CN106655786A - Multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit - Google Patents
Multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit Download PDFInfo
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- CN106655786A CN106655786A CN201611042076.6A CN201611042076A CN106655786A CN 106655786 A CN106655786 A CN 106655786A CN 201611042076 A CN201611042076 A CN 201611042076A CN 106655786 A CN106655786 A CN 106655786A
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Classifications
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback 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
- 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
Abstract
The present invention relates to a multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit. The multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit comprises a plurality of controllable bridge arms, a plurality of isolation transformers, and a plurality of sets of fast recovery diodes; the controllable bridge arm includes a first power switching device and a second power switching device; the cathodes of all the first fast recovery diode are connected with one end of an output filtering inductor, and the other end of the output filtering inductor is connected with the positive pole of an output filtering capacitor so as to be adopted as the positive pole of direct current output; and the anodes of the all the second fast recovery diodes are connected with the negative pole of the output filtering capacitor so as to be adopted as the negative pole of the direct current output. According to the multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit of the present invention, the current stress of a single power switching device is reduced, for example, the current stress is reduced to half of the original when a four-phase bridge mode is adopted; the power switching devices are not directly connected in parallel, and therefore, serious damage can be avoided; and the power of the high-frequency isolation transformers is reduced, and implementation difficulty can be reduced.
Description
Technical field
The present invention relates to a kind of multiphase DC/DC converter circuit, and in particular to a kind of multiphase bridge times streaming PWM isolated DC
Translation circuit.
Background technology
Traditional DCDC dc sources employ single-phase full bridge form, and it coordinates phase shifting control strategy and Sofe Switch skill
Art is almost ultimate attainment by single-phase full bridge circuit.
High-power direct-current switch power source field, the type selecting of its power device is always a most key link, and work(
The type selecting of rate device its voltage stress, current stress, switching frequency characteristic it is most important.Switching device is reduced from circuit
Current stress is particularly important.
It is the strategy using simultaneously machine that tradition increases DCDC Dc source powers, or using switching device parallel way.And
Machine scheme needs to realize multiple stage dc source Parallel opertation by the stream measure of control circuit that control mode is complicated.And adopt
Switching device parallel way, during high-frequency work, because the difference of switching device or driving element causes electric current to distribute not
, switch time delay does not cause on an equal basis whole system to damage.Become in single-phase full bridge and change, export transformer only one of which.It is high-power
In the case of, the power of transformer increases, and high frequency transformer processing technology has high demands, it may be difficult to realize.
The content of the invention
To solve the device for power switching current stress of high-power PWM DC converters, the present invention provides a kind of reliable
Multiphase bridge times streaming PWM isolated DC translation circuit.By many bridge arms, again the mode of flowing reduces device for power switching current stress,
Simplify the design technology of output transformer.To solve the above problems, the technical scheme that the present invention takes is：A kind of multiphase bridge flows again
Formula PWM isolated DC translation circuit, including multichannel controlled bridge arm, multiple isolating transformers, multigroup fast recovery diode, it is described
Controlled bridge arm way it is identical with the number of phases of multiphase bridge with the quantity of isolating transformer, fast recovery diode group number, it is described
Isolating transformer former limit adopt end to end connected mode, isolating transformer secondary adopt Y-connection mode；Controllable bridge
Arm includes the first device for power switching and the second device for power switching, and the emitter stage of the first device for power switching and the second power
The colelctor electrode of switching device, correspondence isolating transformer former limit input are connected, the first power switch device in all controlled bridge arms
The colelctor electrode of part connects the positive input terminal of input power, the emitter stage connection of the second device for power switching in all controlled bridge arms
The negative input end of input power；The anode of each corresponding first fast recovery diode of isolating transformer secondary output termination
With the negative electrode of the second fast recovery diode, all negative electrodes of the first fast recovery diode are connected with one end of output inductor,
The other end of output inductor is connected with the positive pole of output filter capacitor, used as the positive pole of direct current output；All second is fast extensive
The negative pole that the anode of multiple diode is connected as direct current output with the negative pole of output filter capacitor.
The scheme of multiphase DC translation circuit is to employ many bridge arm modes, such as three-phase bridge, Si Xiangqiao, six phase bridges etc.
Multiphase bridge.Odd number, even number can work, but the work of even number bridge arm is more balanced.The number of phases of multiphase bridge is 2N, wherein
N is the integer not less than 2.
The drive signal on the first device for power switching on all Odd Phases controlled bridge arms is identical, and all Odd Phases are controllable
The drive signal on the second device for power switching on bridge arm is identical, the first power switch device on all even number phase controlled bridge arms
Drive signal on part is identical, and the drive signal on the second device for power switching on all even number phase controlled bridge arms is identical, together
The first device for power switching and the second device for power switching complementary duty on one controlled bridge arm；On Odd Phases controlled bridge arm
The service time of the first device for power switching is identical with the service time of the first device for power switching on even number phase controlled bridge arm
And respectively less than half period.
As shown in figure 3, described device for power switching include a full-controlled device, an anti-paralleled diode and one with
Full-controlled device resonant capacitance in parallel.
When each device for power switching works, while having a device for power switching that it intersects on bridge arm work simultaneously
Make, realize " parallel connection " of power device, the current stress of each device for power switching is reduced to original half.
Device for power switching does not have real parallel connection, so the switch caused by drive circuit or device itself difference
Speed, switch time delay, impedance distribution etc. will not cause the pernicious damage of device for power switching.
Operationally, 2N isolating transformer works isolating transformer simultaneously, and the electric current on each isolating transformer is defeated
2N/mono- for going out electric current.Isolating transformer only need to be designed according to 2N/mono- power of rated capacity, greatly reduce
The complexity of transformer technique, beneficial to design of transformer and realization.
Patent of the present invention has the advantage that compared with traditional circuit：Single device for power switching current stress reduce (with
As a example by four phase bridges, current stress is reduced to original half)；Device for power switching, without directly in parallel, is not in pernicious damage
It is bad；High-frequency isolation transformer power reduction, reduces and realizes difficulty.
Description of the drawings
Fig. 1 is that four phase bridge PWM isolated DCs convert main circuit；
Fig. 2 is that six phase bridge PWM isolated DCs convert main circuit；
Fig. 3 is device for power switching；
Fig. 4 is the four phase bridge PWM isolated DC translation circuit courses of work；
Fig. 5 is the relation of output voltage and dutycycle.
Specific embodiment
Embodiment one：
Four phase bridge PWM isolated DCs conversion main circuit is illustrated in figure 1, by square-star high frequency transformer isolation.
Including eight device for power switching VT1, VT2, VT3, VT4, VT5, VT6, VT7, VT8, four high frequency transformer T1, T2, T3,
T4, eight fast recovery power diode D1, D2, D3, D4, D5, D6, D7, D8, an output inductor Lo and an output filter
Ripple electric capacity Co.Wherein, four high frequency transformer T1, T2, T3, T4 former limits join end to end with square connected mode, and four high frequencies become
Depressor T1, T2, T3, T4 secondary is in Y-connection mode.First bridge arm：The emitter stage and second of the first device for power switching VT1
The colelctor electrode of device for power switching VT2, high frequency transformer T1, the tie point of high frequency transformer T4 are connected in point A；Second bridge arm：
The colelctor electrode of the emitter stage of the first device for power switching VT3 and the second device for power switching VT4, high frequency transformer T1, high frequency become
The tie point of depressor T2 is connected in point B；3rd bridge arm：The emitter stage of the first device for power switching VT5 and the second power switch device
The colelctor electrode of part VT6, high frequency transformer T2, the tie point of high frequency transformer T3 are connected in point C；Four bridge legs：First power is opened
Close the emitter stage of device VT7 and colelctor electrode, high frequency transformer T3, the company of high frequency transformer T4 of the second device for power switching VT8
Contact is connected in point D.Input is accessed after the colelctor electrode connection of first device for power switching VT1, VT3, VT5, VT7 of four bridge arms
The positive input terminal of power supply；Access after the emitter stage connection of second device for power switching VT2, VT4, VT6, VT8 of four bridge arms defeated
Enter the negative input end of power supply.The two ends of described input power are parallel with filter capacitor Cd.First fast recovery power diode D1
The anode negative electrode for recovering power diode D2 fast with second, high frequency transformer T1 secondary is connected；First fast recovery power two pole
The anode of pipe D3 is connected with the second fast negative electrode for recovering power diode D4, high frequency transformer T2 secondary；First fast recovery power
The anode of diode D5 is connected with the second fast negative electrode for recovering power diode D6, high frequency transformer T3 secondary；First fast recovery
The anode of power diode D7 is connected with the second fast negative electrode for recovering power diode D8, high frequency transformer T4 secondary；First is fast
The one end for recovering the connected rear and output inductor Lo of negative electrode of power diode D1, D3, D5, D7 is connected in point m.Output filtering
The other end of inductance Lo is connected with the positive pole of output filter capacitor Co, used as the positive pole of direct current output.Second fast recovery power two
The negative pole of the connected rear and output filter capacitor Co of pole pipe D2, D4, D6, D8 positive pole is connected in point n, used as the negative pole of direct current output.
Then the course of work that four phase bridge PWM isolated DCs convert main circuit is analyzed.For analysis simplify, do with
Lower hypothesis.The equal noninertia of all switching devices in circuit, on off state equal moment that alternates completes.Output filter capacitor Co is enough
Greatly, ripple-free occurs.Output inductor Lo is sufficiently large, electric current linear change.High frequency transformer no-load voltage ratio is 1:1.Direct current is input into
Voltage is Ed, and load current Io is I.
As shown in figure 4, the drive signal of eight device for power switching VT1, VT2, VT3, VT4, VT5, VT6, VT7, VT8 point
Wei not Ug1, Ug2, Ug3, Ug4, Ug5, Ug6, Ug7, Ug8.Wherein drive signal Ug1, Ug5 signals are identical, while opening simultaneously
Close；Drive signal Ug3, Ug7 signal is identical；Drive signal Ug2, Ug6 signal is identical；Drive signal Ug4, Ug8 signal is identical.
Drive signal Ug1, Ug2 signal is complementary；Drive signal Ug3, Ug4 signal is complementary.Drive signal Ug3, Ug1 signal high level time
Identical, the time is DT.Ug1 is high level initial time from signal period initial time, and Ug3 is then high electricity from moment half period
Flat initial time.Wherein, the cycle time of drive signal is T, DT<T/2.D is the dutycycle of signal.
Four phase bridge pwm circuits can be divided into four kinds of different working conditions in one complete cycle, t0～t1, t1～t2,
T2～t3, t3～t0.
T0～t1：Device for power switching VT1, VT4, VT5, VT8 drive signal Ug1, Ug4, Ug5, Ug8 be high level, work(
Rate switching device VT2, VT3, VT6, VT7 drive signal Ug2, Ug3, Ug6, Ug7 are low level, and the potential of A, B, C, D point is distinguished
For Ed (DC input voitage), 0, Ed, 0；Voltage UAB, UCD are positive level, and amplitude is Ed, and voltage UBC, UDA are negative electricity open width
It is worth for-Ed.After high frequency transformer isolation, transformer secondary voltage Uao, Uco are positive level, and amplitude is Ed；Transformer pair
Polygonal voltage Ubo, Udo is negative level, and amplitude is-Ed.Voltage Uab, Ucd are positive level, and amplitude is 2Ed.Voltage Ubc, Uda are negative
Level, amplitude is -2Ed.Voltage Umn is positive level, and amplitude is 2Ed.First bridge arm average current IA, the 3rd bridge arm average current
IC is I, and the second bridge arm average current IB, four bridge legs average current ID are-I.High frequency transformer secondary current I.Output filtering
Inductance Lo electric currents IL increases, and average current is I.
T1～t2：Device for power switching VT2, VT4, VT6, VT8 drive signal Ug2, Ug4, Ug6, Ug8 be high level, work(
Rate switching device VT1, VT3, VT5, VT7 drive signal Ug1, Ug3, Ug5, Ug7 are low level, and the potential of A, B, C, D point is all
0；Voltage UAB, UBC, UCD, UDA are zero level.Through high frequency transformer isolation after, transformer secondary voltage Uao, Ubo, Uco,
Udo is zero level；Voltage Uab, Ubc, Ucd, Uda are zero level.Voltage Umn is zero level.IA, IB, IC, ID are for 0 (for side
Just analyze, do not consider that sense is acted on).Fast recovery diode is turned on, and transformer secondary is by fast recovery diode short circuit, transformer secondary
Electric current is 0.Output inductor Lo electric currents IL reduces, and average current is I.
T2～t3：Device for power switching VT2, VT3, VT6, VT7 drive signal Ug2, Ug3, Ug6, Ug7 be high level, work(
Rate switching device VT1, VT4, VT5, VT8 drive signal Ug1, Ug4, Ug5, Ug8 are low level, and the potential of A, B, C, D point is distinguished
For 0, Ed, 0, Ed；Voltage UBC, UDA are positive level, and amplitude is Ed, and it is-Ed that voltage UAB, UCD are negative level amplitude.Through height
After frequency power transformer isolation, transformer secondary voltage Ubo, Udo are positive level, and amplitude is Ed；Transformer secondary voltage Uao, Uco are
Negative level, amplitude is-Ed.Voltage Ubc, Uda are positive level, and amplitude is 2Ed.Voltage Uab, Ucd be negative level, amplitude for-
2Ed.Voltage Umn is positive level, and amplitude is 2Ed.IA, IC average current is-I, and IB, IC average current is I.Output inductor
Lo electric currents IL increases, and average current is I.
T3～t0：Device for power switching VT1, VT3, VT5, VT7 drive signal Ug1, Ug3, Ug5, Ug7 be high level, work(
Rate switching device VT2, VT4, VT6, VT8 drive signal Ug2, Ug4, Ug6, Ug8 are low level, and the potential of A, B, C, D point is all
Ed；Voltage UAB, UBC, UCD, UDA are zero level.Through high frequency transformer isolation after, transformer secondary voltage Uao, Ubo,
Uco, Udo are zero level；Voltage Uab, Ubc, Ucd, Uda are zero level.Voltage Umn is zero level.Voltage Umn is zero level.
IA, IB, IC, ID are 0.Fast recovery diode is turned on, and transformer secondary is by fast recovery diode short circuit, transformer secondary side current
For 0.Output inductor Lo electric currents IL reduces, and average current is I.
PWM waveform Umn is obtained through the work of an actual whole cycle, voltage Umn is in t0～t1, t2～t3 time periods
High level, amplitude is 2Ed, and voltage Umn is zero level in t1～t2, t3～t0 time periods.
The PWM waveform of Umn obtains VD after output inductor Lo, output inductor Co filtering
Uo.Uo amplitudes are about 2D*Ed.By the size for changing dutycycle D, realize that PWM mode adjusts the purpose of output voltage Uo.As schemed
It is the relation of output voltage and dutycycle shown in 5.Wherein, maximum output voltage Um is determined by transformer voltage ratio and input voltage Ed
It is fixed.
According to job analysis in the case where transformer magnetizing current is not considered, the operating current IA of four bridge arms,
The average current of IB, IC, ID is about I (I is load current).
The DC power supply of 90KW is realized according to the four phase bridge PWM isolated DCs conversion main circuit of present invention design.
Power supply obtains high voltage dc bus voltage as the input of PWM DC converters by commercial power rectification.Transformer voltage ratio in design
Using 2:1, rated output voltage is 270V, and output-current rating reaches 330A, and designs with 150% overload capacity.
Embodiment two：
Be illustrated in figure 2 six phase bridge PWM isolated DCs conversion main circuit, by hexagon-star high frequency transformer every
From.Including 12 device for power switching VT1, VT2, VT3, VT4, VT5, VT6, VT7, VT8, VT9, VT10, VT11, VT12, six
Individual high frequency transformer T1, T2, T3, T4, T5, T6,12 fast recover power diode D1, D2, D3, D4, D5, D6, D7, D8, D9,
D10, D11, D12, an output inductor Lo and an output filter capacitor Co.First bridge arm：First device for power switching
The emitter stage of VT1 is connected with the colelctor electrode of the second device for power switching VT2, the tie point of high frequency transformer T1, T6；Second bridge
Arm：The colelctor electrode of the emitter stage of the first device for power switching VT3 and the second device for power switching VT4, high frequency transformer T1, T2
Tie point is connected；3rd bridge arm：The colelctor electrode of the emitter stage of the first device for power switching VT5 and the second device for power switching VT6,
The tie point of high frequency transformer T2, T3 is connected；Four bridge legs：The emitter stage of the first device for power switching VT7 is opened with the second power
Close the colelctor electrode of device VT8, the tie point of high frequency transformer T3, T4 to be connected；5th bridge arm：First device for power switching VT9's
Emitter stage is connected with the colelctor electrode of the second device for power switching VT10, the tie point of high frequency transformer T4, T5；6th bridge arm：The
The colelctor electrode of the emitter stage of one device for power switching VT11 and the second device for power switching VT12, the company of high frequency transformer T5, T6
Contact is connected.Input power is accessed after the colelctor electrode connection of first device for power switching VT1, VT3, VT5, VT7, VT9, VT11
Positive input terminal；Input power is accessed after the emitter stage connection of second device for power switching VT2, VT4, VT6, VT8, VT10, VT12
Negative input end.The first fast anode for recovering power diode D1 and the second fast negative electrode for recovering power diode D2, high frequency become
Depressor T1 secondary connects；The first fast anode for recovering power diode D3 and the second fast negative electrode, height for recovering power diode D4
Frequency power transformer T2 secondary connects；The first fast anode for recovering power diode D5 and second fast the moon for recovering power diode D6
Pole, the connection of high frequency transformer T3 secondary；The first fast anode for recovering power diode D7 and the second fast recovery power diode D8
Negative electrode, high frequency transformer T4 secondary connection；The first fast anode for recovering power diode D9 and the second fast recovery power two pole
The negative electrode of pipe D10, the connection of high frequency transformer T5 secondary；The first fast anode for recovering power diode D11 and the second fast recovery work(
The negative electrode of rate diode D12, the connection of high frequency transformer T6 secondary.First fast recovery power diode D1, D3, D5, D7, D9, D11
Negative electrode be connected after be connected with one end of output inductor Lo.The other end of output inductor Lo and output filter capacitor Co
Anode be connected, as the positive pole of direct current output.Second fast power diode D2, D4, D6, D8, D10, D12 anode that recovers is connected
It is connected with the negative pole of output filter capacitor Co afterwards, as the negative pole of direct current output.
Claims (5)
1. a kind of multiphase bridge times streaming PWM isolated DC translation circuit, it is characterised in that：Including multichannel controlled bridge arm, multiple
Isolating transformer, multigroup fast recovery diode, the way of described controlled bridge arm and the quantity of isolating transformer, fast recover two poles
Pipe group number is identical with the number of phases of multiphase bridge, and described isolating transformer former limit adopts end to end connected mode, isolation to become
Depressor secondary adopts Y-connection mode；Controlled bridge arm includes the first device for power switching and the second device for power switching, and the
The emitter stage of one device for power switching and the colelctor electrode of the second device for power switching, corresponding isolating transformer former limit input phase
Even, the colelctor electrode of the first device for power switching in all controlled bridge arms connects the positive input terminal of input power, all controllable bridges
The emitter stage of the second device for power switching in arm connects the negative input end of input power；Each isolating transformer secondary output end
Connect the anode of corresponding first fast recovery diode and the negative electrode of the second fast recovery diode, all first two poles of fast recovery
The negative electrode of pipe is connected with one end of output inductor, the other end of output inductor and the positive pole phase of output filter capacitor
Even, as the positive pole of direct current output；All anodes of the second fast recovery diode are connected conduct with the negative pole of output filter capacitor
The negative pole of direct current output.
2. a kind of multiphase bridge times streaming PWM isolated DC translation circuit according to claim 1, it is characterised in that：It is many
The number of phases of phase bridge is 2N, and wherein N is the integer not less than 2.
3. a kind of multiphase bridge times streaming PWM isolated DC translation circuit according to claim 2, it is characterised in that：Institute
There is the drive signal on the first device for power switching on Odd Phases controlled bridge arm identical, on all Odd Phases controlled bridge arms
Drive signal on two device for power switching is identical, the driving on the first device for power switching on all even number phase controlled bridge arms
Signal is identical, and the drive signal on the second device for power switching on all even number phase controlled bridge arms is identical, same controllable bridge
The first device for power switching and the second device for power switching complementary duty on arm；The first power on Odd Phases controlled bridge arm is opened
The service time for closing device is identical with the service time of the first device for power switching on even number phase controlled bridge arm and be respectively less than partly
The individual cycle.
4. a kind of multiphase bridge times streaming PWM isolated DC translation circuit according to claim 2, it is characterised in that：Institute
The device for power switching stated includes full-controlled device, an anti-paralleled diode and one resonance electricity in parallel with full-controlled device
Hold.
5. a kind of multiphase bridge times streaming PWM isolated DC translation circuit according to claim 4, it is characterised in that：Institute
The two ends of the input power stated are parallel with filter capacitor.
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| CN201611042076.6A CN106655786A (en) | 2016-11-21 | 2016-11-21 | Multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit |
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| CN201611042076.6A CN106655786A (en) | 2016-11-21 | 2016-11-21 | Multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit |
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| CN109149951A (en) * | 2017-06-19 | 2019-01-04 | 南京航空航天大学 | A kind of Sofe Switch three-phase current type recommends DC converter |
| CN109149951B (en) * | 2017-06-19 | 2021-02-09 | 南京航空航天大学 | Soft-switching three-phase current type push-pull direct-current converter |
| CN113179008A (en) * | 2021-05-12 | 2021-07-27 | 阳光电源股份有限公司 | Multiphase LLC resonance DC/DC circuit |
| CN113179008B (en) * | 2021-05-12 | 2024-02-09 | 阳光电源股份有限公司 | Multiphase LLC resonance DC/DC circuit |
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Application publication date: 20170510 |