CN108462397A - A kind of three road output DC-DC converter of hybrid modulation isolated form - Google Patents

A kind of three road output DC-DC converter of hybrid modulation isolated form Download PDF

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Publication number
CN108462397A
CN108462397A CN201810326915.XA CN201810326915A CN108462397A CN 108462397 A CN108462397 A CN 108462397A CN 201810326915 A CN201810326915 A CN 201810326915A CN 108462397 A CN108462397 A CN 108462397A
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China
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power switch
switch tube
power
side winding
vice
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CN201810326915.XA
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CN108462397B (en
Inventor
邓焰
李广地
夏晋
陈桂鹏
王昆
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Zhejiang University ZJU
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Zhejiang University ZJU
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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
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/0077—Plural converter units whose outputs are connected in series
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
    • 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)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of three tunnels of hybrid modulation isolated form to export DC DC converters, including：Input power；DC input voitage is transformed to high DC output voltage by full-bridge LLC resonance circuits in parallel using frequency modulated mode, and secondary side is full-wave rectifying circuit structure；Phase whole-bridging circuit, including the first branch and the second branch, the first branch is connected between any two bridge arm of the full-bridge LLC resonance circuits in parallel, and DC input voitage is transformed to the first low DC output voltage using the phase mode adjusted between two bridge arms；The second branch is connected between remaining two bridge arms of the full-bridge LLC resonance circuits in parallel, and DC input voitage is transformed to the second low DC output voltage using the phase mode adjusted between two bridge arms；Secondary side is full-wave rectifying circuit structure.The converter passes through mutually isolated between two different control method realizations three tunnels output between two bridge arms.

Description

A kind of three road output DC-DC converter of hybrid modulation isolated form
Technical field
The invention belongs to field of power electronics, and in particular to a kind of three road output DC-DC converter of hybrid modulation isolated form.
Background technology
With the development of digital control technology, the power reguirements needed for many Novel electric equipment are higher and higher, many use Electric equipment had not only needed high voltage direct current to power at runtime, but need multichannel low-voltage dc power supply to auxiliary system and control system into Row power supply.It is powered according to multiple input power supply, the volume and cost of system can be increased, be unfavorable for integration of equipments.And In traditional multiplex output circuit, it cannot accomplish completely isolated and independent adjustment between a few road output voltages, wherein exporting all the way State can export other two-way when fluctuating and affect greatly, this can seriously affect system overall stability.
N.Ali, T.H.Mehrdad et al. are in entitled A Nonisolated Multiinput Multioutput DC- DC Boost Converter for Electric Vehicle Applications(IEEE Transactions on Power Electronics, 2015.30 (4), pp 1818-1835) propose a kind of DC-DC transformation of multiple-input and multiple-output Device, the converter may be implemented multiple multiple-channel outputs, but do not have between each road output of the converter it is mutually isolated, and mutually it Between influence each other, it is difficult to meet requirement of the present electrical equipment to the converter of multiple-channel output.
The patent application of Publication No. CN1870408A discloses a kind of multi-channel output DC-DC inverter, including becomes Depressor, main rectification circuit and bypass rectification circuit, pwm control circuit, it is transformer secondary winding output end and main rectification circuit, auxiliary Road rectification circuit input end is connected；It is additionally provided with the chopper that the first and second switching tube is composed in series, pwm control circuit exports respectively Duty ratio be D and 1-D pulse to the first and second switching tube control terminal, make the first, second switching tube end time fix, Be additionally provided with by resonant capacitance, the first resonant inductance, be parallel to transformer primary side winding the second resonant inductance be composed in series it is humorous Shake circuit, and the input terminal of resonant tank is connected with the output end of chopper, and the first resonant inductance and resonant capacitance resonance realize the One, the quasi- zero-current switching of two switching tubes, the second resonant inductance, the first resonant inductance Lr and resonance capacitor resonance realize first and second Switch tube zero voltage is open-minded.The technology contents can be easier to realize Sofe Switch, improve efficiency, but be not carried out each road and export it Between it is mutual indepedent be isolated.
Invention content
For the above-mentioned technical problem present in the prior art, the present invention proposes a kind of three tunnel of hybrid modulation isolated form output DC-DC converter.The converter realized by two different control methods between two bridge arms between the output of three tunnels it is mutual every From；The converter realizes steady dc voltage output by controlling output voltage；Meanwhile the converter has high frequency transformation The function of electrical isolation may be implemented in device.
For achieving the above object, the present invention provides following technical scheme：
A kind of three road output DC-DC converter of hybrid modulation isolated form, including：
Input power；
DC input voitage is transformed to high direct current output electricity by full-bridge LLC resonance circuits in parallel using frequency modulated mode Pressure, secondary side are full-wave rectifying circuit structure；
Phase whole-bridging circuit, including the first branch and the second branch, the first branch are connected to the full-bridge LLC in parallel Between any two bridge arm of resonance circuit, DC input voitage is transformed to using the phase mode adjusted between two bridge arms First low DC output voltage；The second branch be connected to the full-bridge LLC resonance circuits in parallel remaining two bridge arms it Between, DC input voitage is transformed to by the second low DC output voltage using the phase mode adjusted between two bridge arms；Secondary side For full-wave rectifying circuit structure.
The DC-DC converter of the present invention has electrical isolation, low cost, high efficiency, high power density, different output voltages Between it is mutual indepedent the advantages that.
Preferably, the full-bridge LLC resonance circuits in parallel include：
First bridge arm, it is in parallel with the input power, by concatenated first power switch tube and the second power switch tube group At, the drain electrode of the first power switch tube is connected with the anode of the input power, the source electrode of the second power switch tube with it is described defeated The cathode for entering power supply is connected；
Second bridge arm, it is in parallel with the input power, by concatenated third power switch tube and the 4th power switch tube group At, the drain electrode of third power switch tube is connected with the anode of the input power, the source electrode of the 4th power switch tube with it is described defeated The cathode for entering power supply is connected；
Third bridge arm, it is in parallel with the input power, by concatenated 5th power switch tube and the 6th power switch tube group At, the drain electrode of the 5th power switch tube is connected with the anode of the input power, the source electrode of the 6th power switch tube with it is described defeated The cathode for entering power supply is connected；
Four bridge legs, it is in parallel with the input power, by concatenated 7th power switch tube and the 8th power switch tube group At, the drain electrode of the 7th power switch tube is connected with the anode of the input power, the source electrode of the 8th power switch tube with it is described defeated The cathode for entering power supply is connected；
First resonant cavity, by sequentially connected first resonant capacitance, the first resonant inductance and the first transformer primary side around Group composition, wherein the first resonant capacitance anode be connected with the source electrode of first power switch tube, the first transformer primary side around The different name end of group is connected with the source electrode of the third power switch tube；
Second resonant cavity, by sequentially connected second resonant capacitance, the second resonant inductance and the second transformer primary side around Group composition, wherein the second resonant capacitance anode be connected with the source electrode of the 5th power switch tube, the second transformer primary side around The different name end of group is connected with the source electrode of the 7th power switch tube；
First power switch tube, the second power switch tube, third power switch tube and the 4th power switch tube, the 5th Power switch tube, the 6th power switch tube, the 7th power switch tube and the 8th power switch tube carry anti-and diode.
In the present invention, it can be reduced relative to traditional LLC resonance circuit using the LLC cavity resonator structures of two-way parallel connection each The resonance current of a resonant cavity reduces the current stress per device on the way, to reduce volume and the loss of magnetic cell, improves The efficiency of converter.
Preferably, the secondary side of the full-bridge LLC resonance circuits in parallel includes：
First vice-side winding of the first transformer, the second vice-side winding of the first transformer, first vice-side winding Different name end is connected with the Same Name of Ends of the second vice-side winding；
First power diode, anode are connected with the Same Name of Ends of first vice-side winding,
Second power diode, anode are connected with the different name end of second vice-side winding, cathode and first power The cathode of diode is connected；
The third vice-side winding of second transformer, the 4th vice-side winding of the second transformer, the third vice-side winding Different name end is connected with the Same Name of Ends of the 4th vice-side winding；
Third power diode, anode are connected with the Same Name of Ends of the third vice-side winding,
4th power diode, anode are connected with the different name end of the 4th vice-side winding, cathode and the third power The cathode of diode is connected；
First filter capacitor, cathode are connected with the different name end of first vice-side winding, positive and first power two The cathode of pole pipe is connected；
Second filter capacitor, cathode are connected with the different name end of the third vice-side winding, anode simultaneously with the third work( The cathode of rate diode is connected with the cathode of first filter capacitor；
High direct current of the anode of first filter capacitor with the cathode of second filter capacitor as DC-DC converter Voltage output end.
Preferably, the primary side of the phase whole-bridging circuit includes：
First branch primary side is made of, the first blocking sequentially connected first capacitance, third transformer primary side winding The anode of capacitance is connected with the source electrode of first power switch tube, the different name end of third transformer primary side winding and the described 5th The source electrode of power switch tube is connected；
The second branch primary side is made of, the second blocking sequentially connected second capacitance, the 4th transformer primary side winding The anode of capacitance is connected with the source electrode of the third power switch tube, the different name end of the 4th transformer primary side winding and the described 7th The source electrode of power switch tube is connected.
Preferably, the secondary side of the phase whole-bridging circuit includes：
5th vice-side winding of third transformer, the 6th vice-side winding of third transformer, the 5th vice-side winding Different name end is connected with the Same Name of Ends of the 6th vice-side winding；
5th power diode, anode are connected with the Same Name of Ends of the 5th vice-side winding,
6th power diode, anode are connected with the different name end of the 6th vice-side winding, cathode and the 5th power The cathode of diode is connected；
First filter inductance, the positive cathode with the 5th power diode are connected, cathode and third filter capacitor Anode is connected；
Third filter capacitor, the positive cathode with first filter inductance are connected, cathode and the 5th vice-side winding Different name end be connected；
First low dc voltage output end of the positive electrode and negative electrode of the third filter capacitor as DC-DC converter.
Preferably, the secondary side of the phase whole-bridging circuit includes：
7th vice-side winding of the 4th transformer, the 8th vice-side winding of the 4th transformer, the 7th vice-side winding Different name end is connected with the Same Name of Ends of the 8th vice-side winding；
7th power diode, anode are connected with the Same Name of Ends of the 7th vice-side winding,
8th power diode, anode are connected with the different name end of the 8th vice-side winding, cathode and the 7th power The cathode of diode is connected；
Second filter inductance, the positive cathode with the 7th power diode are connected, cathode and the 4th filter capacitor Anode is connected；
4th filter capacitor, the positive cathode with second filter inductance are connected, cathode and the 7th vice-side winding Different name end be connected；
Second low dc voltage output end of the positive electrode and negative electrode of 4th filter capacitor as DC-DC converter.
Wherein, first power switch tube, the second power switch tube, third power switch tube, the 4th power switch tube, 5th power switch tube, the 6th power switch tube, the 7th power switch tube and the 8th power switch tube are power metal-oxidation Object semiconductor field effect transistor.
The DC voltage of the High Level DC Voltage output end output 200V~400V.The first low dc voltage output end Export the DC voltage of 48V.The DC voltage of the second low dc voltage output end output 24V.
Wherein, the secondary side of the full-bridge LLC resonance circuits in parallel can also be full bridge rectifier structure.
Compared with prior art, the device have the advantages that being：
(1) use the LLC cavity resonator structures of two-way parallel connection that can reduce each resonance relative to traditional LLC resonance circuit The resonance current of chamber reduces the current stress per device on the way, to reduce volume and the loss of magnetic cell, improves converter Efficiency.
(2) output of LLC resonance circuits exports from two-way phase-shifting full-bridge and uses different control methods, realizes the output of three tunnels Independent control, reduce three tunnels output between cross regulation rate.
(3) LLC resonance circuits, can be humorous with preferably two using the input concatenated resonant cavity parallel way of parallel connection-output The stream to shake between chamber.
Mutually isolated between the output of (4) three tunnels, mutual independent control can meet the occasions such as different voltages grade It is required that；Zero-voltage soft switch may be implemented in the switching tube of primary side, can reduce the switching loss of switching tube, the effect of Lifting Transform device Rate.
Description of the drawings
Fig. 1 is the structural schematic diagram of three road output DC-DC converter of hybrid modulation isolated form provided by the invention；
Fig. 2 is the working waveform figure of three road output DC-DC converter of hybrid modulation isolated form provided by the invention；
Fig. 3 is equivalent circuit diagram when DC-DC converter shown in FIG. 1 is in operation mode 1；
Fig. 4 is equivalent circuit diagram when DC-DC converter shown in FIG. 1 is in operation mode 2；
Fig. 5 is equivalent circuit diagram when DC-DC converter shown in FIG. 1 is in operation mode 3；
Fig. 6 is equivalent circuit diagram when DC-DC converter shown in FIG. 1 is in operation mode 4.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, with reference to the accompanying drawings and embodiments to this Invention is described in further detail.It should be appreciated that the specific embodiments described herein are only used to explain the present invention, Do not limit protection scope of the present invention.
A kind of three road output DC-DC converter of hybrid modulation isolated form, including a full-bridge LLC resonance circuit and two in parallel A phase whole-bridging circuit；The primary side of full-bridge LLC resonance circuits is full-bridge circuit structure, and secondary side is full-wave rectifying circuit structure；It adopts Diode is power diode.
As shown in Figure 1, primary circuit includes：
1) with input voltage VinAnd the first primary side branch even, by the first power switch tube S1, the second power switch tube S2 Composition；With input voltage VinAnd the second primary side branch even, by third power switch tube S3, the 4th power switch tube S4Composition； With input voltage VinAnd third primary side branch even, by the 5th power switch tube S5, the 6th power switch tube S6Composition；With input Voltage VinAnd the 4th primary side branch even, by the 7th power switch tube S7, the 8th power switch tube S8Composition.Wherein, the first work( Rate switching tube S1, the second power switch tube S2, third power switch tube S3, the 4th power switch tube S4, the 5th power switch tube S5、 6th power switch tube S6, the 7th power switch tube S7With the 8th power switch tube S8It is power metal-oxide semiconductor field Effect transistor (MOSFET).
2) the first resonant cavity of LLC resonance circuits is by resonant capacitance Cr1, resonant inductance Lr1With transformer T1(transformer T1Deng It imitates by magnetizing inductance Lm1Formed with ideal transformer) composition, it is connected with the first primary side branch and the second primary side branch.Resonance electricity Hold Cr1With resonant inductance Lr1Series connection, resonant capacitance Cr1First power switch tube S of one end and the first primary side branch road1Source electrode It is connected, resonant inductance Lr1One end and transformer T1The Same Name of Ends of primary side winding is connected, the different name end of transformer primary side winding with Second primary side branch road third power switch tube S3Source electrode be connected.
3) the second resonant cavity of LLC resonance circuits is by resonant capacitance Cr2, resonant inductance Lr2With transformer T2(transformer T2Deng It imitates by magnetizing inductance Lm2Formed with ideal transformer) composition, it is connected with third primary side branch and the 4th primary side branch.Resonance electricity Hold Cr2With resonant inductance Lr2Series connection, resonant capacitance Cr25th power switch tube S of one end and third primary side branch road5Source electrode It is connected, resonant inductance Lr2One end and transformer T2The Same Name of Ends of primary side winding is connected, the different name end of transformer primary side winding with 4th the 7th power switch tube S of primary side branch road7Source electrode be connected.
Pass through the first power switch tube S on the first bridge arm of adjusting, the second bridge arm, third bridge arm and four bridge legs1, the second work( Rate switching tube S2, third power switch tube S3, the 4th power switch tube S4, the 5th power switch tube S5, the 6th power switch tube S6、 7th power switch tube S7With the 8th power switch tube S8Switching frequency, and then change resonant network gain, come adjust output Voltage Vout1To obtain required voltage value.
4) the first transformer branch of phase whole-bridging circuit is by capacitance CB1With transformer T3(transformer T3It is equivalent at by Leakage inductance L as resonant inductancer3Formed with ideal transformer) composition, it is connected with the first primary side branch and third primary side branch.Every Straight capacitance CB1With transformer T3Primary side winding is connected, capacitance CB1First power switch tube of one end and the first primary side branch road S1Source electrode be connected, capacitance CB1The other end and transformer T3The Same Name of Ends of primary side winding is connected, transformer T3Primary side winding Different name end and the 5th power switch tube S of third primary side branch road5Source electrode be connected.
5) the second transformer branch of phase whole-bridging circuit is by capacitance CB2With transformer T4(transformer T4It is equivalent at by Leakage inductance L as resonant inductancer4Formed with ideal transformer) composition, it is connected with the second primary side branch and the 4th primary side branch.Every Straight capacitance CB2With transformer T4Primary side winding is connected, capacitance CB2The third power switch tube of one end and the second primary side branch road S3Source electrode be connected, capacitance CB2The other end and transformer T4The Same Name of Ends of primary side winding is connected, transformer T4Primary side winding Different name end and the 4th the 7th power switch tube S of primary side branch road7Source electrode be connected.
By adjusting the phase between the first bridge arm and third bridge arm, to adjust output voltage Vout2；By adjusting second Phase between bridge arm and four bridge legs, to adjust output voltage Vout3。
Secondary circuit includes：
1) parallel connection LLC resonance circuit pairs side exports branch, by the first power diode Do1, the second power diode Do2, Three power diode Do3, the 4th power diode Do4, the first output filter capacitor Co1, the second output filter capacitor Co2, isolation become Depressor T1Two vice-side windings and isolating transformer T2Two vice-side windings composition；Wherein isolating transformer T1It is first secondary Side Motor Winding Same Name of Ends and the first power diode Do1Anode be connected, the first vice-side winding different name end and isolating transformer T1 Second mate side Motor Winding Same Name of Ends is connected, and is connected to the first output filter capacitor Co1Cathode；The different name end of second vice-side winding with Second power diode Do2Anode be connected, the second power diode Do2Cathode and the first power diode Do1Cathode phase Even, it is connected in parallel to the first output filter capacitor Co1Anode；Wherein, isolating transformer T2Third vice-side winding Same Name of Ends and Three power diode Do3Anode be connected, third vice-side winding different name end and isolating transformer T2Fourth officer side Motor Winding Same Name of Ends It is connected, and is connected to the second output filter capacitor Co2Cathode；The different name end of 4th vice-side winding and the 4th power diode Do4 Anode be connected, the 4th power diode Do4Cathode and third power diode Do3Cathode be connected, it is defeated to be connected in parallel to second Go out filter capacitor Co2Anode.
2) the first phase whole-bridging circuit pair side exports branch, by the 5th power diode Do5, the 6th power diode Do6、 First output inductor Lf1, third output filter capacitor Co3With isolating transformer T3Two vice-side windings composition.Its interval From transformer T3The 5th vice-side winding Same Name of Ends and the 5th power diode Do5Anode be connected, different name end with transformation is isolated Device T3The 6th vice-side winding Same Name of Ends be connected, and be connected to third output filter capacitor Co3Cathode；Isolating transformer T3's 6th vice-side winding different name end and the 6th power diode Do6Anode be connected, the 6th power diode Do6Cathode and the 5th Power diode Do5Cathode be connected, and be connected to the first output inductor Lf1One end；First output inductor Lf1's The other end is connected to third output capacitance Co3Anode.
3) the second phase whole-bridging circuit pair side exports branch, by the 7th power diode Do7, the 8th power diode Do8、 Second output inductor Lf2, the 4th output filter capacitor Co4With isolating transformer T4Two vice-side windings composition.Its interval From transformer T4The 7th vice-side winding Same Name of Ends and the 7th power diode Do7Anode be connected, different name end with transformation is isolated Device T4The 8th vice-side winding Same Name of Ends be connected, and be connected to the 4th output filter capacitor Co4Cathode；Isolating transformer T4's 8th vice-side winding different name end and the 8th power diode Do8Anode be connected, the 8th power diode Do8Cathode and the 7th Power diode Do7Cathode be connected, and be connected to the second output inductor Lf2One end；Second output inductor Lf2's The other end is connected to the 4th output capacitance Co4Anode.
4) output loading：Output loading is load RL1、RL2、RL3, load RL1、RL2、RL3It is connected across the positive and negative of output port Both ends.
With traditional multiple-channel output parallel connection LLC resonance circuits compared with phase whole-bridging circuit DC-DC converter, the present embodiment Realize between the output of each road it is mutual indepedent be isolated.Wherein, full-bridge parallel connection LLC resonance circuits are by the way of adjusting frequency Carry out pressure regulation, the DC voltage of design output 200V~400V, referred to as high-pressure side；By adjusting first via phase whole-bridging circuit Phase carries out pressure regulation, the DC voltage of design output 48V, referred to as the first low-pressure side；By adjusting the second road phase whole-bridging circuit Phase carry out pressure regulation, design output 24V DC voltage, referred to as the second low-pressure side.
To describe operation mode commutation course, it is as follows to make assumed condition：
(1) for simplifying the analysis, the resonant inductance L in two-way parallel connection LLC resonance circuitsr1=Lr2, resonant capacitance Cr1= Cr2, magnetizing inductance Lm1=Lm2；
(2) for simplifying the analysis, in analysis, ignore the dead time of two switching tubes on the same bridge arm；
(3) first primary side branches, the second primary side branch, third primary side branch and two switch up and down of the 4th primary side branch road Pipe is operated in complementary state, and the duty ratio of each switching tube conducting is 0.5.
Phase shift between (4) first primary side branches and third primary side branch is more than 0 °, is less than 180 °；Second primary side branch and Phase shift between 4th primary side branch is more than 0 °, is less than 180 °.
Commutation course analyzes (ignoring dead time)：
1) mode 1：[t0~t1]
As shown in figure 3, switching tube S1、S4Conducting, switching tube S2、S3Shutdown, switching tube S5、S8Shutdown, switching tube S6、S7It leads It is logical, resonant inductance Lr1With resonant capacitance Cr1Resonance, resonance current i occursLr1Lag input voltage, switching tube S1、S4Zero-voltage soft It is open-minded, resonance current iLr1Change in sinusoidal form, resonance current iLr1With excitation inductance current iLm1Difference be transmitted to secondary side；It is humorous Shake inductance Lr2With resonant capacitance Cr2Resonance, resonance current i occursLr2Change in sinusoidal form, excitation inductance current iLm2With resonance Electric current iLr2Difference be transmitted to secondary side；The input voltage v of first via phase-shifting full-bridgeACFor+Vin, electric current iLr3It linearly increases；Second The input voltage v of road phase-shifting full-bridgeBDFor-Vin, electric current iLr4It is linear to reduce.
2) mode 2：[t1~t2]
As shown in figure 4, switching tube S1、S4Conducting, switching tube S2、S3Shutdown, switching tube S5、S8Conducting, switching tube S6、S7It closes It is disconnected, resonant inductance Lr1With resonant capacitance Cr1Resonance, resonance current i occursLr1Change in sinusoidal form, resonance current iLr1With encourage Magnetoelectricity inducing current iLm1Difference be transmitted to secondary side；Resonant inductance Lr2With resonant capacitance Cr2Resonance, resonance current i occursLr2It lags defeated Enter voltage, switching tube S5、S8Zero-voltage soft is open-minded, resonance current iLr2Change in sinusoidal form, resonance current iLr2With magnetizing inductance Electric current iLm2Difference be transmitted to secondary side；The input voltage v of first via phase-shifting full-bridgeACIt is 0, secondary side diode D at this timeo5And Do6Simultaneously Conducting so that transformer T3Vice-side winding voltage be 0, primary side winding voltage also mutually should be 0, transformer T3Leakage inductance Lr3With every Straight capacitance CB1Work is under resonance condition；Equally, the input voltage v of the second road phase-shifting full-bridgeBDIt is 0, secondary side diode D at this timeo7 And Do8It simultaneously turns on so that transformer T4Vice-side winding voltage be 0, primary side winding voltage also mutually should be 0, transformer T4Leakage Feel Lr4With capacitance CB2Work is under resonance condition.
3) mode 3：[t2~t3]
As shown in figure 5, switching tube S1、S4Shutdown, switching tube S2、S3Conducting, switching tube S5、S8Conducting, switching tube S6、S7It closes It is disconnected, resonant inductance Lr1With resonant capacitance Cr1Resonance, resonance current i occursLr1Lag input voltage, switching tube S2、S3Zero-voltage soft It is open-minded, resonance current iLr1Change in sinusoidal form, excitation inductance current iLm1With resonance current iLr1Difference be transmitted to secondary side；It is humorous Shake inductance Lr2With resonant capacitance Cr2Resonance, resonance current i occursLr2Change in sinusoidal form, resonance current iLr2With magnetizing inductance Electric current iLm2Difference be transmitted to secondary side；The input voltage of first via phase whole-bridging circuit is-Vin, electric current iLr3It is linear to reduce；The The input voltage of two road phase whole-bridging circuits is+Vin, electric current iLr4It linearly increases.
4) mode 4：[t3~t4]
As shown in fig. 6, switching tube S1、S4Shutdown, switching tube S2、S3Conducting, switching tube S5、S8Shutdown, switching tube S6、S7It leads It is logical, resonant inductance Lr1With resonant capacitance Cr1Resonance, resonance current i occursLr1Change in sinusoidal form, excitation inductance current iLm1 With resonance current iLr1Difference be transmitted to secondary side；Resonant inductance Lr2With resonant capacitance Cr2Resonance, resonance current i occursLr2It lags defeated Enter voltage, switching tube S6、S7Zero-voltage soft is open-minded, resonance current iLr2Change in sinusoidal form, excitation inductance current iLm2With resonance Electric current iLr2Difference be transmitted to secondary side；The input voltage v of first via phase-shifting full-bridgeACIt is 0, secondary side diode D at this timeo5And Do6Simultaneously Conducting so that transformer T3Vice-side winding voltage be 0, primary side winding voltage also mutually should be 0, transformer T3Leakage inductance Lr3With every Straight capacitance CB1Work is under resonance condition；Equally, the input voltage v of the second road phase-shifting full-bridgeBDIt is 0, secondary side diode D at this timeo7 And Do8It simultaneously turns on so that transformer T4Vice-side winding voltage be 0, primary side winding voltage also mutually should be 0, transformer T4Leakage Feel Lr4With capacitance CB2Work is under resonance condition.
Technical scheme of the present invention and advantageous effect is described in detail in above-described specific implementation mode, Ying Li Solution is not intended to restrict the invention the foregoing is merely presently most preferred embodiment of the invention, all principle models in the present invention Interior done any modification, supplementary, and equivalent replacement etc. are enclosed, should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of three road output DC-DC converter of hybrid modulation isolated form, which is characterized in that including：
Input power；
DC input voitage is transformed to high DC output voltage by full-bridge LLC resonance circuits in parallel using frequency modulated mode, secondary Side is full-wave rectifying circuit structure；
Phase whole-bridging circuit, including the first branch and the second branch, the first branch are connected to the full-bridge LLC resonance in parallel Between any two bridge arm of circuit, DC input voitage is transformed to first using the phase mode adjusted between two bridge arms Low DC output voltage；The second branch is connected between remaining two bridge arms of the full-bridge LLC resonance circuits in parallel, is adopted DC input voitage is transformed to the second low DC output voltage with the phase mode adjusted between two bridge arms；Secondary side is all-wave Rectifier circuit structure.
2. three road output DC-DC converter of hybrid modulation isolated form as described in claim 1, which is characterized in that the parallel connection Full-bridge LLC resonance circuits include：
First bridge arm, it is in parallel with the input power, it is made of concatenated first power switch tube and the second power switch tube, the The drain electrode of one power switch tube is connected with the anode of the input power, the source electrode of the second power switch tube and the input power Cathode be connected；
Second bridge arm, it is in parallel with the input power, it is made of concatenated third power switch tube and the 4th power switch tube, the The drain electrode of three power switch tubes is connected with the anode of the input power, source electrode and the input power of the 4th power switch tube Cathode be connected；
Third bridge arm, it is in parallel with the input power, it is made of concatenated 5th power switch tube and the 6th power switch tube, the The drain electrode of five power switch tubes is connected with the anode of the input power, source electrode and the input power of the 6th power switch tube Cathode be connected；
Four bridge legs, it is in parallel with the input power, it is made of concatenated 7th power switch tube and the 8th power switch tube, the The drain electrode of seven power switch tubes is connected with the anode of the input power, source electrode and the input power of the 8th power switch tube Cathode be connected；
First resonant cavity, by sequentially connected first resonant capacitance, the first resonant inductance and the first transformer primary side winding group At, wherein the anode of the first resonant capacitance is connected with the source electrode of first power switch tube, the first transformer primary side winding Different name end is connected with the source electrode of the third power switch tube；
Second resonant cavity, by sequentially connected second resonant capacitance, the second resonant inductance and the second transformer primary side winding group At, wherein the anode of the second resonant capacitance is connected with the source electrode of the 5th power switch tube, the second transformer primary side winding Different name end is connected with the source electrode of the 7th power switch tube；
First power switch tube, the second power switch tube, third power switch tube and the 4th power switch tube, the 5th power Switching tube, the 6th power switch tube, the 7th power switch tube and the 8th power switch tube carry anti-and diode.
3. three road output DC-DC converter of hybrid modulation isolated form as claimed in claim 2, which is characterized in that the parallel connection The secondary side of full-bridge LLC resonance circuits includes：
First vice-side winding of the first transformer, the second vice-side winding of the first transformer, the different name of first vice-side winding End is connected with the Same Name of Ends of the second vice-side winding；
First power diode, anode are connected with the Same Name of Ends of first vice-side winding,
Second power diode, anode are connected with the different name end of second vice-side winding, cathode and two pole of the first power The cathode of pipe is connected；
The third vice-side winding of second transformer, the 4th vice-side winding of the second transformer, the different name of the third vice-side winding End is connected with the Same Name of Ends of the 4th vice-side winding；
Third power diode, anode are connected with the Same Name of Ends of the third vice-side winding,
4th power diode, anode are connected with the different name end of the 4th vice-side winding, cathode and two pole of third power The cathode of pipe is connected；
First filter capacitor, cathode are connected with the different name end of first vice-side winding, positive and first power diode Cathode be connected；
Second filter capacitor, cathode are connected with the different name end of the third vice-side winding, anode simultaneously with the third power two The cathode of pole pipe is connected with the cathode of first filter capacitor；
High Level DC Voltage of the anode of first filter capacitor with the cathode of second filter capacitor as DC-DC converter Output end.
4. three road output DC-DC converter of hybrid modulation isolated form as claimed in claim 3, which is characterized in that the phase shift The primary side of full-bridge circuit includes：
First branch primary side is made of, the first capacitance sequentially connected first capacitance, third transformer primary side winding Anode be connected with the source electrode of first power switch tube, the different name end of third transformer primary side winding and the 5th power The source electrode of switching tube is connected；
The second branch primary side is made of, the second capacitance sequentially connected second capacitance, the 4th transformer primary side winding Anode be connected with the source electrode of the third power switch tube, the different name end of the 4th transformer primary side winding and the 7th power The source electrode of switching tube is connected.
5. three road output DC-DC converter of hybrid modulation isolated form as claimed in claim 4, which is characterized in that the phase shift The secondary side of full-bridge circuit includes：
5th vice-side winding of third transformer, the 6th vice-side winding of third transformer, the different name of the 5th vice-side winding End is connected with the Same Name of Ends of the 6th vice-side winding；
5th power diode, anode are connected with the Same Name of Ends of the 5th vice-side winding,
6th power diode, anode are connected with the different name end of the 6th vice-side winding, cathode and two pole of the 5th power The cathode of pipe is connected；
First filter inductance, the positive cathode with the 5th power diode are connected, the anode of cathode and third filter capacitor It is connected；
Third filter capacitor, the positive cathode with first filter inductance are connected, and cathode is different with the 5th vice-side winding Name end is connected；
First low dc voltage output end of the positive electrode and negative electrode of the third filter capacitor as DC-DC converter.
6. three road output DC-DC converter of hybrid modulation isolated form as claimed in claim 5, which is characterized in that the phase shift The secondary side of full-bridge circuit includes：
7th vice-side winding of the 4th transformer, the 8th vice-side winding of the 4th transformer, the different name of the 7th vice-side winding End is connected with the Same Name of Ends of the 8th vice-side winding；
7th power diode, anode are connected with the Same Name of Ends of the 7th vice-side winding,
8th power diode, anode are connected with the different name end of the 8th vice-side winding, cathode and two pole of the 7th power The cathode of pipe is connected；
Second filter inductance, the positive cathode with the 7th power diode are connected, the anode of cathode and the 4th filter capacitor It is connected；
4th filter capacitor, the positive cathode with second filter inductance are connected, and cathode is different with the 7th vice-side winding Name end is connected；
Second low dc voltage output end of the positive electrode and negative electrode of 4th filter capacitor as DC-DC converter.
7. three road output DC-DC converter of hybrid modulation isolated form as claimed in claim 2, which is characterized in that described first Power switch tube, the second power switch tube, third power switch tube, the 4th power switch tube, the 5th power switch tube, the 6th work( Rate switching tube, the 7th power switch tube and the 8th power switch tube are power metal-oxide semiconductor field effect transistor.
8. such as three road output DC-DC converter of claim 1~7 any one of them hybrid modulation isolated form, which is characterized in that The DC voltage of the High Level DC Voltage output end output 200V~400V.
9. such as three road output DC-DC converter of claim 1~7 any one of them hybrid modulation isolated form, which is characterized in that The DC voltage of the first low dc voltage output end output 48V.
10. such as three road output DC-DC converter of claim 1~7 any one of them hybrid modulation isolated form, feature exists In the DC voltage of the second low dc voltage output end output 24V.
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CN113179012A (en) * 2021-03-16 2021-07-27 天地（常州）自动化股份有限公司 DC voltage-stabilized source suitable for mining multistage AC voltage input
CN113794381A (en) * 2021-09-16 2021-12-14 国网山西省电力公司电力科学研究院 SCDAB-CLLLC composite direct current transformer with wide voltage regulation range and control method thereof
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WO2020134313A1 (en) * 2018-12-29 2020-07-02 中兴通讯股份有限公司 Full-bridge circuit and full-bridge converter
CN111384858A (en) * 2018-12-29 2020-07-07 中兴通讯股份有限公司 Full-bridge circuit and full-bridge converter
CN110086349A (en) * 2019-05-27 2019-08-02 佛山科学技术学院 A kind of full-bridge isolation DC-DC circuit
CN110086349B (en) * 2019-05-27 2024-02-13 佛山科学技术学院 Full-bridge isolation DC-DC circuit
CN111064370B (en) * 2019-12-26 2021-05-25 南京工程学院 LLC and DAB mixed bidirectional DC-DC converter
CN111064370A (en) * 2019-12-26 2020-04-24 南京工程学院 LLC and DAB mixed bidirectional DC-DC converter
CN111987929A (en) * 2020-08-20 2020-11-24 北京工业大学 Double-full-bridge feedback type voltage compensation system
CN113179012A (en) * 2021-03-16 2021-07-27 天地（常州）自动化股份有限公司 DC voltage-stabilized source suitable for mining multistage AC voltage input
CN113794381B (en) * 2021-09-16 2023-05-23 国网山西省电力公司电力科学研究院 SCDAB-CLLLC composite direct-current transformer with wide voltage regulation range and control method thereof
CN113794381A (en) * 2021-09-16 2021-12-14 国网山西省电力公司电力科学研究院 SCDAB-CLLLC composite direct current transformer with wide voltage regulation range and control method thereof
CN113964921B (en) * 2021-11-01 2024-02-02 国网湖北省电力有限公司电力科学研究院 Charging circuit of multiport new energy electric automobile
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