connected with the positive input terminal of described comparer, the anode of described diode D3 is connected with the positive input terminal of described comparer, and negative electrode is connected with the negative input end of described comparer.
Further, the output terminal of comparer is connected with the negative electrode of light emitting diode D1 by resistance R 5, in parallel with resistance R 6 after described light emitting diode D1 and resistance R 5 series connection.
Further, the collector of phototriode Q1 is connected with power supply by resistance R 7.
A kind of pfc circuit, comprise above-mentioned a kind of over-voltage detection circuit.
Content to sum up, a kind of over-voltage detection circuit described in the utility model and apply the pfc circuit of this testing circuit, circuit is simple, improve antijamming capability by voltage follower, by comparer and optocoupler, whether overvoltage of pfc circuit can be detected fast and accurately, and pfc controller can stop the control for pfc circuit fast, and quote fault, avoid the damage to the pfc circuit load elements.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
As shown in Figure 1, comparer 1, voltage follower 2, division module 3, reference circuit 4.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:
As shown in Figure 1, a kind of over-voltage detection circuit, be mainly used in input terminal voltage and the output end voltage of pfc circuit are detected, and when the pfc circuit input end is lived the output end voltage overvoltage, pfc controller stops PFC output to be controlled, and quotes fault.
Over-voltage detection circuit mainly comprises comparer 1, voltage follower 2, division module 3, reference circuit 4, photoelectrical coupler U1 and pfc controller.
The negative input end of comparer 1 is connected with the output terminal of voltage follower 2 by resistance R 1, the first input end of voltage follower 2 is after division module 3, with input end or the output terminal of pfc circuit, be connected, detect the voltage of pfc circuit input end or output terminal, the second input end of voltage follower 2 is connected with the output terminal of voltage follower 2.
Division module 3 is carried out dividing potential drop for the voltage of the input end to pfc circuit or output terminal, and making the voltage that over-voltage detection circuit detects is less voltage, does not damage voltage follower 2, comparer 1 and pfc controller etc.Division module 3 comprises resistance R 8 and resistance R 9, and the input end of pfc circuit or output terminal be resistance in series R8 and the rear ground connection of resistance R 9 successively, and the first input end of voltage follower 2 is connected to the common port of resistance R 8 and resistance R 9.
The positive input terminal of comparer 1 connects the reference voltage Vref of reference circuit 4 by resistance R 4, reference circuit 4 comprises resistance R 2 and resistance R 3, an end ground connection of resistance R 2, other end contact resistance R3, the other end of resistance R 3 connects power supply, and the common port of resistance R 2 and resistance R 3 is reference voltage Vref.The setting of the magnitude of voltage of reference voltage Vref, the magnitude of voltage that the maximal value allowed according to pfc circuit input end or output end voltage obtains after division module 3 dividing potential drops and setting, for example, the maximal value that the pfc circuit output terminal allows is 320V, the voltage of 320V is after division module 3 dividing potential drops, the magnitude of voltage that voltage follower 2 first input ends detect is 6V, the magnitude of voltage of reference voltage Vref also should be set as 6V, when the pfc circuit output end voltage surpasses 320V, the magnitude of voltage that voltage follower 2 first input ends detect also surpasses 6V, be greater than reference voltage Vref, now, the output level of comparer 1 output terminal changes.
Parallel diode D2 and diode D3 between the positive input terminal of comparer 1 and negative input end, the anode of diode D2 is connected with the negative input end of comparer 1, negative electrode is connected with the positive input terminal of comparer 1, the anode of diode D3 is connected with the positive input terminal of comparer 1, and negative electrode is connected with the negative input end of comparer 1.Diode D2 and D3 are set, for the protection of protection comparer 1.
Photoelectrical coupler U1 comprises light-emitting component and light activated element, and light-emitting component is light emitting diode D1, and light activated element is phototriode Q1.The output terminal of comparer 1 is connected with the negative electrode of the light emitting diode D1 of photoelectrical coupler U1 by resistance R 5, the anode of light emitting diode D1 is connected with power supply, the collector of the phototriode Q1 of photoelectrical coupler U1 is connected with power supply by resistance R 7, grounded emitter, in parallel with resistance R 6 after light emitting diode D1 and resistance R 5 series connection.Resistance R 5, resistance R 6, resistance R 7 all play the protective effect to photoelectrical coupler U1.The input end of pfc controller is connected with the collector of phototriode Q1, whether detects photoelectrical coupler U1 conducting.
The input end of pfc circuit or output end voltage are after dividing potential drop, through the first input end of voltage follower 2 to output terminal, be transferred to the negative input end of comparer 1, the positive input terminal of comparer 1 connects reference voltage Vref, size by comparison reference voltage Vref and pfc circuit input end or output end voltage, output terminal at comparer 1 sends high level or low level, if reference voltage Vref is high, export high level, the not conducting of light emitting diode D1 of photoelectrical coupler U1, not conducting of phototriode Q1, pfc controller detects as high level, pfc circuit input end or output end voltage are normal, if reference voltage Vref is lower than comparer 1 negative input end value, comparer 1 output terminal output low level, the light emitting diode D1 conducting of photoelectrical coupler U1, also conducting of phototriode Q1, pfc controller detects as low level, the input end of pfc circuit or output terminal overvoltage, pfc controller stops PFC and controls output, and quotes fault.When the detection voltage for different, the resistance R 2 in capable of regulating reference circuit 4 and the resistance of R3, thus adjust reference voltage Vref, make this programme over-voltage detection circuit can detect the pfc circuit of various different voltages, be conducive to improve versatility, cost-saving.
A kind of pfc circuit, mainly comprise input terminal voltage, output end voltage, power tube, inductance etc., is low tension to be converted into to a kind of circuit of high-tension electricity, at input end or output terminal, above-mentioned over-voltage detection circuit is set, and pfc circuit is protected.
As mentioned above, given scheme content, can derive similar technical scheme by reference to the accompanying drawings.In every case be the content that does not break away from technical solutions of the utility model, any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (8)
1. an over-voltage detection circuit, it is characterized in that: comprise comparer, photoelectrical coupler U1 and pfc controller, the negative input end of described comparer is connected with input end or the output terminal of pfc circuit through division module, the positive input terminal of described comparer connects reference voltage Vref, the output terminal of described comparer is connected with the second end of the light-emitting component of photoelectrical coupler U1, the first end of described light-emitting component is connected with power supply, the first end of the light activated element of described photoelectrical coupler U1 is connected with power supply, the second end ground connection, the input end of described pfc controller connects the first end of described light activated element.
2. a kind of over-voltage detection circuit according to claim 1, it is characterized in that: described light-emitting component is light emitting diode D1, its first end and the second end are respectively anode and the negative electrode of light emitting diode D1.
3. a kind of over-voltage detection circuit according to claim 1, it is characterized in that: described light activated element is phototriode Q1, its first end and the second end are respectively the collector and emitter of phototriode Q1.
4. a kind of over-voltage detection circuit according to claim 1, it is characterized in that: also comprise voltage follower, the negative input end of described comparer is connected with the output terminal of described voltage follower by resistance R 1, the first input end of described voltage follower is connected with input end or the output terminal of pfc circuit by division module, and the second input end of described voltage follower is connected with the output terminal of voltage follower.
5. a kind of over-voltage detection circuit according to claim 1, it is characterized in that: parallel diode D2 and diode D3 between the positive input terminal of described comparer and negative input end, the anode of described diode D2 is connected with the negative input end of described comparer, negative electrode is connected with the positive input terminal of described comparer, the anode of described diode D3 is connected with the positive input terminal of described comparer, and negative electrode is connected with the negative input end of described comparer.
6. a kind of over-voltage detection circuit according to claim 2 is characterized in that: the output terminal of described comparer is connected with the negative electrode of light emitting diode D1 by resistance R 5, and described light emitting diode D1 and resistance R 5 are connected in parallel with resistance R 6 afterwards.
7. a kind of over-voltage detection circuit according to claim 3 is characterized in that: the collector of described phototriode Q1 is connected with power supply by resistance R 7.
8. a pfc circuit, is characterized in that: comprise a kind of over-voltage detection circuit as described as claim 1 to 7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320354346.2U CN203376387U (en) | 2013-06-19 | 2013-06-19 | Over-voltage detection circuit and PFC circuit using the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320354346.2U CN203376387U (en) | 2013-06-19 | 2013-06-19 | Over-voltage detection circuit and PFC circuit using the same |
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| CN203376387U true CN203376387U (en) | 2014-01-01 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020344A (en) * | 2014-06-24 | 2014-09-03 | 新誉集团有限公司 | Front-stage overvoltage detection device for railway passenger car |
| CN104779584A (en) * | 2014-01-14 | 2015-07-15 | 易泰帝传动技术(烟台)有限公司 | Frequency changer detection protection circuit |
| CN106711921A (en) * | 2015-11-16 | 2017-05-24 | 中车大连电力牵引研发中心有限公司 | Power supply management circuit for urban rail vehicle control unit |
| CN107069655A (en) * | 2017-06-06 | 2017-08-18 | 吉林省中赢高科技有限公司 | A kind of voltage protection circuit |
| CN107276406A (en) * | 2017-07-14 | 2017-10-20 | 惠州拓邦电气技术有限公司 | A kind of overvoltage regulating circuit |
| CN107611934A (en) * | 2017-09-26 | 2018-01-19 | 深圳市华星光电技术有限公司 | USB interface protection circuit and display device |
| CN109387296A (en) * | 2018-10-29 | 2019-02-26 | 许继集团有限公司 | A kind of temperature sensing circuit |
| CN109738671A (en) * | 2018-12-07 | 2019-05-10 | 武汉航空仪表有限责任公司 | A kind of acceleration transducer self-checking circuit |
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2013
- 2013-06-19 CN CN201320354346.2U patent/CN203376387U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779584A (en) * | 2014-01-14 | 2015-07-15 | 易泰帝传动技术(烟台)有限公司 | Frequency changer detection protection circuit |
| CN104020344A (en) * | 2014-06-24 | 2014-09-03 | 新誉集团有限公司 | Front-stage overvoltage detection device for railway passenger car |
| CN104020344B (en) * | 2014-06-24 | 2016-05-25 | 新誉集团有限公司 | Prime overvoltage checkout gear for trolley coach |
| CN106711921A (en) * | 2015-11-16 | 2017-05-24 | 中车大连电力牵引研发中心有限公司 | Power supply management circuit for urban rail vehicle control unit |
| CN106711921B (en) * | 2015-11-16 | 2019-04-26 | 中车大连电力牵引研发中心有限公司 | The electric power management circuit of city rail vehicle control unit |
| CN107069655A (en) * | 2017-06-06 | 2017-08-18 | 吉林省中赢高科技有限公司 | A kind of voltage protection circuit |
| CN107069655B (en) * | 2017-06-06 | 2020-11-27 | 吉林省中赢高科技有限公司 | Voltage protection circuit |
| CN107276406A (en) * | 2017-07-14 | 2017-10-20 | 惠州拓邦电气技术有限公司 | A kind of overvoltage regulating circuit |
| CN107611934A (en) * | 2017-09-26 | 2018-01-19 | 深圳市华星光电技术有限公司 | USB interface protection circuit and display device |
| CN109387296A (en) * | 2018-10-29 | 2019-02-26 | 许继集团有限公司 | A kind of temperature sensing circuit |
| CN109738671A (en) * | 2018-12-07 | 2019-05-10 | 武汉航空仪表有限责任公司 | A kind of acceleration transducer self-checking circuit |
| CN109738671B (en) * | 2018-12-07 | 2021-04-23 | 武汉航空仪表有限责任公司 | Acceleration sensor self-checking circuit |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140101 |
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| CU01 | Correction of utility model | ||
| CU01 | Correction of utility model |
Correction item: Termination upon expiration of patent Correct: Revocation of Patent Expiration and Termination False: On July 7, 2023, the expiration and termination of the 39 volume 2702 patent Number: 27-02 Volume: 39 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140101 |