CN108964474A - A kind of three mode rectification topologies based on LLC resonant converter - Google Patents

A kind of three mode rectification topologies based on LLC resonant converter Download PDF

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Publication number
CN108964474A
CN108964474A CN201810918522.8A CN201810918522A CN108964474A CN 108964474 A CN108964474 A CN 108964474A CN 201810918522 A CN201810918522 A CN 201810918522A CN 108964474 A CN108964474 A CN 108964474A
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mode
bridge
oxide
metal
semiconductor
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CN108964474B (en
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马辉
赵金刚
冯茂
刘昊邦
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/33569Conversion 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
    • H02M3/33576Conversion 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
    • H02M3/33592Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/14Arrangements for reducing ripples from dc input or output
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

A kind of three mode rectification topologies based on LLC resonant converter, transformer primary side includes the full bridge structure and LLC resonant converter of 4 MOSFET compositions, converter includes resonant inductance, resonant capacitance and static exciter inductance, in the case where not using high-frequency drive, input and outlet side realize half-bridge while underloading is with heavy duty mutually conversion, full-bridge, load is detached from the mutual conversion of (zero load) with transformer, without using high-frequency drive, reduce voltage ripple, busbar voltage is controlled in full-load range, achieve the purpose that electric current flows using electric current Dead band controller.Circuit Fault on Secondary Transformer is using a kind of 3 mode adjustable apparatus, Circuit Fault on Secondary Transformer switches heavily loaded mode (full-bridge), light-load mode (half-bridge) and idle mode using PWM controller, full-bridge rectification structure is used when overloaded, Half bridge rectifier structure is used at light load, realizes that the purpose of synchronous rectification transfer efficiency is once completed, greatly improved in heavy duty to underloading smooth transition, output voltage ripple minimum, synchronism switching.

Description

A kind of three mode rectification topologies based on LLC resonant converter
Technical field
A kind of three mode rectification topologies based on LLC resonant converter of the present invention, are related to field of conversion of electrical energy.
Background technique
LLC converter is used widely in Switching Power Supply because of its exclusive topological property, relative to traditional power frequency Transformer mitigates weight, reduces volume, reduces cost, while improving power quality.Harmonic technology is excellent as realization Sofe Switch Change method, by the common concern of people, resonant network is its basic transformation unit, when resonance occurs, electric current in circuit or Voltage cycle is reduced to zero, so that switching tube on or off in the case where zero current or no-voltage, reduces switching loss, Achieve the purpose that Sofe Switch.
Preferably synchronous rectifier should realize the same electric function of diode rectifier and reduce conduction loss, due to MOSFET opens rear bi directional conductibility, is different from diode, therefore needs to be precisely controlled gate signal, ideally there is forward current When (drain electrode of source electrode flow direction), MOSFET conducting avoids work improper and impacts to circuit work.
Because LLC circuit is current mode output circuit, output only has filter capacitor Circuit Fault on Secondary Transformer winding voltage and is exported Voltage clamping, therefore polarity of voltage variation is realized in synchronous rectifier, cannot can only use electric current using voltage-controlled type from driving Detection is realized, therefore referred to as current control driving method.However, LLC resonant converter, there is also disadvantage, voltage increases in the case of underloading Benefit can exceed prescribed limit, and conventional method solves this problem using the method for improving switching tube working frequency, and frequency is significantly Increase causes ZVS to lose while output voltage ripple being caused to increase, and reduces efficiency, and battery interference increases.
Under idle condition, LLC is influenced by parasitic parameter, and gain curve upwarps, output voltage increases, not easy to control, is This problem is solved, by the way of determining frequency control, but the method can cause LLC efficiency to decline, and generally use burst mould Formula improves efficiency.Output voltage is increased to limit value, the control signal of on-off switching tube, and converter enters idle mode, output Voltage decline, when output voltage drops to limit value, the control signal of switching tube is normally provided, and converter operates normally, electricity Pressure increases, in cycles.Consequence caused by the method is that output voltage ripple is excessive, causes biggish electromagnetic interference, is unfavorable for System stable operation.It is limited by relatively narrow bandwidth, LLC dynamic responding speed is slower, need to propose that new type of control method is covered the shortage.
Summary of the invention
The technical problem to be solved by the present invention is to improve for existing full-bridge/Half bridge rectifier technology, propose a kind of base In three mode rectification topologies of LLC controlled resonant converter, in the case where not using high-frequency drive, input side realizes underloading With heavily loaded mutually conversion, outlet side realizes heavy duty, underloading, unloaded mutually conversion.So as to reduce output voltage ripple, make system Stable operation.
The technical scheme adopted by the invention is as follows:
A kind of three mode rectification topologies based on LLC resonant converter, comprising:
Become positioned at 4 metal-oxide-semiconductors Q1, Q2, Q3, Q4 of transformer T0 primary side full bridge structure formed and LLC resonance Parallel operation, the LLC resonant converter include resonant inductance Lr, resonant capacitance Cr, static exciter inductance Lm
Rectifier can be switched positioned at 3 mode of transformer T0 secondary side, 3 mode can be switched rectifier and open including 4 Close pipe S1, S2, S3, S4 and a piece external capacitive body CO
Signal input part Uin+ pole is separately connected the drain electrode of the drain electrode of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q3, the source electrode of metal-oxide-semiconductor Q1 connects The drain electrode of metal-oxide-semiconductor Q2 is connect, the source electrode of metal-oxide-semiconductor Q3 connects the drain electrode of metal-oxide-semiconductor Q4, and source electrode, the source electrode of metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q2 is equal Connection signal input terminal Uin- pole;The source electrode of metal-oxide-semiconductor Q1 connects resonant capacitance CrOne end, resonant capacitance CrOther end connection becomes Depressor magnetizing inductance LmOne end, static exciter inductance LmThe drain electrode of other end connection metal-oxide-semiconductor Q4;
The source electrode of the drain electrode connection switch pipe S2 of switching tube S1, the drain electrode of the drain electrode connection switch pipe S4 of switching tube S2, is opened Close the drain electrode of the source electrode connection switch pipe S3 of pipe S4, the source electrode of the source electrode connection switch pipe S1 of switching tube S3;
The drain electrode of switching tube S1, the source electrode of switching tube S4 are separately connected the both ends of transformer T0 secondary side;
The drain electrode of the source electrode, switching tube S4 of switching tube S3 is separately connected piece external capacitive body COBoth ends.
A kind of three mode method for rectifying based on LLC resonant converter, topological structure input side, with reference to legacy frequencies control System adjusts transformer T0 primary side side metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4 control signal, and LLC resonant converter is in case of heavy load Under, switching tube is all controlled using traditional frequency;When LLC resonant converter is in underloading situation, the switch of left side bridge arm Pipe control mode is constant, and metal-oxide-semiconductor Q3 control signal sets 0, turns off metal-oxide-semiconductor Q3, and metal-oxide-semiconductor Q4 control signal sets 1, opens metal-oxide-semiconductor Q4, Complete conversion of the full-bridge of transformer T0 primary side side to half-bridge.
A kind of three mode method for rectifying based on LLC resonant converter, topological structure input side full-bridge/half-bridge conversion, are adopted Full-bridge half-bridge switching signal is generated with a kind of hystersis controller, control bus voltage in the case of full load is controlled using electric current dead zone Device processed achievees the purpose that electric current flows.
A kind of three mode method for rectifying based on LLC resonant converter, topological structure outlet side can using 3 mode of one kind Switch rectifier, be divided into heavily loaded mode, light-load mode and idle mode, it includes 4 switching tubes which, which can be switched rectifier, S1, S2, S3, S4 and a piece external capacitive body CO, heavy duty, underloading and the zero load of rectifier are adjusted using pulse width modulation (PWM) Mode.
A kind of three mode rectification topologies based on LLC resonant converter of the present invention, beneficial effect are: at light load, It is controlled according to legacy frequencies, the control signal of LLC transformer primary avris switching tube is adjusted, full-bridge is converted into half-bridge, The effect that control DC bus-bar voltage is realized before LLC gain curve upwarps appearance, is not improving switching tube working frequency On the basis of, achieve the purpose that stabilize the output voltage.Rectifier can be switched using a kind of three mode in Circuit Fault on Secondary Transformer, whole with tradition Flow and 4 synchronous rectifiers and a capacitor be used only unlike device, using pulse width modulating technology realize heavily loaded mode, The mutual conversion of light-load mode and idle mode reaches voltage ripple reduction, and transfer efficiency improves, and synchronism switching is one step completed Purpose.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is that half-bridge/full-bridge LLC resonant converter can be switched in 3 mode.
Fig. 2 (a) is LLC resonant converter input side driving signal schematic diagram one.
Fig. 2 (b) is LLC resonant converter input side driving signal schematic diagram two.
Fig. 3 (a) is that heavily loaded (1 mode) the operating condition schematic diagram of rectifier is adjusted in 3 mode.
Fig. 3 (b) is that rectifier underloading (2 mode) operating condition schematic diagram is adjusted in 3 mode.
Fig. 3 (c) is that unloaded (3 mode) the operating condition schematic diagram of rectifier is adjusted in 3 mode.
Fig. 4 is that rectifier control flow schematic diagram can be switched in 3 mode.
Fig. 5 is PWM controller schematic diagram.
Fig. 6 is PWM controller working principle.
Fig. 7 respectively indicates resonant inductance current waveform and static exciter inductive current waveform diagram.
Fig. 8 is multi-modal rectifier DC side output voltage waveform.
Fig. 9 is Circuit Fault on Secondary Transformer current waveform figure.
Output current wave figure when Figure 10 is rectifier full-bridge state.
Output current wave figure when Figure 11 is rectifier half-bridge state.
Specific embodiment
A kind of three mode rectification topologies based on LLC resonant converter, comprising:
Become positioned at 4 metal-oxide-semiconductors Q1, Q2, Q3, Q4 of transformer T0 primary side full bridge structure formed and LLC resonance Parallel operation, the LLC resonant converter include resonant inductance Lr, resonant capacitance Cr, static exciter inductance Lm
Rectifier can be switched positioned at 3 mode of transformer T0 secondary side, 3 mode can be switched rectifier and open including 4 Close pipe S1, S2, S3, S4 and a piece external capacitive body CO
Signal input part Uin+ pole is separately connected the drain electrode of the drain electrode of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q3, the source electrode of metal-oxide-semiconductor Q1 connects The drain electrode of metal-oxide-semiconductor Q2 is connect, the source electrode of metal-oxide-semiconductor Q3 connects the drain electrode of metal-oxide-semiconductor Q4, and source electrode, the source electrode of metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q2 is equal Connection signal input terminal Uin- pole;The source electrode of metal-oxide-semiconductor Q1 connects resonant capacitance CrOne end, resonant capacitance CrOther end connection becomes Depressor magnetizing inductance LmOne end, static exciter inductance LmThe drain electrode of other end connection metal-oxide-semiconductor Q4;The drain electrode of switching tube S1 connects The source electrode of switching tube S2, the drain electrode of the drain electrode connection switch pipe S4 of switching tube S2, the source electrode connection switch pipe S3's of switching tube S4 Drain electrode, the source electrode of the source electrode connection switch pipe S1 of switching tube S3;The drain electrode of switching tube S1, the source electrode of switching tube S4 are separately connected The both ends of transformer T0 secondary side;The drain electrode of the source electrode, switching tube S4 of switching tube S3 is separately connected piece external capacitive body COTwo End.
Above-mentioned topological structure input side is controlled with reference to legacy frequencies, to transformer primary avris metal-oxide-semiconductor Q3, Q4 of LLC Control signal is adjusted, and LLC resonant converter is under case of heavy load, and switching tube is all controlled using traditional frequency, when When LLC resonant converter is in underloading situation, the switch controlled mode of left side bridge arm is constant, and metal-oxide-semiconductor Q3 control signal sets 0, Metal-oxide-semiconductor Q3 is turned off, metal-oxide-semiconductor Q4 control signal sets 1, opens metal-oxide-semiconductor Q4, i.e. completion transformer primary avris full-bridge turns to half-bridge It changes.
Above topology structure input side full-bridge/half-bridge conversion generates full-bridge half-bridge switching letter using a kind of hystersis controller Number, control bus voltage in the case of full load achievees the purpose that electric current flows using electric current Dead band controller.
Above topology structure output side can be switched rectifier using a kind of 3 mode, be divided into heavily loaded mode (1 mode), underloading Mode (2 mode) and idle mode (3 mode) and traditional heavy duty (1 mode), idle mode (3 mode) have relatively big difference, institute Stating 3 mode and rectifier can be switched includes 4 switching tubes S1, S2, S3, S4 and a piece external capacitive body CO.Using pulse width tune Make heavy duty, underloading and idle mode that (PWM) adjusts rectifier.Output voltage ripple can be significantly reduced, switching loss is reduced, It improves efficiency.
Mode is divided into heavily loaded (1 mode), unloaded (3 mode) by traditional power regulation, as shown in Fig. 2 (a), Fig. 2 (b).
Rectifier is divided into heavily loaded mode (1 mode), light-load mode (2 mode), unloaded mould by three mode proposed by the present invention Formula (3 mode), full-bridge/half-bridge structure is rectified, and outlet side of short duration can work in idle mode, is adjusted using PWM controller Output voltage controls input current, and three mode rectifiers can periodically switch between heavily loaded (1 mode) underloading (2 mode), Include S1, S2, S3, S4 and piece external capacitive body C of transistor in four piecesO) as shown in Figure 1.
It is turned on and off by the gate drive signal realization of control switch pipe, the specific execution of PWM controller will be under It tells about in face.The present invention uses 3 mode rectifiers, and 2 mode (underloading) is increased between 1 mode (heavy duty) and 3 mode (zero load), Output voltage can be made to drop to minimum.Four equatioies are described below:
IO(1 mode)=Imax
IO(2 mode)=1/2Imax
IO(3 mode)=0
Imax=2Iac
I in above formulamaxFor maximum output current, IOTo export electric current, IacFor the alternating current of input.
Conventional rectifier output voltage ripple △ VDCIn 0 < Io<1/2ImaxShi Zeng great, in 1/2Imax<Io<ImaxWhen reduce, In 0 < I in three mode rectifierso<1/4Imax、1/2Imax<Io<3/4ImaxStage increases, in 1/4Imax<Io<1/2Imax、3/4Imax <Io<ImaxStage reduces, and output voltage ripple can be made to be substantially reduced by switching heavy duty, underloading, idle mode, while realized whole Flow synchronism switching.
The schematic diagram and working principle of PWM controller distinguish as shown in Figure 5 and Figure 6, PWM controller inductive output voltage VDC, and it is compared with reference voltage, stablize system using fast transient response, 3 mode rectifiers automatically switch weight Load/underloading: compensation output voltage VEACompared with two sawtooth signals Ramp1, Ramp2, two signals amplitude having the same And frequency, as shown in fig. 6, sawtooth wave Ramp1 value range is VH(Heavy)~VMID(Middle), sawtooth wave Ramp2 value Range is VMID(Middle)~VL(Light)。
Heavy duty (1/2Imax<Io<Imax) mode: as shown in figure 5, feedback loop will compensate output voltage VEADrive sawtooth wave Ramp1, the two are compared, heavily loaded quality factor qHPwm signal is determined, as shown in fig. 6, sawtooth wave < compensation output voltage VEA When rectifier work in 1 mode, sawtooth wave > compensation output voltage VEAWhen rectifier work in 2 mode, this 3 mode of stage is whole Stream device operating mode is 1,2 mode.The heavily loaded duty ratio D of 2 modeHBy compensation output voltage VEAIt is determined with sawtooth wave Ramp1, The two compares, and compensates output voltage VEARange lower than sawtooth wave Ramp1 is heavily loaded duty ratio DH
It is lightly loaded (0 < Io<1/2Imax) mode: as shown in figure 5, feedback loop will compensate output voltage VEADrive sawtooth wave Ramp2, the two are compared, and are lightly loaded quality factor qLPwm signal is determined, as shown in fig. 6, sawtooth wave < compensation output voltage VEA When rectifier work in 2 mode, sawtooth wave > compensation output voltage VEAWhen rectifier work in 3 mode, the rectification of this 3 mode of stage Device operating mode is 2,3 mode, and the underloading duty ratio of 2 mode is by compensation output voltage VEAIt is determined with sawtooth wave Ramp2, the two It compares, compensates output voltage VEARange higher than sawtooth wave Ramp2 is underloading duty ratio DL
Shoulder load (VEA=VMID) mode: determine rectifier work in heavy duty or light-load mode, heavily loaded quality factor qHOr It is lightly loaded quality factor qLEqual to 1, it may be achieved heavily loaded to underloading smooth transition.
Embodiment:
The present invention relates to a kind of multi-modal rectification circuits, as shown in Figure 1, the input voltage range of LLC resonant converter is 360~400V, specified input direct-current voltage are 380V, and output DC voltage is 33V, rated output power 900W, transformer primary Secondary side the number of turns is respectively 16 circles, 2 circles, turn ratio 8, resonant capacitance CrFor 11nF, resonant inductance LrFor 36uH, magnetizing inductance Lm For 150uH.Entire topological structure is divided into two parts of transformer primary side and secondary side, and primary side includes 4 metal-oxide-semiconductor Q1, The full bridge structure and LLC resonant network (L of Q2, Q3, Q4 compositionr, Cr, Lm)。
As shown in Fig. 2 (a), when LLC resonant converter is in heavy condition, whole switching tubes use legacy frequencies control System, when LLC resonant converter is in zero load, as shown in Fig. 2 (b), the switch controlled mode of left side bridge arm is constant, switching tube Q3 controls signal reset, turns off Q3, and Q4 is controlled signal set, opens Q4.
Below retell outlet side specific embodiment, rectifier can be switched using a kind of 3 mode in outlet side, includes 4 S1, S2, S3, S4 and piece external capacitive body C of synchronous rectifierO, output voltage ripple is reduced, electromagnetic interference is reduced, is improved same Step rectification transfer efficiency, makes system stable operation.
Below by taking the multi-modal rectifier as shown in Fig. 3 (a), Fig. 3 (b), Fig. 3 (c) as an example, illustrate that work of the invention is former Reason.
In Fig. 3 (a), 1 mode is full bridge structure, there are two types of working condition, 1. when the upper end voltage of vice-side winding is timing, Switching tube S1, S4 conducting, secondary current pass through S1, COAnd RO, S4 turn again to vice-side winding;2. when the lower end of vice-side winding electricity Pressure is timing, and switching tube S2, S3 conducting, secondary current is by S3, COAnd RO, S2 turn again to vice-side winding.2 mode switch pipes S1, S2 and 1 mode are identical, and switching tube S3 is disconnected, and S4 is normally closed, is converted into a kind of half-bridge structure, this structure only has a kind of work shape State, 1. when the upper end voltage of vice-side winding is timing, secondary current passes through S1, COAnd RO, S4 turn again to vice-side winding, work as pair The lower end voltage of side winding is timing, and secondary current is without overload, and as shown in Fig. 3 (b), the negative half period of AC wave shape is disappeared It removes, only the input waveform output of half.3 mode are that 4 switching tubes are all closed, and input current is without load end, output electricity Hold COPowering load is idle mode.If only switched between 1 mode, 3 mode, output capacitance can be in several harmonic periods Interior lasting charging, the continuous discharge in next several harmonic periods will cause biggish output voltage ripple △ VDC.This Invention uses 3 mode rectifiers, and 2 mode (underloading) is increased between 1 mode (heavy duty) and 3 mode (zero load), can make to export Voltage is preferably minimized.
Fig. 7 respectively indicates resonant inductance current waveformWith static exciter inductive current waveformBy analyzing electric current Waveform judges controlled resonant converter resonance frequency.
Fig. 8 is multi-modal rectifier DC side output voltage waveform, and as can be seen from Figure 8 multi-modal rectifier can Stablize output DC voltage, is stabilized to 33V.
Fig. 9 is Circuit Fault on Secondary Transformer electric current IacWaveform diagram.
Electric current I is exported when Figure 10 is rectifier full-bridge stateo_acWaveform diagram.
Electric current I is exported when Figure 11 is rectifier half-bridge stateo_acWaveform diagram, when unloaded, four synchronous rectifiers are turned off, No current passes through, therefore the output electric current I without this modeo_acAnalogous diagram, by simulation waveform verifying with Fig. 3 (a), Fig. 3 (b), Fig. 3 (c) theory analysis is consistent, demonstrates feasibility of the invention, and the present invention is suitable for communication power supply, LED drive power etc. DC-DC converts occasion.

Claims (6)

1. a kind of three mode rectification topologies based on LLC resonant converter, comprising:
Positioned at transformer T0 primary side 4 metal-oxide-semiconductors Q1, Q2, Q3, Q4 form full bridge structure and LLC resonant converter, The LLC resonant converter includes resonant inductance Lr, resonant capacitance Cr, static exciter inductance Lm
Rectifier can be switched positioned at 3 mode of transformer T0 secondary side, it includes 4 switching tubes that rectifier, which can be switched, in 3 mode S1, S2, S3, S4 and a piece external capacitive body CO
It is characterized by: signal input part Uin+ pole is separately connected the drain electrode of the drain electrode of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q1's Source electrode connects the drain electrode of metal-oxide-semiconductor Q2, the drain electrode of the source electrode connection metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q3, the source electrode of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q4 Source electrode is all connected with signal input part Uin- pole;The source electrode of metal-oxide-semiconductor Q1 connects resonant capacitance CrOne end, resonant capacitance CrThe other end Connect static exciter inductance LmOne end, static exciter inductance LmThe drain electrode of other end connection metal-oxide-semiconductor Q4;
The source electrode of the drain electrode connection switch pipe S2 of switching tube S1, the drain electrode of the drain electrode connection switch pipe S4 of switching tube S2, switching tube The drain electrode of the source electrode connection switch pipe S3 of S4, the source electrode of the source electrode connection switch pipe S1 of switching tube S3;
The drain electrode of switching tube S1, the source electrode of switching tube S4 are separately connected the both ends of transformer T0 secondary side;
The drain electrode of the source electrode, switching tube S4 of switching tube S3 is separately connected piece external capacitive body COBoth ends.
2. a kind of three mode based on LLC resonant converter using three mode rectification topology as described in claim 1 are whole Stream method, it is characterised in that: topological structure input side is controlled with reference to legacy frequencies, to transformer T0 primary side side metal-oxide-semiconductor Q3, MOS Pipe Q4 control signal is adjusted, and LLC resonant converter is under case of heavy load, and switching tube is all using traditional frequency control System;When LLC resonant converter is in underloading situation, the switch controlled mode of left side bridge arm is constant, and metal-oxide-semiconductor Q3 controls signal 0 is set, metal-oxide-semiconductor Q3 is turned off, metal-oxide-semiconductor Q4 control signal sets 1, opens metal-oxide-semiconductor Q4, i.e., the full-bridge of completion transformer T0 primary side side is to partly The conversion of bridge.
3. a kind of three mode based on LLC resonant converter using three mode rectification topology as described in claim 1 are whole A kind of stream method, it is characterised in that: topological structure input side full-bridge/half-bridge conversion generates full-bridge half-bridge using hystersis controller Switching signal, control bus voltage in the case of full load, achievees the purpose that electric current flows using electric current Dead band controller.
4. a kind of three mode based on LLC resonant converter using three mode rectification topology as described in claim 1 are whole A kind of stream method, it is characterised in that: topological structure outlet side can be switched rectifier using 3 mode, be divided into heavily loaded mode, underloading Mode and idle mode, it includes 4 switching tubes S1, S2, S3, S4 and a piece external capacitive body C which, which can be switched rectifier,O, Heavy duty, underloading and the idle mode of rectifier are adjusted using pulse width modulation (PWM).
5. a kind of three mode method for rectifying based on LLC resonant converter according to claim 4, it is characterised in that:
Heavily loaded mode is full bridge structure, there are two types of working condition, 1. when the upper end voltage of vice-side winding is timing, and switching tube S1, S4 conducting, secondary current pass through S1, COAnd RO, S4 turn again to vice-side winding;2. when the lower end voltage of vice-side winding is timing, Switching tube S2, S3 conducting, secondary current pass through S3, COAnd RO, S2 turn again to vice-side winding;
It is identical with heavily loaded mode to be lightly loaded mode switch pipe S1, S2, switching tube S3 is disconnected, and S4 is normally closed, it is converted into a kind of half-bridge structure, This structure only has a kind of working condition, and 1. when the upper end voltage of vice-side winding is timing, secondary current passes through S1, COAnd RO, S4 again Secondary to return to vice-side winding, when the lower end voltage of vice-side winding is timing, secondary current is without overload, the negative half period of AC wave shape It is eliminated, only the input waveform output of half;
Unloaded mode is that 4 switching tubes are all closed, and input current is without load end, output capacitance COPowering load, for zero load Mode such as only switches between 1 mode, 3 mode, and output capacitance can persistently charge in several harmonic periods, next Continuous discharge in several harmonic periods will cause biggish output voltage ripple △ VDC
6. three mode rectification topology as described in claim 1, it is characterised in that: be suitable for communication power supply or LED drives Power supply DC-DC converts occasion.
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CN112087140A (en) * 2020-07-31 2020-12-15 西安电子科技大学 Multi-mode automatic switching two-stage resonance DC-DC converter
CN112564489A (en) * 2020-11-03 2021-03-26 广州金升阳科技有限公司 Mode control method of switch converter and switch converter

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