CN204103757U - A kind of change rectification buck PFC control circuit - Google Patents
A kind of change rectification buck PFC control circuit Download PDFInfo
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- CN204103757U CN204103757U CN201420410279.6U CN201420410279U CN204103757U CN 204103757 U CN204103757 U CN 204103757U CN 201420410279 U CN201420410279 U CN 201420410279U CN 204103757 U CN204103757 U CN 204103757U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The utility model discloses a kind of change rectification buck PFC control circuit, comprise input voltage sample circuit (1), output voltage is adjustable sample circuit (2), comparison circuit (3) and switching circuit (4), by the sampled voltage permanent circuit of active boost type pfc circuit is changed into sampled voltage conditioned circuit, increase output sampled voltage and input sample voltage comparator circuit control the output of the most widely used active boost type PFC control chip simultaneously, forced commutation and natural commutation hocket, realize the buck of output voltage, structure is simple, with low cost, power factor is close to 1, output voltage does not change with the change of load, switching time, point controlled automatically, without the need to input voltage zero cross detection circuit and independent design MCU, by active boost type, the advantage of the active voltage-dropping type of part and the three kinds of power factor corrections of active buck-boost type rolls into one, unequally loaded needs can be adapted to.
Description
Technical field
The utility model relates to a kind of change rectification buck PFC control circuit, belongs to Energy control technical field.
Background technology
Current power factor corrects (Power Factor Correction, be called for short: PFC) mainly contain active boost type, the active voltage-dropping type of part and active buck-boost type three kinds of modes, active boost type PFC is the method be most widely used, optional control chip is a lot, and it is cheap, it adopts forced commutation technology, circuit is simple, input current and input voltage homophase, current waveform is close to sinusoidal, PF value can close to 1, during equal power output, low to the current rating needed for rear class inversion module, but output voltage is high, be generally about 380-400V, higher to the voltage rating needed for rear class inversion module, the Switching Power Supply theory diagram be made up of active boost type PFC as shown in Figure 1.Part active voltage-dropping type PFC technology is a kind of a kind of power factor correction technology combining active PFC technology and passive PFC technology, when input ac voltage instantaneous value adopts forced commutation lower than during output dc voltage value, otherwise then adopt natural commutation, power loss can reduce by 1/3rd relative to active boost type, output voltage is generally at about 290V, but PF value is generally 0.95, current waveform distorts to some extent, and need input voltage zero cross detection circuit, input and output voltage magnitude testing circuit, current sampling circuit, power tube drive circuit and main control MCU, need design separately, can not the active boost type PFC control chip of the large low price of the amount of employing.Active buck-boost type PFC adopts Cuk, Zeta and Sepic converter usually, and output voltage is adjustable, can meet different needs, but compares with active boost type PFC, and circuit structure is very complicated, does not also have special integrated circuit, and cost is higher.
Utility model content
The purpose of this utility model is for the deficiencies in the prior art, increase simple control circuit by appropriate change active boost type PFC output voltage sampling circuit, control the output of active boost type PFC control chip, regulate pfc circuit rectification state, realize power factor close to 1, output voltage is adjustable, to meet unequally loaded needs.
The utility model solves the scheme that its technical problem adopts: comprise input voltage sample circuit, output voltage is adjustable sample circuit, comparison circuit and switching circuit, it is characterized in that: the output voltage Vin after input voltage sample circuit and rectifier bridge stack, comparison circuit connects, the output voltage Vout of output voltage is adjustable sample circuit and pfc circuit, comparison circuit connects, comparison circuit and input voltage sample circuit, output voltage is adjustable sample circuit, switching circuit connects, switching circuit and comparison circuit, the output Out of active boost type PFC control chip connects.
Described input voltage sample circuit is made up of two resistance R1, R2, and the upper end of resistance R1 is connected with the output voltage Vin after rectifier bridge stack, and the lower end of resistance R1 is connected with the upper end of resistance R2, the in-phase input end of comparison circuit, the lower end ground connection of resistance R2.
Described output voltage is adjustable, and sample circuit is made up of two fixed resistances R3, R4 and variable resistor R5, the upper end of resistance R3 is connected with the output voltage Vout of pfc circuit, the lower end of resistance R3 is connected with the upper end of resistance R4, the inverting input of comparison circuit, the lower end of resistance R4 is connected with the upper end of variable resistor R5, the lower end ground connection of variable resistor R5.
Described comparison circuit is made up of comparator OP, the inverting input of comparator OP is connected with the lower end of the upper end of resistance R4, resistance R3, the in-phase input end of comparator OP is connected with the lower end of the upper end of resistance R2, resistance R1, and the output of comparator OP is connected with the left end of resistance R6.
Described switching circuit is made up of resistance R6 and triode Q1, the left end of resistance R6 is connected with the output of comparator OP, the right-hand member of resistance R6 is connected with the base stage of triode Q1, and the collector electrode of triode Q1 is connected with the output Out of active boost type PFC control chip, the grounded emitter of triode Q1.
Compared to the prior art, active boost type pfc circuit output voltage fixed sample circuit only need be changed into adjustable sample circuit by the utility model, increase output sampled voltage and input sample voltage comparator circuit control the output of active boost type PFC control chip simultaneously, realize the buck that pfc circuit exports, structure is simple, with low cost, by active boost type, the advantage of the active voltage-dropping type of part and the three kinds of power factor corrections of active buck-boost type rolls into one, output voltage can regulate, when exporting low pressure, forced commutation and natural commutation hocket, except remaining the advantage of the active voltage-dropping type PFC of part, utilize the Voltage loop of active boost type control chip, keep input current and input voltage homophase, and output voltage does not change with the change of load, utilize the electric current loop of active boost type control chip, keep the waveform of input current close to sinusoidal wave, switching time, point controlled automatically simultaneously, without the need to input voltage zero cross detection circuit and independent design MCU, and when exporting high pressure, adopt forced commutation, remain all advantages of active boost type PFC.
Accompanying drawing explanation
Fig. 1 is the Switching Power Supply theory diagram be made up of active boost type PFC.
Fig. 2 is the change rectification buck PFC control circuit of the utility model embodiment.
Fig. 3 is the switching power circuit that application the utility model becomes rectification buck PFC control circuit.
In Fig. 2: 1, input voltage sample circuit, 2, output voltage is adjustable sample circuit, 3, comparison circuit, 4, switching circuit.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
As shown in Figure 2, the present embodiment provides a kind of and becomes rectification buck PFC control circuit, comprise input voltage sample circuit (1), output voltage is adjustable sample circuit (2), comparison circuit (3) and switching circuit (4), it is characterized in that: the output voltage Vin after input voltage sample circuit (1) and rectifier bridge stack, comparison circuit (3) connects, the output voltage Vout of output voltage is adjustable sample circuit (2) and pfc circuit, comparison circuit (3) connects, comparison circuit (3) and input voltage sample circuit (1), output voltage is adjustable sample circuit (2), switching circuit (4) connects, switching circuit (4) and comparison circuit (3), the output Out of active boost type PFC control chip connects, input voltage sample circuit (1) is by two resistance R1, R2 is formed, the upper end of resistance R1 is connected with the output voltage Vin after rectifier bridge stack, the lower end of resistance R1 and the upper end of resistance R2, the in-phase input end of comparison circuit connects, the lower end ground connection of resistance R2, output voltage is adjustable, and sample circuit (2) is made up of two fixed resistances R3, R4 and variable resistor R5, the upper end of resistance R3 is connected with the output voltage Vout of pfc circuit, the lower end of resistance R3 is connected with the upper end of resistance R4, the inverting input of comparison circuit, the lower end of resistance R4 is connected with the upper end of variable resistor R5, the lower end ground connection of variable resistor R5, comparison circuit (3) is made up of comparator OP, the inverting input of comparator OP is connected with the lower end of the upper end of resistance R4, resistance R3, the in-phase input end of comparator OP is connected with the lower end of the upper end of resistance R2, resistance R1, and the output of comparator OP is connected with the left end of resistance R6, switching circuit (4) is made up of resistance R6 and triode Q1, the left end of resistance R6 is connected with the output of comparator OP, the right-hand member of resistance R6 is connected with the base stage of triode Q1, the collector electrode of triode Q1 is connected with the output Out of active boost type PFC control chip, the grounded emitter of triode Q1.
Better the utility model is understood in order to allow general personnel, below in conjunction with Fig. 3, implementation process of the present utility model is simply introduced, when regulation output voltage sample resistance R5 makes the output voltage Vout of pfc circuit be 280-300V, output voltage Vin now after rectifier bridge stack is greater than the output voltage Vout of pfc circuit in a period of time near peak value, all the other time periods are then less than the output voltage Vout of pfc circuit, comparator OP compares input, export sample voltage value, when input voltage is greater than output voltage, comparator OP exports high level, triode Q1 is operated in saturation condition, the output of active boost type PFC control chip controls metal-oxide-semiconductor T and is in cut-off state, after rectifier bridge stack output voltage Vin charged to electric capacity C2 by diode D5, whole pfc circuit is operated in natural commutation state, when the output voltage Vin after rectifier bridge stack is less than the output voltage Vout of pfc circuit, comparator OP output low level, triode Q1 is operated in cut-off state, and active boost type PFC control chip controls metal-oxide-semiconductor T work, and whole pfc circuit is operated in forced commutation pressure-increasning state, when regulation output voltage sample resistance R5 makes output voltage be 380-400V, now rectified current breaking the bridge heap after output voltage Vin within the whole cycle, be all less than output voltage Vout, comparator OP output low level always, triode Q1 ends always, active boost type PFC control chip controls metal-oxide-semiconductor T work, and whole pfc circuit always works in forced commutation pressure-increasning state.
The foregoing is only preferred embodiment of the present utility model, all equalizations done according to the utility model patent claim change and modify, and all should belong to covering scope of the present utility model.
Claims (5)
1. one kind becomes rectification buck PFC control circuit, comprise input voltage sample circuit (1), output voltage is adjustable sample circuit (2), comparison circuit (3) and switching circuit (4), it is characterized in that: the output voltage Vin after input voltage sample circuit (1) and rectifier bridge stack, comparison circuit (3) connects, the output voltage Vout of output voltage is adjustable sample circuit (2) and pfc circuit, comparison circuit (3) connects, comparison circuit (3) and input voltage sample circuit (1), output voltage is adjustable sample circuit (2), switching circuit (4) connects, switching circuit (4) and comparison circuit (3), the output Out of active boost type PFC control chip connects.
2. one according to claim 1 becomes rectification buck PFC control circuit, it is characterized in that, input voltage sample circuit (1) is made up of two resistance R1, R2, the upper end of resistance R1 is connected with the output voltage Vin after rectifier bridge stack, the lower end of resistance R1 is connected with the upper end of resistance R2, the in-phase input end of comparison circuit, the lower end ground connection of resistance R2.
3. one according to claim 1 becomes rectification buck PFC control circuit, it is characterized in that, output voltage is adjustable, and sample circuit (2) is made up of two fixed resistances R3, R4 and variable resistor R5, the upper end of resistance R3 is connected with the output voltage Vout of pfc circuit, the lower end of resistance R3 is connected with the upper end of resistance R4, the inverting input of comparison circuit, the lower end of resistance R4 is connected with the upper end of variable resistor R5, the lower end ground connection of variable resistor R5.
4. one according to claim 1 becomes rectification buck PFC control circuit, it is characterized in that, comparison circuit (3) is made up of comparator OP, the inverting input of comparator OP is connected with the lower end of the upper end of resistance R4, resistance R3, the in-phase input end of comparator OP is connected with the lower end of the upper end of resistance R2, resistance R1, and the output of comparator OP is connected with the left end of resistance R6.
5. one according to claim 1 becomes rectification buck PFC control circuit, it is characterized in that, switching circuit (4) is made up of resistance R6 and triode Q1, the left end of resistance R6 is connected with the output of comparator OP, the right-hand member of resistance R6 is connected with the base stage of triode Q1, the collector electrode of triode Q1 is connected with the output Out of active boost type PFC control chip, the grounded emitter of triode Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420410279.6U CN204103757U (en) | 2014-07-21 | 2014-07-21 | A kind of change rectification buck PFC control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420410279.6U CN204103757U (en) | 2014-07-21 | 2014-07-21 | A kind of change rectification buck PFC control circuit |
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|---|---|
| CN204103757U true CN204103757U (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420410279.6U Expired - Fee Related CN204103757U (en) | 2014-07-21 | 2014-07-21 | A kind of change rectification buck PFC control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549562A (en) * | 2017-01-23 | 2017-03-29 | 余杰 | A kind of crystal triode PFC circuits |
-
2014
- 2014-07-21 CN CN201420410279.6U patent/CN204103757U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549562A (en) * | 2017-01-23 | 2017-03-29 | 余杰 | A kind of crystal triode PFC circuits |
| CN106549562B (en) * | 2017-01-23 | 2019-07-26 | 余杰 | A kind of transistor PFC route |
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| 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: 20150114 Termination date: 20150721 |
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| EXPY | Termination of patent right or utility model |