CN203690879U - Overcurrent protection circuit of active power filter - Google Patents
Overcurrent protection circuit of active power filter Download PDFInfo
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- CN203690879U CN203690879U CN201320835452.2U CN201320835452U CN203690879U CN 203690879 U CN203690879 U CN 203690879U CN 201320835452 U CN201320835452 U CN 201320835452U CN 203690879 U CN203690879 U CN 203690879U
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- diode
- comparator
- resistance
- overcurrent protection
- active power
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Abstract
The utility model provides an overcurrent protection circuit of an active power filter. The overcurrent protection circuit includes a first comparator and a second comparator, three phases of current signals are respectively connected with the anodes of a diode D1, a diode D3, and a diode D5, and the cathodes of a diode D2, a diode D4, and a diode D6, the anodes of the diode D1, the diode D3, and the diode D5 are connected with the reverse-phase input end of the first comparator via a resistor R5, the cathodes of the diode D2, the diode D4, and the diode D6 are connected with the reverse-phase input end of the second comparator via an inverter, the same-phase input ends of the first comparator and the second comparator are connected with a potentiometer simultaneously, and a reference voltage is adjusted by the potentiometer, the output ends of the first comparator and the second comparator are connected with an upper resistor and a signal output resistor, a voltage of +5V is pulled by the upper resistor, and signals are output by the signal output resistor. The overcurrent protection circuit realizes the shutdown of related equipment to protect related facilities when current overshoot reaches the preset standard upper limit.
Description
Technical field
The utility model belongs to current sample/protective circuit technical field, particularly relates to a kind of circuit overcurrent protection that is suitable for Active Power Filter-APF.
Background technology
Circuit overcurrent protection can be realized when current over pulse reaches in preset standard and prescribing a time limit, and realizes and closes relevant device, to protect the objects such as related facility, in field of power electronics extensive application.
Along with the raising of industrial automation level, all trades and professions are widely used the device for high-power power electronic such as rectifier, frequency converter, the electric current and voltage that produces a large amount of high order harmonic components injects electrical network, line voltage, current waveform distortion, the quality of power supply are worsened, for administering mains by harmonics, the pure quality of power supply, Active Power Filter-APF (APF) can overcome the shortcoming of traditional harmonic suppressing method such as passive filter, is subject to extensive concern with its remarkable filtering performance.
For the Active Power Filter-APF main circuit of single PWM current transformer, according to the difference of its DC side energy-storage travelling wave tube, can be divided into again voltage-type main circuit, current mode main circuit.
Current-type PWM rectifier type main circuit, DC side is connected to large inductance, and in the time of normal work, its electric current remains unchanged substantially, can regard current source as.Its advantage is, can be due to the straight-through fault that is short-circuited of main circuit switch device.But, on the large inductance of Current-type PWM rectifier DC side, there is all the time electric current to flow through, this electric current will produce larger loss in the internal resistance at large inductance, therefore use at present less.
Voltage PWM converter type main circuit, DC side is connected to large electric capacity, and in the time of normal work, its voltage remains unchanged substantially, can regard voltage source as.Compared with Current-type PWM rectifier, the advantage of voltage PWM converter is not produce larger loss.But in the time that main circuit switch device is straight-through, fault can be short-circuited.Therefore, need to take certain safeguard measure, prevent the damage, straight-through of switching device.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of circuit overcurrent protection of Active Power Filter-APF, the Active Power Filter-APF of solution voltage PWM converter type main circuit overcurrent, short circuit hidden danger in actual applications.
The utility model is to realize like this, this circuit comprises that the negative electrode that the first comparator, the second comparator, three-phase current signal meet respectively the anode of diode D1, diode D3, diode D5 and diode D2, diode D4, diode D6 forms three-phase commutation bridge, and diode D1, diode D3 are connected with the first comparator inverting input by a resistance R 5 with the anode of diode D5; The negative electrode of diode D2, diode D4, diode D6 is connected with the inverting input of the second comparator by an inverter; The input in the same way of the first comparator and the second comparator is connected with a potentiometer simultaneously, regulates reference voltage by potentiometer; The first comparator is connected a upper resistance and signal output resistance with the output of the second comparator, by move to+5V of upper resistance reference voltage, and through signal output resistance output signal.
Further, between the in-phase input end of described the first comparator and inverting input, be connected with diode D7 and the diode D8 of parallel connected in reverse phase, the clamped protective circuit of composition the first comparator.
Further, the in-phase input end of described the first comparator is connected with the parallel-connection structure of resistance R 6 and capacitor C 2, and another link ground connection of resistance R 6 and capacitor C 2, forms two groups of low pass filters with filtering high-frequency interferencing signal.
Further, between the in-phase input end of described the second comparator and inverting input, be connected with diode D9 and the diode D10 of parallel connected in reverse phase, the clamped protective circuit of composition the second comparator.
Further, the in-phase input end of described the second comparator is connected with the parallel-connection structure of resistance R 7 and capacitor C 4, and another link ground connection of resistance R 7 and capacitor C 4, forms two groups of low pass filters with filtering high-frequency interferencing signal.
Further, described inverter is made up of the first operational amplifier, resistance R 2, resistance R 3, the in-phase input end of the first operational amplifier is through resistance R 3 ground connection, the output of the first operational amplifier is connected with the inverting input of the first operational amplifier by resistance R 2, and accesses the inverting input of the second comparator by resistance R 4.
Further, the output voltage of the output of described potentiometer is amplified and is exported to the first comparator by the signal of one second operational amplifier.
The utility model compared with prior art; beneficial effect is: the utility model can be realized when current over pulse reaches in preset standard and being prescribed a time limit by circuit overcurrent protection, realizes and closes relevant device, to protect related facility; the utility model circuit structure is simple, and control and operation is simple.
Brief description of the drawings
Fig. 1 is the electrical block diagram that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, this circuit comprises that the negative electrode that the first comparator IC2A, the second comparator IC2B, three-phase current signal Ia, Ib, ic meet respectively the anode of diode D1, diode D3, diode D5 and diode D2, diode D4, diode D6 forms three-phase commutation bridge, and diode D1, diode D3 are connected with the first comparator IC2A inverting input by a resistance R 5 with the anode of diode D5; The negative electrode of diode D2, diode D4, diode D6 is connected with the inverting input of the second comparator IC2B by an inverter; The input in the same way of the first comparator IC2A and the second comparator IC2B is connected with a potentiometer P1 simultaneously, regulate reference voltage by potentiometer P1, the output voltage of the output of potentiometer P1 is amplified and is exported to the first comparator IC2A by the signal of the second operational amplifier IC1A, and the in-phase input end of the second operational amplifier IC1A is by capacitor C 1 ground connection.
The first comparator IC2A is connected a upper resistance R 8 and signal output resistance R9 with the output of the second comparator IC2B, by upper move to+5V of resistance R 8 reference voltage, and through signal output resistance R9 output signal.
Between the in-phase input end of the first comparator IC2A and inverting input, be connected with diode D7 and the diode D8 of parallel connected in reverse phase, the clamped protective circuit of composition the first comparator IC2A.
The in-phase input end of the first comparator IC2A is connected with the parallel-connection structure of resistance R 6 and capacitor C 2, and another link ground connection of resistance R 6 and capacitor C 2, forms two groups of low pass filters with filtering high-frequency interferencing signal.
Between the in-phase input end of the second comparator IC2B and inverting input, be connected with diode D9 and the diode D10 of parallel connected in reverse phase, the clamped protective circuit of composition the second comparator IC2B.
The in-phase input end of the second comparator IC2B is connected with the parallel-connection structure of resistance R 7 and capacitor C 4, and another link ground connection of resistance R 7 and capacitor C 4, forms two groups of low pass filters with filtering high-frequency interferencing signal.
Inverter is made up of the first operational amplifier IC1B, resistance R 2, resistance R 3, the in-phase input end of the one or three operational amplifier IC1B is through resistance R 3 ground connection, the output of the first operational amplifier IC1B is connected with the inverting input of the first operational amplifier IC1B by resistance R 2, and accesses the inverting input of the second comparator IC2B by resistance R 4.
Operation principle of the present utility model is as follows:
The second operational amplifier IC1A and the first operational amplifier IC1B, the first comparator IC2A and the second comparator IC2B are comparator.Slip terminal by potentiometer P1 can be obtained the positive voltage between 0～15V, and IC1A is voltage follower, and regulator potentiometer P1P1 can determine the fiducial value of overcurrent.Its operation principle is: taking A mutually as example, in the time of ia > 0, ia is added on the inverting input of the first comparator IC2A through diode D1, resistance R 5, and with the positive potential (through the current reference value regulating) of the in-phase input end of the first comparator IC2A relatively, when normal work, ia is less than the positive potential of the in-phase input end of the first comparator IC2A, therefore the first comparator IC2A is output as high level.In the time that overcurrent appears in circuit, when ia is greater than the positive potential of homophase utmost point input of the first comparator IC2A, the first comparator IC2A is output as low level, forms protection output together with other protection output signals, sends block signal.Turn-off all IGBT through drive circuit again.In the time of ia < 0, ia is through diode D2, resistance R 1, through inverter, this signal is become to positive level again, be added on the inverting input of the second comparator IC2B through resistance R 4, the positive potential (through the current reference value regulating) of the in-phase input end of same and the second comparator IC2B relatively, to determine that the second comparator IC2B is output as high level or low level.Diode D7 and diode D8, diode D9 and diode D10 form respectively clamped protective circuit; resistance R 6 and capacitor C 2, resistance R 7 and capacitor C 4 form respectively two groups of low pass filters with filtering high-frequency interferencing signal; upper resistance R 8 is by upper output voltage to+5V size, and overcurrent protection signal is exported through resistance R 9.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. the circuit overcurrent protection of an Active Power Filter-APF, it is characterized in that, this circuit comprises that the negative electrode that the first comparator, the second comparator, three-phase current signal meet respectively the anode of diode D1, diode D3, diode D5 and diode D2, diode D4, diode D6 forms three-phase commutation bridge, and diode D1, diode D3 are connected with the first comparator inverting input by a resistance R 5 with the anode of diode D5; The negative electrode of diode D2, diode D4, diode D6 is connected with the inverting input of the second comparator by an inverter; The input in the same way of the first comparator and the second comparator is connected with a potentiometer simultaneously, regulates reference voltage by potentiometer; The first comparator is connected a upper resistance and signal output resistance with the output of the second comparator, by move to+5V of upper resistance reference voltage, and through signal output resistance output signal.
2. the circuit overcurrent protection of Active Power Filter-APF as claimed in claim 1; it is characterized in that; between the in-phase input end of described the first comparator and inverting input, be connected with diode D7 and the diode D8 of parallel connected in reverse phase, the clamped protective circuit of composition the first comparator.
3. the circuit overcurrent protection of Active Power Filter-APF as claimed in claim 1 or 2; it is characterized in that; the in-phase input end of described the first comparator is connected with the parallel-connection structure of resistance R 6 and capacitor C 2; another link ground connection of resistance R 6 and capacitor C 2, forms two groups of low pass filters with filtering high-frequency interferencing signal.
4. the circuit overcurrent protection of Active Power Filter-APF as claimed in claim 1; it is characterized in that; between the in-phase input end of described the second comparator and inverting input, be connected with diode D9 and the diode D10 of parallel connected in reverse phase, the clamped protective circuit of composition the second comparator.
5. the circuit overcurrent protection of the Active Power Filter-APF as described in claim 1 or 4; it is characterized in that; the in-phase input end of described the second comparator is connected with the parallel-connection structure of resistance R 7 and capacitor C 4; another link ground connection of resistance R 7 and capacitor C 4, forms two groups of low pass filters with filtering high-frequency interferencing signal.
6. the circuit overcurrent protection of Active Power Filter-APF as claimed in claim 1; it is characterized in that; described inverter is made up of the first operational amplifier, resistance R 2, resistance R 3; the in-phase input end of the first operational amplifier is through resistance R 3 ground connection; the output of the first operational amplifier is connected with the inverting input of the first operational amplifier by resistance R 2, and accesses the inverting input of the second comparator by resistance R 4.
7. the circuit overcurrent protection of Active Power Filter-APF as claimed in claim 1, is characterized in that, the output voltage of the output of described potentiometer is amplified and exported to the first comparator by the signal of one second operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320835452.2U CN203690879U (en) | 2013-12-17 | 2013-12-17 | Overcurrent protection circuit of active power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320835452.2U CN203690879U (en) | 2013-12-17 | 2013-12-17 | Overcurrent protection circuit of active power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203690879U true CN203690879U (en) | 2014-07-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320835452.2U Expired - Fee Related CN203690879U (en) | 2013-12-17 | 2013-12-17 | Overcurrent protection circuit of active power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203690879U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281297A (en) * | 2015-11-20 | 2016-01-27 | 许继电源有限公司 | An overcurrent protection circuit for a three-phase rectifier |
-
2013
- 2013-12-17 CN CN201320835452.2U patent/CN203690879U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281297A (en) * | 2015-11-20 | 2016-01-27 | 许继电源有限公司 | An overcurrent protection circuit for a three-phase rectifier |
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Legal Events
| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20171217 |