CN102916573B - Vcc power supply voltage starting circuit of power factor corrector (PFC) and switching power supply applying Vcc power supply voltage starting circuit - Google Patents
Vcc power supply voltage starting circuit of power factor corrector (PFC) and switching power supply applying Vcc power supply voltage starting circuit Download PDFInfo
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- CN102916573B CN102916573B CN201210446222.7A CN201210446222A CN102916573B CN 102916573 B CN102916573 B CN 102916573B CN 201210446222 A CN201210446222 A CN 201210446222A CN 102916573 B CN102916573 B CN 102916573B
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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 relates to a Vcc power supply voltage starting circuit of a power factor corrector (PFC) and a switching power supply applying the Vcc power supply voltage starting circuit. The starting circuit comprises an alternating current peak value sampling end, a PFC output voltage sampling end, a capacitor C2, a diode D6, an operational amplifier OP1, a transistor Q2, a transistor Q3 and seven resistors, wherein the alternating current peak value sampling end is connected with the positive end of the diode D6; the negative end of the diode D6 is connected with one end of the capacitor C2 and one end of the resistor R2; the other end of the capacitor C2 and one end of the resistor R3 are grounded; the other end of the resistor R3 and the other end of the resistor R2 are connected with the negative input end of the operational amplifier OP1; the PFC output voltage sampling end is connected with one end of the resistor R4; and the other end of the resistor R4 is connected with the positive input end of the operational amplifier OP1 and one end of the resistor R5. Under the quick switching condition, the starting circuit can stop saturation of boosting inductance of the PFC, and the problem that electronic parts in a PFC circuit of the conventional switching power supply are damaged due to saturation is solved.
Description
Technical field
The present invention relates to switch power technology field, particularly a kind of PFC Vcc supply power voltage open circuit and apply its Switching Power Supply.
Background technology
Refer to Fig. 1, Fig. 1 traditional has circuit of power factor correction (PowerFactorCorrection Circuit, be called for short: pfc circuit, power factor refers to the relation between effective power and total power consumption (apparent power), and namely effective power is divided by the ratio of total power consumption (apparent power).Substantially power factor (PF) can weigh the degree that electric power is used effectively, and when power factor (PF) value is larger, represents its electric power utilance higher.) Switching Power Supply; In figure, AC mains (90Vrms ~ 264Vrms) carries out carrying out full-wave rectification by bridge rectifier after EMI filtering from the L input (the live wire end got access to grid) of Switching Power Supply and N input (zero line side got access to grid) through EMI filter circuit 1, and this bridge rectifier comprises: D1 ~ D4 diode; Voltage after full-wave rectification (is called for short: pfc circuit through circuit of power factor correction, comprise: the electronic component such as PFC boost inductance L 1, rectifier diode D5, power transistor Q1, Power Factor Correction Control chip U1, current sense resistance R1) boosting after, the direct current that a voltage is about about 400V is generated at high pressure bulky capacitor C1 anode, the direct current of this about 400V is supplied to after main power conversion circuit 2 changes, generate a low-voltage DC, as: 24V direct current is as the energization input voltage of liquid crystal panel lamp tube drive circuit 3; This 400V direct current generates another low-voltage DC after being supplied to standby power change-over circuit 4 conversion, as: 5V direct current is as the energization input voltage of main substrate image processing circuit 5 (MainBoard circuit); The Vcc power supply circuits of standby power change-over circuit 4 inside (graphic do not draw) are by generation one Vcc supply power voltage, this voltage is except being supplied to the pwm chip work of this standby power change-over circuit inside, also be input to Vcc power-supplying circuit 6, whether output one PS_on signal control Vcc power-supplying circuit 6 will be exported this Vcc supply power voltage by main substrate image processing circuit 5 is powered to the pwm chip in Power Factor Correction Control chip U1 and main power conversion circuit 2.
When liquid crystal display product needs to enter standby mode, output one PS_on low level signal (Low) is carried out control Vcc power-supplying circuit 6 and stops output Vcc supply power voltage power to the pwm chip in Power Factor Correction Control chip U1 and main power conversion circuit 2, to allow liquid crystal display product more power saving in the standby state by main substrate image processing circuit 5; When working properly, output one PS_on high level signal (High) is carried out control Vcc power-supplying circuit 6 and exports Vcc supply power voltage and power to the pwm chip in Power Factor Correction Control chip U1 and main power conversion circuit 2 by main substrate image processing circuit 5.Continue referring to Fig. 1, Switching Power Supply shown in Fig. 1 is high voltage at input AC electricity, as: more than 220Vrms and this Switching Power Supply is being done under high-speed switch (on/off) condition, when ac input end voltage turns off (turn off), fall under the voltage of high pressure bulky capacitor C1 starts, when dropping to, as: V
c1during=80V, standby power change-over circuit 4 still can normally work, Vcc power-supplying circuit 6 still provides a Vcc supply power voltage to Power Factor Correction Control chip U1, make this control chip U1 still in running order, now, if this Switching Power Supply input terminal voltage is opened (turn on) more fast, that one end moment of the inductance L 1 be connected with diode D3/D4 negative terminal can produce a maximum voltage value, as: the high pressure of more than 310V, inductance L 1 two ends are made to produce a larger voltage difference, as: the voltage difference of more than 230V, inductance L 1 is made to produce a large impulse current I instantaneously
surge, as: I
surge=40A, its current path: L1 inductance → D5 diode anode → D5 diode negative terminal → high pressure bulky capacitor C1 anode, inductance L 1 is made to be in complete saturation conduction state instantaneously (when flowing through after inductive current reaches certain value, magnetic flux density in inductance core is no longer along with magnetic field intensity is directly proportional increase, now inductance just starts to occur saturation conduction state, during inductance saturation conduction, inductance value can interrogate speed decay, and the electric current news speed flowing through inductance is increased.), causing L1 inductance value to interrogate speed instantaneously decays also close without sensibility reciprocal state, now, if when PFC MOS Q1 is by control chip U1turn on, inductance L 1 two ends will produce larger electric current, its current path: L1 inductance → Q1MOS pipe drain electrode → Q1MOS pipe source electrode → R1 power resistor, Q1MOS is finally caused to manage, R1 power resistor and control chip U1 destroyed, therefore existing PFC chip producer all can advise that engineer needs at diode D3 when designing, D4 negative terminal increases by a diode D7 between high pressure bulky capacitor C1 anode, make this Switching Power Supply at high-speed switch time, charged to high pressure bulky capacitor C1 anode by diode D7, saturation problem is produced to prevent PFC inductance L 1.
Refer to Fig. 2, Fig. 2 to be existingly applied on large scale liquid crystal display product the Switching Power Supply example that has Power Correction Factor circuit (be called for short: pfc circuit).In this pfc circuit, D7 diode adopts usually, as: 1N5408 model diode, it adopts the packaged type of DO-201AD, this 1N5408 diode inserts in power panel after usually needing that both positive and negative polarity both sides pin is curved 90 degree again and uses, the pin encapsulated due to this DO-201AD is thicker, when producer is in machine-shaping, easily occur that body interior is subject to slight damage because body is stressed, and more difficult by 100% discovery, if this problematic diode is installed in power panel use, in the middle of the work in later stage, easily make reverse leakage current I
rsignificantly increase, make this diode D7 body temperature increase, and temperature rising can cause reverse leakage current I
rthe continuous increase that continues, causes I
rvicious circle constantly increases, this diode D7 body is made to produce high temperature, separately, because this pfc circuit belongs to booster circuit, that is: operationally output (negative terminal of the D5 diode) voltage of pfc circuit is always greater than PFC input (D3, D4 diode negative terminal), therefore when pfc circuit works, diode D7 can be in reverse state for a long time, if on power panel, diode D7 part raw material own are bad occur that reverse leakage current is bigger than normal, also this diode D7 body temperature can be made to increase, and temperature rising can cause reverse leakage current I
rthe continuous increase that continues, causes I
rvicious circle constantly increases, and makes this diode D7 body produce high temperature, makes the part of this diode D7 periphery and pcb board by high temperature cabonization, finally causes power panel to burn plate problem.
Summary of the invention
In view of this, the object of this invention is to provide the Vcc supply power voltage open circuit of a kind of PFC, this circuit can stop PFC boost inductance saturated under high-speed switch condition, can eliminate the above-mentioned power panel caused because using D7 diode and occur burning plate problem.
The present invention adopts following scheme to realize: the Vcc supply power voltage open circuit of a kind of PFC, is characterized in that: comprise an alternating current peak value sampling end, a PFC output voltage sampling end, electric capacity C2, diode D6, an amplifier OP1, transistor Q2, transistor Q3, resistance R2, R3, R4, R5, R6, R7 and R8; Described alternating current peak value sampling end is connected with the anode of described diode D6, and the negative terminal of described diode D6 is connected with one end of described electric capacity C2 one end and resistance R2; The other end of described electric capacity C2 and one end ground connection of described resistance R3, the other end of described resistance R3, R2 is connected with the negative input end of described amplifier OP1; One end of described PFC output voltage sampling end connecting resistance R4, the other end of this resistance R4 is connected with one end of the positive input terminal of described amplifier OP1 and resistance R5; The other end of described resistance R5 and the ground end ground connection of this amplifier OP1; One end of resistance R6 described in the output termination of described amplifier OP1, the other end of this resistance R6 is connected with the base stage of described transistor Q2; The grounded emitter of described transistor Q2, the collector electrode of this transistor Q2 is connected with one end of resistance R8, the other end of described resistance R8 is connected with one end of the base stage of transistor Q3 and resistance R7, and the described resistance R7 other end is connected with the emitter of transistor Q3 and the energization input of amplifier OP1; The collector electrode of described transistor Q3 is as the power supply output of this circuit, and the emitter of this transistor Q3 is as the input of outside Vcc supply power voltage.
In an embodiment of the present invention, described transistor Q2 is NPN transistor, and described transistor Q3 is PNP transistor; Ground described in another the present invention all refers to the primary side ground in Switching Power Supply, is also the transformer primary side ground of Switching Power Supply inside.
Another object of the present invention is to provide a kind of Switching Power Supply applying the Vcc supply power voltage open circuit of above-mentioned PFC.
The present invention adopts following scheme to realize: the Switching Power Supply of the Vcc supply power voltage open circuit of the PFC described in application, comprising: an EMI filter circuit, a bridge rectifier, a pfc circuit, a high pressure bulky capacitor C1, a main power conversion circuit, a standby power change-over circuit and a Vcc power-supplying circuit, AC mains (90Vrms ~ 264Vrms) is from the L input (the live wire end got access to grid) of Switching Power Supply and N input (zero line side got access to grid) input voltage as pfc circuit after EMI filter circuit 1 carries out being undertaken by bridge rectifier after EMI filtering full-wave rectification, this voltage exports the direct current that is about about 400V after pfc circuit boosting, the output end voltage of described pfc circuit carries out exporting after voltage transitions a direct voltage through described main power conversion circuit and to power input voltage as a liquid crystal panel lamp tube drive circuit, described pfc circuit output carries out exporting after voltage transitions another direct voltage through standby power change-over circuit and to power input voltage as a main substrate image processing circuit, described standby power change-over circuit exports a Vcc supply power voltage by inner Vcc power supply circuits and is supplied to Vcc power-supplying circuit, the anode of described high pressure bulky capacitor C1 connects and between the output of described pfc circuit and main power conversion circuit input, other end ground connection, it is characterized in that: also comprise above-mentioned Vcc supply power voltage open circuit, the alternating current peak value sampling end of this Vcc supply power voltage open circuit connects the N end (connecting that one end of electrical network zero line side) of described EMI filter circuit output or the either end of L end (connecting that one end of electrical network live wire end), described PFC output voltage sampling end connects the anode of described high pressure bulky capacitor C1, described power supply output provides Vcc supply power voltage for described pfc circuit and main power conversion circuit, the output of described Vcc power-supplying circuit is connected with described outside Vcc voltage input end.
In an embodiment of the present invention: described pfc circuit comprises a PFC boost inductance L 1, rectifier diode D5, power transistor Q1, a PFC control chip and a current sense resistance R1; Described power supply output is connected with the Vcc input of described PFC control chip; CS end (current detecting pin) of described PFC control chip is connected with one end of described current sense resistance R1, the other end ground connection of described current sense resistance R1; The grid of described power transistor Q1 holds (the pwm signal output pin of PFC control chip) to be connected with the OUT of described PFC control chip, source electrode is connected with one end of described current sense resistance R1, and drain electrode is connected with one end of described PFC boost inductance L 1 and the anode of rectifier diode D5; The other end of described PFC boost inductance L 1 is connected with the output of described bridge rectifier, and input and the high pressure bulky capacitor C1 anode of the negative terminal of described rectifier diode D5 and described main power conversion circuit and standby power change-over circuit are connected.
Open circuit of the present invention can stop PFC boost inductance saturated under high-speed switch condition, avoiding the PFC inductance under high-speed switch condition of traditional switch power supply as shown in Figure 1 to produce full conjunction causes the electronic components such as PFC metal-oxide-semiconductor to damage problem, and the reverse leakage current of diode D7 is bigger than normal or the bad reverse leakage current that causes of the raw material of diode D7 electronic component own is bigger than normal because the machine-shaping of diode D7 part causes to avoid traditional switch power supply as shown in Figure 2, make when working long hours, diode D7 body temperature continues to rise, finally be directed at power panel by diode D7 high temperature cabonization and burning plate problem.Apply the Switching Power Supply of this open circuit, not only ensure that the useful life of power supply, and improve the stability of system, there is good practical value.
Accompanying drawing explanation
Fig. 1 is early stage PFC switching power circuit theory diagram.
Fig. 2 is the switching power circuit theory diagram that the existing input at Fig. 1 pfc circuit and output increase by a diode D7.
Fig. 3 is the Vcc supply power voltage open circuit of embodiment of the present invention PFC.
Fig. 4 is the Switching Power Supply of embodiment of the present invention application Vcc supply power voltage open circuit.
Wherein, 1 is EMI filter circuit; 2 is main power conversion circuit; 3 is liquid crystal panel lamp tube drive circuit; 4 is standby power change-over circuit; 5 is main substrate image processing circuit; 6 is Vcc power-supplying circuit; 7 is Vcc supply power voltage open circuit.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 3, the present embodiment provides the Vcc supply power voltage open circuit of a kind of PFC, it is characterized in that: comprise an alternating current peak value sampling end CY1, a PFC output voltage sampling end CY2, electric capacity C2, diode D6, an amplifier OP1, transistor Q2, transistor Q3, resistance R2, R3, R4, R5, R6, R7 and R8; Described alternating current peak value sampling end is connected with the anode of described diode D6, and the negative terminal of described diode D6 is connected with one end of described electric capacity C2 and one end of resistance R2; The other end of described electric capacity C2 and one end ground connection of described resistance R3, the other end of described resistance R3, R2 is connected with the negative input end of described amplifier OP1; One end of described PFC output voltage sampling end connecting resistance R4, the other end of this resistance R4 is connected with one end of the positive input terminal of described amplifier OP1 and resistance R5; The other end of described resistance R5 and the ground end ground connection of this amplifier OP1; One end of resistance R6 described in the output termination of described amplifier OP1, the other end of this resistance R6 is connected with the base stage of described transistor Q2; The grounded emitter of described transistor Q2, the collector electrode of this transistor Q2 is connected with one end of resistance R8, the described resistance R8 other end is connected with the base stage of transistor Q3 and one end of resistance R7, and the described resistance R7 other end is connected with the emitter of transistor Q3 and the energization input of amplifier OP1; The collector electrode of described transistor Q3 is as the power supply output Uo of this circuit, and the emitter of this transistor Q3 is as outside Vcc voltage input end.
Refer to Fig. 4, Fig. 4 is the Switching Power Supply applying above-mentioned Vcc supply power voltage open circuit, and it comprises an EMI filter circuit, a bridge rectifier, a pfc circuit, a high pressure bulky capacitor C1, a main power conversion circuit, a standby power change-over circuit and a Vcc power-supplying circuit, AC mains (90Vrms ~ 264Vrms) carries out after EMI filtering by bridge rectifier (diode D1 from the L input (the live wire end got access to grid) of Switching Power Supply and N input (zero line side got access to grid) through EMI filter circuit 1, D2, D3, D4) input voltage as pfc circuit after full-wave rectification is carried out, this voltage exports the direct current that is about about 400V after pfc circuit boosting, the output end voltage of described pfc circuit carries out exporting after voltage transitions a direct voltage through described main power conversion circuit and to power input voltage as a liquid crystal panel lamp tube drive circuit, described pfc circuit output carries out exporting after voltage transitions another direct voltage through standby power change-over circuit and to power input voltage as a main substrate image processing circuit, , described standby power change-over circuit is exported a Vcc supply power voltage by inner Vcc power supply circuits (graphic do not draw) and is supplied to Vcc power-supplying circuit, the anode of described high pressure bulky capacitor C1 connects and between the output of described pfc circuit and main power conversion circuit input, negativing ending grounding, it is characterized in that: also comprise above-mentioned Vcc supply power voltage open circuit, the alternating current peak value sampling end of this Vcc supply power voltage open circuit connects the N end (connecting that one end of electrical network zero line side) of described EMI filter circuit output or the either end of L end (connecting that one end of electrical network live wire end), described PFC output voltage sampling end connects the anode of described high pressure bulky capacitor C1, described power supply output provides Vcc supply power voltage for described pfc circuit and main power conversion circuit, the output of described Vcc power-supplying circuit is connected with described outside Vcc voltage input end.
Continue referring to Fig. 4, as can be seen from the figure, this circuit eliminates the D7 diode in Fig. 2, increase the Vcc supply power voltage open circuit of a PFC simultaneously, with guarantee Switching Power Supply at high-speed switch time, inductance L 1 there will not be when PFC starts working any inductance saturation problem (when inductance L 1 is saturated, due to inductance value news speed decay, the current anomaly flow through between Q1MOS drain electrode and source electrode is increased, easily causes Q1MOS, power resistor R1, control chip U1 to damage problem).In the present embodiment, this open circuit is by D6 diode, and (this D6 diode optional price is cheap, as: the diode of FR107 or 1N4007 model) and electric capacity C2 sample the crest voltage of input AC electricity, makes electric capacity C2 both end voltage to be
(supposing that input electricity is 220Vrms), now go back demand fulfillment: t=(R2+R3) * C2 > > 1/50, that is: a discharge and recharge constant will much larger than the one-period time of input AC electricity, therefore general R2, R3 resistance needs the resistance selecting more than M Ω level, making the negative input end voltage of amplifier OP1 obtain a fixed voltage is V
-=V
c2* R3/ (R2+R3).This open circuit is sampled by R4, R5 resistance the voltage V of high pressure bulky capacitor C1 anode
c1, making the positive input terminal of amplifier OP1 detect C1 both end voltage is V
+=V
c1* R5/ (R4+R5).In addition, the ratio arranging R3/ (R2+R3) needs to be slightly smaller than R5/ (R4+R5) ratio, make this Switching Power Supply in switching on and shutting down fast time, the voltage of high pressure bulky capacitor C1 be charged to the peak of AC-input voltage (as: 310V) quite or slightly low-voltage (as: 300V) time, the output of amplifier OP1 is just sent a high level signal and is made Q2NPN transistor turns, thus make Q3PNP transistor turns, now the feeder ear Vcc of the U1 (power input pin) of PFC control chip U1 just receives the Vcc supply power voltage that Vcc power-supplying circuit 6 exports, PFC is made to start normal work, before pfc circuit is started working, because the voltage on high TV university electric capacity C1 is substantially equal with ac input end voltage peak, that is: ac input end electric current terminates to C1 capacitor charging substantially through inductance L 1 and diode D5, the electric current flow through in inductance L 1 is very little, make the inductance when pfc circuit is started working can not be in saturated operating state, the traditional switch power supply PFC inductance under high-speed switch condition avoided as shown in Figure 1 produces the saturated electronic components such as PFC metal-oxide-semiconductor that cause and damages problem, and the reverse leakage current of diode D7 is bigger than normal or the bad reverse leakage current that causes of the raw material of diode D7 electronic component own is bigger than normal because the machine-shaping of diode D7 part causes to avoid traditional switch power supply as shown in Figure 2, make when working long hours, diode D7 body temperature continues to rise, finally cause power panel by diode D7 high temperature cabonization and burn plate problem.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (4)
1. a Vcc supply power voltage open circuit of PFC, is characterized in that: comprise an alternating current peak value sampling end, a PFC output voltage sampling end, electric capacity C2, diode D6, an amplifier OP1, transistor Q2, transistor Q3, resistance R2, R3, R4, R5, R6, R7 and R8; Described alternating current peak value sampling end is connected with the anode of described diode D6, and the negative terminal of described diode D6 is connected with one end of described electric capacity C2 one end and resistance R2; The other end of described electric capacity C2 and one end ground connection of described resistance R3, the other end of described resistance R3, R2 is connected with the negative input end of described amplifier OP1; One end of described PFC output voltage sampling end connecting resistance R4, the other end of this resistance R4 is connected with one end of the positive input terminal of described amplifier OP1 and resistance R5; The other end of described resistance R5 and the ground end ground connection of this amplifier OP1; One end of resistance R6 described in the output termination of described amplifier OP1, the other end of this resistance R6 is connected with the base stage of described transistor Q2; The grounded emitter of described transistor Q2; the collector electrode of this transistor Q2 is connected with one end of resistance R8; the other end of described resistance R8 is connected with the base stage of one end of resistance R7 and transistor Q3, and the emitter of described transistor Q3 is connected with the energization input of the resistance R7 other end and amplifier OP1; The collector electrode of described transistor Q3 is as the power supply output of this circuit, and the emitter of this transistor Q3 is as outside Vcc voltage input end.
2. the Vcc supply power voltage open circuit of PFC according to claim 1, it is characterized in that: described transistor Q2 is NPN transistor, described transistor Q3 is PNP transistor.
3. application rights requires a Switching Power Supply for the Vcc supply power voltage open circuit of the PFC described in 1, comprises an EMI filter circuit, a bridge rectifier, a pfc circuit, a high pressure bulky capacitor C1, a main power conversion circuit, a standby power change-over circuit and a Vcc power-supplying circuit; AC mains gives described pfc circuit through this EMI filter circuit, bridge rectifier after carrying out EMI filtering and full-wave rectification; The output end voltage of described pfc circuit carries out exporting after voltage transitions a direct voltage through described main power conversion circuit and to power input voltage as a liquid crystal panel lamp tube drive circuit, the output end voltage of described pfc circuit carries out exporting after voltage transitions another direct voltage through standby power change-over circuit and to power input voltage as a main substrate image processing circuit, and described standby power change-over circuit exports a Vcc supply power voltage by inner Vcc power supply circuits and is supplied to Vcc power-supplying circuit; The anode of described high pressure bulky capacitor C1 is connected between the output of described pfc circuit and main power conversion circuit input, negativing ending grounding; It is characterized in that: also comprise Vcc supply power voltage open circuit as claimed in claim 1, the alternating current peak value sampling end of this Vcc supply power voltage open circuit connects the N end of described EMI filter circuit output or the either end of L end; Described PFC output voltage sampling end connects the anode of described high pressure bulky capacitor C1; Described power supply output provides Vcc supply power voltage for described pfc circuit and main power conversion circuit; The output of described Vcc power-supplying circuit is connected with described outside Vcc voltage input end.
4. application rights according to claim 3 requires the Switching Power Supply of the Vcc supply power voltage open circuit of the PFC described in 1, it is characterized in that: described pfc circuit comprises a PFC boost inductance L 1, rectifier diode D5, power transistor Q1, a PFC control chip and a current sense resistance R1; Described power supply output is connected with the Vcc input of described PFC control chip; The CS end of described PFC control chip is connected with one end of described current sense resistance R1, the other end ground connection of described current sense resistance R1; The grid of described power transistor Q1 is held with the OUT of described PFC control chip and is connected, and source electrode is connected with one end of described current sense resistance R1, and drain electrode is connected with one end of described PFC boost inductance L 1 and the anode of rectifier diode D5; The other end of described PFC boost inductance L 1 is connected with the output of described bridge rectifier, and input and the high pressure bulky capacitor C1 anode of the negative terminal of described rectifier diode D5 and described main power conversion circuit and standby power change-over circuit are connected.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210446222.7A CN102916573B (en) | 2012-11-09 | 2012-11-09 | Vcc power supply voltage starting circuit of power factor corrector (PFC) and switching power supply applying Vcc power supply voltage starting circuit |
| TW102103229A TWI478471B (en) | 2012-11-09 | 2013-01-28 | Startup circuit of supply voltage for pfc circuit and switching power supply using the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210446222.7A CN102916573B (en) | 2012-11-09 | 2012-11-09 | Vcc power supply voltage starting circuit of power factor corrector (PFC) and switching power supply applying Vcc power supply voltage starting circuit |
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| Publication Number | Publication Date |
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| CN102916573A CN102916573A (en) | 2013-02-06 |
| CN102916573B true CN102916573B (en) | 2015-06-03 |
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| CN108448538A (en) * | 2018-04-03 | 2018-08-24 | 深圳茂硕电子科技有限公司 | A kind of overvoltage crowbar and its method |
| CN109889025B (en) * | 2019-03-28 | 2020-09-04 | 深圳市鹏源电子有限公司 | Drive circuit, bridge circuit and switching power supply |
| EP4199334A4 (en) * | 2020-08-24 | 2023-10-11 | Huawei Digital Power Technologies Co., Ltd. | High-power factor rectification circuit and power converter |
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| TWM363021U (en) * | 2009-03-13 | 2009-08-11 | Top Victory Invest Ltd | Power detector and power supply |
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| CN201489092U (en) * | 2009-04-21 | 2010-05-26 | 冠捷投资有限公司 | Power detector and power supply |
| CN201577034U (en) * | 2009-04-21 | 2010-09-08 | 冠捷投资有限公司 | Distributed power supply |
| CN102244470A (en) * | 2010-05-11 | 2011-11-16 | 联昌电子企业股份有限公司 | Supply apparatus and power supply method |
| KR101734542B1 (en) * | 2010-07-16 | 2017-05-11 | 엘지이노텍 주식회사 | Protection Apparatus of supplying Power |
| CN202475621U (en) * | 2011-12-31 | 2012-10-03 | 青岛海信电器股份有限公司 | Led liquid crystal television |
| CN203039571U (en) * | 2012-11-09 | 2013-07-03 | 福建捷联电子有限公司 | Vcc power supply voltage switching-on circuit of PFC and switching power supply using same |
-
2012
- 2012-11-09 CN CN201210446222.7A patent/CN102916573B/en not_active Expired - Fee Related
-
2013
- 2013-01-28 TW TW102103229A patent/TWI478471B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| TW201419725A (en) | 2014-05-16 |
| CN102916573A (en) | 2013-02-06 |
| TWI478471B (en) | 2015-03-21 |
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