CN203772967U - Three-phase current and unbalanced or default phase detection circuit - Google Patents
Three-phase current and unbalanced or default phase detection circuit Download PDFInfo
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- CN203772967U CN203772967U CN201420139579.5U CN201420139579U CN203772967U CN 203772967 U CN203772967 U CN 203772967U CN 201420139579 U CN201420139579 U CN 201420139579U CN 203772967 U CN203772967 U CN 203772967U
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Abstract
The utility model provides a three-phase current and unbalanced or default phase detection circuit. The circuit comprises a current sensor collecting a three-phase power supply current signal, a three-phase voltage division circuit, a three-phase filter circuit, an inverting input sum circuit, a forward voltage signal generation circuit, a negative voltage signal generation circuit, a forward voltage comparison circuit, a negative voltage comparison circuit and a light emitting diode indication circuit. Compared to an existing three-phase current and unbalanced or default phase detection circuit which combines software and hardware, by using the circuit of the utility model, the structure is simple and operation is convenient.
Description
Technical field
The present invention relates to a kind of three-phase current failure detector circuit, be specifically related to a kind of testing circuit that is applicable to detect three-phase current and imbalance or phase shortage.
Background technology
At present, the electric machine controller of electric automobile need to detect three-phase current fault, and most common failure comprises: overcurrent, phase shortage and electric current and imbalance.The electric machine controller of electric automobile is conventionally put above-mentioned several faults to be referred to as three-phase current fault together on the market, when fault occurs, cannot determine and be specially any fault.Three-phase current described in the prior art and imbalance or lack detection circuit adopt the processing mode of software and hardware combining mostly, the method that first adopts hardware rectification to set by software parameter again realizes measuring ability, with respect to its complex structure of testing circuit provided by the utility model, operate comparatively loaded down with trivial details.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of circuit structure simple, the three-phase current and imbalance or the lack detection circuit that adopt pure hardware approach to detect.
For addressing the above problem, the utility model provides a kind of three-phase current and imbalance or lack detection circuit, comprise the current sensor that gathers three-phase supply current signal, characterized by further comprising three-phase separate volt circuit, three-phase filter circuit, anti-phase input summing circuit, forward voltage signal generating circuit, negative voltage signal generating circuit, forward voltage comparator circuit, negative voltage comparator circuit and light emitting diode indicating circuit;
The output terminal of described current sensor is connected with the input end of anti-phase input summing circuit with three-phase filter circuit by three-phase separate volt circuit, the output terminal of anti-phase input summing circuit is connected with the inverting input of forward voltage comparator circuit and the in-phase input end of negative voltage comparator circuit, the output terminal of described forward voltage signal generating circuit is connected with the in-phase input end of forward voltage comparator circuit, and the output terminal of described negative voltage signal generating circuit is connected with the inverting input of negative voltage comparator circuit; The output terminal of described forward voltage comparer and reverse voltage comparer is connected with the negative pole of light emitting diode in light emitting diode indicating circuit respectively.
Concrete, each in described three-phase separate volt circuit is composed in series by two divider resistances.
Concrete, each in three-phase filter circuit is by resistance capacity filter and follower composition, and the output terminal of described resistance capacity filter is connected with the in-phase input end of follower.
The beneficial effects of the utility model are: the utility model provides a kind of three-phase current and imbalance or lack detection circuit, gather three-phase supply current signal output by current sensor, output signal is through bleeder circuit, after filtering circuit conditioning, sue for peace by anti-phase input summing circuit, after summation, the signal of output compares rear output by forward voltage comparator circuit and negative voltage comparator circuit and reference voltage signal, in the time of three-phase current and imbalance or open-phase fault generation, be output as low level, be that light emitting diode is lit, can detect easily three-phase current and imbalance or open-phase fault.The testing circuit of more existing software and hardware combining, the utility model circuit structure is more simple, operates also more convenient.
Brief description of the drawings
Be described in further detail below in conjunction with the specific embodiment of the present invention, wherein:
Fig. 1 is the circuit block diagram of a kind of three-phase current and imbalance or lack detection circuit;
Fig. 2 is the circuit theory diagrams of a kind of three-phase current and imbalance or lack detection circuit.
Embodiment
Shown in accompanying drawing 1-2, the utility model discloses a kind of three-phase current and imbalance or lack detection circuit, comprise the current sensor of a collection three-phase supply current signal, current sensor output terminal is connected with input end, the input end of V phase bleeder circuit and the input end of U phase bleeder circuit of W phase bleeder circuit respectively.W phase bleeder circuit is composed in series by R1 and R4, and V phase bleeder circuit is composed in series by R2 and R5, and U phase bleeder circuit is composed in series by R3 and R6.
W phase bleeder circuit, V phase bleeder circuit and U phase bleeder circuit three's output terminal is connected respectively input end, the input end of V phase filtering circuit and the input end of U phase filtering circuit of W phase filtering circuit.Described W phase filtering circuit comprises the resistance capacity filter and the follower U1C that are made up of resistance R 7 and capacitor C 1, and the output terminal of resistance capacity filter is connected with the in-phase input end of follower U1C; V phase filtering circuit comprises the resistance capacity filter and the follower U1B that are made up of resistance R 8 and capacitor C 2, and the output terminal of resistance capacity filter is connected with the in-phase input end of follower U1B; W phase filtering circuit comprises the resistance capacity filter and the follower U1A that are made up of resistance R 9 and capacitor C 3, and the output terminal of resistance capacity filter is connected with the in-phase input end of follower U1A;
W phase filtering circuit, V phase filtering circuit and U phase filtering circuit three's output terminal is connected with the reverse input end of amplifier U1D in anti-phase summation input circuit respectively, and the output terminal of amplifier U1D is connected with the inverting input of forward voltage comparer U2A and the in-phase input end of negative voltage comparer U2B respectively; The in-phase end access forward reference voltage signal u of forward voltage comparer U2A, end of oppisite phase is connected with a current-limiting resistance R15; End of oppisite phase access negative sense reference voltage signal-u of negative voltage comparer U2B, in-phase end is connected with a current-limiting resistance R16;
The output terminal of the output terminal of described forward voltage comparer U2A and negative voltage comparer U2B is connected with the negative pole of light emitting diode D1 respectively, and the positive pole of light emitting diode D1 connects power supply by current-limiting resistance R17.
When the utility model electric circuit inspection, the voltage signal W of current sensor output is carried out dividing potential drop by divider resistance R1, R4, then input follower U1C after resistance capacity filter filtering; The voltage signal V of current sensor output is carried out dividing potential drop by divider resistance R2, R5, then input follower U1B after resistance capacity filter filtering; The voltage signal U of current sensor output is carried out dividing potential drop by divider resistance R3, R6, then input follower U1A after resistance capacity filter filtering; Follower U1A output signal and follower U1B output signal and follower U1C output signal are sued for peace by anti-phase input summing circuit, through amplifier U1D output summing signal.In the time that summing signal is forward voltage signal, forward voltage comparer U2A compares rear output to signal and the forward reference voltage signal u of amplifier U1D output; In the time that summing signal is negative voltage signal, output signal and the negative sense reference voltage signal-u of negative voltage comparer U2B to amplifier U1D compares rear output; In the time that forward voltage comparer U2A or negative voltage comparer U2B are output as low level, light emitting diode D1 is lit, and can judge that three-phase current and imbalance or open-phase fault occur.
The above; only for the better embodiment of the present invention, but protection domain of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore protection domain of the present invention is as the criterion with the protection domain of claims.
Claims (3)
1. a three-phase current and imbalance or lack detection circuit, comprise the current sensor that gathers three-phase supply current signal, it is characterized in that: also comprise three-phase separate volt circuit, three-phase filter circuit, anti-phase input summing circuit, forward voltage signal generating circuit, negative voltage signal generating circuit, forward voltage comparator circuit, negative voltage comparator circuit and light emitting diode indicating circuit;
The output terminal of described current sensor is connected with the input end of anti-phase input summing circuit with three-phase filter circuit by three-phase separate volt circuit, the output terminal of anti-phase input summing circuit is connected with the inverting input of forward voltage comparator circuit and the in-phase input end of negative voltage comparator circuit, the output terminal of described forward voltage signal generating circuit is connected with the in-phase input end of forward voltage comparator circuit, and the output terminal of described negative voltage signal generating circuit is connected with the reverse input end of negative voltage comparator circuit; The output terminal of described forward voltage comparer and reverse voltage comparer is connected with the negative pole of light emitting diode in light emitting diode indicating circuit respectively.
2. a kind of three-phase current as claimed in claim 1 and imbalance or lack detection circuit, is characterized in that each in described three-phase separate volt circuit is composed in series by two divider resistances.
3. a kind of three-phase current as claimed in claim 1 and imbalance or lack detection circuit, it is characterized in that each in described three-phase filter circuit is by resistance capacity filter and follower composition, the output terminal of described resistance capacity filter is connected with the in-phase input end of follower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420139579.5U CN203772967U (en) | 2014-03-26 | 2014-03-26 | Three-phase current and unbalanced or default phase detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420139579.5U CN203772967U (en) | 2014-03-26 | 2014-03-26 | Three-phase current and unbalanced or default phase detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203772967U true CN203772967U (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420139579.5U Expired - Fee Related CN203772967U (en) | 2014-03-26 | 2014-03-26 | Three-phase current and unbalanced or default phase detection circuit |
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| CN (1) | CN203772967U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280599A (en) * | 2014-10-29 | 2015-01-14 | 国网四川省电力公司电力科学研究院 | Three-phase voltage signal detection alarm circuit |
| CN104569628A (en) * | 2014-12-30 | 2015-04-29 | 国家电网公司 | Remote alarm device for high voltage phase loss of distribution transformer |
| CN105301370A (en) * | 2015-08-31 | 2016-02-03 | 唐山松下产业机器有限公司 | Three-phase AC detection protection device and detection protection method therefor |
| TWI657255B (en) * | 2018-02-14 | 2019-04-21 | 台達電子工業股份有限公司 | Voltage detecting circuit |
| CN110932236A (en) * | 2019-11-08 | 2020-03-27 | 珠海格力电器股份有限公司 | Overcurrent open-phase detection protection circuit and method and compressor comprising circuit |
| US10794938B2 (en) | 2018-02-14 | 2020-10-06 | Delta Electronics, Inc. | Voltage detecting circuit |
-
2014
- 2014-03-26 CN CN201420139579.5U patent/CN203772967U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280599A (en) * | 2014-10-29 | 2015-01-14 | 国网四川省电力公司电力科学研究院 | Three-phase voltage signal detection alarm circuit |
| CN104280599B (en) * | 2014-10-29 | 2017-02-15 | 国网四川省电力公司电力科学研究院 | Three-phase voltage signal detection alarm circuit |
| CN104569628A (en) * | 2014-12-30 | 2015-04-29 | 国家电网公司 | Remote alarm device for high voltage phase loss of distribution transformer |
| CN105301370A (en) * | 2015-08-31 | 2016-02-03 | 唐山松下产业机器有限公司 | Three-phase AC detection protection device and detection protection method therefor |
| CN105301370B (en) * | 2015-08-31 | 2017-12-22 | 唐山松下产业机器有限公司 | Three-phase alternating-current powered detects protection device and its detection guard method |
| TWI657255B (en) * | 2018-02-14 | 2019-04-21 | 台達電子工業股份有限公司 | Voltage detecting circuit |
| US10794938B2 (en) | 2018-02-14 | 2020-10-06 | Delta Electronics, Inc. | Voltage detecting circuit |
| CN110932236A (en) * | 2019-11-08 | 2020-03-27 | 珠海格力电器股份有限公司 | Overcurrent open-phase detection protection circuit and method and compressor comprising circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20190326 |
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| CF01 | Termination of patent right due to non-payment of annual fee |