CN107947589A - A kind of plus auxiliary circuit full-bridge LLC resonant converter - Google Patents
A kind of plus auxiliary circuit full-bridge LLC resonant converter Download PDFInfo
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- CN107947589A CN107947589A CN201711287200.XA CN201711287200A CN107947589A CN 107947589 A CN107947589 A CN 107947589A CN 201711287200 A CN201711287200 A CN 201711287200A CN 107947589 A CN107947589 A CN 107947589A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
- H02M7/4818—Resonant converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of plus auxiliary circuit full-bridge LLC resonant converter, including on-off circuit, resonant network, transformer TR, rectifying and wave-filtering network and auxiliary circuit.Resonant network includes series resonant capacitance Cr1, series resonance inductor Lr, parallel resonant inductor Lr.Rectifying and wave-filtering network is circuit of synchronous rectification, has the advantages that efficient, stability is good；Auxiliary circuit includes switching tube, body diode, parasitic capacitance and auxiliary capacitor Cr2 in parallel.The present invention can realize the no-voltage conducting of full-bridge (FB) arm on the basis of control circuit complexity is not increased, and reduce the circulation loss of circuit by auxiliary circuit, further improve the efficiency of circuit.And, in to the very high application environment for not allowing for input voltage concussion occur of power requirements, (hold up time) it can ensure output normal work within the effective time of input voltage bust or power-off, so as to not influence the working status of overall system.
Description
Technical field
The invention belongs to switching manipulation field of power supplies, is related to a kind of full-bridge LLC converters, especially a kind of plus auxiliary circuit
Full-bridge LLC resonant converter.
Background technology
Energy conversion efficiency is always hot spot of concern, and wherein power conversion apparatus is changed as power industry efficiency
One representative, be widely used in such as the various aspects such as Switching Power Supply, distributed generation resource, uninterrupted power source, traditional power
Switching device work in mostly hard switching state with switching loss it is big, voltage stress is big, and power density is low, and EMI is big, conversion effect
The low problems of rate, and LLC resonant converter then can well weaken or solve the problems, such as these.
LLC resonant converter works in Sofe Switch state, reduces switching loss, improves transducer effciency, is that converter is high
Frequencyization provides possibility, further reduces the volume and weight of converter, improves the power density and dynamic property of converter,
Improve electromagnetic compatibility at the same time.
In addition, in addition to power quality and efficiency are always focus, modern society is to the electrical stability of power supply, especially
It is that this place that must assure that steady operation, even more pays attention in again for precision instrument and large data center etc..
The content of the invention
The shortcomings that it is an object of the invention to overcome the above-mentioned prior art, there is provided one kind is under the circuit input voltage short time
Drop or efficient, steady operation plus auxiliary circuit full-bridge LLC resonant converter can be continued in the case of breaking.
To reach above-mentioned purpose, the present invention is achieved by the following scheme：
A kind of plus auxiliary circuit full-bridge LLC resonant converter, it is characterised in that including DC power supply V1, full-bridge
LLC translation circuits and auxiliary circuit；Full-bridge circuit includes on-off circuit, resonant network, transformer TR and output rectification
Filter circuit；The input termination direct current of on-off circuit is total to power supply V1, and output terminal is connected to transformer TR by resonant network
Primary side winding on, the vice-side winding of the input termination transformer TR of output rectifier and filter, output terminal is full-bridge LLC resonance
The output terminal of converter；Auxiliary circuit is connected by resonant network with the primary side winding of transformer TR.
Further improve of the invention is：
On-off circuit includes four switch metal-oxide-semiconductors, and each metal-oxide-semiconductor that switchs is parallel with body diode and parasitic capacitance；Its
In, the drain electrode of switch metal-oxide-semiconductor Q1 and the source electrode of switch metal-oxide-semiconductor Q2 are connected with DC power supply, the source electrode and switch of switch metal-oxide-semiconductor Q1
The drain electrode of metal-oxide-semiconductor Q2 is connected, the source electrode ground connection of switch metal-oxide-semiconductor Q2, the drain electrode of switch metal-oxide-semiconductor Q3 and the source electrode of switch metal-oxide-semiconductor Q4
It is connected with DC power supply.
The source electrode of switch metal-oxide-semiconductor Q1 connects the cathode of DC power supply V1, and the drain electrode of switch metal-oxide-semiconductor Q2 connects direct current supply electricity
The anode of source V1.
Resonant network includes main resonance groove and auxiliary resonant net；Main resonance groove includes resonant inductance Lr, excitation electricity
Feel Lm and resonant capacitance Cr1；Auxiliary resonant net includes resonant inductance Lr, resonant capacitance Cr1, magnetizing inductance Lm and auxiliary capacitor
Cr2；Wherein, one end of resonant inductance Lr is connected to switch metal-oxide-semiconductor Q1 and switchs on node between metal-oxide-semiconductor Q2, the other end according to
Secondary series excitation inductance Lm and resonant capacitance Cr1, magnetizing inductance Lm are connected in parallel on the primary side winding both ends of transformer TR, resonant capacitance
The other end of Cr1 is connected on the node between switch metal-oxide-semiconductor Q3 and switch metal-oxide-semiconductor Q4.
Auxiliary circuit include auxiliary switch Qf, be connected in parallel on auxiliary switch Qf drain electrode and the body diode Df on source electrode and
Parasitic capacitance Cf；After the drain electrode concatenation auxiliary capacitor Cr2 of auxiliary switch Qf, resonant capacitance Cr1 both ends are connected in parallel on.
Output rectifier and filter includes four rectification metal-oxide-semiconductors, and each rectification metal-oxide-semiconductor is parallel with body diode and parasitism
Capacitance；Wherein, transformer TR vice-side windings are connected with the drain electrode of rectification metal-oxide-semiconductor SR1 and the source electrode of rectification metal-oxide-semiconductor SR2, rectification
The drain electrode of the source electrode of metal-oxide-semiconductor SR1 and rectification metal-oxide-semiconductor SR2 is connected, the drain electrode of rectification metal-oxide-semiconductor SR3 and the source electrode of rectification metal-oxide-semiconductor SR4
It is connected with transformer TR vice-side windings, filter capacitor Co and output loading R are connected in parallel on the source electrode and rectification MOS of rectification metal-oxide-semiconductor SR3
Between the drain electrode of pipe SR4.
Compared with prior art, the invention has the advantages that：
Present invention addition auxiliary circuit, in favor of realizing transformation efficiency height, the application that power quality is stablized is defeated in converter
When entering power down or bust, regulated output voltage, continues to keep efficient transformation of electrical energy, protects accurate electrical equipment.The present invention
Increase auxiliary circuit, auxiliary circuit does not have main circuit any influence during normal operation, main only within the hold-up times
The voltage die of circuit original edge voltage device or fluctuation, when can not meet output needs, auxiliary circuit is at this time by increasing resonance electricity
The value for holding Cr1 improves gain to secondary offer energy, keeps output terminal meet demand.The structure of full-bridge LLC of the present invention, Ke Yicheng
The Zero voltage transition Sofe Switch of all switch metal-oxide-semiconductors of code insurance card.Auxiliary circuit of the present invention is a capacitance and a switching tube group
Into, it is only necessary to simple control circuit, the control circuit and main control circuit are separate, do not increase the complexity of main control circuit
Degree.
Brief description of the drawings
Fig. 1 is full-bridge LLC resonant converter circuit topological structure；
Fig. 2 a are the oscillograms of circuit work；LLC resonance currents and excitation current waveform when b is hold-up；
Fig. 3 is normal output and hold-up output waveforms.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Referring to Fig. 1, DC power supply V1, full-bridge LLC translation circuits and an auxiliary circuit of the present invention；Full-bridge conversion electricity
The input terminal on road and the output terminal for being connected to DC power supply V1.Full-bridge circuit includes on-off circuit, resonant network, transformation
Device TR, output rectifier and filter.Rectification circuit and on-off circuit are full bridge structure.The direct-flow input end of on-off circuit is humorous
Shake the direct-flow input end in circuit；The output terminal of the input termination switch circuit of resonance circuit, output termination transformer TR primary sides around
Group.Transformer TR is coupled with output rectification circuit by transformer TR.Output rectifier and filter is full-wave rectification.
Resonant network is divided into main resonance groove and auxiliary resonant net：Main resonance groove includes resonant inductance Lr, excitation electricity
Feel Lm and resonant capacitance Cr1；Auxiliary resonant net includes resonant inductance Lr, resonant capacitance Cr1, magnetizing inductance Lm and auxiliary capacitor
Cr2；Resonant network includes resonant capacitance Cr1, resonant inductance Lr and the magnetizing inductance Lm being sequentially connected in series；Resonant capacitance Cr1, resonance
Both ends after inductance Lr connects with magnetizing inductance Lm meet two output terminals of on-off circuit, resonant inductance Lr and transformer TR respectively
Primary side winding is in parallel.Series resonance inductor Lr is the leakage inductance of transformer TR primary sides, and parallel resonant inductor Lr is encouraging for transformer TR
Magnetoelectricity sense Lm.
The present invention with the addition of auxiliary circuit on LLC circuits, and the capacitance of auxiliary circuit is opened with resonant capacitance Cr1 by auxiliary
Close pipe Qf and carry out parallel connection, then form new resonant network together with resonant inductance Lr, magnetizing inductance Lm, protection circuit exists
Hold-up times interior energy keeps stable output, the normal work without influencing electricity consumption establishing.
Auxiliary circuit includes auxiliary switch Qf, body diode Df, parasitic capacitance Cf and auxiliary capacitor Cr2, auxiliary capacitor
Cr2 and auxiliary switch Qf connect, then in parallel with resonant capacitance Cr1 progress again.This auxiliary circuit and full-bridge conversion electricity
Resonant inductance Lr, resonant capacitance Cr1, transformer TR in road collectively constitute an auxiliary resonant net, lead in parameter designing
The circulation loss of circuit can be reduced by crossing auxiliary circuit, further improve the efficiency of circuit.During normal work, this auxiliary circuit is to master
Circuit does not have any influence, once converter input voltage bust or break, this circuit by increasing the value of resonant capacitance Cr1,
Voltage gain is improved, and energy is transmitted to secondary so that the overall normal output of converter.
On-off circuit includes switch metal-oxide-semiconductor Q1, the body diode D1 of switch metal-oxide-semiconductor Q1, parasitic capacitance C1, switch metal-oxide-semiconductor
Q2, the body diode D2 of switch metal-oxide-semiconductor Q2, parasitic capacitance C2, switch metal-oxide-semiconductor Q3, switch metal-oxide-semiconductor Q3 body diode D3, post
Raw capacitance C3, switch metal-oxide-semiconductor Q4, the body diode D4 and parasitic capacitance C4 of switch metal-oxide-semiconductor Q4；Specifically, switch metal-oxide-semiconductor Q1
The source electrode of drain electrode and switch metal-oxide-semiconductor Q2 are connected with DC power supply, the source electrode of switch metal-oxide-semiconductor Q1 and the drain electrode phase of switch metal-oxide-semiconductor Q2
Even, the source electrode ground connection of switch metal-oxide-semiconductor Q2, the drain electrode of switch metal-oxide-semiconductor Q3 and the source electrode of switch metal-oxide-semiconductor Q4 are connected with DC power supply；
Output rectifier and filter include rectification metal-oxide-semiconductor SR1, the body diode D5 of rectification metal-oxide-semiconductor SR1, parasitic capacitance C5,
Rectification metal-oxide-semiconductor SR2, the body diode D6 of rectification metal-oxide-semiconductor SR2, parasitic capacitance C6, rectification metal-oxide-semiconductor SR3, rectification metal-oxide-semiconductor SR3
Body diode D7, parasitic capacitance C7, rectification metal-oxide-semiconductor SR4, the body diode D8 of rectification metal-oxide-semiconductor SR4, parasitic capacitance C8, filtered electrical
Hold Co and output resistance R；Specifically, transformer TR vice-side windings and the drain electrode of rectification metal-oxide-semiconductor SR1 and the source of rectification metal-oxide-semiconductor SR2
Extremely it is connected, the drain electrode of the source electrode and rectification metal-oxide-semiconductor SR2 of rectification metal-oxide-semiconductor SR1 is connected, the drain electrode of rectification metal-oxide-semiconductor SR3 and rectification MOS
The source electrode of pipe SR4 is connected with transformer TR vice-side windings, parallel filtering capacitance Co, output loading R；
Fig. 2 a are circuit waveform figure of the present invention in normal work；Fig. 2 b are the circuit waveform figures of hold-up times.
The present invention increases auxiliary circuit, and auxiliary circuit does not have main circuit any influence during normal operation, only exists
The voltage die of main circuit original edge voltage device or fluctuation in the hold-up times, when can not meet output needs, auxiliary circuit is at this time
Value by increasing resonant capacitance Cr1 improves gain and provides energy to secondary, keeps output terminal meet demand.Full-bridge of the present invention
The structure of LLC, can ensure the Zero voltage transition Sofe Switch of all switch metal-oxide-semiconductors with component.The complete cycle of the present invention
It is made of different subintervals and corresponding different mode, the course of work under normal circumstances is analyzed below：
In Mode1 [t0-t1] stages, at the t0 moment, switch metal-oxide-semiconductor Q2, switch metal-oxide-semiconductor Q3 switching tubes are conducting state, humorous
Electric current ip directions shake for just, and flows through switch metal-oxide-semiconductor Q2, switch metal-oxide-semiconductor Q3 Switch main bodies.Synchronous rectification rectification under this mode
Metal-oxide-semiconductor SR1, rectification metal-oxide-semiconductor SR4 are held on, and magnetizing inductance Lm both ends are by transformer TR pair terminal voltage clampers, exciting current
ILm change rates is just, resonant slots are made of resonant inductance Lr, resonant capacitance Cr1.
Mode2 [t1-t2] stages, t1 moment magnetizing inductances Lm still by transformer TR pair terminal voltage clampers, resonant slots by
Resonant inductance Lr, resonant capacitance Cr1 are formed, circuit resonant frequencies fr1.Under the action of transformer TR negative terminal voltages, excitation
Electric current iLm directions are changed into positive direction.It is equal with exciting current iLm in t2 moment ip, secondary side rectification metal-oxide-semiconductor SR1, rectification MOS
Pipe SR4 stops conducting, and load energy is provided by electric capacity of voltage regulation.Clamping action of the reflected voltage of output voltage to magnetizing inductance Lm
Disappear, magnetizing inductance Lm is initially added into resonance, and resonant slots are made of magnetizing inductance Lm, resonant inductance Lr, resonant capacitance Cr1.
In Mode3 [t2-t3] stages, in this mode, circuit enters dead time, and the output capacitance of all inverse switches exists
Electric discharge is started to charge up under the action of ip, after, resonant slots input voltage is reverse, but driving voltage does not rise to high level also, and
Ip directions are still that just, the commutation of transformer TR pairs end electric current, hereafter resonance current passes through rectification metal-oxide-semiconductor SR2, rectification metal-oxide-semiconductor SR3
Begin to turn on, magnetizing inductance Lm exits resonant slots, while exciting current iLm change rates are by transformer TR pair terminal voltage clampers
Negative, the electric current for flowing through body diode starts slowly to be risen by zero.Resonance current is reduced by sinusoidal rule and is less than magnetizing inductance
Lm electric currents.
The mode of half of switch periods is consistent with preceding half of switch periods mode afterwards, no longer analyzes here.
If input voltage fluctuation (power down etc.) occurs in course of normal operation, LLC resonant tanks are likely to occur Fig. 2 b
Shown phenomenon, at this moment auxiliary circuit can be next effectively to maintain instantaneous stability to output offer short-time energy.
The control loop of the present invention includes sample circuit, and (microcontroller, DSP, FPGA etc. are to feeding back to oneself for control processor
Signal handled), drive circuit, using control methods adjust duty cycle driving switch circuit give switching tube signal.
The present invention, which has, accurately completes switching tube Sofe Switch, and auxiliary circuit control and main circuit control are separate, energy
On the basis of main control loop complexity is not increased, the unstable situation of instantaneous input voltage is effectively eliminated, ensures rear class
The normal work of electrical equipment.Auxiliary circuit of the present invention is a capacitance and a switching tube composition, it is only necessary to simple control
Circuit, the control circuit and main control circuit are separate, do not increase the complexity of main control circuit.
Above content is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every to press
According to technological thought proposed by the present invention, any change done on the basis of technical solution, each falls within claims of the present invention
Protection domain within.
Claims (6)
1. a kind of plus auxiliary circuit full-bridge LLC resonant converter, it is characterised in that including DC power supply V1, full-bridge LLC
Translation circuit and auxiliary circuit；Full-bridge circuit includes on-off circuit, resonant network, transformer TR and output rectification filter
Circuit；The input termination direct current of on-off circuit is total to power supply V1, and output terminal is connected to the original of transformer TR by resonant network
On the winding of side, the vice-side winding of the input termination transformer TR of output rectifier and filter, output terminal is full-bridge LLC resonant transformations
The output terminal of device；Auxiliary circuit is connected by resonant network with the primary side winding of transformer TR.
2. according to claim 1 plus auxiliary circuit full-bridge LLC resonant converter, it is characterised in that on-off circuit bag
Four switch metal-oxide-semiconductors are included, each metal-oxide-semiconductor that switchs is parallel with body diode and parasitic capacitance；Wherein, the leakage of metal-oxide-semiconductor Q1 is switched
The source electrode of pole and switch metal-oxide-semiconductor Q2 are connected with DC power supply, and the drain electrode of the source electrode and switch metal-oxide-semiconductor Q2 of switch metal-oxide-semiconductor Q1 is connected,
The source electrode ground connection of metal-oxide-semiconductor Q2 is switched, the drain electrode of switch metal-oxide-semiconductor Q3 and the source electrode of switch metal-oxide-semiconductor Q4 are connected with DC power supply.
3. according to claim 2 plus auxiliary circuit full-bridge LLC resonant converter, it is characterised in that switch metal-oxide-semiconductor Q1
Source electrode connect the cathode of DC power supply V1, the drain electrode of switch metal-oxide-semiconductor Q2 connects the anode of DC power supply V1.
4. according to claim 2 plus auxiliary circuit full-bridge LLC resonant converter, it is characterised in that resonant network bag
Include main resonance groove and auxiliary resonant net；Main resonance groove includes resonant inductance Lr, magnetizing inductance Lm and resonant capacitance Cr1；
Auxiliary resonant net includes resonant inductance Lr, resonant capacitance Cr1, magnetizing inductance Lm and auxiliary capacitor Cr2；Wherein, resonant inductance
One end of Lr is connected to switch metal-oxide-semiconductor Q1 and switchs on node between metal-oxide-semiconductor Q2, the other end be sequentially connected in series magnetizing inductance Lm and
Resonant capacitance Cr1, magnetizing inductance Lm are connected in parallel on the primary side winding both ends of transformer TR, and the other end of resonant capacitance Cr1 is connected to
Switch on the node between metal-oxide-semiconductor Q3 and switch metal-oxide-semiconductor Q4.
5. according to claim 4 plus auxiliary circuit full-bridge LLC resonant converter, it is characterised in that auxiliary circuit bag
Include auxiliary switch Qf, be connected in parallel on auxiliary switch Qf drain electrodes and body diode Df and parasitic capacitance Cf on source electrode；Auxiliary is opened
After the drain electrode concatenation auxiliary capacitor Cr2 for closing pipe Qf, resonant capacitance Cr1 both ends are connected in parallel on.
6. according to claim 1 plus auxiliary circuit full-bridge LLC resonant converter, it is characterised in that output rectification filter
Wave circuit includes four rectification metal-oxide-semiconductors, and each rectification metal-oxide-semiconductor is parallel with body diode and parasitic capacitance；Wherein, transformer TR
Vice-side winding is connected with the drain electrode of rectification metal-oxide-semiconductor SR1 and the source electrode of rectification metal-oxide-semiconductor SR2, the source electrode of rectification metal-oxide-semiconductor SR1 and rectification
The drain electrode of metal-oxide-semiconductor SR2 is connected, the drain electrode of rectification metal-oxide-semiconductor SR3 and the source electrode of rectification metal-oxide-semiconductor SR4 and transformer TR vice-side winding phases
Even, filter capacitor Co and output loading R are connected in parallel between the drain electrode of source electrode and rectification metal-oxide-semiconductor SR4 of rectification metal-oxide-semiconductor SR3.
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| CN201711287200.XA CN107947589A (en) | 2017-12-07 | 2017-12-07 | A kind of plus auxiliary circuit full-bridge LLC resonant converter |
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| CN201711287200.XA CN107947589A (en) | 2017-12-07 | 2017-12-07 | A kind of plus auxiliary circuit full-bridge LLC resonant converter |
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| CN109302078A (en) * | 2018-11-23 | 2019-02-01 | 三峡大学 | DC-DC Switching Power Supply based on synchronous rectification mode |
| CN109698627A (en) * | 2018-12-24 | 2019-04-30 | 东北大学 | A kind of full-bridge DC/DC converter and its modulation strategy based on switched capacitor |
| CN110224605A (en) * | 2019-05-07 | 2019-09-10 | 国电南瑞南京控制***有限公司 | A kind of full-bridge circuit |
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| CN114244132A (en) * | 2021-12-11 | 2022-03-25 | 深圳市普德新星电源技术有限公司 | Resonant half-bridge circuit for improving output holding time and switching power supply |
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| CN108631599A (en) * | 2018-05-18 | 2018-10-09 | 邵子腾 | A kind of message blind controller system |
| CN109302078A (en) * | 2018-11-23 | 2019-02-01 | 三峡大学 | DC-DC Switching Power Supply based on synchronous rectification mode |
| CN109302078B (en) * | 2018-11-23 | 2024-05-28 | 三峡大学 | DC-DC switching power supply based on synchronous rectification mode |
| CN109698627A (en) * | 2018-12-24 | 2019-04-30 | 东北大学 | A kind of full-bridge DC/DC converter and its modulation strategy based on switched capacitor |
| CN110224605A (en) * | 2019-05-07 | 2019-09-10 | 国电南瑞南京控制***有限公司 | A kind of full-bridge circuit |
| CN111817569A (en) * | 2020-06-30 | 2020-10-23 | 天津大学 | Isolated soft switch LLC-SC direct current converter with self-adaptive resonant cavity adjustment |
| CN112688569A (en) * | 2020-12-21 | 2021-04-20 | 华南理工大学 | PO mode enhanced CLLC resonant bidirectional DC/DC converter topology |
| CN112688569B (en) * | 2020-12-21 | 2021-11-23 | 华南理工大学 | PO mode enhanced CLLC resonant bidirectional DC/DC converter topology |
| CN113746342A (en) * | 2021-08-27 | 2021-12-03 | 西安交通大学 | LLC full-bridge converter main circuit with automatic overcurrent protection function and control method |
| CN113746342B (en) * | 2021-08-27 | 2023-03-28 | 西安交通大学 | LLC full-bridge converter main circuit with automatic overcurrent protection function and control method |
| CN114244132A (en) * | 2021-12-11 | 2022-03-25 | 深圳市普德新星电源技术有限公司 | Resonant half-bridge circuit for improving output holding time and switching power supply |
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