CN204858973U - Isolation feedback supply circuit of LLC resonant transformation ware - Google Patents

Isolation feedback supply circuit of LLC resonant transformation ware Download PDF

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Publication number
CN204858973U
CN204858973U CN201520515541.8U CN201520515541U CN204858973U CN 204858973 U CN204858973 U CN 204858973U CN 201520515541 U CN201520515541 U CN 201520515541U CN 204858973 U CN204858973 U CN 204858973U
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circuit
power supply
supply circuits
vice
output
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CN201520515541.8U
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杨柳艺
钟志斌
张群
林淡
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Suctrn Technology Co Ltd
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Suctrn Technology Co Ltd
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Abstract

The utility model belongs to the technical field of the converter, the feedback supply circuit of the high voltage isolation output of a concretely relates to LLC resonant transformation ware. An isolation feedback supply circuit of LLC resonant transformation ware, it includes: switching network, resonance network, isolation transformer, rectification filter circuit, supply circuit and voltage feedback circuit, resonance network one end is connected with switching network, and the other end is connected in isolation transformer's primary side winding, isolation transformer's vice limit winding includes first pair of limit winding and the vice limit of second winding, and first pair of limit winding is connected with rectification filter circuit's input, supply circuit's input is connected in isolation transformer's the vice limit of second winding, and supply circuit's the output and the input of voltage feedback circuit are connected, the output of voltage feedback circuit is parallelly connected with rectification filter circuit's output. The utility model discloses can be applied to switching power supply's LLC resonant transformation ware.

Description

A kind of isolation feedback power supply circuits of LLC resonant converter
Technical field
The utility model belongs to converter technical field, the feedback power supply circuits that the high_voltage isolation being specifically related to a kind of LLC resonant converter exports.
Background technology
Along with the development of present power electronic technology, Switching Power Supply is towards the future development of high frequency.Improve switching frequency and can reduce device volume, improve power density and the reliability of equipment.LLC Series-Parallel Resonant Converter (Series-ParallelResonanceCircuit, SPRC) because it can realize Sofe Switch, effectively reduce switching loss, and reduce switching noise, frequency can be improved further, therefore, LLC resonant converter is widely used in HF power conversion field.
In field of power, the uninterrupted DC power supply that high_voltage isolation exports occupies the very large market share.The feedback circuit that high_voltage isolation exports often adopts TL431 reference voltage stabilizing source to carry out Voltage Feedback, if provide certain electric current to need to consume larger power consumption from high-voltage output end for TL431 reference voltage stabilizing source, does not meet high efficiency requirement.Or adopt an isolation DC/DC power module to provide power supply for TL431, but this can bring certain influence to the reliability and stability of Circuits System, also can increase the cost of Circuits System simultaneously.
Utility model content
For the power supply circuits Problems existing of existing LLC resonant converter, the utility model discloses a kind of isolation feedback power supply circuits of LLC resonant converter, get separately one group of low-voltage, for feedback circuit is powered from isolating transformer.From output high-pressure side power taking or other DC/DC insulating power supply module need not be used, not only reduce power consumption and the cost of Circuits System, also improve the reliability and stability of circuit.
The utility model adopts following technical scheme:
A kind of isolation feedback power supply circuits of LLC resonant converter, it comprises: switching network, resonant network, isolating transformer, current rectifying and wave filtering circuit, power supply circuits and voltage feedback circuit, resonant network one end is connected with switching network, and the other end is connected to the former limit winding of isolating transformer; The vice-side winding of isolating transformer comprises the first vice-side winding and the second vice-side winding, and the first vice-side winding is connected with the input of current rectifying and wave filtering circuit; The input of power supply circuits is connected to the second vice-side winding of isolating transformer, and the output of power supply circuits is connected with the power end of voltage feedback circuit; The input of voltage feedback circuit is in parallel with the output of current rectifying and wave filtering circuit.
Further, Voltage Feedback control circuit comprises: photoelectrical coupler and voltage stabilizing circuit, and the output of power supply circuits is connected to the positive pole of photoelectrical coupler input, and current rectifying and wave filtering circuit exports the negative pole being connected to photoelectrical coupler input after voltage stabilizing circuit.
Further, voltage stabilizing circuit comprises a three-terminal voltage regulator and a bleeder circuit, and current rectifying and wave filtering circuit exports and connects bleeder circuit, and the dividing potential drop output of this bleeder circuit is connected to the adjustable side of this three-terminal voltage regulator.
Further, three-terminal voltage regulator is the pressurizer of TL341 model.
Further, power supply circuits comprise the second rectifier bridge, the 3rd electric capacity and the second resistance, after the second rectifier bridge and the 3rd Capacitance parallel connection, then with the second resistant series.
Further, the second rectifier bridge is full-bridge circuit or half-bridge circuit.
Further, current rectifying and wave filtering circuit comprises the first rectifier bridge and the second electric capacity, the first rectifier bridge and the second Capacitance parallel connection.
Further, the first rectifier bridge is full-bridge circuit or half-bridge circuit.
The utility model has the following advantages relative to prior art tool:
1. the utility model circuit is by increase by one group of Transformer Winding and current rectifying and wave filtering circuit, exports the accessory power supply voltage more much lower than major loop High voltage output, for feedback circuit provides required electric current.The utility model with directly compared with High voltage output power taking, substantially reduce power consumption, improve the efficiency of this system of circuit;
2. DC/DC power module is isolated in the utility model circuit and employing one provides compared with the circuit of power supply for feedback circuit, and circuit structure is simple, can reduce the cost of Circuits System and improve the reliability of Circuits System.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the isolation feedback power supply circuits of LLC resonant converter.
Embodiment
For further illustrating each embodiment, the utility model provides accompanying drawing.These accompanying drawings are a part for the utility model disclosure, and it is mainly in order to illustrate embodiment, and the associated description of specification can be coordinated to explain the operation principles of embodiment.Coordinate with reference to these contents, those of ordinary skill in the art will be understood that other possible execution modes and advantage of the present utility model.Assembly in figure not drawn on scale, and similar element numbers is commonly used to assembly like representation class.
Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.
Consult shown in Fig. 1, the utility model preferably the LLC resonant converter of an embodiment isolation feedback power supply circuits, it comprises: switching network 100, resonant network 200, isolating transformer 300, current rectifying and wave filtering circuit 400, power supply circuits 500 and voltage feedback circuit 600.Wherein, resonant network 200 one end is connected with switching network 100, and the other end is connected to the former limit winding of 300 isolating transformers.The vice-side winding of isolating transformer 300 comprises the first vice-side winding and the second vice-side winding, and the first vice-side winding is connected with the input of current rectifying and wave filtering circuit 400.The input of power supply circuits 500 is connected to the second vice-side winding of isolating transformer 300, and the output of power supply circuits 500 is connected with the power end of voltage feedback circuit 600, and the input of voltage feedback circuit 600 is in parallel with the output of current rectifying and wave filtering circuit 400.
The switching network 100 of this embodiment comprises switching tube Q1, lower switching tube Q2.The positive pole Vin+ of input termination Active PFC (PowerFactorCorrection is called for short PFC) the circuit output of upper switching tube Q1, the input of switching tube Q2 under the output termination of upper switching tube Q1, and the output head grounding Vin-of lower switching tube Q2.
Resonant network 200 is made up of resonant capacitance C1 and resonance inductance L 1.Between the tie point that resonant capacitance C1 is connected on switching tube Q1 output and lower switching tube Q2 input and resonance inductance L 1, resonant inductance L1 mono-termination resonant capacitance C1 one end, another termination isolating transformer 300 former limit Motor Winding Same Name of Ends, isolating transformer 300 different name end is connected with the output of the lower switching tube Q2 of switching network 100.
Current rectifying and wave filtering circuit 400 comprises the first rectifier bridge and filter capacitor C2, and the first vice-side winding of isolating transformer 300 is connected with the first rectifier bridge.First rectifier bridge comprises diode D1, D2, D3 and D4, and four diodes of the first rectifier bridge of this embodiment form full-bridge circuit.First rectifier bridge is in parallel with filter capacitor C2, and the positive pole of filter capacitor C2 is connected to output head anode Vout+, and negative pole is connected to negative pole of output end Vout-.
Second vice-side winding of isolating transformer 300 is connected with power supply circuits 500.Power supply circuits 500 comprise the second rectifier bridge, filter capacitor C3 and current-limiting resistance R2, and wherein, the second rectifier bridge comprises four diodes D5, D6, D7 and D8, and these four diodes form full-bridge circuit.Second rectifier bridge is in parallel with filter capacitor C3, and current-limiting resistance R2 one end is connected to the positive pole of filter capacitor C3, and the other end is connected to voltage feedback circuit 600.
Voltage feedback circuit 600 comprises photoelectrical coupler U1, three-terminal voltage regulator U2, resistance R1, resistance R3 and resistance R4.The positive pole of photoelectrical coupler U1 input is connected with the current-limiting resistance R2 of power supply circuits 500, and current rectifying and wave filtering circuit 400 exports the negative pole being connected to photoelectrical coupler U1 input through voltage stabilizing circuit.Voltage stabilizing circuit comprises three-terminal voltage regulator device U2 and bleeder circuit, bleeder circuit is in series by resistance R1, R3, R4, the output of current rectifying and wave filtering circuit 400 connects bleeder circuit, and the dividing potential drop output of this bleeder circuit is connected to the adjustable side R of three-terminal voltage regulator U2.
It should be noted that, the three-terminal voltage regulator of this embodiment is the pressurizer of TL341 model.First rectifier bridge of this embodiment is or/and the second rectifier bridge is full-bridge circuit, and those skilled in the art is known, and the first rectifier bridge is or/and the second rectifier bridge also can be half-bridge circuit.
This embodiment increases second group of vice-side winding and the second current rectifying and wave filtering circuit, the second vice-side winding number of turn selects the suitable turn ratio to obtain suitable low-tension supply according to High voltage output value in proportion, power supply is to pressurizer TL431, magnitude of voltage can provide pressurizer TL431 running current with satisfied, the power supply of such low-voltage can reduce the excess loss of system, also need not use other DC/DC insulating power supply module, save cost.
Although specifically show in conjunction with preferred embodiment and describe the utility model; but those skilled in the art should be understood that; not departing from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection range of the present utility model.

Claims (8)

1. the isolation feedback power supply circuits of a LLC resonant converter, it is characterized in that, it comprises: switching network, resonant network, isolating transformer, current rectifying and wave filtering circuit, power supply circuits and voltage feedback circuit, described resonant network one end is connected with switching network, and the other end is connected to the former limit winding of isolating transformer; The vice-side winding of described isolating transformer comprises the first vice-side winding and the second vice-side winding, and described first vice-side winding is connected with the input of current rectifying and wave filtering circuit; The input of described power supply circuits is connected to the second vice-side winding of isolating transformer, and the output of power supply circuits is connected with the power end of voltage feedback circuit; The input of described voltage feedback circuit is in parallel with the output of current rectifying and wave filtering circuit.
2. isolation feedback power supply circuits as claimed in claim 1, it is characterized in that: described Voltage Feedback control circuit comprises: photoelectrical coupler and source of stable pressure circuit, the output of power supply circuits is connected to the positive pole of photoelectrical coupler input, and current rectifying and wave filtering circuit exports the negative pole being connected to photoelectrical coupler input after voltage stabilizing circuit.
3. isolation feedback power supply circuits as claimed in claim 2, it is characterized in that: described voltage stabilizing circuit comprises a three-terminal voltage regulator and a bleeder circuit, current rectifying and wave filtering circuit exports and connects bleeder circuit, and the dividing potential drop output of this bleeder circuit is connected to the adjustable side of this three-terminal voltage regulator.
4. isolation feedback power supply circuits as claimed in claim 3, is characterized in that: described three-terminal voltage regulator is the pressurizer of TL341 model.
5. isolation feedback power supply circuits as claimed in claim 1, is characterized in that: described power supply circuits comprise the second rectifier bridge, the 3rd electric capacity and the second resistance, after the second rectifier bridge and the 3rd Capacitance parallel connection, then with the second resistant series.
6. isolation feedback power supply circuits as claimed in claim 5, is characterized in that: described second rectifier bridge is full-bridge circuit or half-bridge circuit.
7. isolation feedback power supply circuits as claimed in claim 1, is characterized in that: described current rectifying and wave filtering circuit comprises the first rectifier bridge and the second electric capacity, the first rectifier bridge and the second Capacitance parallel connection.
8. isolation feedback power supply circuits as claimed in claim 7, is characterized in that: described first rectifier bridge is full-bridge circuit or half-bridge circuit.
CN201520515541.8U 2015-07-16 2015-07-16 Isolation feedback supply circuit of LLC resonant transformation ware Active CN204858973U (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451364A (en) * 2016-06-29 2017-02-22 江苏镇安电力设备有限公司 Over-current protection circuit for full-bridge LLC resonance converter
CN107968575A (en) * 2017-12-25 2018-04-27 广州金升阳科技有限公司 A kind of feedback control circuit
CN111555623A (en) * 2020-04-24 2020-08-18 深圳航天科技创新研究院 Power converter and power system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106451364A (en) * 2016-06-29 2017-02-22 江苏镇安电力设备有限公司 Over-current protection circuit for full-bridge LLC resonance converter
CN107968575A (en) * 2017-12-25 2018-04-27 广州金升阳科技有限公司 A kind of feedback control circuit
CN111555623A (en) * 2020-04-24 2020-08-18 深圳航天科技创新研究院 Power converter and power system
CN111555623B (en) * 2020-04-24 2021-08-03 深圳航天科技创新研究院 Power converter and power system

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