CN102435821B - Detection method of three-phase inverter output line voltage - Google Patents
Detection method of three-phase inverter output line voltage Download PDFInfo
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- CN102435821B CN102435821B CN201110393989.3A CN201110393989A CN102435821B CN 102435821 B CN102435821 B CN 102435821B CN 201110393989 A CN201110393989 A CN 201110393989A CN 102435821 B CN102435821 B CN 102435821B
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- resistance
- photoelectrical coupler
- operational amplifier
- phase inverter
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Abstract
The invention relates to the three-phase inverter output line voltage detection technology, concretely relating to a detection device of three-phase inverter output line voltage. A common switching mode optoelectronic coupler and a resistance dividing potential drop unit are employed to form a three-phase inverter output line voltage detection circuit to detect the three-phase inverter output line voltage. The three-phase inverter output line voltage detection circuit comprises the resistance dividing potential drop unit between output terminals of a three-phase inverter, the optoelectronic coupler and a filtering amplification circuit at a secondary edge of the optoelectronic coupler. The device in the invention is very suitable for detection of a PWM voltage waveform and has the advantages of photoelectric isolation, low cost, high response speed and capability of satisfying a requirement of three-phase inverter output line voltage detection.
Description
Technical field
The present invention relates to three-phase inverter output line voltage detection technique, is a kind of three-phase inverter output line voltage pick-up unit specifically.Be particularly related to and a kind ofly need to carry out phase-locked testing circuit to the frequency of three-phase inverter output line voltage.
Background technology
In some application of three-phase inverter, require output three-phase alternating current line voltage to detect in real time, to realize the needs of control, existing method has three kinds substantially:
1, carry out difference sampling with mega-ohms resistance and operational amplifier; The method cost is low, but mega-ohms resistance is too many, and response speed is slow.
2, sample with precision photoelectric coupler; Response speed is very fast, but cost is high.
3, use Hall voltage sensor sample; Response speed is very fast, but cost is high.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of three-phase inverter output line voltage pick-up unit, be applicable to very much detecting PWM(pulse-length modulation, be called for short width modulation) voltage waveform, and there is photoelectricity isolation, cost is lower, and response speed is very fast, meets the needs that three-phase inverter output line voltage is detected.
For reaching above object, the technical scheme that the present invention takes is:
A kind of three-phase inverter output line voltage pick-up unit, is characterized in that: adopt regular tap type photoelectrical coupler and electric resistance partial pressure unit composition three-phase inverter output line voltage testing circuit to detect three-phase inverter output line voltage.
On the basis of technique scheme, described three-phase inverter output line voltage testing circuit comprises:
Be connected to electric resistance partial pressure unit, photoelectrical coupler, the filter amplification circuit of photoelectrical coupler secondary and the signal transformation circuit of rear class between three-phase inverter output phase voltage U and output phase voltage V;
Be connected to electric resistance partial pressure unit, photoelectrical coupler, the filter amplification circuit of photoelectrical coupler secondary and the signal transformation circuit of rear class between three-phase inverter output phase voltage V and output phase voltage W.
On the basis of technique scheme, the electric resistance partial pressure unit between described three-phase inverter output phase voltage U and output phase voltage V comprises resistance R 1 and resistance R 2,
Resistance R 1 is connected between output phase voltage U and the positive input terminal of photoelectrical coupler U2,
Resistance R 2 is connected between output phase voltage V and the negative input end of photoelectrical coupler U2,
The positive input terminal of photoelectrical coupler U1 is connected with the negative input end of photoelectrical coupler U2 simultaneously, and the negative input end of photoelectrical coupler U1 is connected with the positive input terminal of photoelectrical coupler U2;
Photoelectrical coupler U1 secondary, photoelectrical coupler U2 secondary are respectively equipped with filter amplification circuit,
The filter amplification circuit of described photoelectrical coupler U1 secondary comprises: biasing resistor R5, R6, and the prime filtering circuit being formed by resistance R 7, capacitor C 1, also comprise operational amplifier U5,
The filter amplification circuit of described photoelectrical coupler U2 secondary comprises: biasing resistor R8, R9, and the prime filtering circuit being made up of resistance R 10, capacitor C 2, also comprise operational amplifier U6;
Operational amplifier U5 rear class, operational amplifier U6 rear class are connected with signal transformation circuit,
The signal transformation circuit of described operational amplifier U5 and operational amplifier U6 rear class comprises:
Resistance R 11, R13, R14, R12, R15, and operational amplifier U9,
After operational amplifier U9, be provided with the filtering circuit being formed by resistance R 16, capacitor C 3;
Electric resistance partial pressure unit between described three-phase inverter output phase voltage V and output phase voltage W comprises resistance R 3 and resistance R 4,
Resistance R 3 is connected between output phase voltage V and the positive input terminal of photoelectrical coupler U4,
Resistance R 4 is connected between output phase voltage W and the negative input end of photoelectrical coupler U4,
The positive input terminal of photoelectrical coupler U3 is connected with the negative input end of photoelectrical coupler U4 simultaneously, and the negative input end of photoelectrical coupler U3 is connected with the positive input terminal of photoelectrical coupler U4;
Photoelectrical coupler U3 secondary, photoelectrical coupler U4 secondary are respectively equipped with filter amplification circuit,
The filter amplification circuit of described photoelectrical coupler U3 secondary comprises: biasing resistor R17, R18, and the prime filtering circuit being formed by resistance R 19, capacitor C 4, also comprise operational amplifier U7,
The filter amplification circuit of described photoelectrical coupler U4 secondary comprises: biasing resistor R20, R21, and the prime filtering circuit being made up of resistance R 22, capacitor C 5, also comprise operational amplifier U8;
Operational amplifier U7 rear class, operational amplifier U8 rear class are connected with signal transformation circuit,
The signal transformation circuit of described operational amplifier U7 and operational amplifier U8 rear class comprises:
Resistance R 23, R25, R26, R24, R27, and operational amplifier U10,
After operational amplifier U10, be provided with the filtering circuit being formed by resistance R 28, capacitor C 6.
On the basis of technique scheme, the resistance parameter in described circuit meets following relation:
R11=R12，R13//R14=R15；
R23=R24，R25//R26=R27。
On the basis of technique scheme, the resistance R 1 in electric resistance partial pressure unit, R2, R3, R4 are all made up of a resistance at least respectively.
Three-phase inverter output line voltage pick-up unit of the present invention is applicable to detecting PWM voltage waveform, and has photoelectricity isolation very much, and cost is lower, and response speed is very fast, meets the needs that three-phase inverter output line voltage is detected.Can realize and detect faster response speed with lower cost, be applicable to very much the detection of the output line voltage of three-phase inverter series products.
Brief description of the drawings
The present invention has following accompanying drawing:
The circuit structure schematic diagram of Fig. 1 three-phase inverter output line voltage testing circuit,
Circuit structure schematic diagram in an embodiment of Fig. 2 three-phase inverter output line voltage testing circuit.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Three-phase inverter output line voltage pick-up unit of the present invention, adopt regular tap type photoelectrical coupler and electric resistance partial pressure unit composition three-phase inverter output line voltage testing circuit to detect three-phase inverter output line voltage, both there is response speed faster, there is again lower-cost advantage.
On the basis of technique scheme, as shown in Figure 1, described three-phase inverter output line voltage testing circuit comprises:
Be connected to electric resistance partial pressure unit, photoelectrical coupler, the filter amplification circuit of photoelectrical coupler secondary and the signal transformation circuit of rear class between three-phase inverter output phase voltage U and output phase voltage V;
Be connected to electric resistance partial pressure unit, photoelectrical coupler, the filter amplification circuit of photoelectrical coupler secondary and the signal transformation circuit of rear class between three-phase inverter output phase voltage V and output phase voltage W.
On the basis of technique scheme, as shown in Figure 1, the electric resistance partial pressure unit between described three-phase inverter output phase voltage U and output phase voltage V comprises resistance R 1 and resistance R 2,
Resistance R 1 is connected between output phase voltage U and the positive input terminal of photoelectrical coupler U2,
Resistance R 2 is connected between output phase voltage V and the negative input end of photoelectrical coupler U2,
The positive input terminal of photoelectrical coupler U1 is connected with the negative input end of photoelectrical coupler U2 simultaneously, and the negative input end of photoelectrical coupler U1 is connected with the positive input terminal of photoelectrical coupler U2;
Photoelectrical coupler U1 secondary, photoelectrical coupler U2 secondary are respectively equipped with filter amplification circuit,
The filter amplification circuit of described photoelectrical coupler U1 secondary comprises: biasing resistor R5, R6, and the prime filtering circuit being formed by resistance R 7, capacitor C 1, also comprise operational amplifier U5,
The filter amplification circuit of described photoelectrical coupler U2 secondary comprises: biasing resistor R8, R9, and the prime filtering circuit being made up of resistance R 10, capacitor C 2, also comprise operational amplifier U6;
Operational amplifier U5 rear class, operational amplifier U6 rear class are connected with signal transformation circuit,
The signal transformation circuit of described operational amplifier U5 and operational amplifier U6 rear class comprises:
Resistance R 11, R13, R14, R12, R15, and operational amplifier U9,
After operational amplifier U9, be provided with the filtering circuit being formed by resistance R 16, capacitor C 3.
Specifically, as shown in Figure 1:
Described biasing resistor R5 is connected between power supply and the output terminal of photoelectrical coupler U1 secondary, biasing resistor R6 is connected between the output terminal and ground of photoelectrical coupler U1 secondary, resistance R 7 in described prime filtering circuit is connected between the interface point of biasing resistor R5 and R6 and the in-phase input end of operational amplifier U5, capacitor C 1 is connected between the in-phase input end and ground of operational amplifier U5, and the inverting input of described operational amplifier U5 is connected to the output terminal of U5;
As shown in Figure 1, described biasing resistor R8 is connected between power supply and the output terminal of photoelectrical coupler U2 secondary, biasing resistor R9 is connected between the output terminal and ground of photoelectrical coupler U2 secondary, resistance R 10 in described prime filtering circuit is connected between the interface point of biasing resistor R8 and R9 and the in-phase input end of operational amplifier U6, capacitor C 2 is connected between the in-phase input end and ground of operational amplifier U6, and the inverting input of described operational amplifier U6 is connected to the output terminal of U6;
Resistance R 13 one end in described rear class signal transformation circuit are connected to power supply, the other end is connected with resistance R 14, the other end of resistance R 14 is connected to ground, resistance R 11 is connected between the output terminal and resistance R 13 and the interface point of resistance R 14 of operational amplifier U5, the in-phase input end of operational amplifier U9 is also connected on the interface point of resistance R 13 and resistance R 14 simultaneously, resistance R 12 is connected between the output terminal of operational amplifier U6 and the inverting input of operational amplifier U9, resistance R 15 is connected between the inverting input of operational amplifier U9 and the output terminal of U9, one end of resistance R 16 is connected to the output terminal of operational amplifier U9, the other end is connected to capacitor C 3, and the other end of capacitor C 3 is connected to ground.
On the basis of technique scheme, as shown in Figure 1, the electric resistance partial pressure unit between described three-phase inverter output phase voltage V and output phase voltage W comprises resistance R 3 and resistance R 4,
Resistance R 3 is connected between output phase voltage V and the positive input terminal of photoelectrical coupler U4,
Resistance R 4 is connected between output phase voltage W and the negative input end of photoelectrical coupler U4,
The positive input terminal of photoelectrical coupler U3 is connected with the negative input end of photoelectrical coupler U4 simultaneously, and the negative input end of photoelectrical coupler U3 is connected with the positive input terminal of photoelectrical coupler U4;
Photoelectrical coupler U3 secondary, photoelectrical coupler U4 secondary are respectively equipped with filter amplification circuit,
The filter amplification circuit of described photoelectrical coupler U3 secondary comprises: biasing resistor R17, R18, and the prime filtering circuit being formed by resistance R 19, capacitor C 4, also comprise operational amplifier U7,
The filter amplification circuit of described photoelectrical coupler U4 secondary comprises: biasing resistor R20, R21, and the prime filtering circuit being made up of resistance R 22, capacitor C 5, also comprise operational amplifier U8;
Operational amplifier U7 rear class, operational amplifier U8 rear class are connected with signal transformation circuit,
The signal transformation circuit of described operational amplifier U7 and operational amplifier U8 rear class comprises:
Resistance R 23, R25, R26, R24, R27, and operational amplifier U10,
After operational amplifier U10, be provided with the filtering circuit being formed by resistance R 28, capacitor C 6.
Specifically, as shown in Figure 1:
Described biasing resistor R17 is connected between power supply and the output terminal of photoelectrical coupler U3 secondary, biasing resistor R18 is connected between the output terminal and ground of photoelectrical coupler U3 secondary, resistance R 19 in described prime filtering circuit is connected between the interface point of biasing resistor R17 and R18 and the in-phase input end of operational amplifier U7, capacitor C 4 is connected between the in-phase input end and ground of operational amplifier U7, and the inverting input of described operational amplifier U7 is connected to the output terminal of U7;
As shown in Figure 1, described biasing resistor R20 is connected between power supply and the output terminal of photoelectrical coupler U4 secondary, biasing resistor R21 is connected between the output terminal and ground of photoelectrical coupler U4 secondary, resistance R 22 in described prime filtering circuit is connected between the interface point of biasing resistor R20 and R21 and the in-phase input end of operational amplifier U8, capacitor C 5 is connected between the in-phase input end and ground of operational amplifier U8, and the inverting input of described operational amplifier U8 is connected to the output terminal of U8;
Resistance R 25 one end in described rear class signal transformation circuit are connected to power supply, the other end is connected with resistance R 26, the other end of resistance R 26 is connected to ground, resistance R 23 is connected between the output terminal and resistance R 25 and the interface point of resistance R 26 of operational amplifier U7, the in-phase input end of operational amplifier U10 is also connected on the interface point of resistance R 25 and resistance R 26 simultaneously, resistance R 24 is connected between the output terminal of operational amplifier U8 and the inverting input of operational amplifier U10, resistance R 27 is connected between the inverting input of operational amplifier U10 and the output terminal of U10, one end of resistance R 28 is connected to the output terminal of operational amplifier U10, the other end is connected to capacitor C 6, and the other end of capacitor C 6 is connected to ground.
On the basis of technique scheme, the resistance parameter in described circuit meets following relation:
R11=R12，R13//R14=R15；
R23=R24，R25//R26=R27；
The parallel connection of " // " operator representation.
On the basis of technique scheme, the resistance R 1 in electric resistance partial pressure unit, R2, R3, R4 are all made up of a resistance at least respectively, that is: can be a resistance, can be also that more than two resistance is in series.
For example, as shown in Figure 2, resistance R 1 can be composed in series by resistance R 101, R102, R103, R104, R105, resistance R 2 can be composed in series by resistance R 106, R107, R108, R109, R110, resistance R 3 can be composed in series by resistance R 111, R112, R113, R114, R115, and resistance R 4 can be composed in series by resistance R 116, R117, R118, R119, R120.
The content not being described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (3)
1. a three-phase inverter output line voltage pick-up unit, is characterized in that: adopt regular tap type photoelectrical coupler and electric resistance partial pressure unit composition three-phase inverter output line voltage testing circuit to detect three-phase inverter output line voltage;
Described three-phase inverter output line voltage testing circuit comprises:
Be connected to electric resistance partial pressure unit, photoelectrical coupler, the filter amplification circuit of photoelectrical coupler secondary and the signal transformation circuit of rear class between three-phase inverter output phase voltage U and output phase voltage V;
Be connected to electric resistance partial pressure unit, photoelectrical coupler, the filter amplification circuit of photoelectrical coupler secondary and the signal transformation circuit of rear class between three-phase inverter output phase voltage V and output phase voltage W;
Electric resistance partial pressure unit between described three-phase inverter output phase voltage U and output phase voltage V comprises resistance R 1 and resistance R 2,
Resistance R 1 is connected between output phase voltage U and the positive input terminal of photoelectrical coupler U2,
Resistance R 2 is connected between output phase voltage V and the negative input end of photoelectrical coupler U2,
The positive input terminal of photoelectrical coupler U1 is connected with the negative input end of photoelectrical coupler U2 simultaneously, and the negative input end of photoelectrical coupler U1 is connected with the positive input terminal of photoelectrical coupler U2;
Photoelectrical coupler U1 secondary, photoelectrical coupler U2 secondary are respectively equipped with filter amplification circuit,
The filter amplification circuit of described photoelectrical coupler U1 secondary comprises: biasing resistor R5, R6, and the prime filtering circuit being formed by resistance R 7, capacitor C 1, also comprise operational amplifier U5,
The filter amplification circuit of described photoelectrical coupler U2 secondary comprises: biasing resistor R8, R9, and the prime filtering circuit being made up of resistance R 10, capacitor C 2, also comprise operational amplifier U6;
Operational amplifier U5 rear class, operational amplifier U6 rear class are connected with signal transformation circuit,
The signal transformation circuit of described operational amplifier U5 and operational amplifier U6 rear class comprises:
Resistance R 11, R13, R14, R12, R15, and operational amplifier U9,
After operational amplifier U9, be provided with the filtering circuit being formed by resistance R 16, capacitor C 3;
Electric resistance partial pressure unit between described three-phase inverter output phase voltage V and output phase voltage W comprises resistance R 3 and resistance R 4,
Resistance R 3 is connected between output phase voltage V and the positive input terminal of photoelectrical coupler U4,
Resistance R 4 is connected between output phase voltage W and the negative input end of photoelectrical coupler U4,
The positive input terminal of photoelectrical coupler U3 is connected with the negative input end of photoelectrical coupler U4 simultaneously, and the negative input end of photoelectrical coupler U3 is connected with the positive input terminal of photoelectrical coupler U4;
Photoelectrical coupler U3 secondary, photoelectrical coupler U4 secondary are respectively equipped with filter amplification circuit,
The filter amplification circuit of described photoelectrical coupler U3 secondary comprises: biasing resistor R17, R18, and the prime filtering circuit being formed by resistance R 19, capacitor C 4, also comprise operational amplifier U7,
The filter amplification circuit of described photoelectrical coupler U4 secondary comprises: biasing resistor R20, R21, and the prime filtering circuit being made up of resistance R 22, capacitor C 5, also comprise operational amplifier U8;
Operational amplifier U7 rear class, operational amplifier U8 rear class are connected with signal transformation circuit,
The signal transformation circuit of described operational amplifier U7 and operational amplifier U8 rear class comprises:
Resistance R 23, R25, R26, R24, R27, and operational amplifier U10,
After operational amplifier U10, be provided with the filtering circuit being formed by resistance R 28, capacitor C 6.
2. three-phase inverter output line voltage pick-up unit as claimed in claim 1, is characterized in that, the resistance parameter in described circuit meets following relation:
R11=R12，R13//R14=R15；
R23=R24，R25//R26=R27。
3. three-phase inverter output line voltage pick-up unit as claimed in claim 1, is characterized in that: the resistance R 1 in electric resistance partial pressure unit, R2, R3, R4 are all made up of a resistance at least respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110393989.3A CN102435821B (en) | 2011-12-01 | 2011-12-01 | Detection method of three-phase inverter output line voltage |
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| CN201110393989.3A CN102435821B (en) | 2011-12-01 | 2011-12-01 | Detection method of three-phase inverter output line voltage |
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| CN102435821B true CN102435821B (en) | 2014-10-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102866278A (en) * | 2012-06-28 | 2013-01-09 | 深圳市汇川技术股份有限公司 | Output voltage detecting circuit for frequency changer and frequency changer |
| CN103424598B (en) * | 2013-06-25 | 2016-04-27 | 深圳市英威腾电气股份有限公司 | Inversion system output voltage detecting circuit and inversion system |
| US9374021B2 (en) * | 2013-12-16 | 2016-06-21 | Rockwell Automation Technologies, Inc. | PWM output voltage measurement apparatus and method |
| CN107340420B (en) * | 2017-07-19 | 2023-11-28 | 广东美的暖通设备有限公司 | Three-phase voltage detection circuit and air conditioner |
| CN109507491B (en) * | 2018-10-19 | 2021-12-28 | 陕西航空电气有限责任公司 | Three-phase inverter voltage phase sequence detection circuit, device and method |
| CN110470876B (en) * | 2019-09-19 | 2021-12-24 | 散裂中子源科学中心 | High-voltage isolation detection circuit and detection method of midpoint grounding high-voltage system |
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| JP4663404B2 (en) * | 2005-05-27 | 2011-04-06 | 株式会社デンソー | Common mode noise canceling circuit device for high voltage motor equipment for vehicle use |
| CN101556295A (en) * | 2009-05-06 | 2009-10-14 | 厦门拓宝科技有限公司 | Voltage linear isolation detection method and circuit |
| CN201490697U (en) * | 2009-05-11 | 2010-05-26 | 奇瑞汽车股份有限公司 | Three-phase current detection and protection circuit |
| CN202362351U (en) * | 2011-12-01 | 2012-08-01 | 合肥索维能源科技有限公司 | Three-phase inverter output line voltage detection device |
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