CN104467388A - Conductive harmonic suppression power supply based on PFC - Google Patents
Conductive harmonic suppression power supply based on PFC Download PDFInfo
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- CN104467388A CN104467388A CN201410735061.2A CN201410735061A CN104467388A CN 104467388 A CN104467388 A CN 104467388A CN 201410735061 A CN201410735061 A CN 201410735061A CN 104467388 A CN104467388 A CN 104467388A
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/4208—Arrangements for improving power factor of AC input
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Abstract
The invention provides a conductive harmonic suppression power supply based on PFC. The power supply comprises a rectifier bridge, a controller, a Boost circuit, a filter circuit, an auxiliary power supply, a current-limiting circuit, a filter power accumulator, a first voltage detection circuit, a current detection circuit and a second voltage detection circuit. One end of the rectifier bridge is electrically connected with an alternating-current power supply, the other end of the rectifier bridge is sequentially and electrically connected with the Boost circuit, the filter circuit, the current-limiting circuit and the filter power accumulator, the controller is electrically connected with the auxiliary power supply, the first voltage detection circuit, a current detection circuit and one end of the second voltage detection circuit, the other end of the auxiliary power supply is electrically connected between the filter circuit and the current limiting circuit and is powered up from the intermediate-stage VR end of the power supply, the other end of the first voltage detection circuit is electrically connected with the rectifier bridge and the Boost circuit, and the other end of the current detection circuit is electrically connected with the Boost circuit.
Description
Technical field
The present invention relates to the power technique fields of harmonics restraint, particularly a kind of power supply of the conduction type harmonics restraint based on PFC.
Background technology
Along with the development of power electronic technology, increasing power electronic equipment access operation of power networks.The input side of these equipment mostly adopts bridge rectifier filter circuit, and the only just conducting when input voltage is greater than VD of its diode, the time is very short.Therefore, input current is peaked wave, causes AC input current Severe distortion, produces a large amount of harmonic injection electrical networks thus.Mains by harmonics electric current not only cause transformer and supply line overheated, affect the performance of electrical equipment, and produce electromagnetic interference, affect other electronic equipments and normally run.
At present, the main method of harmonic inhabitation has passive filtering and active correction two kinds.Passive filtering seals in LC filter exactly in main circuit, and its filter effect and electric network impedance, frequency are relevant, and bad dynamic performance, also exists and produce parallel resonance, the shortcomings such as filter volume is large with electrical network.Active correction is between rectifier bridge and filter capacitor, add one-level power factor correction link, makes input current waveform follow the tracks of input voltage waveform, reduces the harmonic content of input current while improving electrical source power factor.
For meeting the index of correlation of the military electromagnetic compatibility standard of national military standard GJB151, current harmonic suppression technique by taking to reduce the energy storage inductor amount in Boost circuit in active power factor corrector (PFC), increase its switch operating frequency, reduce the measures such as the front end direct current filtering capacitance of pfc circuit, the Zero-crossing Distortion of input current and most advanced and sophisticated distortion can be reduced, but also can increase inrush current simultaneously, reduce stability of power supply and reliability.
Summary of the invention
For the method inrush current solving the harmonic inhabitation of prior art is large, the stability of power supply and the problem of poor reliability, be necessary the power supply providing a kind of conduction type harmonics restraint based on PFC.
Based on a power supply for the conduction type harmonics restraint of PFC, it comprises rectifier bridge, controller, Boost circuit, filter circuit, accessory power supply, current-limiting circuit, filtering energy storage, the first voltage detecting circuit, current detection circuit, the second voltage detecting circuit;
Rectifier bridge one end is electrically connected with AC power, and its other end is electrically connected with Boost circuit, filter circuit, current-limiting circuit, filtering energy storage successively;
Controller is electrically connected with one end of accessory power supply, the first voltage detecting circuit, current detection circuit, the second voltage detecting circuit respectively; The accessory power supply other end is connected electrically between filter circuit and current-limiting circuit, holds power taking from power supply intergrade VR; The other end of the first voltage detecting circuit is connected electrically between rectifier bridge and Boost circuit; The other end of current detection circuit is electrically connected with Boost circuit;
Rectifier bridge is used for transferring the alternating current of input to unidirectional direct current by being used for, and direct current is exported to Boost circuit;
Boost circuit for raise rectifier bridge export conversion after direct current;
Direct current after filtering for filtering the ripple in rectifier bridge output DC voltage, and is exported to current-limiting circuit by filter circuit;
Accessory power supply is used for holding power taking from power supply intergrade VR, and for controller provides primary power, power supply intergrade VR holds between filter circuit and current-limiting circuit;
Current-limiting circuit is for suppressing the inrush current in accessory power supply;
Filtering energy storage, for storing the electric charge after current-limiting circuit current limliting, is powered to external loading;
The DC voltage value that first voltage detecting circuit is used for rectifier bridge exports converts the first voltage to and exports to controller;
The DC current flow value that current detection circuit is used for rectifier bridge exports converts the second voltage to and exports to controller;
The DC voltage that second voltage detecting circuit is used for filtering energy storage exports converts tertiary voltage amount to and exports to controller;
Controller for receiving the first voltage, the second voltage, tertiary voltage amount, and adjusts according to the first voltage, the second voltage, the power of tertiary voltage amount to the conduction type harmonics restraint based on PFC.
The power supply of the conduction type harmonics restraint based on PFC provided by the invention, by adopting controller and converting input AC electricity to direct current in conjunction with Boost circuit, make input current waveform follow the tracks of input voltage waveform, and reduce the harmonic content in input current with this.Input AC electricity, after rectifier bridge, enters the power factor corrector of controller and Boost circuit composition, AC conversion is become direct current.First the auxiliary electrical of controller holds power taking from the pre-steady level VR of power supply, utilizes ancillary coil and high-frequency rectification circuit power taking after device to be controlled normally works from the inductance of Boost circuit.Pre-steady level VR end enters powering load after filter bank energy after current-limiting circuit.
Meanwhile, adopt and be input in controller after converting input voltage, input current and output voltage to voltage by the first voltage detecting circuit, current detection circuit, the second voltage detecting circuit.
The advantage of a kind of conduction type harmonics restraint power supply based on PFC of the present invention is:
1) improve electrical source power factor, reduce the harmonic content of mains input current simultaneously.
2) by current-limiting circuit, restrained effectively inrush current, improve the reliability of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the power supply of the conduction type harmonics restraint based on PFC that embodiment of the present invention provides;
Fig. 2 is the circuit diagram of current-limiting circuit in Fig. 1;
Fig. 3 is the circuit diagram of flow equalizing circuit in Fig. 1;
Fig. 4 a, Fig. 4 b, Fig. 4 c are the circuit diagrams of overvoltage crowbar in Fig. 1.
In accompanying drawing: 1-rectifier bridge, 2-controller, 3-Boost booster circuit, 4-filter circuit, 5-accessory power supply, 6-current-limiting circuit, 7-filtering energy storage, 8-first voltage detecting circuit, 9-current detection circuit, 10-second voltage detecting circuit, 11-overvoltage crowbar, 12-flow equalizing circuit, 13-power sense circuit, 14-overheating protection circuit.
Embodiment
As shown in Figure 1, the embodiment of the present invention provides a kind of power supply of the conduction type harmonics restraint based on PFC, and it comprises rectifier bridge 1, controller 2, Boost circuit 3, filter circuit 4, accessory power supply 5, current-limiting circuit 6, filtering energy storage 7, first voltage detecting circuit 8, current detection circuit 9, second voltage detecting circuit 10.
Rectifier bridge 1 one end is electrically connected with AC power, and its other end is electrically connected with Boost circuit 2, filter circuit 4, current-limiting circuit 6, filtering energy storage 7 successively.
Controller 2 is electrically connected with one end of accessory power supply 5, first voltage detecting circuit 8, current detection circuit 9, second voltage detecting circuit 10 respectively; Accessory power supply 5 other end is connected electrically between filter circuit 4 and current-limiting circuit 6, holds power taking from power supply intergrade VR; The other end of the first voltage detecting circuit 8 is connected electrically between rectifier bridge 1 and Boost circuit 3; The other end of current detection circuit 9 is electrically connected with Boost circuit 3.
Direct current for transferring the alternating current of input to unidirectional direct current by being used for, and is exported to Boost circuit 3 by rectifier bridge 1.
Boost circuit 3 for raise rectifier bridge 1 export conversion after direct current.
Filter circuit 4 exports ripple in DC voltage for filtering rectifier bridge 1, and the direct current after filtering is exported to current-limiting circuit 6.
Accessory power supply 5 is for holding power taking from power supply intergrade VR, and for controller 2 provides primary power, power supply intergrade VR holds between filter circuit 4 and current-limiting circuit 6.
Current-limiting circuit 6 is for suppressing the inrush current in accessory power supply 5.
Filtering energy storage 7, for storing the electric charge after current-limiting circuit 6 current limliting, is powered to external loading.
First voltage detecting circuit 8 converts the first voltage to for the DC voltage value exported by rectifier bridge 1 and exports to controller 2.
Current detection circuit 9 converts the second voltage to for the DC current flow value exported by rectifier bridge 1 and exports to controller 2.
Second voltage detecting circuit 10 converts tertiary voltage amount to for DC voltage filtering energy storage 7 exported and exports to controller 2.
Controller 2 for receiving the first voltage, the second voltage, tertiary voltage amount, and adjusts according to the first voltage, the second voltage, the power of tertiary voltage amount to the conduction type harmonics restraint based on PFC.
The power supply of the conduction type harmonics restraint based on PFC that the embodiment of the present invention provides, by adopting controller 2 and converting input AC electricity to direct current in conjunction with Boost circuit 3, make input current waveform follow the tracks of input voltage waveform, and reduce the harmonic content in input current with this.Input AC electricity, after rectifier bridge 1, enters the power factor corrector of controller 2 and Boost circuit 3 composition, AC conversion is become direct current.First the auxiliary electrical of controller 2 holds power taking from the pre-steady level VR of power supply, and device 2 to be controlled utilizes ancillary coil and high-frequency rectification circuit power taking from the inductance of Boost circuit 3 after normally working.Pre-steady level VR end enters filter bank after current-limiting circuit 6 can powering load after 7.
Meanwhile, adopt and be input in controller 2 after converting input voltage, input current and output voltage to voltage by the first voltage detecting circuit 8, current detection circuit 9, second voltage detecting circuit 10.
The advantage of a kind of conduction type harmonics restraint power supply based on PFC of the present invention is:
1) improve electrical source power factor, reduce the harmonic content of mains input current simultaneously.
2) by current-limiting circuit, restrained effectively inrush current, improve the reliability of Switching Power Supply.
Alternatively, controller 2 can be UC3854 control chip.
Alternatively, Boost circuit 3 can be booster type (Boost) power factor corrector (PFC) circuit.
Alternatively, in the power supply of the conduction type harmonics restraint based on PFC of the present invention, it also comprises flow equalizing circuit 12, power sense circuit 13 and overheating protection circuit 14;
One end of flow equalizing circuit 12, power sense circuit 13 and overheating protection circuit 14 is all electrically connected with controller;
Flow equalizing circuit 12 other end is electrically connected with exterior PC; Power sense circuit 13 other end is electrically connected with verification enable port PENA.
In the present embodiment, flow equalizing circuit 12 can be band parallel connected end automatic load flow equalizing circuit, and it can be applied to the parallel connection of DC power supply, to realize powerful power-supply system.
Alternatively, as shown in Figure 2, in the power supply of the conduction type harmonics restraint based on PFC of the present invention, current-limiting circuit 6 comprises photoelectric isolating coupler U1 (U1 can be photoelectric isolating coupler TLP191), NPN triode Q1 (Q1 can be triode S9013), N raceway groove MosFET pipe M1, controllable silicon Q2, voltage-stabiliser tube Z1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5;
One end of resistance R1 connects with accessory power supply anode (positive terminal voltage can be 15V), and its other end connects with first pin of U1; One end of resistance R2 connects with the 9th pin (reference voltage REF) of controller (controller can be UC3854 chip), and the R2 other end connects with the base stage of Q1; The emitter of Q1 connects the power source reference ground based on the conduction type harmonics restraint of PFC, and the collector electrode of Q1 connects with second pin of U1; The gate pole of one end of the 3rd pin of U1 and the positive pole of voltage-stabiliser tube Z1, resistance R3, one end of electric capacity C1, one end of resistance R5, the source electrode of M1 and Q2 connects, and the other end of the 4th pin of U1 and the negative pole of Z1, resistance R3, the other end of electric capacity C1 and the gate pole of M1 connect; The other end of resistance R5 connects with the output end vo ut of the negative electrode of Q2, power supply; The drain electrode of M1 connects with one end of resistance R4, and the other end of R4 connects with the pre-steady step voltage VR of the anode of Q2, power supply.
In the present embodiment, current-limiting circuit 6 can suppress the defect of the inrush current existed in power supply.
Alternatively, as shown in Figure 3, in the power supply of the conduction type harmonics restraint based on PFC in the invention process, flow equalizing circuit 12 comprises second controller U2 (U2 can be LM324), resistance R1a, resistance R2a, resistance R3a, resistance R4a, resistance R5a, resistance R6a, resistance R7a, resistance R8a, electric capacity C1a;
4th pin of U2 connects with accessory power supply anode, and the 11 pin of U2 connects with reference to ground with accessory power supply; One end of resistance R1a connects with the magnitude of voltage Vin that the electric power outputting current sampling resistor of the conduction type harmonics restraint based on PFC collects, and the resistance R1a other end connects with the 13 pin of U2; One end of resistance R2a is connected with the 13 pin of one end of electric capacity C1a, U2, and the resistance R2a other end connects with the other end of electric capacity C1a, the 14 pin of U2; 12 pin of U2 connects with reference to ground with accessory power supply; 14 pin of U2 connects with the 3rd pin of U2; Second pin of U2 connects with one end of first pin of U2, resistance R3a, one end of resistance R4a; The other end of resistance R3a is with one end of resistance R5a, connect based on the power sources in parallel signal Vp of the conduction type harmonics restraint of PFC; The other end of resistance R5a connects with one end of the 6th pin of U2, resistance R6a; The other end of resistance R6a connects with one end of the 7th pin of U2, resistance R8a; The other end of resistance R4a connects with one end of the 5th pin of U2, resistance R7a; The other end of resistance R7a connects with the 8th pin of the 9th pin of U2, U2; The other end of resistance R8a connects with the tenth pin of U2, controller (can be UC3854) the 11 pin (voltage feedback signal Vsense).
In the present embodiment, flow equalizing circuit 12 can be band parallel connected end automatic load flow equalizing circuit, can be applicable to the parallel connection of DC power supply, to realize powerful power-supply system.
Alternatively, in the power supply of the conduction type harmonics restraint based on PFC of the present invention, it also comprises overvoltage crowbar 11; Overvoltage crowbar 11 one end is electrically connected with controller 2, and its other end is electrically connected with the output of filtering energy storage 7.
Alternatively, in the power supply of the conduction type harmonics restraint based on PFC of the present invention, overvoltage crowbar 11 is secondary output overvoltage protection circuit.
In the present embodiment, overvoltage crowbar 11 can improve reliability and the precision of voltage regulation of the power supply of the conduction type harmonics restraint based on PFC.
Alternatively, as shown in Fig. 4 a, 4b, 4c, in the power supply of the conduction type harmonics restraint based on PFC of the present invention, secondary output overvoltage protection circuit comprises resistance R1b, resistance R2b, resistance R3b, resistance R4b, resistance R5b, resistance R6b, resistance R7b, resistance R8b, resistance R9b, resistance R10b, resistance R11b, the 3rd controller U3, triode Q1b, triode Q2b, diode D1b, diode D2b, diode D3b, voltage-stabiliser tube Z1b, electric capacity C1b;
Fig. 4 a carries out the sampling of two-stage dividing potential drop to output voltage; sampled signal is Vref2 and Vref3 respectively; Fig. 4 b adopts hysteresis comparator to be compared by the reference voltage signal Vref1 of voltage signal Vref3 large for sampled value in Fig. 4 a and setting to implement recoverable protection to power supply afterwards, and to be employing positive feedback comparator by the reference voltage Vref 1 of voltage signal Vref2 little for sampled value in Fig. 4 a and setting compare Fig. 4 c implements expendable protection to power supply afterwards.
3rd pin of U3 (U3 is voltage comparator Lm339) connects with accessory power supply anode, and the 12 pin of U3 connects with power source reference ground;
One end of power output end Vout and R1b connects, the other end of R1b and one end of R2b and the large voltage signal Vref3 of sampled value connect, the other end of R2b and one end of R3b and the little voltage signal Vref2 of sampled value connect, and the other end of resistance R3b connects with power source reference ground.
Vref3 connects with one end of resistance R4b, and the other end of R4b connects with the 5th pin of one end of R5b and U3; The other end of R5b connects with second pin of U3, one end of R6b and one end of R7b; 4th pin of U3 connects with the reference voltage Vref 1 of setting; The other end of R7b connects with the base stage of Q1b, and the emitter of Q1b connects with power source reference ground, and the collector electrode of Q1b connects with the tenth pin (the enable signal ENA of control chip UC3854) of controller.
7th pin of Vref2 and U3 connects, Vref1 connects with one end of resistance R8b, the other end of R8b connects with the 6th pin of the anode of D1b and U3, the negative electrode of D1b connects with the 16 pin of the collector electrode of Q2b, controller and one end of R10b, the other end of R10b connects with the negative electrode of D2b, and the anode of D2b connects with the tenth pin (the enable signal ENA of control chip UC3854) of controller; The base stage of Q2b connects with the anode of one end of R11b and Z1b, the emitter of Q2b connects with the other end of R11b and power source reference ground, the negative electrode of Z1b connects with the negative electrode of one end of C1b and D3b, the other end of C1b connects with power source reference ground, the anode of D3b connects with first pin of one end of R9b and U3, and the other end of R9b connects with accessory power supply anode.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in random access memory, internal memory, read-only memory, electrically programmable ROM, electricity can sassafras except any other forms of storage medium known in programming ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Be understandable that, for the person of ordinary skill of the art, other various corresponding change and distortion can be made by technical conceive according to the present invention, and all these change the protection range that all should belong to the claims in the present invention with distortion.
Claims (7)
1. based on a power supply for the conduction type harmonics restraint of PFC, it is characterized in that: it comprises rectifier bridge, controller, Boost circuit, filter circuit, accessory power supply, current-limiting circuit, filtering energy storage, the first voltage detecting circuit, current detection circuit, the second voltage detecting circuit;
Rectifier bridge one end is electrically connected with AC power, and its other end is electrically connected with Boost circuit, filter circuit, current-limiting circuit, filtering energy storage successively;
Controller is electrically connected with one end of accessory power supply, the first voltage detecting circuit, current detection circuit, the second voltage detecting circuit respectively; The accessory power supply other end is connected electrically between filter circuit and current-limiting circuit, holds power taking from power supply intergrade VR; The other end of the first voltage detecting circuit is connected electrically between rectifier bridge and Boost circuit; The other end of current detection circuit is electrically connected with Boost circuit;
Rectifier bridge is used for transferring the alternating current of input to unidirectional direct current by being used for, and direct current is exported to Boost circuit;
Boost circuit for raise rectifier bridge export conversion after direct current;
Direct current after filtering for filtering the ripple in rectifier bridge output DC voltage, and is exported to current-limiting circuit by filter circuit;
Accessory power supply is used for holding power taking from power supply intergrade VR, and for controller provides primary power, power supply intergrade VR holds between filter circuit and current-limiting circuit;
Current-limiting circuit is for suppressing the inrush current in accessory power supply;
Filtering energy storage, for storing the electric charge after current-limiting circuit current limliting, is powered to external loading;
The DC voltage value that first voltage detecting circuit is used for rectifier bridge exports converts the first voltage to and exports to controller;
The DC current flow value that current detection circuit is used for rectifier bridge exports converts the second voltage to and exports to controller;
The DC voltage that second voltage detecting circuit is used for filtering energy storage exports converts tertiary voltage amount to and exports to controller;
Controller for receiving the first voltage, the second voltage, tertiary voltage amount, and adjusts according to the first voltage, the second voltage, the power of tertiary voltage amount to the conduction type harmonics restraint based on PFC.
2., as claimed in claim 1 based on the power supply of the conduction type harmonics restraint of PFC, it is characterized in that, it also comprises flow equalizing circuit, power sense circuit and overheating protection circuit;
One end of flow equalizing circuit, power sense circuit and overheating protection circuit is all electrically connected with controller;
The flow equalizing circuit other end is electrically connected with exterior PC; The power sense circuit other end is electrically connected with verification enable port PENA.
3. as claimed in claim 1 or 2 based on the power supply of the conduction type harmonics restraint of PFC, it is characterized in that, current-limiting circuit comprises photoelectric isolating coupler U1, NPN triode Q1, N raceway groove MosFET pipe M1, controllable silicon Q2, voltage-stabiliser tube Z1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5;
One end of resistance R1 connects with accessory power supply anode, and its other end connects with first pin of U1; One end of resistance R2 connects with the 9th pin of controller, and the R2 other end connects with the base stage of Q1; The emitter of Q1 connects the power source reference ground based on the conduction type harmonics restraint of PFC, and the collector electrode of Q1 connects with second pin of U1; The gate pole of one end of the 3rd pin of U1 and the positive pole of voltage-stabiliser tube Z1, resistance R3, one end of electric capacity C1, one end of resistance R5, the source electrode of M1 and Q2 connects, and the other end of the 4th pin of U1 and the negative pole of Z1, resistance R3, the other end of electric capacity C1 and the gate pole of M1 connect; The other end of resistance R5 connects with the output end vo ut of the negative electrode of Q2, power supply; The drain electrode of M1 connects with one end of resistance R4, and the other end of R4 connects with the pre-steady step voltage VR of the anode of Q2, power supply.
4. as claimed in claim 1 or 2 based on the power supply of the conduction type harmonics restraint of PFC, it is characterized in that, flow equalizing circuit comprises second controller U2, resistance R1a, resistance R2a, resistance R3a, resistance R4a, resistance R5a, resistance R6a, resistance R7a, resistance R8a, electric capacity C1a;
4th pin of U2 connects with accessory power supply anode, and the 11 pin of U2 connects with reference to ground with accessory power supply; One end of resistance R1a connects with the magnitude of voltage Vin that the electric power outputting current sampling resistor of the conduction type harmonics restraint based on PFC collects, and the resistance R1a other end connects with the 13 pin of U2; One end of resistance R2a is connected with the 13 pin of one end of electric capacity C1a, U2, and the resistance R2a other end connects with the other end of electric capacity C1a, the 14 pin of U2; 12 pin of U2 connects with reference to ground with accessory power supply; 14 pin of U2 connects with the 3rd pin of U2; Second pin of U2 connects with one end of first pin of U2, resistance R3a, one end of resistance R4a; The other end of resistance R3a is with one end of resistance R5a, connect based on the power sources in parallel signal Vp of the conduction type harmonics restraint of PFC; The other end of resistance R5a connects with one end of the 6th pin of U2, resistance R6a; The other end of resistance R6a connects with one end of the 7th pin of U2, resistance R8a; The other end of resistance R4a connects with one end of the 5th pin of U2, resistance R7a; The other end of resistance R7a connects with the 8th pin of the 9th pin of U2, U2; The other end of resistance R8a connects with the tenth pin of U2, controller the 11 pin.
5., as claimed in claim 2 based on the power supply of the conduction type harmonics restraint of PFC, it is characterized in that, it also comprises overvoltage crowbar; Overvoltage crowbar one end is electrically connected with controller, and its other end is electrically connected with the output of filtering energy storage.
6., as claimed in claim 5 based on the power supply of the conduction type harmonics restraint of PFC, it is characterized in that, overvoltage crowbar is secondary output overvoltage protection circuit.
7. as claimed in claim 6 based on the power supply of the conduction type harmonics restraint of PFC, it is characterized in that, secondary output overvoltage protection circuit comprises resistance R1b, resistance R2b, resistance R3b, resistance R4b, resistance R5b, resistance R6b, resistance R7b, resistance R8b, resistance R9b, resistance R10b, resistance R11b, the 3rd controller U3, triode Q1b, triode Q2b, diode D1b, diode D2b, diode D3b, voltage-stabiliser tube Z1b, electric capacity C1b;
3rd pin of U3 connects with accessory power supply anode, and the 12 pin of U3 connects with power source reference ground;
One end of power output end Vout and R1b connects, the other end of R1b and one end of R2b and the large voltage signal Vref3 of sampled value connect, the other end of R2b and one end of R3b and the little voltage signal Vref2 of sampled value connect, and the other end of resistance R3b connects with power source reference ground;
Vref3 connects with one end of resistance R4b, and the other end of R4b connects with the 5th pin of one end of R5b and U3; The other end of R5b connects with second pin of U3, one end of R6b and one end of R7b; 4th pin of U3 connects with the reference voltage Vref 1 of setting; The other end of R7b connects with the base stage of Q1b, and the emitter of Q1b connects with power source reference ground, and the collector electrode of Q1b connects with the tenth pin of controller;
7th pin of Vref2 and U3 connects, Vref1 connects with one end of resistance R8b, the other end of R8b connects with the 6th pin of the anode of D1b and U3, the negative electrode of D1b connects with the 16 pin of the collector electrode of Q2b, controller and one end of R10b, the other end of R10b connects with the negative electrode of D2b, and the anode of D2b connects with the tenth pin of controller; The base stage of Q2b connects with the anode of one end of R11b and Z1b, the emitter of Q2b connects with the other end of R11b and power source reference ground, the negative electrode of Z1b connects with the negative electrode of one end of C1b and D3b, the other end of C1b connects with power source reference ground, the anode of D3b connects with first pin of one end of R9b and U3, and the other end of R9b connects with accessory power supply anode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666979A (en) * | 2018-04-24 | 2018-10-16 | 湖北三江航天万峰科技发展有限公司 | A kind of high-voltage switch power supply real-time guard device |
| CN110504847A (en) * | 2018-05-18 | 2019-11-26 | 龙海特尔福汽车电子研究所有限公司 | A kind of AC-DC converter based on PFC+LLC topology |
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| CN201805362U (en) * | 2010-09-29 | 2011-04-20 | 航天科工惯性技术有限公司 | Step current limiting circuit used for aviation AC/DC conversion |
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Cited By (2)
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| CN108666979A (en) * | 2018-04-24 | 2018-10-16 | 湖北三江航天万峰科技发展有限公司 | A kind of high-voltage switch power supply real-time guard device |
| CN110504847A (en) * | 2018-05-18 | 2019-11-26 | 龙海特尔福汽车电子研究所有限公司 | A kind of AC-DC converter based on PFC+LLC topology |
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|---|---|
| CN104467388B (en) | 2017-03-08 |
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