CN201160257Y - Harmonic suppression circuit for frequency convertor power source commutation - Google Patents
Harmonic suppression circuit for frequency convertor power source commutation Download PDFInfo
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- CN201160257Y CN201160257Y CNU2008200026162U CN200820002616U CN201160257Y CN 201160257 Y CN201160257 Y CN 201160257Y CN U2008200026162 U CNU2008200026162 U CN U2008200026162U CN 200820002616 U CN200820002616 U CN 200820002616U CN 201160257 Y CN201160257 Y CN 201160257Y
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- bidirectional switch
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Abstract
The utility relates to a harmonic inhibition circuit for rectifying power supply of transducer, which comprises a three-phase bridge type rectifying circuit connected on the input end of three-phase power supply and a Y-type connected bidirectional switch group, a series-connection circuit with capacitors C4 and C5 are connected between two output ends of the three-phase bridge type rectifying circuit, the common point of the bidirectional switch group is connected with the series connection contact point of the capacitors C4 and C5, the control points are connected with a microprocessor, the microprocessor is stored with a control program. resistance and capacitor series-connection circuits are also connected between the input end of the three-phase power supply and the grounding end, the other end of the resistance is connected with the input end of the three-phase power supply, the other end of the capacitor is connected with the grounding end. In the utility model, each phase current can perform switch time control without phase displacement, so as to improve power factor and efficiency. When the voltage at output end generates saltation, the power module is not to absorb instantaneous pulse energy, thereby inhibiting high order harmonic of rectifying circuit and lowering the interference on electricity net.
Description
Technical field
The utility model belongs to the some of frequency converter, and the harmonic wave that relates in particular to a kind of converter power supply rectification suppresses circuit.
Background technology
Three-phase power input end connects common three-phase bridge rectifier circuit in the existing frequency converter, and the output termination power model of rectification circuit is connected with the parallel circuits of resistance, electric capacity between two outputs of rectification circuit.Because three-phase bridge rectifier circuit fluctuation waveform output composition is big, in power model switch moment, power model can be drawn a large amount of electric currents, causes the DC source voltage die, thereby produces bigger high order harmonic component, and electrical network is caused comparatively serious disturbance.The electric capacity that is connected in simultaneously between rectification circuit two outputs also can cause phase-shifted, has reduced power factor.
Summary of the invention
The utility model mainly solves existing converter power supply rectification circuit can produce bigger high order harmonic component and phase-shifted, causes comparatively serious Disturbance in Power Net, the technical problem that power factor reduces; A kind of effective inhibition high order harmonic component is provided, does not produce phase-shifted, improve power factor and efficient, reduce harmonic wave inhibition circuit the converter power supply rectification of Disturbance in Power Net.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: the utility model comprises the three-phase bridge rectifier circuit that is connected on the three-phase power input end, be connected with the series circuit of capacitor C 4, C5 between two outputs of described three-phase bridge rectifier circuit, also be connected with the bidirectional switch group on the three-phase power input end, the bidirectional switch group connects with the Y type, their common point links to each other with the series connection contact of capacitor C 4, C5, their control point links to each other with microprocessor, and storage has control program in the microprocessor.During use, two output termination power models of three-phase bridge rectifier circuit.By the break-make of each switch of microprocessor control bidirectional switch group, each phase current can carry out control switching time, the phase-shifted phenomenon can not take place, and has improved power factor and efficient, and the efficient of AC, DC conversion links can reach about 97%.Because the bidirectional switch group connects with the Y type, their common point links to each other with the series connection contact of capacitor C 4, C5, so the voltage that switching device bears is output dc voltage half, can use low withstand voltage device, reduce cost, simultaneously during the voltage jump of output, power model can not drawn the momentary pulse energy, thereby suppressed the high order harmonic component of rectification circuit, reduced the wastage, reduced interference electrical network.
As preferably, described bidirectional switch group is made up of three same circuits, each circuit comprises two triodes, two diodes, the positive pole of two diodes links to each other, the negative pole of a diode links to each other with a end points in the three-phase power input end, the negative pole of another diode connects the common point of bidirectional switch group, the collector electrode of two triodes, emitter are connected across the both positive and negative polarity of two diodes respectively, the collector electrode of triode connects the negative pole of diode, the emitter of triode connects the positive pole of diode, and the base stage of triode connects microprocessor.Control is convenient, stable performance.
As preferably, described microprocessor is a dsp chip.Adopt the work of dsp chip control bidirectional switch group, it is convenient to realize.
As preferably, also be connected with resistor-capacitor series circuit between described three-phase power input end and the earth terminal respectively, another termination three-phase power input end of resistance, another termination earth terminal of electric capacity.Guarantee that filter effect is better.
The beneficial effects of the utility model are: each phase current can carry out control switching time, the phase-shifted phenomenon can not take place, and improves power factor and efficient.The bidirectional switch group connects with the Y type, the voltage of their common point is half of output voltage of three-phase bridge rectifier circuit, the voltage that switching device is born reduces, can reduce cost, simultaneously during the voltage jump of output, power model can not drawn the momentary pulse energy, thereby has suppressed the high order harmonic component of rectification circuit, reduce the wastage, reduce interference electrical network.
Description of drawings
Fig. 1 is a kind of circuit theory diagrams that the utility model links to each other with power model.
1. three-phase power input ends among the figure, 2. three-phase bridge rectifier circuit, 3. bidirectional switch group, 4. microprocessor, 5. resistor-capacitor series circuit, 6. power model.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: the harmonic wave of the converter power supply rectification of present embodiment suppresses circuit, and as shown in Figure 1, R, S, T are three-phase power input ends 1, and diode D1～D6 forms three-phase bridge rectifier circuit 2.The positive pole of D1, D3, D5 links to each other with R, S, T respectively, and the negative pole of D1, D3, D5 is connected together and links to each other with the P pin of power model 6; The negative pole of D2, D4, D6 links to each other with R, S, T respectively, and the positive pole of D2, D4, D6 is connected together and links to each other with the N pin of power model 6.Be connected with the series circuit of capacitor C 4, C5 between two outputs of three-phase bridge rectifier circuit 2 (being P, N pin).Be connected with the bidirectional switch group 3 that is formed with the connection of Y type by bidirectional switch S1, S2, S3 on three-phase power input end R, S, the T, their common point links to each other with the series connection contact of capacitor C 4, C5.Each bidirectional switch is made up of two triodes, two diodes, the positive pole of two diodes links to each other, the negative pole of a diode connects an end points in the three-phase power input end, the negative pole of another diode connects the common point of bidirectional switch group, the collector electrode of two triodes, emitter are connected across the both positive and negative polarity of two diodes respectively, the collector electrode of triode connects the negative pole of diode, and the emitter of triode connects the positive pole of diode, and the base stage of triode connects microprocessor 4.Storage has control program in the microprocessor 4.Also be connected with resistor-capacitor series circuit 5 between three-phase power input end R, S, T and the earth terminal respectively, R1, C1 series connection, R2, C2 series connection, R3, C3 series connection, the other end of resistance R 1, R2, R3 meets R, S, T respectively, another termination earth terminal of capacitor C 1, C2, C3.
Each phase current of the present utility model can carry out control switching time, the phase-shifted phenomenon can not take place, and has improved power factor and efficient.The bidirectional switch group connects with the Y type, and the voltage of their common point is half of power model input voltage, the voltage that device is born in the bidirectional switch group is reduced, thereby reduce cost; Simultaneously during the voltage jump of output, power model can not drawn the momentary pulse energy, thereby has suppressed the high order harmonic component of rectification circuit, reduces the wastage, and reduces the interference to electrical network.
Claims (4)
1. the harmonic wave of a converter power supply rectification suppresses circuit, comprise the three-phase bridge rectifier circuit (2) that is connected on the three-phase power input end (1), it is characterized in that being connected with between two outputs of described three-phase bridge rectifier circuit (2) series circuit of capacitor C 4, C5, also be connected with bidirectional switch group (3) on the three-phase power input end (1), bidirectional switch group (3) connects with the Y type, their common point links to each other with the series connection contact of capacitor C 4, C5, their control point links to each other with microprocessor (4), and storage has control program in the microprocessor (4).
2. the harmonic wave of converter power supply rectification according to claim 1 suppresses circuit, it is characterized in that described bidirectional switch group (3) is made up of three same circuits, each circuit comprises two triodes, two diodes, the positive pole of two diodes links to each other, the negative pole of a diode links to each other with a end points in the three-phase power input end (1), the negative pole of another diode connects the common point of bidirectional switch group, the collector electrode of two triodes, emitter is connected across the both positive and negative polarity of two diodes respectively, the collector electrode of triode connects the negative pole of diode, the emitter of triode connects the positive pole of diode, and the base stage of triode connects microprocessor (4).
3. the harmonic wave of converter power supply rectification according to claim 1 and 2 suppresses circuit, it is characterized in that described microprocessor (4) is a dsp chip.
4. the harmonic wave of converter power supply rectification according to claim 1 and 2 suppresses circuit, it is characterized in that also being connected with respectively between described three-phase power input end (1) and the earth terminal resistor-capacitor series circuit (5), another termination three-phase power input end (1) of resistance, another termination earth terminal of electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200026162U CN201160257Y (en) | 2008-02-03 | 2008-02-03 | Harmonic suppression circuit for frequency convertor power source commutation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200026162U CN201160257Y (en) | 2008-02-03 | 2008-02-03 | Harmonic suppression circuit for frequency convertor power source commutation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201160257Y true CN201160257Y (en) | 2008-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200026162U Expired - Fee Related CN201160257Y (en) | 2008-02-03 | 2008-02-03 | Harmonic suppression circuit for frequency convertor power source commutation |
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| Country | Link |
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| CN (1) | CN201160257Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812314A (en) * | 2012-11-08 | 2014-05-21 | 上海儒竞电子科技有限公司 | High power factor three phase rectification circuit |
-
2008
- 2008-02-03 CN CNU2008200026162U patent/CN201160257Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812314A (en) * | 2012-11-08 | 2014-05-21 | 上海儒竞电子科技有限公司 | High power factor three phase rectification circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081203 Termination date: 20110203 |