CN204928602U - Power supply circuit and AC -DC power are swashed to high -power reverse side - Google Patents
Power supply circuit and AC -DC power are swashed to high -power reverse side Download PDFInfo
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- CN204928602U CN204928602U CN201520428594.6U CN201520428594U CN204928602U CN 204928602 U CN204928602 U CN 204928602U CN 201520428594 U CN201520428594 U CN 201520428594U CN 204928602 U CN204928602 U CN 204928602U
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Abstract
The utility model is suitable for a power field provides a power supply circuit and AC -DC power are swashed to high -power reverse side, and this circuit includes: the protected location, the rectifying and wave -filtering unit, the input is connected with the output of protected location, the drive control unit, the input with the output of rectifying and wave -filtering unit is connected, switch translation unit has two switch tubes and two transformers, and the elementary of two transformers is connected in parallel, and switch translation unit's the input and the output of rectifying and wave -filtering unit are connected, and switch translation unit's two control ends are connected with two outputs of drive control unit, and switch translation unit's feedback output is connected with the current detection of drive control unit end, and switch translation unit's isolation output is connected with the loop of drive control unit compensation end. The utility model discloses a two switch tubes of two transformers drive, elementary parallelly connected with two transformers, the secondary branch complete machine that comes to make power greatly increased, the effectual components and parts cost of having practiced thrift.
Description
Technical field
The utility model belongs to field of power supplies, particularly relates to a kind of high-power flyback sourse circuit and AC-DC power supply.
Background technology
In various high-technology field, all be unable to do without at present the application of power supply, wherein Flyback configuration power supply due to have compared with forward structure cost low, debug the advantage such as simple and be widely used in small power electric product-derived.
Now, the power of general Flyback configuration can only do more than 100 watt at most, and power again its performance large is just not so good, and comprising temperature rise, efficiency etc. is all the problem that cannot overcome.
Utility model content
The object of the utility model embodiment is to provide a kind of high-power flyback sourse circuit, is intended to solve existing flyback sourse power low, the problem of poor performance.
The utility model embodiment is achieved in that a kind of high-power flyback sourse circuit, and described circuit comprises:
Realize the protected location of overvoltage/overcurrent protection, rear class short-circuit protection and anti-tampering function, two inputs of described protected location connect alternating currents;
Alternating current is converted to the rectification filtering unit of level and smooth high voltage direct current, two inputs of described rectification filtering unit are connected with two outputs of described protected location;
Generate the driving control unit of the identical drive singal of two-way according to high voltage direct current, the input of described driving control unit is connected with the output of described rectification filtering unit;
Drive two switching tubes according to two-way drive singal simultaneously, realize two-way voltage transitions, and generate detection current feedback to the switch transition unit of described driving control unit, described switch transition unit has two switching tubes and two transformers, the primary parallel of two transformers of described switch transition unit, the input of described switch transition unit is connected with the output of described rectification filtering unit, first of described switch transition unit, second control end respectively with first of described driving control unit, second output correspondence connects, the feedback output end of described switch transition unit is connected with the current detecting end of described driving control unit, the isolation and amplifier end of described switch transition unit is connected with the loop compensation end of described driving control unit, the direct voltage of two output stable outputs of described switch transition unit.
Further, described protected location comprises:
Fuse, thermistor, piezo-resistance, the first excitation coil, the second excitation coil, electric capacity CX1, electric capacity CY1, electric capacity CY2, resistance R1, resistance R2, resistance R3, resistance R4;
One end of described fuse is an input of described protected location, the other end of described fuse is connected with one end of described piezo-resistance and the elementary Same Name of Ends of described first excitation coil simultaneously, one end of described thermistor is another input of described protected location, the other end of described thermistor is connected with the other end of described piezo-resistance and the secondary Same Name of Ends of described first excitation coil simultaneously, the elementary different name end of described first excitation coil is connected with one end of described electric capacity CX1 and one end of resistance R1 simultaneously, the other end of described electric capacity CX1 is connected with the secondary different name end of described first excitation coil, one end of described resistance R1 is also connected with one end of described resistance R3 and the elementary different name end of described second excitation coil simultaneously, the other end of described resistance R1 simultaneously with the other end of described resistance R3, one end of described resistance R2 is connected with one end of described resistance R4, the other end of described resistance R2 is all connected with the other end of described electric capacity CX1 with the other end of described resistance R4, the other end of described resistance R4 is also connected with the secondary different name end of described second excitation coil, the elementary Same Name of Ends of described second excitation coil is that an output of described protected location is by described electric capacity CY1 ground connection, the secondary Same Name of Ends of described second excitation coil is that another output of described protected location is by described electric capacity CY2 ground connection.
Further, described rectification filtering unit comprises:
Electric capacity C1, electric capacity C2, electric capacity C3 and rectifier bridge;
Two inputs of described rectifier bridge are two inputs of described rectification filtering unit, one output of described rectifier bridge is connected with one end of described electric capacity C1, described electric capacity C2, described electric capacity C3 while of being the output of described rectification filtering unit, the other end of described electric capacity C1, described electric capacity C2, described electric capacity C3 and another output of described rectifier bridge ground connection simultaneously.
Further, described driving control unit comprises:
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, electric capacity C4, electric capacity C24, the first active matrix driving module, the second active matrix driving module and driving chip;
One end of described resistance R8 is the input of described driving control unit, the other end of described resistance R8 is connected with one end of described resistance R7 and one end of described resistance R9 simultaneously, the other end of described resistance R7 is connected with the detection pin (CS) of described driving chip by described resistance R6, the current detecting end that the detection pin (CS) of described driving chip is described driving control unit passes through described electric capacity C24 ground connection, the other end of described resistance R9 is connected with the startup pin (HV) of described driving chip, output frequency setting pin (RT) of described driving chip is by described resistance R5 ground connection, the loop compensation end that the loop compensation pin (COMP) of described driving chip is described driving control unit passes through described electric capacity C4 ground connection, the output pin (OUT) of described driving chip is connected with the input of described first active matrix driving module and the input of described second active matrix driving module simultaneously, the output of described first active matrix driving module and the output of described second active matrix driving module are respectively first of described driving control unit, second output.
Further, described first active matrix driving module comprises:
Resistance R10, resistance R11, resistance R21, the first triode, the second triode and diode D1;
One end of described resistance R21 is the input of described first active matrix driving module, the other end of described resistance R21 simultaneously with described first triode, the control end of described second triode connects, the current input terminal of described first triode is connected with system power source voltage by described resistance R10, the current output terminal of described first triode is connected with the current input terminal of described second triode, the current output terminal ground connection of described second triode, the current input terminal of described first triode is also connected with one end of described resistance R11 and the negative electrode of described diode D1 simultaneously, the other end of described resistance R11 is that the output of described first active matrix driving module is connected with the anode of described diode D1,
Described second active matrix driving module comprises:
Resistance R20, resistance R22, resistance R23, the 4th triode, the 5th triode and diode D5;
One end of described resistance R20 is the input of described second active matrix driving module, the other end of described resistance R20 simultaneously with described 4th triode, the control end of described 5th triode connects, the current input terminal of described 4th triode is connected with system power source voltage by described resistance R22, the current output terminal of described 4th triode is connected with the current input terminal of described 5th triode, the current output terminal ground connection of described 5th triode, the current input terminal of described 4th triode is also connected with one end of described resistance R23 and the negative electrode of described diode D5 simultaneously, the other end of described resistance R23 is that the output of described second active matrix driving module is connected with the anode of described diode D5.
Further, described driving chip is PWM process chip.
Further, described switch transition unit comprises:
Resistance R12-resistance R19, resistance R24-resistance R30, resistance R37-resistance R43, electric capacity C5-electric capacity C20, electric capacity C22, electric capacity CY3, diode D2, diode D3, diode D4, diode D7, inductance L 1-inductance L 4, the 3rd switching tube, the 6th switching tube, the first transformer, the second transformer, system power supply module and feedback module;
With described electric capacity C5 while that the Same Name of Ends of the primary coil of described first transformer being the input of described switch transition unit, described resistance R12, described resistance R14, one end of described resistance R15 connects, described electric capacity C5, described resistance R12, described resistance R14, the other end of described resistance R15 is connected with the negative electrode of described diode D2 simultaneously, the anode of described diode D2 is connected with the different name end of the primary coil of described first transformer and the current input terminal of described 3rd switching tube simultaneously, the control end of described 3rd switching tube is that the first control end of described switch transition unit is connected with one end of described resistance R13, the other end of described resistance R13 is connected with the current output terminal of described 3rd switching tube Q3, the Same Name of Ends of the secondary coil of described first transformer simultaneously with described resistance R16, one end of described resistance R17 connects, described resistance R16, the other end of described resistance R17 is connected with one end of described electric capacity C6, the other end of described electric capacity C6 is connected with the negative electrode of described diode D3, the anode of described diode D3 is connected with the Same Name of Ends of the secondary coil of described first transformer, the different name end ground connection of the secondary coil of described first transformer, the other end of described electric capacity C6 is also respectively by described electric capacity C7, described electric capacity C9, described electric capacity C11, described electric capacity C13, described electric capacity C15 ground connection, the other end of described electric capacity C6 is also connected with one end of described inductance L 3 and described inductance L 4 simultaneously, with described resistance R18 while that the other end of described inductance L 3 and described inductance L 4 being the positive output end of described switch transition unit, one end of described resistance R19 connects, described resistance R18, the other end ground connection of described resistance R19,
With described electric capacity C20 while that the different name end of the primary coil of described second transformer being also the input of described switch transition unit, described resistance R25, described resistance R27, one end of described resistance R28 connects, described electric capacity C20, described resistance R25, described resistance R27, the other end of described resistance R28 is connected with the negative electrode of described diode D7 simultaneously, the anode of described diode D7 is connected with the Same Name of Ends of the primary coil of described second transformer and the current input terminal of described 6th switching tube simultaneously, the control end of described 6th switching tube is that the second control end of described switch transition unit is connected with one end of described resistance R24, the other end of described resistance R24 is connected with the current output terminal of described 6th switching tube, the Same Name of Ends of the secondary coil of described second transformer simultaneously with described resistance R29, one end of described resistance R30 connects, described resistance R29, the other end of described resistance R30 is connected with one end of described electric capacity C22, the other end of described electric capacity C22 is connected with the negative electrode of described diode D4, the anode of described diode D4 is connected with the Same Name of Ends of the secondary coil of described second transformer, the different name end ground connection of the secondary coil of described second transformer, the other end of described electric capacity C6 is also respectively by described electric capacity C8, described electric capacity C10, described electric capacity C12, described electric capacity C14, described electric capacity C16 ground connection, the other end of described electric capacity C22 is also connected with one end of described inductance L 1 and described inductance L 2 simultaneously, with described electric capacity C17 while that the other end of described inductance L 1 and described inductance L 2 being the positive output end of described switch transition unit, described electric capacity C18, one end of described electric capacity C19 connects, described electric capacity C17, described electric capacity C18, the other end of described electric capacity C19 is the negative output terminal ground connection of described switch transition unit,
One end of described resistance R37 is the feedback output end of described switch transition unit, the other end of described resistance R37 is respectively by described resistance R38-resistance R43 ground connection, and the other end of described resistance R37 is also connected with the current output terminal of described 3rd switching tube and described 6th switching tube simultaneously;
Described system power supply module to be transformer coupledly connected with described second by ancillary coil, and output system supply voltage;
First current input terminal of described feedback module is connected with the other end of described electric capacity C22, second current input terminal of described feedback module is the negative output terminal of described switch transition unit, the output of described feedback module is the isolation and amplifier end of described switch transition unit, and described feedback module is by photoelectric coupling output photoelectric switching signal.
Further, described system power supply module comprises:
Ancillary coil, resistance R26, electric capacity C21, electric capacity C25, electric capacity C26, diode D6, diode D8 and voltage-stabiliser tube;
The Same Name of Ends of described ancillary coil is connected with the anode of described diode D8, the negative electrode of described diode D8 is connected with one end of described resistance R26, the other end of described resistance R26 is connected with one end of described electric capacity C21 and the anode of described diode D6 simultaneously, the other end of described electric capacity C21 and the different name end of described ancillary coil ground connection simultaneously, with one end of described electric capacity C25 while that the negative electrode of described diode D6 being the output of described system power supply module, one end of described electric capacity C26 is connected with the negative electrode of described voltage-stabiliser tube, the other end of described electric capacity C25, the other end of described electric capacity C26 and the anode of described voltage-stabiliser tube ground connection simultaneously.
Further, described feedback module comprises:
Resistance R31-resistance R36, electric capacity C23, pressurizer and optocoupler;
One end of described resistance R31 is the first current input terminal of described feedback module, the other end of described resistance R31 is connected with the anode of one end of described resistance R32 and the light-emitting diode of described optocoupler simultaneously, the negative electrode of the light-emitting diode of described optocoupler is connected with the other end of described resistance R32, the input of the coupled apparatus of described optocoupler is the output of described feedback module, the output head grounding of the coupled apparatus of described optocoupler, the other end of described resistance R32 is also connected with one end of described electric capacity C23 and the negative electrode of described pressurizer simultaneously, the plus earth of described pressurizer, the other end of described electric capacity C23 is connected with one end of described resistance R33, the reference edge of described pressurizer is connected with the other end of described resistance R33, the other end of described resistance R33 is also connected with one end of described resistance R35, one end of described resistance R35 is also respectively by resistance R34 and described resistance R36 ground connection, the other end of described resistance R35 is the second current input terminal of described feedback module.
Another object of the utility model embodiment is, provides a kind of AC-DC power supply adopting above-mentioned high-power flyback sourse circuit.
The utility model embodiment drives two switching tubes by two transformers, by the primary parallel of two transformers, secondaryly separate complete machine, thus enable power reach more than 300W, and efficiency can up to 87%, the circuit framework that the utility model provides is simple, and power can be accomplished very large, thus has effectively saved components and parts cost.
Accompanying drawing explanation
The structure chart of the high-power flyback sourse circuit that Fig. 1 provides for the utility model embodiment;
The exemplary circuit structure chart of the high-power flyback sourse circuit that Fig. 2 provides for the utility model embodiment;
The exemplary circuit structure chart of the high-power flyback sourse circuit breaker in middle converting unit that Fig. 3 provides for the embodiment of the present invention.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each execution mode of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
The utility model embodiment drives two switching tubes by two transformers, by the primary parallel of two transformers, secondaryly separates complete machine, thus power is increased greatly, effectively saved components and parts cost.
Below in conjunction with specific embodiment, realization of the present utility model is described in detail:
Fig. 1 shows the structure of the high-power flyback sourse circuit that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model.
As the utility model one embodiment, this high-power flyback sourse circuit can be applied in any flyback power supply, and this high-power flyback sourse circuit comprises:
Protected location 11, for realizing overvoltage/overcurrent protection, rear class short-circuit protection and anti-tampering function, two inputs of protected location 11 connect alternating current;
In the utility model embodiment; this protected location 11 can be made up of insurance, lightning protection, Anti-surging electric current and EMI (Electro Magnetic Compatibility) element; play rear class short-circuit protection, suppress external interference source and hinder the interference source of power supply self generation to flow to the effects such as AC network.
Rectification filtering unit 12, for alternating current is converted to level and smooth high voltage direct current, two inputs of rectification filtering unit 12 are connected with two outputs of protected location 11;
In the utility model embodiment, AC rectification is become direct current by this rectification filtering unit 12, and obtains level and smooth direct current by filter capacitor.
Driving control unit 13, for generating the identical drive singal of two-way according to high voltage direct current, the input of driving control unit 13 is connected with the output of rectification filtering unit 12;
In the utility model embodiment, the drive singal of generation strengthens by this driving control unit 13, enables the switching tube driven below.
Switch transition unit 14, this switch transition unit 14 has two switching tubes and two transformers, for driving two switching tubes according to two-way drive singal simultaneously, realize two-way voltage transitions, and generate detection current feedback to driving control unit 13, the primary parallel of two transformers of switch transition unit 14, secondaryly separate complete machine, the input of switch transition unit 14 is connected with the output of rectification filtering unit 12, first of switch transition unit 14, first of second control end and driving control unit 13, second output correspondence connects, the feedback output end of switch transition unit 14 is connected with the current detecting end of driving control unit 13, the isolation and amplifier end of switch transition unit 14 is connected with the loop compensation end of driving control unit 13, the direct voltage of two output stable outputs of switch transition unit 14.
In the utility model embodiment, power is increased by two transformers, two identical drive singal are adopted to drive two switching tubes, and the corresponding transformer of each switching tube, can by the primary parallel of two transformers, secondaryly separate complete machine, thus enable power reach more than 300W, and efficiency can up to 87%.
Simultaneously, the current output terminal (source electrode of metal-oxide-semiconductor) of two switching tubes is all connected with detection resistance, by the detection current feedback from the acquisition of detection resistance to driving control unit 13, driving control unit 13 goes to control the duty ratio of drive singal by detecting electric current, because two drive singal are identical, generated by same drive circuit, therefore the duty ratio of two drive singal is inevitable identical, now go driving two switching tubes (metal-oxide-semiconductor) again, would not occur that a transformer efficiency is very large, the phenomenon that another transformer efficiency is very little.Further, by the metal-oxide-semiconductor of selecting internal resistance smaller and select the fin of good heat dissipation effect to solve the problem of temperature rise.
Fig. 2 shows the exemplary circuit structure of the high-power flyback sourse circuit that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model.
As the utility model one embodiment, this protected location 11 comprises:
Fuse F1, thermistor RT1, piezo-resistance RV1, the first excitation coil LF1, the second excitation coil LF2, electric capacity CX1, electric capacity CY1, electric capacity CY2, resistance R1, resistance R2, resistance R3, resistance R4;
One end of fuse F1 is an input of protected location, the other end of fuse F1 is connected with one end of piezo-resistance RV1 and the elementary Same Name of Ends of the first excitation coil LF1 simultaneously, one end of thermistor RT1 is another input of protected location, the other end of thermistor RT1 is connected with the other end of piezo-resistance RV1 and the secondary Same Name of Ends of the first excitation coil LF1 simultaneously, the elementary different name end of the first excitation coil LF1 is connected with one end of electric capacity CX1 and one end of resistance R1 simultaneously, the other end of electric capacity CX1 is connected with the secondary different name end of the first excitation coil LF1, one end of resistance R1 is also connected with one end of resistance R3 and the elementary different name end of the second excitation coil LF2 simultaneously, the other end of resistance R1 simultaneously with the other end of resistance R3, one end of resistance R2 is connected with one end of resistance R4, the other end of resistance R2 is all connected with the other end of electric capacity CX1 with the other end of resistance R4, the other end of resistance R4 is also connected with the secondary different name end of the second excitation coil LF2, the elementary Same Name of Ends of the second excitation coil LF2 is that an output of protected location is by electric capacity CY1 ground connection, the secondary Same Name of Ends of the second excitation coil LF2 is that another output of protected location is by electric capacity CY2 ground connection.
In the utility model embodiment; the all right connecting interface CON1 of input of protected location 11 is so that grafting application; in protected location 11; if the AC current of input is excessive can realize protection by the mode of fuse wire F1; thermistor RT1 cuts off electric current when circuit temperature is too high by increasing resistance; piezo-resistance RV1 can play the effect of moment overvoltage protection to circuit, avoid the infringement that thunder and lightning signal and surge current cause circuit.
Rectification filtering unit 12 comprises:
Electric capacity C1, electric capacity C2, electric capacity C3 and rectifier bridge BR1;
Two inputs that two inputs (3,2) of rectifier bridge BR1 are rectification filtering unit, one output 1 of rectifier bridge BR1 is connected with one end of electric capacity C1, electric capacity C2, electric capacity C3 while of being the output of rectification filtering unit, the other end of electric capacity C1, electric capacity C2, electric capacity C3 and another output 4 of rectifier bridge BR1 ground connection simultaneously.
Driving control unit 13 comprises:
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, electric capacity C4, electric capacity C24, the first active matrix driving module 131, second active matrix driving module 132 and driving chip U1;
One end of resistance R8 is the input of driving control unit 13, the other end of resistance R8 is connected with one end of resistance R7 and one end of resistance R9 simultaneously, the other end of resistance R7 is connected with the detection pin CS of driving chip U1 by resistance R6, the detection pin CS of driving chip U1 is that the current detecting end of driving control unit 13 is by electric capacity C24 ground connection, the other end of resistance R9 is connected with the startup pin HV of driving chip U1, the output frequency setting pin RT of driving chip U1 is by resistance R5 ground connection, the loop compensation pin COMP of driving chip U1 is that the loop compensation end of driving control unit 13 is by electric capacity C4 ground connection, the power pins VCC connected system supply voltage IC-VCC of driving chip U1, the grounding pin GND ground connection of driving chip U1, driving chip U1 does not select pin NC unsettled, the output pin OUT of driving chip U1 is connected with the input of the first active matrix driving module 131 and the input of the second active matrix driving module 132 simultaneously, the output of the first active matrix driving module 131 and the output of the second active matrix driving module 132 are respectively first of driving control unit 13, second output.
In the utility model embodiment, output frequency can be changed by the resistance changing resistance R5.
As the utility model one preferred embodiment, the first active matrix driving module 131 comprises:
Resistance R10, resistance R11, resistance R21, the first triode Q1, the second triode Q2 and diode D1;
One end of resistance R21 is the input of the first active matrix driving module 131, the other end of resistance R21 simultaneously with the first triode Q1, the control end of the second triode Q2 connects, the current input terminal of the first triode Q1 is connected with system power source voltage IC-VCC by resistance R10, the current output terminal of the first triode Q1 is connected with the current input terminal of the second triode Q2, the current output terminal ground connection of the second triode Q2, the current input terminal of the first triode Q1 is also connected with one end of resistance R11 and the negative electrode of diode D1 simultaneously, the other end of resistance R11 is that the output of the first active matrix driving module 131 is connected with the anode of diode D1,
As the utility model one preferred embodiment, the second active matrix driving module 132 comprises:
Resistance R20, resistance R22, resistance R23, the 4th triode Q4, the 5th triode Q5 and diode D5;
One end of resistance R20 is the input of the second active matrix driving module 132, the other end of resistance R20 simultaneously with the 4th triode Q4, the control end of the 5th triode Q5 connects, the current input terminal of the 4th triode Q4 is connected with system power source voltage IC-VCC by resistance R22, the current output terminal of the 4th triode Q4 is connected with the current input terminal of the 5th triode Q5, the current output terminal ground connection of the 5th triode Q5, the current input terminal of the 4th triode Q4 is also connected with one end of resistance R23 and the negative electrode of diode D5 simultaneously, the other end of resistance R23 is that the output of the second active matrix driving module 132 is connected with the anode of diode D5.
Preferably, the first triode Q1 and the 4th triode Q4 can select NPN type triode to realize;
The base stage of NPN type triode is the control end of the first triode Q1 and the 4th triode Q4, the current input terminal of the current collection of NPN type triode very the first triode Q1 and the 4th triode Q4, the current output terminal of the transmitting of NPN type triode very the first triode Q1 and the 4th triode Q4;
Preferably, the second triode Q2 and the 5th triode Q5 can select PNP type triode to realize;
The base stage of PNP type triode is the control end of the second triode Q2 and the 5th triode Q5, the current input terminal of the transmitting of PNP type triode very the second triode Q2 and the 5th triode Q5, the current output terminal of the current collection of PNP type triode very the second triode Q2 and the 5th triode Q5.
As the utility model one preferred embodiment, driving chip U1 is PWM (PulseWidthModulation, pulse width modulation) process chip.
Composition graphs 3, switch transition unit 14 comprises:
Resistance R12-resistance R19, resistance R24-resistance R30, resistance R37-resistance R43, electric capacity C5-electric capacity C20, electric capacity C22, electric capacity CY3, diode D2, diode D3, diode D4, diode D7, inductance L 1-inductance L 4, the 3rd switching tube Q3, the 6th switching tube Q6, the first transformer T1, the second transformer T2, system power supply module 141 and feedback module 142;
With electric capacity C5 while that the Same Name of Ends of the primary coil N1 of the first transformer T1 being the input of switch transition unit 14, resistance R12, resistance R14, one end of resistance R15 connects, electric capacity C5, resistance R12, resistance R14, the other end of resistance R15 is connected with the negative electrode of diode D2 simultaneously, the anode of diode D2 is connected with the different name end of the primary coil N1 of the first transformer T1 and the current input terminal of the 3rd switching tube Q3 simultaneously, the control end of the 3rd switching tube Q3 is that the first control end of switch transition unit 14 is connected with one end of resistance R13, the other end of resistance R13 is connected with the current output terminal of the 3rd switching tube Q3, the Same Name of Ends of the secondary coil N2 of the first transformer T1 simultaneously with resistance R16, one end of resistance R17 connects, resistance R16, the other end of resistance R17 is connected with one end of electric capacity C6, the other end of electric capacity C6 is connected with the negative electrode of diode D3, the anode of diode D3 is connected with the Same Name of Ends of the secondary coil N2 of the first transformer T1, the different name end ground connection of the secondary coil N2 of the first transformer T1, the other end of electric capacity C6 is also respectively by electric capacity C7, electric capacity C9, electric capacity C11, electric capacity C13, electric capacity C15 ground connection, the other end of electric capacity C6 is also connected with one end of inductance L 3 and inductance L 4 simultaneously, with resistance R18 while that the other end of inductance L 3 and inductance L 4 being the positive output end of switch transition unit 14, one end of resistance R19 connects, resistance R18, the other end ground connection of resistance R19,
With electric capacity C20 while that the different name end of the primary coil N1 of the second transformer T2 being also the input of switch transition unit 14, resistance R25, resistance R27, one end of resistance R28 connects, electric capacity C20, resistance R25, resistance R27, the other end of resistance R28 is connected with the negative electrode of diode D7 simultaneously, the anode of diode D7 is connected with the Same Name of Ends of the primary coil N1 of the second transformer T2 and the current input terminal of the 6th switching tube Q6 simultaneously, the control end of the 6th switching tube Q6 is that the second control end of switch transition unit 14 is connected with one end of resistance R24, the other end of resistance R24 is connected with the current output terminal of the 6th switching tube Q6, the Same Name of Ends of the secondary coil N2 of the second transformer T2 simultaneously with resistance R29, one end of resistance R30 connects, resistance R29, the other end of resistance R30 is connected with one end of electric capacity C22, the other end of electric capacity C22 is connected with the negative electrode of diode D4, the anode of diode D4 is connected with the Same Name of Ends of the secondary coil N2 of the second transformer T2, the different name end ground connection of the secondary coil N2 of the second transformer T2, the other end of electric capacity C6 is also respectively by electric capacity C8, electric capacity C10, electric capacity C12, electric capacity C14, electric capacity C16 ground connection, the other end of electric capacity C22 is also connected with one end of inductance L 1 and inductance L 2 simultaneously, with electric capacity C17 while that the other end of inductance L 1 and inductance L 2 being the positive output end of switch transition unit 14, electric capacity C18, one end of electric capacity C19 connects, electric capacity C17, electric capacity C18, the other end of electric capacity C19 is the negative output terminal ground connection of switch transition unit 14,
One end of resistance R37 is the feedback output end of switch transition unit 14, and the other end of resistance R37 is respectively by resistance R38-resistance R43 ground connection, and the other end of resistance R37 is also connected with the current output terminal of the 3rd switching tube Q3 and the 6th switching tube Q6 simultaneously;
System power supply module 141 to be transformer coupledly connected with second by ancillary coil, and output system supply voltage;
First current input terminal of feedback module 142 is connected with the other end of electric capacity C22, second current input terminal of feedback module 142 is the negative output terminal of switch transition unit 14, the output of feedback module 142 is the isolation and amplifier end of switch transition unit 14, and feedback module 142 is by photoelectric coupling output photoelectric switching signal.
Preferably, diode D3, diode D4 all can adopt Schottky diode to realize.
Certainly, an interface JP1 can also be connected at the output of switch transition unit 14 so that grafting application.
As the utility model one preferred embodiment, system power supply module 141 comprises:
Ancillary coil N3, resistance R26, electric capacity C21, electric capacity C25, electric capacity C26, diode D6, diode D8 and voltage-stabiliser tube ZD1;
The Same Name of Ends of ancillary coil N3 is connected with the anode of diode D8, the negative electrode of diode D8 is connected with one end of resistance R26, the other end of resistance R26 is connected with one end of electric capacity C21 and the anode of diode D6 simultaneously, the other end of electric capacity C21 and the different name end of ancillary coil N3 ground connection simultaneously, the negative electrode of diode D6 is that the output of system power supply module 141 is connected with the negative electrode of one end of electric capacity C25, one end of electric capacity C26 and voltage-stabiliser tube ZD1 simultaneously, the ground connection while of the anode of the other end of electric capacity C25, the other end of electric capacity C26 and voltage-stabiliser tube ZD1.
As the utility model one preferred embodiment, feedback module 142 comprises:
Resistance R31-resistance R36, electric capacity C23, pressurizer U2 and optocoupler OT1A-B;
One end of resistance R31 is the first current input terminal of feedback module 142, the other end of resistance R31 is connected with the anode of one end of resistance R32 and the light-emitting diode OT1A of optocoupler simultaneously, the negative electrode of the light-emitting diode OT1A of optocoupler is connected with the other end of resistance R32, the input of the coupled apparatus OT1B of optocoupler is the output of feedback module 142, the output head grounding of the coupled apparatus OT1B of optocoupler, the other end of resistance R32 is also connected with one end of electric capacity C23 and the negative electrode of pressurizer U2 simultaneously, the plus earth of pressurizer U2, the other end of electric capacity C23 is connected with one end of resistance R33, the reference edge of pressurizer U2 is connected with the other end of resistance R33, the other end of resistance R33 is also connected with one end of resistance R35, one end of resistance R35 is also respectively by resistance R34 and resistance R36 ground connection, the other end of resistance R35 is the second current input terminal of feedback module 142.
As the utility model one preferred embodiment, pressurizer U2 can adopt adjustable accurate shunt regulator to realize.
As the utility model one preferred embodiment, switch transition unit 14 can also comprise electric capacity CY3, the two ends ground connection respectively of this electric capacity CY3, this electric capacity CY3 can solve conducting problem as EMI element across the primary and secondary two ends of transformer, plays filtering effect to some the coupling clutters inside transformer.
In the utility model embodiment, when high direct voltage arrives the startup pin HV (the 8th pin) of driving chip U1 after resistance R8, resistance R9 dividing potential drop, the output pin OUT (the 5th pin) of driving chip U1 will export square-wave signal, driving the 3rd switching tube Q3 and the 6th switching tube Q6 is removed respectively through two active matrix driving modules, owing to being that same square wave outputs on these two metal-oxide-semiconductors, so their service time is consistent.When after the 3rd switching tube Q3 and the 6th switching tube Q6 conducting, high voltage direct current flows into ground after over-current detection resistance R38-R42 respectively through gathering after the primary coil N1 of transformer T1, transformer T2 and the 3rd switching tube Q3 and the 6th switching tube Q6, a so just formation loop.
In addition, system power supply module 141 is that triode Q1, Q2, Q4, Q5 in driving chip U1 and active matrix driving module powers.After the 3rd switching tube Q3 and the 6th switching tube Q6 ends, the secondary coil N2 of the first transformer T1 and the second transformer T2 by just grade coupled energy after diode D3, diode D4 rectification, charge to electric capacity C7-C16 again, after charging, provide energy to load again.
Not only in the utility model embodiment, optocoupler fed back before primary and secondary, by opto-electronic conversion, played and isolated but also can communication effect.
Another object of the utility model embodiment is, provides a kind of AC-DC power supply adopting above-mentioned high-power flyback sourse circuit.
The utility model embodiment drives two switching tubes by two transformers, by the primary parallel of two transformers, secondaryly separate complete machine, thus enable power reach more than 300W, and efficiency can up to 87%, the circuit framework that the utility model provides is simple, and power can be accomplished very large, thus has effectively saved components and parts cost.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a high-power flyback sourse circuit, is characterized in that, described circuit comprises:
Realize the protected location of overvoltage/overcurrent protection, rear class short-circuit protection and anti-tampering function, two inputs of described protected location connect alternating currents;
Alternating current is converted to the rectification filtering unit of level and smooth high voltage direct current, two inputs of described rectification filtering unit are connected with two outputs of described protected location;
Generate the driving control unit of the identical drive singal of two-way according to high voltage direct current, the input of described driving control unit is connected with the output of described rectification filtering unit;
Drive two switching tubes according to two-way drive singal simultaneously, realize two-way voltage transitions, and generate detection current feedback to the switch transition unit of described driving control unit, described switch transition unit has two switching tubes and two transformers, the primary parallel of two transformers of described switch transition unit, the input of described switch transition unit is connected with the output of described rectification filtering unit, first of described switch transition unit, second control end respectively with first of described driving control unit, second output correspondence connects, the feedback output end of described switch transition unit is connected with the current detecting end of described driving control unit, the isolation and amplifier end of described switch transition unit is connected with the loop compensation end of described driving control unit, the direct voltage of two output stable outputs of described switch transition unit.
2. circuit as claimed in claim 1, it is characterized in that, described protected location comprises:
Fuse, thermistor, piezo-resistance, the first excitation coil, the second excitation coil, electric capacity CX1, electric capacity CY1, electric capacity CY2, resistance R1, resistance R2, resistance R3, resistance R4;
One end of described fuse is an input of described protected location, the other end of described fuse is connected with one end of described piezo-resistance and the elementary Same Name of Ends of described first excitation coil simultaneously, one end of described thermistor is another input of described protected location, the other end of described thermistor is connected with the other end of described piezo-resistance and the secondary Same Name of Ends of described first excitation coil simultaneously, the elementary different name end of described first excitation coil is connected with one end of described electric capacity CX1 and one end of resistance R1 simultaneously, the other end of described electric capacity CX1 is connected with the secondary different name end of described first excitation coil, one end of described resistance R1 is also connected with one end of described resistance R3 and the elementary different name end of described second excitation coil simultaneously, the other end of described resistance R1 simultaneously with the other end of described resistance R3, one end of described resistance R2 is connected with one end of described resistance R4, the other end of described resistance R2 is all connected with the other end of described electric capacity CX1 with the other end of described resistance R4, the other end of described resistance R4 is also connected with the secondary different name end of described second excitation coil, the elementary Same Name of Ends of described second excitation coil is that an output of described protected location is by described electric capacity CY1 ground connection, the secondary Same Name of Ends of described second excitation coil is that another output of described protected location is by described electric capacity CY2 ground connection.
3. circuit as claimed in claim 2, it is characterized in that, described rectification filtering unit comprises:
Electric capacity C1, electric capacity C2, electric capacity C3 and rectifier bridge;
Two inputs of described rectifier bridge are two inputs of described rectification filtering unit, one output of described rectifier bridge is connected with one end of described electric capacity C1, described electric capacity C2, described electric capacity C3 while of being the output of described rectification filtering unit, the other end of described electric capacity C1, described electric capacity C2, described electric capacity C3 and another output of described rectifier bridge ground connection simultaneously.
4. circuit as claimed in claim 1, it is characterized in that, described driving control unit comprises:
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, electric capacity C4, electric capacity C24, the first active matrix driving module, the second active matrix driving module and driving chip;
One end of described resistance R8 is the input of described driving control unit, the other end of described resistance R8 is connected with one end of described resistance R7 and one end of described resistance R9 simultaneously, the other end of described resistance R7 is connected with the detection pin (CS) of described driving chip by described resistance R6, the current detecting end that the detection pin (CS) of described driving chip is described driving control unit passes through described electric capacity C24 ground connection, the other end of described resistance R9 is connected with the startup pin (HV) of described driving chip, output frequency setting pin (RT) of described driving chip is by described resistance R5 ground connection, the loop compensation end that the loop compensation pin (COMP) of described driving chip is described driving control unit passes through described electric capacity C4 ground connection, the output pin (OUT) of described driving chip is connected with the input of described first active matrix driving module and the input of described second active matrix driving module simultaneously, the output of described first active matrix driving module and the output of described second active matrix driving module are respectively first of described driving control unit, second output.
5. circuit as claimed in claim 4, it is characterized in that, described first active matrix driving module comprises:
Resistance R10, resistance R11, resistance R21, the first triode, the second triode and diode D1;
One end of described resistance R21 is the input of described first active matrix driving module, the other end of described resistance R21 simultaneously with described first triode, the control end of described second triode connects, the current input terminal of described first triode is connected with system power source voltage by described resistance R10, the current output terminal of described first triode is connected with the current input terminal of described second triode, the current output terminal ground connection of described second triode, the current input terminal of described first triode is also connected with one end of described resistance R11 and the negative electrode of described diode D1 simultaneously, the other end of described resistance R11 is that the output of described first active matrix driving module is connected with the anode of described diode D1,
Described second active matrix driving module comprises:
Resistance R20, resistance R22, resistance R23, the 4th triode, the 5th triode and diode D5;
One end of described resistance R20 is the input of described second active matrix driving module, the other end of described resistance R20 simultaneously with described 4th triode, the control end of described 5th triode connects, the current input terminal of described 4th triode is connected with system power source voltage by described resistance R22, the current output terminal of described 4th triode is connected with the current input terminal of described 5th triode, the current output terminal ground connection of described 5th triode, the current input terminal of described 4th triode is also connected with one end of described resistance R23 and the negative electrode of described diode D5 simultaneously, the other end of described resistance R23 is that the output of described second active matrix driving module is connected with the anode of described diode D5.
6. circuit as claimed in claim 4, it is characterized in that, described driving chip is PWM process chip.
7. circuit as claimed in claim 1, it is characterized in that, described switch transition unit comprises:
Resistance R12-resistance R19, resistance R24-resistance R30, resistance R37-resistance R43, electric capacity C5-electric capacity C20, electric capacity C22, electric capacity CY3, diode D2, diode D3, diode D4, diode D7, inductance L 1-inductance L 4, the 3rd switching tube, the 6th switching tube, the first transformer, the second transformer, system power supply module and feedback module;
With described electric capacity C5 while that the Same Name of Ends of the primary coil of described first transformer being the input of described switch transition unit, described resistance R12, described resistance R14, one end of described resistance R15 connects, described electric capacity C5, described resistance R12, described resistance R14, the other end of described resistance R15 is connected with the negative electrode of described diode D2 simultaneously, the anode of described diode D2 is connected with the different name end of the primary coil of described first transformer and the current input terminal of described 3rd switching tube simultaneously, the control end of described 3rd switching tube is that the first control end of described switch transition unit is connected with one end of described resistance R13, the other end of described resistance R13 is connected with the current output terminal of described 3rd switching tube Q3, the Same Name of Ends of the secondary coil of described first transformer simultaneously with described resistance R16, one end of described resistance R17 connects, described resistance R16, the other end of described resistance R17 is connected with one end of described electric capacity C6, the other end of described electric capacity C6 is connected with the negative electrode of described diode D3, the anode of described diode D3 is connected with the Same Name of Ends of the secondary coil of described first transformer, the different name end ground connection of the secondary coil of described first transformer, the other end of described electric capacity C6 is also respectively by described electric capacity C7, described electric capacity C9, described electric capacity C11, described electric capacity C13, described electric capacity C15 ground connection, the other end of described electric capacity C6 is also connected with one end of described inductance L 3 and described inductance L 4 simultaneously, with described resistance R18 while that the other end of described inductance L 3 and described inductance L 4 being the positive output end of described switch transition unit, one end of described resistance R19 connects, described resistance R18, the other end ground connection of described resistance R19,
With described electric capacity C20 while that the different name end of the primary coil of described second transformer being also the input of described switch transition unit, described resistance R25, described resistance R27, one end of described resistance R28 connects, described electric capacity C20, described resistance R25, described resistance R27, the other end of described resistance R28 is connected with the negative electrode of described diode D7 simultaneously, the anode of described diode D7 is connected with the Same Name of Ends of the primary coil of described second transformer and the current input terminal of described 6th switching tube simultaneously, the control end of described 6th switching tube is that the second control end of described switch transition unit is connected with one end of described resistance R24, the other end of described resistance R24 is connected with the current output terminal of described 6th switching tube, the Same Name of Ends of the secondary coil of described second transformer simultaneously with described resistance R29, one end of described resistance R30 connects, described resistance R29, the other end of described resistance R30 is connected with one end of described electric capacity C22, the other end of described electric capacity C22 is connected with the negative electrode of described diode D4, the anode of described diode D4 is connected with the Same Name of Ends of the secondary coil of described second transformer, the different name end ground connection of the secondary coil of described second transformer, the other end of described electric capacity C6 is also respectively by described electric capacity C8, described electric capacity C10, described electric capacity C12, described electric capacity C14, described electric capacity C16 ground connection, the other end of described electric capacity C22 is also connected with one end of described inductance L 1 and described inductance L 2 simultaneously, with described electric capacity C17 while that the other end of described inductance L 1 and described inductance L 2 being the positive output end of described switch transition unit, described electric capacity C18, one end of described electric capacity C19 connects, described electric capacity C17, described electric capacity C18, the other end of described electric capacity C19 is the negative output terminal ground connection of described switch transition unit,
One end of described resistance R37 is the feedback output end of described switch transition unit, the other end of described resistance R37 is respectively by described resistance R38-resistance R43 ground connection, and the other end of described resistance R37 is also connected with the current output terminal of described 3rd switching tube and described 6th switching tube simultaneously;
Described system power supply module to be transformer coupledly connected with described second by ancillary coil, and output system supply voltage;
First current input terminal of described feedback module is connected with the other end of described electric capacity C22, second current input terminal of described feedback module is the negative output terminal of described switch transition unit, the output of described feedback module is the isolation and amplifier end of described switch transition unit, and described feedback module is by photoelectric coupling output photoelectric switching signal.
8. circuit as claimed in claim 7, it is characterized in that, described system power supply module comprises:
Ancillary coil, resistance R26, electric capacity C21, electric capacity C25, electric capacity C26, diode D6, diode D8 and voltage-stabiliser tube;
The Same Name of Ends of described ancillary coil is connected with the anode of described diode D8, the negative electrode of described diode D8 is connected with one end of described resistance R26, the other end of described resistance R26 is connected with one end of described electric capacity C21 and the anode of described diode D6 simultaneously, the other end of described electric capacity C21 and the different name end of described ancillary coil ground connection simultaneously, with one end of described electric capacity C25 while that the negative electrode of described diode D6 being the output of described system power supply module, one end of described electric capacity C26 is connected with the negative electrode of described voltage-stabiliser tube, the other end of described electric capacity C25, the other end of described electric capacity C26 and the anode of described voltage-stabiliser tube ground connection simultaneously.
9. circuit as claimed in claim 7, it is characterized in that, described feedback module comprises:
Resistance R31-resistance R36, electric capacity C23, pressurizer and optocoupler;
One end of described resistance R31 is the first current input terminal of described feedback module, the other end of described resistance R31 is connected with the anode of one end of described resistance R32 and the light-emitting diode of described optocoupler simultaneously, the negative electrode of the light-emitting diode of described optocoupler is connected with the other end of described resistance R32, the input of the coupled apparatus of described optocoupler is the output of described feedback module, the output head grounding of the coupled apparatus of described optocoupler, the other end of described resistance R32 is also connected with one end of described electric capacity C23 and the negative electrode of described pressurizer simultaneously, the plus earth of described pressurizer, the other end of described electric capacity C23 is connected with one end of described resistance R33, the reference edge of described pressurizer is connected with the other end of described resistance R33, the other end of described resistance R33 is also connected with one end of described resistance R35, one end of described resistance R35 is also respectively by resistance R34 and described resistance R36 ground connection, the other end of described resistance R35 is the second current input terminal of described feedback module.
10. an AC-DC power supply, is characterized in that, described AC-DC power supply comprises the high-power flyback sourse circuit as described in any one of claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520428594.6U CN204928602U (en) | 2015-06-19 | 2015-06-19 | Power supply circuit and AC -DC power are swashed to high -power reverse side |
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| CN201520428594.6U CN204928602U (en) | 2015-06-19 | 2015-06-19 | Power supply circuit and AC -DC power are swashed to high -power reverse side |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305846A (en) * | 2015-06-19 | 2016-02-03 | 惠科电子（深圳）有限公司 | High-power flyback power supply circuit and AC-DC power supply |
| CN107493014A (en) * | 2017-09-11 | 2017-12-19 | 无锡华汇金泽电子科技有限公司 | A kind of reverse excitation circuit of high-power output |
| CN108336917A (en) * | 2018-04-13 | 2018-07-27 | 王晓 | A kind of switching power circuit |
-
2015
- 2015-06-19 CN CN201520428594.6U patent/CN204928602U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305846A (en) * | 2015-06-19 | 2016-02-03 | 惠科电子（深圳）有限公司 | High-power flyback power supply circuit and AC-DC power supply |
| CN107493014A (en) * | 2017-09-11 | 2017-12-19 | 无锡华汇金泽电子科技有限公司 | A kind of reverse excitation circuit of high-power output |
| CN108336917A (en) * | 2018-04-13 | 2018-07-27 | 王晓 | A kind of switching power circuit |
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Address after: 518000 Guangdong city of Shenzhen province Baoan District Shiyan street water Tamura Private Industrial Park Industrial Park, building 1 HKC 2, 3 Patentee after: Aucan Limited by Share Ltd Address before: 518000 Guangdong city of Shenzhen province Baoan District Shiyan street water Tamura Private Industrial Park Industrial Park, building 1 HKC 2, 3 Patentee before: HKC Electronic (Shenzhen) Co., Ltd. |