CN202696121U - Power factor correction (PFC) overvoltage protection circuit and switch power supply - Google Patents
Power factor correction (PFC) overvoltage protection circuit and switch power supply Download PDFInfo
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- CN202696121U CN202696121U CN 201220267211 CN201220267211U CN202696121U CN 202696121 U CN202696121 U CN 202696121U CN 201220267211 CN201220267211 CN 201220267211 CN 201220267211 U CN201220267211 U CN 201220267211U CN 202696121 U CN202696121 U CN 202696121U
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Abstract
The utility model discloses a power factor correction (PFC) overvoltage protection circuit and a switch power supply. The PFC overvoltage protection circuit comprises an alternating current power supply input end, a bridge rectifier circuit, a boost inductor, a PFC chip, an output electrolytic capacitor, a direct current power supply output end, a voltage detecting circuit, a control signal generating circuit and a PFC chip power supply control circuit, the boost inductor contains a primary winding and an auxiliary winding, the voltage detecting circuit detects voltage of the auxiliary winding in the boost inductor and outputs the detected voltage to the control signal generating circuit, the control signal generating circuit outputs corresponding control signal to the PFC chip power supply control circuit according to the voltage detected by the voltage detecting circuit, and the PFC chip power supply control circuit switches off or on a working power supply of a PFC chip according to the received control signal. Compared with PFC overvoltage protection circuits in prior art, the PFC overvoltage protection circuit has the advantages that the reliability and stability of the circuit are improved, and the power consumption and cost of the circuit are reduced.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of PFC overvoltage crowbar and Switching Power Supply.
Background technology
At present, in order to improve the utilance of electric energy, and the harmonic pollution that reduces electric energy, pfc circuit (Power Factor Correction, Active PFC) is used more and morely.The function that pfc circuit is mainly realized is that the alternating current with 220V is converted to the high voltage direct current about 380～400V, is the electrochemical capacitor of 450V and the electrochemical capacitor that the pfc circuit output strobes normally adopts withstand voltage.When pfc circuit occurs when unusual; the voltage of its output will be up to 450V or more than the 450V; so that the voltage of the electrochemical capacitor of its output has surpassed its limit withstand voltage; thereby cause this electrochemical capacitor puncture, burn; even light other combustibles of periphery and the initiation fire accident causes burning of electronic equipment, and personal safety is caused a hidden trouble; therefore, in pfc circuit, set up overvoltage crowbar and seem particularly important.
PFC overvoltage crowbar of the prior art normally carries out direct sample by resistance pressure-dividing network (feedback network) to the voltage of the electrochemical capacitor of circuit output end; and with the Voltage Feedback that the is sampled to feedback voltage input pin to PFC chip in the circuit; the PFC chip is according to the voltage of its feedback voltage input pin; the voltage stabilization of control circuit output is in normal voltage range, thus the electrochemical capacitor of protective circuit output.When the overtension of circuit output end, when namely being higher than default threshold voltage, the PFC overvoltage crowbar will be implemented protection and move, and the PFC chip in the circuit is quit work.Yet; when if the feedback loop of PFC chip breaks down (such as short circuit time); then above-mentioned PFC overvoltage crowbar can not be realized normal over-voltage protecting function; thereby cause the electrochemical capacitor of circuit output end puncture, burn, namely there is the lower defective of reliability in this PFC overvoltage crowbar of the prior art.And, because this PFC overvoltage crowbar has been used resistance pressure-dividing network, cause its power consumption higher.
The utility model content
Main purpose of the present utility model provides a kind of PFC overvoltage crowbar, is intended to improve the reliability and stability of circuit, and the power consumption and the cost that reduce circuit.
In order to achieve the above object, the utility model proposes a kind of PFC overvoltage crowbar, this PFC overvoltage crowbar comprises boost inductance and PFC chip, and described boost inductance comprises armature winding and auxiliary winding; Also comprise: for detection of the voltage detecting circuit of the voltage of described auxiliary winding, be used for according to the detected voltage of described voltage detecting circuit, the control signal of output corresponding control signal produces circuit and is used for producing the control signal that circuit produces according to described control signal, cut off or open the PFC chip power control circuit of the working power of described PFC chip, wherein:
The Same Name of Ends of the auxiliary winding in the detection input of described voltage detecting circuit and the described boost inductance is connected, the detection output of described voltage detecting circuit is connected with the input that described control signal produces circuit, the output that described control signal produces circuit is connected with the input of described PFC chip power control circuit, and the output of described PFC chip power control circuit is connected with the power supply input pin of described PFC chip.
Preferably, described voltage detecting circuit comprises the first resistance, the second resistance, the first electric capacity, double diode and the first polar capacitor; Described double diode comprises the first diode and the second diode, the Same Name of Ends of the auxiliary winding in one end of described the first resistance and the described boost inductance is connected, the other end of described the first resistance is connected between the negative electrode of the anode of the first diode in the described double diode and the second diode through described the first electric capacity, the negative electrode of described the first diode is connected with the positive pole of described the first polar capacitor, and through described the second grounding through resistance, the equal ground connection of anode of the negative pole of described the first polar capacitor and described the second diode.
Preferably, described control signal generation circuit comprises voltage stabilizing circuit, bleeder circuit, latching circuit, the 5th resistance, the second electric capacity and the 3rd electric capacity; The negative electrode of the first diode in one end of described voltage stabilizing circuit and the described voltage detecting circuit is connected, the other end of described voltage stabilizing circuit is connected with the input of described bleeder circuit, the output of described bleeder circuit is connected with the input of described latching circuit, and through described the second capacity earth, the output of described latching circuit is the output that described control signal produces circuit, be connected with the input of described PFC chip power control circuit, one end of described the 5th resistance is connected with an end of described the 3rd electric capacity, and be connected with described latching circuit, the other end of described the 5th resistance is connected with the other end of described the 3rd electric capacity, and is connected with the input of described PFC chip power control circuit.
Preferably, described PFC chip power control circuit comprises PFC chip operation power input, the second voltage stabilizing didoe and the 3rd triode; The base stage of described the 3rd triode is the input of described PFC chip power control circuit, the output that produces circuit with described control signal is connected, and be connected with the negative electrode of described the second voltage stabilizing didoe, the plus earth of described the second voltage stabilizing didoe, the collector electrode of described the 3rd triode is connected with described PFC chip operation power input, and the emitter of described the 3rd triode is connected with the power supply input pin of described PFC chip.
Preferably, described voltage stabilizing circuit comprises the first voltage stabilizing didoe, and described bleeder circuit comprises the 3rd resistance and the 4th resistance, and described latching circuit comprises the first triode and the second triode; The negative electrode of the first diode in the negative electrode of described the first voltage stabilizing didoe and the described voltage detecting circuit is connected, one end of described the 3rd resistance and the anodic bonding of described the first voltage stabilizing didoe, the other end of described the 3rd resistance is respectively through described the 4th resistance and described the second capacity earth, the collector electrode of the base stage of described the first triode and described the second triode all is connected between described the 3rd resistance and described the 4th resistance, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the base stage of described the second triode, and is connected with the emitter utmost point of described the second triode and the input of described PFC chip power control circuit through described the 5th resistance and described the 3rd electric capacity respectively.
Preferably, the first triode and described the 3rd triode that described control signal produces in the circuit are the NPN triode, and described the second triode is the PNP triode.
Preferably, this PFC overvoltage crowbar also comprises ac power input end, bridge rectifier, dc power output end, output electrochemical capacitor, current-limiting resistance and rectifier diode; Described ac power input end is connected with the different name end of armature winding and the different name end of described auxiliary winding in the described boost inductance respectively through described bridge rectifier, the Same Name of Ends of described armature winding is connected with described dc power output end through described rectifier diode, the Same Name of Ends of described auxiliary winding is connected with the zero passage detection pin of described PFC chip through described current-limiting resistance, the positive pole of described output electrochemical capacitor is connected with described dc power output end, the minus earth of described output electrochemical capacitor.
Preferably, described output electrochemical capacitor comprises the second electrochemical capacitor and the 3rd electrochemical capacitor; The positive pole of described the second electrochemical capacitor is connected with the positive pole of described the 3rd electrochemical capacitor, and is connected with described dc power output end, and the negative pole of described the second electrochemical capacitor is connected with the negative pole of described the 3rd electrochemical capacitor, and ground connection.
Preferably, the model of described PFC chip is FAN7930C.
The utility model also proposes a kind of Switching Power Supply, and described Switching Power Supply comprises the PFC overvoltage crowbar, and described PFC overvoltage crowbar comprises boost inductance and PFC chip, and described boost inductance comprises armature winding and auxiliary winding; Also comprise: for detection of the voltage detecting circuit of the voltage of described auxiliary winding, be used for according to the detected voltage of described voltage detecting circuit, the control signal of output corresponding control signal produces circuit and is used for producing the control signal that circuit produces according to described control signal, cut off or open the PFC chip power control circuit of the working power of described PFC chip, wherein:
The Same Name of Ends of the auxiliary winding in the detection input of described voltage detecting circuit and the described boost inductance is connected, the detection output of described voltage detecting circuit is connected with the input that described control signal produces circuit, the output that described control signal produces circuit is connected with the input of described PFC chip power control circuit, and the output of described PFC chip power control circuit is connected with the power supply input pin of described PFC chip.
The PFC overvoltage crowbar that the utility model proposes; detect the voltage of auxiliary winding in the boost inductance by voltage detecting circuit; and Voltage-output to the control signal that detects produced circuit; control signal produces the voltage that circuit detects according to voltage detecting circuit; export corresponding control signal to PFC chip power control circuit; PFC chip power control circuit is according to the control signal that receives; cut off or open the working power of PFC chip; with the work of control PFC chip, thus the purpose of output electrochemical capacitor in the realization protective circuit.The utility model PFC overvoltage crowbar has improved the reliability and stability of circuit over-voltage protecting function with respect to PFC overvoltage crowbar of the prior art, has reduced the power consumption of circuit; Simultaneously, because utility model is to adopt the simple components and parts of resistance, electric capacity and triode etc. with low cost to realize the over-voltage protecting function of circuit, therefore, cost of the present utility model is lower.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model PFC overvoltage crowbar preferred embodiment.
The realization of the utility model purpose, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Further specify the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 is the electrical block diagram of the utility model PFC overvoltage crowbar preferred embodiment.
With reference to Fig. 1, the utility model PFC overvoltage crowbar comprises that ac power input end 1, bridge rectifier 2, boost inductance 3, rectifier diode D3, current-limiting resistance R6, PFC chip 4, output electrochemical capacitor 5, dc power output end 6, voltage detecting circuit 7, control signal produce circuit 8, PFC chip power control circuit 9.Wherein, boost inductance 3 comprises armature winding L1 and auxiliary winding L 2.The model of the PFC chip 4 among the utility model embodiment is FAN7930C.
Particularly, ac power input end 1 is connected with the input of bridge rectifier 2, bridge rectifier 2 cathode output ends are connected with the different name end of armature winding L1 in the boost inductance 3, bridge rectifier 2 cathode output ends are connected with the different name end of auxiliary winding L 2 in the boost inductance 3, the anodic bonding of the Same Name of Ends of armature winding L1 and rectifier diode D3 in the boost inductance 3, the negative electrode of rectifier diode D3 is connected with dc power output end 6, the Same Name of Ends of auxiliary winding L 2 is connected with the zero passage detection pin ZCD of PFC chip 4 through current-limiting resistance R6 in the boost inductance 3, the positive pole of output electrochemical capacitor 5 is connected with dc power output end 6, the minus earth of output electrochemical capacitor 5;
The detection input of voltage detecting circuit 7 is connected with the Same Name of Ends of auxiliary winding L 2 in the boost inductance 3, the detection output of voltage detecting circuit 7 is connected with the input that control signal produces circuit 8, the output that control signal produces circuit 8 is connected with the input of PFC chip power control circuit 9, and the output of PFC chip power control circuit 9 is connected with the power supply input pin VCC of PFC chip 4.
Wherein, above-mentioned voltage detecting circuit 7 is for detection of the voltage of auxiliary winding L 2 in the boost inductance 3; Control signal produces circuit 8 and is used for according to voltage detecting circuit 7 detected voltages, and the output corresponding control signal is to PFC chip power control circuit 9; PFC chip power control circuit 9 is used for producing the control signal that circuit 8 produces according to control signal, cuts off or open the working power of PFC chip 4, with the work of control PFC chip 4.
Particularly, voltage detecting circuit 7 comprises the first resistance R 1, the second resistance R 2, the first capacitor C 1, double diode 71 and the first polar capacitor E1.Wherein, double diode 71 comprises the first diode D1 and the second diode D2.One end of the first resistance R 1 is the detection input of voltage detecting circuit 7, be connected with the Same Name of Ends of auxiliary winding L 2 in the boost inductance 3, the other end of the first resistance R 1 is connected between the negative electrode of the anode of the first diode D1 in the double diode 71 and the second diode D2 through the first capacitor C 1, the negative electrode of the first diode D1 is connected with the positive pole of the first polar capacitor E1, and through the second resistance R 2 ground connection, the equal ground connection of anode of the negative pole of the first polar capacitor E1 and the second diode D2.The negative electrode of above-mentioned the first diode D1 is the detection output of voltage detecting circuit 7, and the input that produces circuit 8 with control signal is connected;
Control signal produces circuit 8 and comprises the first voltage stabilizing didoe ZD1, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the second capacitor C 2, the 3rd capacitor C 3, the first triode Q1 and the second triode Q2.Wherein, the first voltage stabilizing didoe ZD1 consists of voltage stabilizing circuit, and the 3rd resistance R 3 and the 4th resistance R 4 consist of bleeder circuit, and the first triode Q1 and the second triode Q2 consist of latching circuit.Particularly, the negative electrode of the first voltage stabilizing didoe is the input that control signal produces circuit 8, be connected (namely the negative electrode with above-mentioned the first diode D1 is connected) with the detection output of voltage detecting circuit 7, one end of the 3rd resistance R 3 is the input of bleeder circuit, this end of the 3rd resistance R 3 and the anodic bonding of the first voltage stabilizing didoe ZD1, the other end of the 3rd resistance R 3 is respectively through the 4th resistance R 4 and the second capacitor C 2 ground connection, node between the 3rd resistance R 3 and the 4th resistance R 4 is the output of bleeder circuit, be connected with the collector electrode of the base stage of the first triode Q1 and the second triode Q2 (wherein the base stage of the first triode Q1 be latching circuit input), the grounded emitter of the first triode Q1, the collector electrode of the first triode Q1 is connected with the base stage of the second triode Q2, and is connected with the emitter utmost point of the second triode Q2 and the input of PFC chip power control circuit 9 through the 5th resistance R 5 and the 3rd capacitor C 3 respectively.Wherein, the emission of the second triode Q2 is the output of latching circuit very, also is the output that control signal produces circuit 8;
PFC chip power control circuit 9 comprises PFC chip operation power input 91, the second voltage stabilizing didoe ZD2 and the 3rd triode Q3.Wherein, the base stage of the 3rd triode Q3 is the input of PFC chip power control circuit 9, the output that produces circuit 8 with control signal is connected (namely the emitter with above-mentioned the second triode Q2 is connected), and be connected with the negative electrode of the second voltage stabilizing didoe ZD2, the plus earth of the second voltage stabilizing didoe ZD2, the collector electrode of the 3rd triode Q3 is connected with PFC chip operation power input 91, the emission of the 3rd triode Q3 is the output of PFC chip power control circuit 9 very, is connected with the power supply input pin VCC of PFC chip 4.
And PFC chip power control circuit 9 also comprises the 4th capacitor C 4, the 6th resistance R 6, the 7th resistance R 7 and power supply VCC1.Wherein, an end of the 6th resistance R 6 is connected with the negative electrode of the second voltage stabilizing didoe ZD2, and through the 4th capacitor C 4 ground connection, the other end of the 6th resistance R 6 is connected with power supply VCC1, and through the 7th resistance R 7 ground connection.
Among the utility model embodiment, the first triode Q1 that control signal produces in the circuit 8 is the NPN triode, and the second triode Q2 is the PNP triode.The 3rd triode Q3 in the PFC chip power control circuit 9 is the NPN triode.Output electrochemical capacitor 5 comprises the second electrochemical capacitor E2 and the 3rd electrochemical capacitor E3, the positive pole of the second electrochemical capacitor E2 is connected with the positive pole of the 3rd electrochemical capacitor D3, and be connected with dc power output end 6, the negative pole of the second electrochemical capacitor E2 is connected with the negative pole of the 3rd electrochemical capacitor E3, and ground connection.
The operation principle of the utility model PFC overvoltage crowbar specifically describes as follows: voltage detecting circuit 7 has been realized the voltage (namely exporting the voltage of electrochemical capacitor 5) of indirect detection dc power output end 6 by the detection to the voltage of auxiliary winding L 2 in the boost inductance 3.Because the voltage of the first triode Q1 base stage is to obtain by the 3rd resistance R 3 and the 4th resistance R 4 dividing potential drops, therefore, the voltage of the first triode Q1 base stage is to change along with the variation of the voltage at the first electrochemical capacitor E1 two ends, and the voltage at the first electrochemical capacitor E1 two ends can change along with the variation of the voltage VPL of auxiliary winding L 2 in the boost inductance 3, and the voltage VPL of auxiliary winding L 2 can change along with the variation of the voltage of dc power output end 6 in the boost inductance 3.Therefore; when the voltage of dc power output end 6 raises; the voltage VPL of auxiliary winding L 2 will raise in the boost inductance 3; thereby so that the voltage at the first electrochemical capacitor E1 two ends raises; when the voltage at the first electrochemical capacitor E1 two ends is increased to voltage stabilizing value greater than the first voltage stabilizing didoe ZD1; the first voltage stabilizing didoe ZD1 is with conducting; the base stage of the first triode Q1 will obtain corresponding dividing potential drop this moment; and the voltage at the first electrochemical capacitor E1 two ends is higher; then the voltage of the first triode Q1 base stage is just higher; when the voltage of the first triode Q1 base stage is higher than its conducting voltage (0.6 ~ 0.7V) time; the first triode Q1 is with conducting; and within the extremely short time; the second triode Q2 conducting (namely having realized auto-lock function); and; the first triode Q1 and the second triode Q2 enter saturation condition; the voltage VPRO of the second triode Q2 emitter is dragged down; thereby so that the cut-off of the 3rd triode Q3 in the PFC chip power control circuit 9; thereby cut off the power supply of 91 pairs of PFC chips 4 of PFC chip operation power input; so that PFC chip 4 quits work, thereby protected the output electrochemical capacitor 5 that is connected in dc power output end 6 not puncture because of overvoltage; burn.
When the utility model embodiment is in normal operating conditions, be that the voltage of dc power output end 6 is when being in the normal voltage range, when namely the voltage VPL at auxiliary winding L 2 places is in the normal voltage range in the boost inductance 3, the first triode Q1 and the second triode Q2 that control signal produces in the circuit 8 are cut-off state, thereby so that the voltage VPRO of the emitter of the second triode Q2 is high level, namely the base stage of the 3rd triode Q3 in the PFC chip power control circuit 9 this moment is high level, thereby so that the 3rd triode Q3 is conducting state, PFC chip operation power input 91 provides working power for the power supply input pin VCC of PFC chip 4, and PFC chip 4 is in normal operation.Only has the circuit abnormal of working as; when causing in the boost inductance 3 the voltage VPL of auxiliary winding L 2 too high; the utility model PFC overvoltage crowbar just can move; to cut off the power supply of 91 pairs of PFC chips 4 of PFC chip operation power input; PFC chip 4 is quit work, thereby realize that the utility model PFC overvoltage crowbar is to the defencive function of output electrochemical capacitor 5.
In addition; the utility model embodiment is on the type selecting of components and parts; the second resistance R 2 should be selected the larger resistance of resistance; the 3rd resistance R 3 and the 4th resistance R 4 should be selected precision resister; to guarantee that error protection action does not appear in the utility model PFC overvoltage crowbar; and the 4th resistance R 4 can not be chosen the too small resistance of resistance, to improve the job stability of the utility model PFC overvoltage crowbar.
The PFC overvoltage crowbar that the utility model proposes; detect the voltage of auxiliary winding in the boost inductance by voltage detecting circuit; and Voltage-output to the control signal that detects produced circuit; control signal produces the voltage that circuit detects according to voltage detecting circuit; export corresponding control signal to PFC chip power control circuit; PFC chip power control circuit cuts off or opens the working power of PFC chip according to the control signal that receives, with the work of control PFC chip.When voltage detecting circuit detects the overtension of auxiliary winding in the boost inductance; when namely being higher than the predeterminated voltage value; control signal produces circuit will produce a control signal to PFC chip power control circuit; make PFC chip power control circuit cut off the working power of PFC chip; the PFC chip is quit work, thus the output electrochemical capacitor in the protective circuit.The utility model PFC overvoltage crowbar has improved the reliability and stability of circuit over-voltage protecting function with respect to PFC overvoltage crowbar of the prior art, has reduced the power consumption of circuit; And because utility model is to adopt the simple components and parts of resistance, electric capacity and triode etc. with low cost to realize the over-voltage protecting function of circuit, therefore, cost of the present utility model is lower; Simultaneously, portability of the present utility model is better.
The utility model also proposes a kind of Switching Power Supply, and this Switching Power Supply comprises the PFC overvoltage crowbar, and the circuit structure of its PFC overvoltage crowbar is identical with the circuit structure of the described PFC overvoltage crowbar of top embodiment, repeats no more herein.
The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. a PFC overvoltage crowbar comprises boost inductance and PFC chip, and described boost inductance comprises armature winding and auxiliary winding; It is characterized in that, also comprise:
For detection of the voltage detecting circuit of the voltage of described auxiliary winding, be used for according to the detected voltage of described voltage detecting circuit, the control signal of output corresponding control signal produces circuit and is used for producing the control signal that circuit produces according to described control signal, cut off or open the PFC chip power control circuit of the working power of described PFC chip, wherein:
The Same Name of Ends of the auxiliary winding in the detection input of described voltage detecting circuit and the described boost inductance is connected, the detection output of described voltage detecting circuit is connected with the input that described control signal produces circuit, the output that described control signal produces circuit is connected with the input of described PFC chip power control circuit, and the output of described PFC chip power control circuit is connected with the power supply input pin of described PFC chip.
2. PFC overvoltage crowbar according to claim 1 is characterized in that, described voltage detecting circuit comprises the first resistance, the second resistance, the first electric capacity, double diode and the first polar capacitor; Described double diode comprises the first diode and the second diode, the Same Name of Ends of the auxiliary winding in one end of described the first resistance and the described boost inductance is connected, the other end of described the first resistance is connected between the negative electrode of the anode of the first diode in the described double diode and the second diode through described the first electric capacity, the negative electrode of described the first diode is connected with the positive pole of described the first polar capacitor, and through described the second grounding through resistance, the equal ground connection of anode of the negative pole of described the first polar capacitor and described the second diode.
3. PFC overvoltage crowbar according to claim 2 is characterized in that, described control signal produces circuit and comprises voltage stabilizing circuit, bleeder circuit, latching circuit, the 5th resistance, the second electric capacity and the 3rd electric capacity; The negative electrode of the first diode in one end of described voltage stabilizing circuit and the described voltage detecting circuit is connected, the other end of described voltage stabilizing circuit is connected with the input of described bleeder circuit, the output of described bleeder circuit is connected with the input of described latching circuit, and through described the second capacity earth, the output of described latching circuit is the output that described control signal produces circuit, be connected with the input of described PFC chip power control circuit, one end of described the 5th resistance is connected with an end of described the 3rd electric capacity, and be connected with described latching circuit, the other end of described the 5th resistance is connected with the other end of described the 3rd electric capacity, and is connected with the input of described PFC chip power control circuit.
4. PFC overvoltage crowbar according to claim 3 is characterized in that, described PFC chip power control circuit comprises PFC chip operation power input, the second voltage stabilizing didoe and the 3rd triode; The base stage of described the 3rd triode is the input of described PFC chip power control circuit, the output that produces circuit with described control signal is connected, and be connected with the negative electrode of described the second voltage stabilizing didoe, the plus earth of described the second voltage stabilizing didoe, the collector electrode of described the 3rd triode is connected with described PFC chip operation power input, and the emitter of described the 3rd triode is connected with the power supply input pin of described PFC chip.
5. PFC overvoltage crowbar according to claim 4 is characterized in that, described voltage stabilizing circuit comprises the first voltage stabilizing didoe, and described bleeder circuit comprises the 3rd resistance and the 4th resistance, and described latching circuit comprises the first triode and the second triode; The negative electrode of the first diode in the negative electrode of described the first voltage stabilizing didoe and the described voltage detecting circuit is connected, one end of described the 3rd resistance and the anodic bonding of described the first voltage stabilizing didoe, the other end of described the 3rd resistance is respectively through described the 4th resistance and described the second capacity earth, the collector electrode of the base stage of described the first triode and described the second triode all is connected between described the 3rd resistance and described the 4th resistance, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the base stage of described the second triode, and is connected with the emitter utmost point of described the second triode and the input of described PFC chip power control circuit through described the 5th resistance and described the 3rd electric capacity respectively.
6. PFC overvoltage crowbar according to claim 5 is characterized in that, the first triode and described the 3rd triode that described control signal produces in the circuit are the NPN triode, and described the second triode is the PNP triode.
7. PFC overvoltage crowbar according to claim 1 is characterized in that, this PFC overvoltage crowbar also comprises ac power input end, bridge rectifier, dc power output end, output electrochemical capacitor, current-limiting resistance and rectifier diode; Described ac power input end is connected with the different name end of armature winding and the different name end of described auxiliary winding in the described boost inductance respectively through described bridge rectifier, the Same Name of Ends of described armature winding is connected with described dc power output end through described rectifier diode, the Same Name of Ends of described auxiliary winding is connected with the zero passage detection pin of described PFC chip through described current-limiting resistance, the positive pole of described output electrochemical capacitor is connected with described dc power output end, the minus earth of described output electrochemical capacitor.
8. PFC overvoltage crowbar according to claim 7 is characterized in that, described output electrochemical capacitor comprises the second electrochemical capacitor and the 3rd electrochemical capacitor; The positive pole of described the second electrochemical capacitor is connected with the positive pole of described the 3rd electrochemical capacitor, and is connected with described dc power output end, and the negative pole of described the second electrochemical capacitor is connected with the negative pole of described the 3rd electrochemical capacitor, and ground connection.
9. PFC overvoltage crowbar according to claim 1 is characterized in that, the model of described PFC chip is FAN7930C.
10. a Switching Power Supply is characterized in that, comprises each described PFC overvoltage crowbar among the claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220267211 CN202696121U (en) | 2012-06-07 | 2012-06-07 | Power factor correction (PFC) overvoltage protection circuit and switch power supply |
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| CN 201220267211 CN202696121U (en) | 2012-06-07 | 2012-06-07 | Power factor correction (PFC) overvoltage protection circuit and switch power supply |
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| CN111404112A (en) * | 2020-03-17 | 2020-07-10 | 海信（山东）空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
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2012
- 2012-06-07 CN CN 201220267211 patent/CN202696121U/en not_active Expired - Lifetime
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| CN110212748A (en) * | 2019-06-06 | 2019-09-06 | 宁波三星医疗电气股份有限公司 | A kind of Width funtion power supply input circuit |
| CN111404112A (en) * | 2020-03-17 | 2020-07-10 | 海信（山东）空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
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