CN105450054A - PFC (power factor correction) circuit with built-in auxiliary power circuit, and control method and device for PFC circuit - Google Patents
PFC (power factor correction) circuit with built-in auxiliary power circuit, and control method and device for PFC circuit Download PDFInfo
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- CN105450054A CN105450054A CN201410298516.9A CN201410298516A CN105450054A CN 105450054 A CN105450054 A CN 105450054A CN 201410298516 A CN201410298516 A CN 201410298516A CN 105450054 A CN105450054 A CN 105450054A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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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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Abstract
The invention discloses a PFC (power factor correction) circuit with a built-in auxiliary power circuit, and the circuit comprises a PFC circuit which is used for receiving an AC input voltage from an AC power supply, and generating a DC output voltage needed by a load and voltage output of an auxiliary power supply; a PFC load size judgment circuit which receives an output current from the PFC circuit, judges the size of the load of the PFC circuit according to the output current, and outputs a shielding signal to an AC instantaneous voltage detection circuit when the load of the PFC circuit is large; the AC instantaneous voltage detection circuit which receives an AC input voltage of the AC power supply, detects the instantaneous value of the AC input voltage, generates a pulse signal synchronous with the AC input voltage, and enables the pulse signal to be outputted to an enabling end of a PFC control circuit; and the PFC control circuit which controls the PFC circuit to work in a normal working mode when the enabling end receives a high-level pulse signal, and controls the PFC circuit to be in a non-working state when the enabling end receives a low-level pulse signal.
Description
Technical field
The present invention relates to PFC (powerfactorcorrection, power factor correction) technical field, more particularly, relate to a kind of pfc circuit and carry auxiliary power circuit and control method thereof and control device.
Background technology
Fig. 1 is that existing pfc circuit carries auxiliary power circuit.
As described in Figure 1, pfc circuit carries auxiliary power circuit and comprises: rectifier bridge DB1-DB4, receives AC-input voltage, and is DC input voitage by AC-input voltage rectification; Input capacitor CBB2, is parallel between rectifier bridge DB1-DB4, carries out filtering to rectifier bridge output signal; Comprise the PFC Switching Power Supply of inductance L 2, switching tube Q1 and diode D1, in parallel with input capacitor CBB2, export for generation of the direct current needed for load.
Fig. 2 is that the existing pfc circuit comprising PFC control circuit carries auxiliary power circuit.
PFC control circuit is by the work of output drive signal control PFC Switching Power Supply.
Shown in Fig. 1 and Fig. 2 two kind of a PFC inductance is assisted winding can be used as accessory power supply and is powered to control circuit, they have a feature to be exactly almost can not provide energy when PFC very underload or zero load, like this under whole power supply very underload or holding state, stable accessory power supply can not be provided.
Fig. 3 and Fig. 4 shows the existing pfc circuit when PFC underloading and carries the current direction in auxiliary power circuit in inductance L 2.
When PFC underloading, within a power frequency period, PFC control circuit only may send the driving pulse of a string very few number (is also that driving pulse is interrupted, 10msPFC control circuit is only had to send out driving pulse in a such as power frequency period 50ms, load is lighter often, and the time scale of work is shorter) carry out driving switch pipe Q1.The main winding of inductance L 2 and auxiliary winding are couplings, and when having current flowing, main winding and auxiliary winding all induce the voltage of corresponding ratio.
As shown in Figure 3, if pulse sends when instantaneous AC input voltage is high, then after pulse-off, inductance L 2 main winding both sides voltage difference is smaller, and namely voltage drop is little, and the electric current in inductance L 2 can export along the direction of PFC main circuit.
As shown in Figure 4, if pulse sends when instantaneous AC input voltage is low, then during pulse-off, inductance L 2 both sides voltage difference is larger, namely pressure drop is high, because the voltage of inductance L 2 main winding 2 end i.e. input voltage are low, and the voltage of 3 ends i.e. output voltage substantially constant, so pressure drop ratio is larger, the pressure drop of inductance L 2 main winding is large, and inductance L 2 assists winding also can induce larger voltage, and inductance L 2 assists current direction on winding as shown in Figure 4.
The present invention obtains based on the phenomenon in Fig. 3 and Fig. 4 just.
Summary of the invention
Additional aspects of the present invention and advantage part are set forth in the description below, also have part can find out significantly from description, or can obtain in the practice of the invention.
The application is a kind of novel auxiliary power circuit based on pfc circuit, adopt PFC control circuit conducting when AC-input voltage is low when underloading, namely, when the instantaneous value absolute value of alternating voltage is low, PFC control circuit normally works, PFC control circuit is worked near alternating current presses through 0, thus can output be stablized when realizing underloading.
This application discloses a kind of pfc circuit and carry auxiliary power circuit, comprising: pfc circuit, receive the AC-input voltage from AC power, and the VD produced needed for load and accessory power supply voltage export; PFC load decision circuitry, receives the output current from pfc circuit, and judges that the load of pfc circuit is high or low according to this output current, when judging pfc circuit load height, exports shielded signal to alternating current instantaneous voltage detetion circuit; Alternating current instantaneous voltage detetion circuit, receives the AC-input voltage from AC power, detects the instantaneous value of AC-input voltage, generates the pulse signal synchronous with AC-input voltage, and by the Enable Pin of this output of pulse signal to PFC control circuit; PFC control circuit, when its Enable Pin receives the pulse signal of high level, controls pfc circuit work according to normal operation mode, when its Enable Pin receives low level pulse signal, is in non operating state.
Disclosed herein as well is the control device that a kind of pfc circuit carries auxiliary power circuit, this pfc circuit carries out work according to the control of PFC control circuit, this control device comprises: PFC load decision circuitry, receive the output current from pfc circuit, and judge that the load of pfc circuit is high or low according to this output current, when judging pfc circuit load height, export shielded signal to alternating current instantaneous voltage detetion circuit; Alternating current instantaneous voltage detetion circuit, receives the AC-input voltage from AC power, detects the instantaneous value of AC-input voltage, generates the pulse signal synchronous with AC-input voltage, and by the Enable Pin of this output of pulse signal to PFC control circuit.
Disclosed herein as well is the control method that a kind of pfc circuit carries auxiliary power circuit, this pfc circuit carries out work according to the control of PFC control circuit, and this control method comprises: the load detecting pfc circuit is high or low; When detecting that the load of pfc circuit is low, detect AC-input voltage; Generate the pulse signal synchronous with AC-input voltage, and output to PFC control circuit; Described pulse signal controls the in running order or non operating state of PFC control circuit.
Accompanying drawing explanation
Be described in detail the preferred embodiments of the present invention in conjunction with the drawings, above and other object of the present invention, characteristic and advantage will become apparent, and wherein identical label specifies the unit of same structure, and wherein:
Fig. 1 is that existing pfc circuit carries auxiliary power circuit.
Fig. 2 is that the existing pfc circuit comprising PFC control circuit carries auxiliary power circuit.
Fig. 3 and Fig. 4 shows the existing pfc circuit when PFC underloading and carries the current direction in auxiliary power circuit in inductance L 2.
Fig. 5 shows the block diagram carrying auxiliary power circuit according to the pfc circuit of the embodiment of the present invention.
Fig. 6 shows the physical circuit schematic diagram of the alternating current instantaneous voltage detetion circuit according to the embodiment of the present invention.
Fig. 7 A and 7B is the mode controlled PFC control circuit by the pulse signal that alternating current instantaneous voltage detetion circuit exports according to the embodiment of the present invention.
Fig. 8 shows the control method flow chart carrying auxiliary power circuit according to the pfc circuit of the embodiment of the present invention.
Embodiment
Below with reference to illustrating that the accompanying drawing of the embodiment of the present invention fully describes the present invention.But the present invention can realize in many different forms, and not will be understood that and be limited to embodiment described here.On the contrary, provide these embodiments to make the disclosure thorough and complete, and scope of the present invention will be given full expression to those skilled in the art.In the accompanying drawings, for the sake of clarity assembly is exaggerated.
Should be appreciated that when claim " element " " be connected to " or " coupling " to another element time, it can be directly connected or coupled to another element or can there is intermediary element.On the contrary, when claim element " be directly connected to " or " being directly coupled to " another element time, there is not intermediary element.Identical Reference numeral indicates identical element.Term "and/or" used herein comprises any and all combinations of one or more relevant project listed.
Although should be appreciated that and term first, second, third, etc. can be used here to describe each element, assembly and/or part, these elements, assembly and/or part do not limit by these terms.These terms are only for mutually making a distinction element, assembly or part.Therefore, the first element discussed below, assembly or part can be called the second element, assembly or part under the prerequisite not deviating from the present invention's teaching.
Unless otherwise defined, all terms used herein (comprising technology and scientific terminology) have the identical meanings jointly understood with those skilled in the art.It should also be understood that, those terms such as defined in usual dictionary should be interpreted as having the consistent implication of implication with them in the context of correlation technique, and do not apply idealized or extremely formal meaning explain, unless defined so clearly here.
Technical characteristics of the present invention is, by additional control circuit, make pfc circuit when zero load or pole underload, the interrupted driving pulse that PFC control circuit sends is all for the electronegative potential moment sends at input AC electricity, and control PFC control circuit input AC electricity for high potential time do not work, this makes it possible to ensure that there is larger voltage difference at inductance two ends, thus ensure that the auxiliary winding voltage as the inductance of accessory power supply exports.
Fig. 5 shows the block diagram carrying auxiliary power circuit according to the pfc circuit of the embodiment of the present invention.
As shown in Figure 5, pfc circuit carries auxiliary power circuit and comprises: pfc circuit 501, PFC control circuit 503 and control device.This control device comprises alternating current instantaneous voltage detetion circuit 502 and PFC load decision circuitry 504.
Pfc circuit 501 receives the AC-input voltage from AC power, and the direct current produced needed for load exports and accessory power supply voltage exports.
The direct current that PFC load decision circuitry 504 receives from pfc circuit 501 exports, and judges that the load of pfc circuit 501 is high or low according to the output of this direct current.When PFC load decision circuitry 504 judges pfc circuit 501 load high (being fully loaded with), shielding alternating current instantaneous voltage detetion circuit 502.Now, pfc circuit 501 is identical with conventional P FC plug-in accessory power supply operating state.PFC load decision circuitry 504 for the shielding alternating current instantaneous voltage detetion circuit 502 when pfc circuit 501 high capacity, and does not export shielded signal to alternating current instantaneous voltage detetion circuit 502 when pfc circuit 501 low load.
Although the load of PFC shown in Fig. 5 decision circuitry 504 exports according to the direct current from pfc circuit 501 height judging the load of pfc circuit 501, but it should be appreciated by those skilled in the art that PFC load decision circuitry 504 can also judge the height of the load of pfc circuit 501 according to other signals.Such as, usually after pfc circuit, be also connected to dc-dc, PFC load decision circuitry 504 also can receive enable signal or the power output of this dc-dc, and judges the height of the load of pfc circuit 501 accordingly.
Alternating current instantaneous voltage detetion circuit 502 is when receiving the shielded signal from PFC load decision circuitry 504, and do not work (described shielded signal is such as the level that grows tall).And when not receiving the shielded signal from PFC load decision circuitry 504, also namely when pfc circuit 501 underloading or zero load, alternating current instantaneous voltage detetion circuit 502 works.
Alternating current instantaneous voltage detetion circuit 502 receives the AC-input voltage from AC power, the instantaneous value of AC-input voltage is detected, and show that (instant absolute value of such as AC-input voltage is high level lower than this pulse signal during predetermined threshold to a pulse signal synchronous with AC-input voltage, and when the instant absolute value of AC-input voltage is higher than predetermined threshold, this pulse signal is low level), then by the Enable Pin of this output of pulse signal to PFC control circuit 503.
The Enable Pin return pulse signal of PFC control circuit 503.When pulse signal is high level, PFC control circuit 503 is enabled, to control pfc circuit 502 according to normal operation mode to work, i.e. switching tube Q1 conducting or cut-off according to the driving voltage from PFC control circuit 503, and allowing input current waveform floating voltage waveform, the auxiliary winding of the inductance L 2 of pfc circuit 502 induces voltage as accessory power supply output voltage simultaneously.When pulse signal is low level, PFC control circuit 503 is prohibited work.
Adopt the present invention, just can only alternating current instantaneous voltage detetion circuit 502 be made just likely to send high level signal when ac input signal is low, to force PFC control circuit 503 in running order, thus ensure that PFC inductance assists winding output voltage for high.
It should be appreciated by those skilled in the art that pfc circuit 501 and PFC control circuit 503 can adopt existing pfc circuit as illustrated in figs. 1 and 2 and control circuit thereof, also can adopt other suitable pfc circuit and control circuits thereof.
Fig. 6 shows the physical circuit schematic diagram of the alternating current instantaneous voltage detetion circuit 502 according to the embodiment of the present invention.
As shown in Figure 6, alternating current instantaneous voltage detetion circuit 502 comprises the first and second diode D8 and D9, voltage stabilizing didoe ZD3 and triode Q4.The positive pole of the first diode D8 and the positive pole of the second diode D9, as the input of alternating current instantaneous voltage detetion circuit 502, receive the input from AC power.The live wire L that the positive pole of the first diode D8 is coupled to AC power holds, the zero line N that the positive pole of the second diode D9 is coupled to AC power holds, the negative pole of the first diode D8 and the negative pole of the second diode D9 are commonly coupled to the negative pole of voltage stabilizing didoe ZD3, the positive pole of voltage stabilizing didoe ZD3 is coupled to the base stage of triode Q4, the collector electrode of triode Q4 as the output of alternating current instantaneous voltage detetion circuit 502, the grounded emitter of triode Q4.
Alternating current instantaneous voltage detetion circuit 502 also comprises first to fourth resistor R37, R38, R39, R14.First to the 3rd resistor R37-R39 is connected between the negative pole of the first diode D8 and the tie point of negative pole of the second diode D9 and the negative pole of voltage stabilizing didoe ZD3, and the collector electrode of triode Q4 is connected to power supply Vcc by the 4th resistor R14.
Alternating current instantaneous voltage detetion circuit 502 detect that its input receives, from the AC-input voltage of AC power, when the instant absolute value of input voltage being detected lower than predetermined threshold, alternating current instantaneous voltage detetion circuit 502 exports high level pulse signal to PFC control circuit 503 by its output, normally works with enable PFC control circuit 503.When the instant absolute value of input voltage being detected higher than predetermined threshold, alternating current instantaneous voltage detetion circuit 502 is by its output output low level pulse signal, and PFC control circuit 503 is prohibited work.
It should be appreciated by those skilled in the art that alternating current instantaneous voltage detetion circuit 502 is not limited to the circuit shown in Fig. 6, Fig. 6 is only one of implementation of alternating current instantaneous voltage detetion circuit 502.Any circuit of the function of alternating current instantaneous voltage detetion circuit 502 of the present invention can be realized all in protection scope of the present invention.
Fig. 7 A and 7B is the mode controlled PFC control circuit 503 by the pulse signal that alternating current instantaneous voltage detetion circuit 502 exports according to the embodiment of the present invention.
PFC control circuit 503 shown in Fig. 7 A and 7B is existing L6562PFC controller.
As shown in Figure 7 A, the pulse signal that alternating current instantaneous voltage detetion circuit 502 can be exported directly outputs to the zero current detector in PFC control circuit 503, with the current zero-crossing point test section of enable L6562PFC controller.Or as shown in Figure 7 B, the pulse signal that alternating current instantaneous voltage detetion circuit 502 can be exported directly outputs to the driver in PFC control circuit 503, with direct enable PFC pulse output.Applying enable signal by these two kinds of modes can force PFC control circuit 503 not work when AC-input voltage height, and normally works lower than during predetermined threshold at the instant absolute value of AC-input voltage.
Also, namely, when AC-input voltage height, PFC control circuit 503 does not provide driving voltage to the switching tube Q1 of pfc circuit 501 inside; And when the instant absolute value of AC-input voltage is lower than predetermined threshold, PFC control circuit 503 provides driving voltage to the switching tube Q1 of pfc circuit 501 inside.
It should be appreciated by those skilled in the art that PFC control circuit 503 is not limited to the L6562PFC controller shown in Fig. 7, therefore, mode PFC control circuit 503 being added to enable signal is also not limited to the mode shown in Fig. 7.Any circuit of PFC control circuit 503 function of the present invention can be realized and the various modes of enable signal are added all in protection scope of the present invention to this PFC control circuit 503.
Fig. 8 shows the control method flow chart carrying auxiliary power circuit according to the pfc circuit of the embodiment of the present invention.
In step 801, the load detecting pfc circuit is high or low.
In step 802, when the load of pfc circuit is low, detect AC-input voltage.
In step 803, generate the pulse signal synchronous with AC-input voltage, and output to PFC control circuit, wherein, when the instant absolute value of AC-input voltage is lower than predetermined threshold, described pulse signal is high level; When the instant absolute value of AC-input voltage is higher than predetermined threshold, described pulse signal is low level.
In step 804, described pulse signal controls the in running order or non operating state of PFC control circuit, namely normally working when PFC control circuit receives high level pulse signal, not working when receiving low level pulse signal.
The control device carrying the improvement of auxiliary power circuit according to the pfc circuit of the embodiment of the present invention has instantaneous AC input voltage testing circuit, and the output signal of alternating voltage instantaneous value testing circuit is output in PFC control circuit, and under underloading, when AC-input voltage is low, this alternating voltage instantaneous value testing circuit exports high level pulse, and under heavy loads, shield this function of this alternating voltage instantaneous value testing circuit.
Be applicable to utilize the auxiliary winding of pfc circuit as accessory power supply according to the control method of the improvement of the embodiment of the present invention, and require that pfc circuit pole underloading or unloaded this accessory power supply lower also can export (holding state has control circuit work).Such as, the drive circuit of light fixture is with control receiver module, and when light fixture closes (main output is closed), control circuit also will receive remote signal.
The above is to explanation of the present invention, and should not be considered to limitation ot it.Although describe some exemplary embodiments of the present invention, those skilled in the art will easily understand, and can carry out many amendments under the prerequisite not deviating from teaching of the present invention and advantage to exemplary embodiment.Therefore, all such modifications are all intended to be included in the scope of the invention that claims limit.Be to explanation of the present invention above should be appreciated that, and should be considered to be limited to disclosed specific embodiment, and the amendment intention of the disclosed embodiments and other embodiments is comprised within the scope of the appended claims.The present invention is limited by claims and equivalent thereof.
Claims (16)
1. pfc circuit carries an auxiliary power circuit, comprising:
Pfc circuit, receives the AC-input voltage from AC power, and the VD produced needed for load and accessory power supply voltage export;
PFC load decision circuitry, the direct current received from pfc circuit exports, and judges that the load of pfc circuit is high or low according to the output of this direct current, when judging pfc circuit load height, exports shielded signal to alternating current instantaneous voltage detetion circuit;
Alternating current instantaneous voltage detetion circuit, receives the AC-input voltage from AC power, detects the instantaneous value of AC-input voltage, generates the pulse signal synchronous with AC-input voltage, and by the Enable Pin of this output of pulse signal to PFC control circuit;
PFC control circuit, when its Enable Pin receives the pulse signal of high level, controls pfc circuit work according to normal operation mode, when its Enable Pin receives low level pulse signal, is in non operating state.
2. pfc circuit as claimed in claim 1 carries auxiliary power circuit, wherein, when alternating current instantaneous voltage detetion circuit detects the instant absolute value of AC-input voltage lower than predetermined threshold, generate the pulse signal of high level, and when alternating current instantaneous voltage detetion circuit detects the instant absolute value of AC-input voltage higher than predetermined threshold, generate low level pulse signal.
3. pfc circuit as claimed in claim 2 carries auxiliary power circuit, and alternating current instantaneous voltage detetion circuit comprises:
First and second diodes, the positive pole of the first diode and the positive pole of the second diode, as the input of alternating current instantaneous voltage detetion circuit, receive the input from AC power; The live wire L that the positive pole of the first diode is coupled to AC power holds, and the zero line N that the positive pole of the second diode is coupled to AC power holds;
Voltage stabilizing didoe, the negative couplings of voltage stabilizing didoe is to the tie point of the negative pole of the negative pole of the first diode and the second diode;
Triode, the base stage of triode is coupled to the positive pole of voltage stabilizing didoe, the collector electrode of triode as the output of alternating current instantaneous voltage detetion circuit, the grounded emitter of triode.
4. pfc circuit as claimed in claim 3 carries auxiliary power circuit, and alternating current instantaneous voltage detetion circuit also comprises:
First to the 3rd resistor, is connected between the negative pole of the first diode and the tie point of negative pole of the second diode and the negative pole of voltage stabilizing didoe;
4th resistor, the collector electrode of triode is connected to power supply by the 4th resistor.
5. pfc circuit as claimed in claim 4 carries auxiliary power circuit, wherein, also dc-dc is comprised between described pfc circuit and PFC load decision circuitry, PFC load decision circuitry receives enable signal or the power output of this dc-dc, and judges that the load of pfc circuit is high or low according to this enable signal or power output.
6. pfc circuit as claimed in claim 5 carries auxiliary power circuit, and pulse signal is directly outputted to the driver in PFC control circuit by alternating current instantaneous voltage detetion circuit, with direct enable PFC pulse output.
7. pfc circuit carries a control device for auxiliary power circuit, and this pfc circuit carries out work according to the control of PFC control circuit, and this control device comprises:
PFC load decision circuitry, the direct current received from pfc circuit exports, and judges that the load of pfc circuit is high or low according to the output of this direct current, when judging pfc circuit load height, exports shielded signal to alternating current instantaneous voltage detetion circuit;
Alternating current instantaneous voltage detetion circuit, receives the AC-input voltage from AC power, detects the instantaneous value of AC-input voltage, generates the pulse signal synchronous with AC-input voltage, and by the Enable Pin of this output of pulse signal to PFC control circuit.
8. control device as claimed in claim 7, wherein, when alternating current instantaneous voltage detetion circuit detects the instant absolute value of AC-input voltage lower than predetermined threshold, generate the pulse signal of high level, and when alternating current instantaneous voltage detetion circuit detects the instant absolute value of AC-input voltage higher than predetermined threshold, generate low level pulse signal.
9. control device as claimed in claim 8, wherein, when alternating current instantaneous voltage detetion circuit exports the pulse signal of high level, enable PFC control circuit controls pfc circuit work according to normal operation mode, when the pulse signal of alternating current instantaneous voltage detetion circuit output low level, forbid PFC control circuit work.
10. control device as claimed in claim 9, alternating current instantaneous voltage detetion circuit comprises:
First and second diodes, the positive pole of the first diode and the positive pole of the second diode, as the input of alternating current instantaneous voltage detetion circuit, receive the input from AC power; The live wire L that the positive pole of the first diode is coupled to AC power holds, and the zero line N that the positive pole of the second diode is coupled to AC power holds;
Voltage stabilizing didoe, the negative couplings of voltage stabilizing didoe is to the tie point of the negative pole of the negative pole of the first diode and the second diode;
Triode, the base stage of triode is coupled to the positive pole of voltage stabilizing didoe, the collector electrode of triode as the output of alternating current instantaneous voltage detetion circuit, the grounded emitter of triode.
11. control device as claimed in claim 10, alternating current instantaneous voltage detetion circuit also comprises:
First to the 3rd resistor, is connected between the negative pole of the first diode and the tie point of negative pole of the second diode and the negative pole of voltage stabilizing didoe;
4th resistor, the collector electrode of triode is connected to power supply by the 4th resistor.
12. control device as claimed in claim 11, wherein, also dc-dc is comprised between described pfc circuit and PFC load decision circuitry, PFC load decision circuitry receives enable signal or the power output of this dc-dc, and judges that the load of pfc circuit is high or low according to this enable signal or power output.
13. control device as claimed in claim 11, pulse signal is directly outputted to the driver in PFC control circuit by alternating current instantaneous voltage detetion circuit, with direct enable PFC pulse output.
14. 1 kinds of pfc circuits carry the control method of auxiliary power circuit, and this pfc circuit carries out work according to the control of PFC control circuit, and this control method comprises:
The load detecting pfc circuit is high or low;
When detecting that the load of pfc circuit is low, detect AC-input voltage;
Generate the pulse signal synchronous with AC-input voltage, and output to PFC control circuit;
Described pulse signal controls the in running order or non operating state of PFC control circuit.
15. control methods as claimed in claim 14, wherein, when the instant absolute value of AC-input voltage is lower than predetermined threshold, described pulse signal is high level; When the instant absolute value of AC-input voltage is higher than predetermined threshold, described pulse signal is low level.
16. control methods as claimed in claim 15, wherein, when receiving high level pulse signal, PFC control circuit normally works, and forbids PFC control circuit work when receiving low level pulse signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298516.9A CN105450054B (en) | 2014-06-26 | 2014-06-26 | Circuit of power factor correction carries auxiliary power circuit and its control method and device |
| PCT/CN2014/089410 WO2015196672A1 (en) | 2014-06-26 | 2014-10-24 | Auxiliary power source circuit with power factor correction circuit, and control method and device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298516.9A CN105450054B (en) | 2014-06-26 | 2014-06-26 | Circuit of power factor correction carries auxiliary power circuit and its control method and device |
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| Publication Number | Publication Date |
|---|---|
| CN105450054A true CN105450054A (en) | 2016-03-30 |
| CN105450054B CN105450054B (en) | 2018-11-27 |
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| CN201410298516.9A Active CN105450054B (en) | 2014-06-26 | 2014-06-26 | Circuit of power factor correction carries auxiliary power circuit and its control method and device |
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| CN (1) | CN105450054B (en) |
| WO (1) | WO2015196672A1 (en) |
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| CN106714382B (en) * | 2017-01-11 | 2018-05-04 | 福州华芯电子有限公司 | Quantization PFC based on the detection of full voltage wave crest |
| CN113394964A (en) * | 2021-06-15 | 2021-09-14 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and PFC circuit applying same |
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| CN107134922B (en) * | 2017-07-05 | 2023-10-31 | 郑州工业应用技术学院 | Conversion circuit of power supply for instrument |
| CN110086328B (en) * | 2019-06-19 | 2024-05-07 | 深圳莱福德科技股份有限公司 | Power-on time sequence control circuit |
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| CN102801299B (en) * | 2012-07-18 | 2016-03-30 | 华为技术有限公司 | The control method of power factor corrector and uninterrupted power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107395013A (en) * | 2016-05-17 | 2017-11-24 | 亚荣源科技（深圳）有限公司 | Power generation circuit and its operating method |
| CN106714382B (en) * | 2017-01-11 | 2018-05-04 | 福州华芯电子有限公司 | Quantization PFC based on the detection of full voltage wave crest |
| CN113394964A (en) * | 2021-06-15 | 2021-09-14 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and PFC circuit applying same |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015196672A1 (en) | 2015-12-30 |
| CN105450054B (en) | 2018-11-27 |
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