CN104578806B - Cascade bilateral soft switch DC/DC circuit topology - Google Patents

Cascade bilateral soft switch DC/DC circuit topology Download PDF

Info

Publication number
CN104578806B
CN104578806B CN201410836076.8A CN201410836076A CN104578806B CN 104578806 B CN104578806 B CN 104578806B CN 201410836076 A CN201410836076 A CN 201410836076A CN 104578806 B CN104578806 B CN 104578806B
Authority
CN
China
Prior art keywords
circuit
power switch
switch pipe
electrode
auxiliary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201410836076.8A
Other languages
Chinese (zh)
Other versions
CN104578806A (en
Inventor
万晓凤
谌新
余运俊
胡伟
康利平
郑博嘉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanchang University
Original Assignee
Nanchang University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanchang University filed Critical Nanchang University
Priority to CN201410836076.8A priority Critical patent/CN104578806B/en
Publication of CN104578806A publication Critical patent/CN104578806A/en
Application granted granted Critical
Publication of CN104578806B publication Critical patent/CN104578806B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H02M3/337—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 in push-pull configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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

Abstract

The invention discloses a cascade bilateral soft switch DC/DC circuit topology. The cascade bilateral soft switch DC/DC circuit topology comprises a preceding stage boosted circuit, an auxiliary circuit, a post-stage push pull transformer and a full-bridge circuit, which are connected in series in sequence, wherein the auxiliary circuit comprises a resonant inductor Lr, a resonant capacitor Cr2, an auxiliary switch VT2 containing an anti-parallel body diode VD2, fast recovery diodes VD9 and VD10, and a relay K; one end of the resonant inductor Lr is connected with the negative electrode of the fast recovery diode VD9; the other end of the resonant inductor Lr is respectively connected with the positive electrode of the fast recovery diode VD10 and the drain electrode of the auxiliary switch VT2; the source electrode of the auxiliary switch VT2 is connected with the anode of the fast recovery diode VD10; the negative electrode of the fast recovery diode VD10 is connected with one end of the relay K; the other end of the relay K is respectively connected with the negative electrode of the resonant capacitor Cr2 and the anode of the fast recovery diode VD9. The cascade bilateral soft switch DC/DC circuit topology is simple and reliable in control, simple in circuit structures, easy to realize, low in device cost, low in switch loss, low in voltage stress of the switch, high in conversion efficiency and low in circuit conduction loss.

Description

Cascade two-way Sofe Switch DC/DC circuit topology
Technical field
The invention belongs to electric vehicle engineering field, particularly to electric automobile circuit topology.
Technical background
The circuit topology of two-way DC/DC changer is generally divided into two classes at present：One class is non-isolation type, is mainly characterized by becoming Parallel operation structure is simple, small volume, and lightweight, power is little, efficiency high, but is only applicable to the field without electrical isolation for the low-power Close；Another kind of, it is isolated form, not only solve low-pressure side and on high-tension side electrical isolation by introducing transformator, and make The power of changer increases substantially, but large-power occasions often produce, and switching tube stress is big, switching loss serious, electro permanent magnetic Can be difficult to solve the problems such as difference.
Content of the invention
It is an object of the present invention to provide a kind of structure is simple, it is easy to accomplish, switching loss is few, and what device cost was low is applied to electricity The cascade two-way Sofe Switch DC/DC circuit topology of electrical automobile.
The present invention is achieved by the following technical solutions.
Of the present invention cascade two-way Sofe Switch DC/DC circuit topology, it include prime booster circuit, auxiliary circuit, Rear class push-pull transformer, full-bridge circuit, are sequentially connected in series between them.It is characterized in that described auxiliary circuit includes resonant inductance Lr, resonant capacitance Cr2, include inverse parallel body diode VD2Auxiliary switch VT2, fast recovery diode VD9、VD10, relay K；Wherein, resonant inductance LrOne end be connected in fast recovery diode VD9Negative electrode, resonant inductance LrThe other end respectively with resonance Electric capacity Cr2Positive pole, auxiliary switch VT2Drain electrode be connected, auxiliary switch VT2Source electrode and fast recovery diode VD10Sun Extremely connected, fast recovery diode VD10Negative electrode be connected in one end of relay K, the other end of relay K respectively with resonant capacitance Cr2Negative pole, fast recovery diode VD9Anode be connected.
Described prime booster circuit includes low-pressure side DC source uL, filter capacitor C1, boost inductance L1, include instead simultaneously Conjuncted diode VD1Main switch VT1, clamp capacitor Cr1；
Wherein, low-pressure side DC source uLPositive pole and boost inductance L1One end be connected, boost inductance L1The other end even In main switch VT1Drain electrode, main switch VT1Source electrode and low-pressure side DC source uLNegative pole be connected, filter capacitor C1Just To being parallel to low-pressure side DC source uL, clamp capacitor Cr1Forward direction is parallel to main switch VT1Hourglass source electrode, main switch VT1's Drain electrode is as the cathode output end of prime booster circuit, main switch VT1Source electrode as prime booster circuit negative pole export End.
Described auxiliary circuit includes resonant inductance Lr, resonant capacitance Cr2, include inverse parallel body diode VD2Auxiliary open Close pipe VT2, fast recovery diode VD9、VD10, relay K；
Wherein, resonant inductance LrOne end as the electrode input end of auxiliary circuit, be connected in the positive pole of prime booster circuit Outfan, resonant inductance LrThe other end respectively with resonant capacitance Cr2Positive pole, auxiliary switch VT2Drain electrode be connected, auxiliary Switching tube VT2Source electrode as auxiliary circuit negative input, respectively with the cathode output end of prime booster circuit, fast recover Diode VD10Anode be connected, fast recovery diode VD10Negative electrode be connected in one end of relay K, the other end of relay K divides Not and resonant capacitance Cr2Negative pole, fast recovery diode VD9Anode be connected, fast recovery diode VD9Negative electrode be connected in prime The cathode output end of booster circuit, and the cathode output end as auxiliary circuit, fast recovery diode VD10Anode as auxiliary The cathode output end of circuit.
Described rear class push-pull transformer includes including inverse parallel body diode VD3Power switch pipe VT3, include instead simultaneously Conjuncted diode VD4Power switch pipe VT4, former limit three port (two Same Name of Ends), the change of secondary two-port (Same Name of Ends) Depressor；
Wherein, the Same Name of Ends in the middle of transformer primary side is as the electrode input end of rear class push-pull transformer, with auxiliary circuit Cathode output end be connected, power switch pipe VT3Drain electrode be connected in another Same Name of Ends of transformer primary side, power switch pipe VT3's Source electrode is as the negative input of rear class push-pull transformer, cathode output end, the power switch pipe VT with auxiliary circuit respectively4's Source electrode is connected, power switch pipe VT4Drain electrode be connected in the non-same polarity of transformer primary side, power switch pipe VT3、VT4Partner Recommend switching tube, the Same Name of Ends of transformer secondary as the cathode output end of rear class push-pull transformer, transformer secondary non-with Name end is as the cathode output end of rear class push-pull transformer.
Described full-bridge circuit includes pulsactor L2, relay K, capacitance C2, include inverse parallel body diode VD5、 Output junction capacity C5Power switch pipe VT5, include inverse parallel body diode VD6, output junction capacity C6Power switch pipe VT6, Include inverse parallel body diode VD7, output junction capacity C7Power switch pipe VT7, include inverse parallel body diode VD8, output knot Electric capacity C8Power switch pipe VT8, filter capacitor C0, high-pressure side DC source uH；
Wherein, pulsactor L2One end as full-bridge circuit electrode input end, the positive pole with rear class push-pull transformer Outfan is connected, pulsactor L2The other end be connected in capacitance C2Positive pole, relay K is parallel to pulsactor L2, every straight Electric capacity C2Negative pole respectively with power switch pipe VT5Source electrode, power switch pipe VT7Drain electrode be connected, power switch pipe VT5's Drain electrode respectively with power switch pipe VT6Drain electrode, filter capacitor C0Positive pole, high-pressure side DC source uHPositive pole be connected, power Switching tube VT7Source electrode respectively with power switch pipe VT8Source electrode, filter capacitor C0Negative pole, high-pressure side DC source uHNegative Extremely connected, power switch pipe VT8Drain electrode as full-bridge circuit negative input, the negative pole with rear class push-pull transformer respectively Outfan, power switch pipe VT6Source electrode be connected, power switch pipe VT5、VT7The leading-bridge of composition full-bridge circuit, power is opened Close pipe VT5、VT7The lagging leg of composition full-bridge circuit.
The feature of the present invention and technique effect：
1st, all switching tubes in circuit are PWM control mode, and low pressure side drive circuit, without electrical isolation, controls letter Single reliable；
2nd, auxiliary circuit is only made up of a switching tube and simple passive device, and complexity substantially reduces, entirely electricity Line structure is simple, it is easy to accomplish, device cost is low；
3rd, all switching tubes in circuit all enable Sofe Switch, not only reduce switching loss, reduce switching tube Voltage stress, also effectively increases conversion efficiency；
4th, during boosting inverter, main switch VT1With recommend switching tube VT3、VT4Three's only one conducting at any time, And auxiliary switch VT2Working time extremely short, so the on-state loss of circuit is also less.
Brief description
Fig. 1 cascades two-way Sofe Switch DC/DC circuit topology for the present invention.
Fig. 2 is circuit topology during boosting inverter.
Fig. 3 is work wave during boosting inverter.
Circuit topology when Fig. 4 changes for blood pressure lowering buckling.
Fig. 5 is work wave during decompression transformation.
Specific embodiment
Referring to accompanying drawing 1, it is divided into liter to the two-way Sofe Switch DC/DC circuit topology of cascade of the present invention in actual applications Reversely operated state when positive working condition when buckling is changed and decompression transformation, when boosting inverter, high-pressure side DC source uHIts load form must be converted to, i.e. the impedance of motor；When decompression transformation, low-pressure side DC source uLLoad shape must be converted to Formula, i.e. the impedance of accumulator.For ease of understanding, its load form is made unloaded process by here unification.
With operation principle, the specific embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Specific boosting inverter principle is as described below.
When automobile is when starting, accelerating or climbing, controller cuts out high-pressure side VT5～VT8Drive signal, relay K closes Close, make pulsactor L2It is shorted, the auxiliary circuit of low-pressure side is switched on, referring to accompanying drawing 2.C2As capacitance, suppression boosting The magnetic bias effect of circuit.Low-pressure side voltage first passes through main switch VT1With boost inductance L1The booster circuit constituting boosts to necessarily Value, then push-pull transformer boosts again, finally by VD5～VD8Full-bridge rectification exports.
To simplify the analysis, do hypothesis below：All elements are perfect condition；Ignore the leakage inductance of transformator.Changer liter Referring to accompanying drawing 3, half period can be divided into 8 mode, the work process of second half of the cycle and first half to work wave when buckling is changed The individual cycle is essentially identical, simply changes to another and recommends the difference that pipe works, therefore half period before only introducing.
Mode 1 (t0～t1)：Make t0Before moment, switching tube VT1、VT2And VT4Turn off, VT3Conducting, system is in stable State, and booster circuit is through recommending pipe VT3Power is sent in full bridge rectifier.t0Moment, VT in auxiliary circuit2Electricity Stream IVT2It is zero, in LrIn the presence of VT2Realize ZCS open-minded.In this stage, flow through LrElectric current ILrStart from zero linear increase, and VT3Electric current IVT3It is gradually reduced.
In formula：uHFor changer high-pressure side both end voltage, uLFor changer low-pressure side both end voltage, n is transformer voltage ratio.
Mode 2 (t1～t2)：t1Moment, Lr、Cr1Between occur resonance, Cr1Electric discharge, ILrContinue to increase.Until t2Moment, Cr1Electric discharge is zero, IVT3Also drop to zero.ILrReach maximum, and be equal to L1Electric current IL1.
Mode 3 (t2～t3)：t2In the moment, resonance terminates, ILrThrough anti-paralleled diode VD1、VD3And VD4Conducting afterflow, this rank Section constant current hold.VT1It is zero because both end voltage is clamped, therefore can achieve that ZVS is open-minded；VT again3Electric current IVT3It has been zero, institute With VT3Enable ZCS to turn off.
Mode 4 (t3～t4)：t3Moment, ILrBecause of LrEffect can not sport zero, but LrAlmost share VT2All electricity Pressure, so in this VT in a flash1ZVS open to VT2There are no-voltage clamper, VT2Enable ZVS to turn off.This stage, By Lr、Cr2And VD9Form resonant tank, Cr2Start to charge up.Through a quarter harmonic period, i.e. t4Moment, ILrIt is zero, Cr2Fully charged.
Mode 5 (t4～t5)：C afterwardsr2Start to discharge, and and Lr、VT1、VD10Constitute resonant tank, ILrStart from scratch anti- Direction increases.t5Moment, Cr2Electric discharge is zero, LrThrough VT1、VD2Conducting afterflow, resonance terminates, persistent period and t34Equal.
Mode 6 (t5～t6)：This stage only has VT1One switching tube is conducting state, and auxiliary circuit quits work, low pressure Side battery is to L1Charge.
Mode 7 (t6～t7)：t6Moment, due to buffering electric capacity Cr1Voltage can not be mutated, VT1Achieve ZVS to turn off.And Cr1It is electrically charged, in boost inductance L1In the presence of, charging current IL1It is basically unchanged.Again because VT4Both end voltage by VD4Clamper It is zero, so VT1The VT when ZVS turns off4ZVS is open-minded immediately, is L1Freewheeling path is provided.
Mode 8 (t7～t8)：This stage is the work process of common booster converter, i.e. battery and boost inductance L1Jointly There is provided energy to high-pressure side.
Specific decompression transformation principle is as described below.
When automobile is when slowing down, braking or dallying, controller cuts out low-side switch pipe VT1～VT4Drive signal, continue Electrical equipment K disconnects, and makes pulsactor L2Seal in high-pressure side, auxiliary circuit does not work, referring to accompanying drawing 4.C5～C8Output for switching tube Junction capacity, switching tube VT5～VT8With the work of phase shift pattern, L2And C2Loading range can effectively be expanded and reduce secondary dutycycle and lose Lose, output is through diode VD3And VD4All wave rectification, filter inductance L1Realize the recycling of energy and to low-pressure side accumulator Charge.
To simplify the analysis it is assumed that as follows：All elements are perfect condition, and L1>>Llk/n2.During changer decompression transformation Work wave referring to accompanying drawing 5, upFor primary voltage of transformer, IpFor primary side current of transformer, urFor transformer secondary voltage, Half period can be divided into 6 mode, and the work process of second half of the cycle is full symmetric with front half period, therefore only introduces first half Cycle.
Mode 1 (t0～t1)：Order is in t0Before moment, switching tube VT5And VT8It is on, IpLinear rise, secondary two pole Pipe VD3And VD4It is both turned on, be in commutation course.t0In the moment, the change of current terminates, VD4Turn off, VT5And VT8Continue conducting, IpIt is right to start Electric capacity C2Charge, its voltage uc2Linear change.t1In the moment, turn off VT5, IpReach maximum.This stage has：
Mode 2 (t1～t2)：VT5Have no progeny in pass, shunt capacitance C5、C7With L2、Llk、L1There is resonance, C7Start to discharge, C5Fill Electricity, IpThen from VT5Transfer to C5、C7In.
Due to L1Relatively sufficiently large, I can be approximately consideredp=Io/ n is invariable, IoFor secondary side output current.uc7In Ip In the presence of linear decline,
U is understood by formula (10)pWith uc7Constantly decline and reduce, until t2Moment uc7=0, IpStart through inverse parallel two pole Pipe VD7Conducting afterflow.
Mode 3 (t2～t3)：t2Moment, due to VD7Conducting, switching tube VT7Voltage clamp be zero it is achieved that ZVS is open-minded.
Mode 4 (t3～t4)：t3Moment, VT8In shunt capacitance C6、C8Cushioning effect under ZVS turn off.Hereafter, former limit electricity Stream IpWith secondary current IoAll begin to decline.Work as IoLess than output inductor electric current IL1When, IL1In unnecessary electric current to VD4Stream Dynamic.In commutation course, commutation diode VD3And VD4Simultaneously turn on, both sides voltage is all zero, and transformator is equivalent to short circuit, therefore The C of primary side6、C8With Llk、L2There is resonance, C8Charge, C6Electric discharge.
I is understood by formula (12)pEver-reduced simultaneously, uc8Constantly increase.Until t4Moment, Ip=0, then
Mode 5 (t4～t5)：t4Moment, diode VD6Conducting afterflow.C2Polarity of voltage because with IpIdentical and become reverse Blocking voltage source, L2Exit saturation, hinder IpInversely increase so as to maintain zero state.Thus switching tube VT6Realize ZCS Open-minded.Until t5Moment, diode VD6And VD7Naturally turn off, IpStart to inversely increase.
Mode 6 (t5～t6)：t6Moment, IpReach reverse maximum, diode VD3In electric current drop to zero and turn off, Electric current IL1It is transferred completely into VD4In, commutation course terminates.
For realizing embodiments of the invention, will be made furtherly by following Sofe Switch condition analysiss and parameter designing Bright.
The Sofe Switch condition of boosting inverter is as follows.
In order to realize VT1ZVS open-minded, Cr1The voltage at two ends can not rise too fast, i.e. t >=toff, typically take (2～3) toff(toffFor main switch VT1Turn-off time), Cr1Following condition need to be met：
uH/ucr1=n (14)
In formula：ImaxFor maximum input average current, can be obtained by formula (14)：
In order to not affect working method and the auxiliary switch VT of booster circuit PWM2Sofe Switch it is necessary to VT2Work Time is limited, i.e. t0～t3Time period is unsuitable long, is usually no more than 10% switch periods, therefore resonant inductance LrNeed to expire Foot：
In formula：T2For VT2Switch periods.Additionally, VT1Realize ZVS to turn off, that t3～t5The resonant process of time period must C must be ensuredr2Electric discharge is zero, therefore resonant capacitance Cr2Then need to meet：
The Sofe Switch condition of decompression transformation is as follows.
In order to realize the ZVS of leading-bridge switching tube, the primary voltage of transformator should drop to zero in Dead Time.Institute With switching tube VT5And VT7ZVS only need switching tube conducting with turn off time interval be more than t '12?：
For the ZCS of lagging leg switching tube, then require to be stored in pulsactor L2With blocking capacitor C2In energy enough Primary side current of transformer is made to be reset to zero.So：
And the duty-cycle loss time should meet following formula：
The parameter designing of circuit topology is as follows.
(1) number of turn of transformator and no-load voltage ratio：High side voltage ripple is taken within 10%, then transformer primary during decompression transformation The umber of turn N on sidep：
In formula：KfRepresent form factor, typically take 4.44 (sine waves) or 4 (square waves)；fsFor opening of phase-shifting full-bridge switching tube Close frequency；BmFor maximum magnetic induction density；AeAmass for core center column section；η represents conversion efficiency, takes 0.9；δ is current in wire Bulkfactor, generally 2.0A/mm2；KmFor the copper activity coefficient of magnetic core window, take 0.5；KcFor iron space factor, take 1；PT For rated power.In view of the duty-cycle loss problem of phase-shifted full-bridge converter, first assume secondary maximum duty cycle DmaxFor 0.9, Then secondary requires the minimum voltage u of outputsminFor：
In formula：uomaxFor secondary maximum output voltage；vDFor rectifier tube forward voltage drop；vL1Direct current pressure for filter inductance Fall.Turn ratio n of transformator is：
In formula：Δv1For total pressure drop such as the switching tube of transformer primary side, pulsactor and capacitance.Therefore draw transformation The umber of turn N of device secondarys=Np/n.Additionally, transformer parameter must also meet boosting inverter, booster circuit is made to complete once The input voltage value of boosting is uin, output voltage values are uo, relation is as follows：
uo=2nuinDT(25)
In formula：DTFor recommending the dutycycle of pipe.Make the tube voltage drop of circuit during boosting inverter, electric capacity pressure drop, winding pressure drop etc. For Δ v2, verification method is regarded as in uinWhen minimum, obtain required output voltage and just can meet the boosting under either case No-load voltage ratio relation, is deduced by formula (15)：
(2) boost inductance L1：In booster circuit, boost inductance directly determines the ripple Δ I of input currentLSize.When Boosting output is maximum, when input voltage is minimum, Δ ILMaximum, L1Value also maximum.
In formula：TsFor main switch VT1Switch periods.Due to L1Filter inductance to be made in blood pressure lowering, so also needing to consider Inductance value during blood pressure lowering.During blood pressure lowering, output circuit is full-wave rectifying circuit, therefore secondary current ripple frequency is primary side switch pipe 2 times.Relation is as follows：
So convolution (18), (19) consider the value that can obtain L1.
(3) filter capacitor C0、C1：In order to meet the requirement of commutating voltage and low-and high-frequency ripple, typically take the friendship of output voltage Flow liner ripple Δ v0=50mv.During boosting inverter, output eliminates filter inductance, only passes through C0Filter ripple.If capacitance current is The 20% of output current, then have：
During decompression transformation, it is output as all wave rectification, have：
(4) pulsactor L2：In order to realize the ZVZCS of phase-shifting full-bridge, L2High-frequency loss and radiating all can be larger, so L2Voltagesecond product need not design too high, such duty-cycle loss is with regard to very little.Solution formula is as follows：
In formula：D, T are respectively dutycycle and the switch periods of lagging leg switching tube, and Δ T opens for two in lagging leg Close the time interval of pipe turn-on and turn-off.
(5) capacitance C2：Can not possibly disappear completely because the output pulse width of changer is inconsistent, feedback circuit is asymmetric etc. Remove, so bias phenomenon certainly exists, and during boosting inverter push-pull configuration magnetic bias even more serious.When here takes boosting inverter Capacitance.
In sum, the circuit parameter of embodiment is defined below.
uL=24V, uH=380V, PT=3.5KW, fs=50KHZ, n=5, L1=100uH, L2=560uH, Lr=25uH, Llk=11uH, C0=100uF, C1=298uF, C2=0.47uF, Cr1=47nF, Cr2=220nF.

Claims (4)

1. a kind of two-way Sofe Switch DC/DC circuit topology of cascade, recommends transformation including prime booster circuit, auxiliary circuit, rear class Device, full-bridge circuit, are sequentially connected in series between them, it is characterized in that described auxiliary circuit includes resonant inductance Lr, resonant capacitance Cr2, Include inverse parallel body diode VD2Auxiliary switch VT2, fast recovery diode VD9、VD10, the first relay K；Wherein, resonance Inductance LrOne end as the electrode input end of auxiliary circuit, be connected in the cathode output end of prime booster circuit, resonant inductance Lr's The other end respectively with resonant capacitance Cr2Positive pole, auxiliary switch VT2Drain electrode be connected, auxiliary switch VT2Source electrode conduct The negative input of auxiliary circuit, cathode output end, the fast recovery diode VD with prime booster circuit respectively10Anode phase Even, fast recovery diode VD10Negative electrode be connected in one end of the first relay K, the other end of the first relay K respectively with resonance electricity Hold Cr2Negative pole, fast recovery diode VD9Anode be connected, fast recovery diode VD9Negative electrode be connected in prime booster circuit Cathode output end, and the cathode output end as auxiliary circuit, fast recovery diode VD10Anode as auxiliary circuit negative pole Outfan.
2. the two-way Sofe Switch DC/DC circuit topology of cascade according to claim 1, is characterized in that described prime rises piezoelectricity Road includes low-pressure side DC source uL, filter capacitor C1, boost inductance L1, include inverse parallel body diode VD1Main switch VT1, clamp capacitor Cr1；Wherein, low-pressure side DC source uLPositive pole and boost inductance L1One end be connected, boost inductance L1's The other end is connected in main switch VT1Drain electrode, main switch VT1Source electrode and low-pressure side DC source uLNegative pole be connected, filtering Electric capacity C1Forward direction is parallel to low-pressure side DC source uL, clamp capacitor Cr1Forward direction is parallel to main switch VT1Hourglass source electrode, master open Close pipe VT1Drain electrode as prime booster circuit cathode output end, main switch VT1Source electrode as prime booster circuit Cathode output end.
3. the two-way Sofe Switch DC/DC circuit topology of cascade according to claim 1, is characterized in that described rear class recommends change Depressor includes including inverse parallel body diode VD3Power switch pipe VT3, include inverse parallel body diode VD4Power switch pipe VT4, former limit three port, the transformator of secondary two-port；Wherein, the port in the middle of transformer primary side is as rear class push-pull transformer Electrode input end, the upper port with secondary is one group of Same Name of Ends, and is connected in the cathode output end of auxiliary circuit, transformer primary side The upper port of upper port and secondary be another group of Same Name of Ends, and be connected in power switch pipe VT3Drain electrode, power switch pipe VT3's Source electrode is as the negative input of rear class push-pull transformer, cathode output end, the power switch pipe VT with auxiliary circuit respectively4's Source electrode is connected, power switch pipe VT4Drain electrode be connected in the lower port of transformer primary side, power switch pipe VT3、VT4Partner and push away Draw switching tube, the upper port of transformer secondary is as the cathode output end of rear class push-pull transformer, the lower port of transformer secondary Cathode output end as rear class push-pull transformer.
4. the two-way Sofe Switch DC/DC circuit topology of cascade according to claim 1, is characterized in that described full-bridge circuit bag Include pulsactor L2, the second relay K, capacitance C2, include inverse parallel body diode VD5, output junction capacity C5Power open Close pipe VT5, include inverse parallel body diode VD6, output junction capacity C6Power switch pipe VT6, include inverse parallel body diode VD7, output junction capacity C7Power switch pipe VT7, include inverse parallel body diode VD8, output junction capacity C8Power switch pipe VT8, filter capacitor C0, high-pressure side DC source uH；Wherein, pulsactor L2One end as full-bridge circuit electrode input end, It is connected with the cathode output end of rear class push-pull transformer, pulsactor L2The other end be connected in capacitance C2Positive pole, second continues Electrical equipment K is parallel to pulsactor L2, capacitance C2Negative pole respectively with power switch pipe VT5Source electrode, power switch pipe VT7 Drain electrode be connected, power switch pipe VT5Drain electrode respectively with power switch pipe VT6Drain electrode, filter capacitor C0Positive pole, high pressure Side DC source uHPositive pole be connected, power switch pipe VT7Source electrode respectively with power switch pipe VT8Source electrode, filter capacitor C0 Negative pole, high-pressure side DC source uHNegative pole be connected, power switch pipe VT8Drain electrode as full-bridge circuit negative input, Cathode output end, power switch pipe VT with rear class push-pull transformer respectively6Source electrode be connected, power switch pipe VT5、VT7Composition The leading-bridge of full-bridge circuit, power switch pipe VT5、VT7The lagging leg of composition full-bridge circuit.
CN201410836076.8A 2014-12-29 2014-12-29 Cascade bilateral soft switch DC/DC circuit topology Expired - Fee Related CN104578806B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410836076.8A CN104578806B (en) 2014-12-29 2014-12-29 Cascade bilateral soft switch DC/DC circuit topology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410836076.8A CN104578806B (en) 2014-12-29 2014-12-29 Cascade bilateral soft switch DC/DC circuit topology

Publications (2)

Publication Number Publication Date
CN104578806A CN104578806A (en) 2015-04-29
CN104578806B true CN104578806B (en) 2017-02-22

Family

ID=53094190

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410836076.8A Expired - Fee Related CN104578806B (en) 2014-12-29 2014-12-29 Cascade bilateral soft switch DC/DC circuit topology

Country Status (1)

Country Link
CN (1) CN104578806B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106452088B (en) * 2016-11-18 2019-02-01 佛山市新光宏锐电源设备有限公司 A kind of isolation type bidirectional DC-DC converting means and its control method
CN110138011B (en) * 2019-06-05 2020-06-30 合肥工业大学 Module power balance control method of cascaded photovoltaic solid-state transformer
CN110380620B (en) * 2019-06-17 2024-03-19 嘉善中正新能源科技有限公司 Inverter circuit for high-power vehicle-mounted bidirectional DC
CN110190659B (en) * 2019-07-05 2024-01-26 西南交通大学 High-voltage pulse capacitor charging device
CN114337253B (en) * 2021-12-30 2023-05-05 电子科技大学 DC-DC converter with expandable high transformation ratio

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1395359A (en) * 2001-06-29 2003-02-05 三垦电气株式会社 Switching power supply device
CN201639842U (en) * 2009-12-31 2010-11-17 浙江工业大学 Electric driving device for high pressure gas discharge lamp
CN104040860A (en) * 2011-11-17 2014-09-10 通用电气公司 LED Power Source With Over-voltage Protection

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7218541B2 (en) * 2004-07-21 2007-05-15 Dell Products L.P. High efficiency two stage inverter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1395359A (en) * 2001-06-29 2003-02-05 三垦电气株式会社 Switching power supply device
CN201639842U (en) * 2009-12-31 2010-11-17 浙江工业大学 Electric driving device for high pressure gas discharge lamp
CN104040860A (en) * 2011-11-17 2014-09-10 通用电气公司 LED Power Source With Over-voltage Protection

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
A Zero Voltage Transition Boost Converter Employing a Soft Switching Auxiliary Circuit With Reduced Conduction Losses;Nikhil Jain et al.;《IEEE TRANSACTIONS ON POWER ELECTRONICS》;20040131;第19卷(第1期);全文 *
Isolated DC-DC Converters With High-Output Voltage for TWTA Telecommunication Satellite Applications;Ivo Barbi et al.;《IEEE TRANSACTIONS ON POWER ELECTRONICS》;20030731;第18卷(第4期);全文 *

Also Published As

Publication number Publication date
CN104578806A (en) 2015-04-29

Similar Documents

Publication Publication Date Title
CN108448913B (en) Single-stage isolated AC-DC converter based on staggered parallel bridgeless PFC circuit and LLC resonance
CN108512431B (en) Double rectification alternating expression full-bridge single stage power factor correction power circuits and control method
CN109217681B (en) Bidirectional resonant converter
CN103812317B (en) Clamp absorbing circuit and impedance control method thereof
CN106685231B (en) A kind of primary side clamper type soft switch full bridge converter and its asymmetric control method
CN105141138B (en) A kind of voltage-multiplying type Sofe Switch type recommends DC converter
CN104578806B (en) Cascade bilateral soft switch DC/DC circuit topology
CN105305829B (en) The unidirectional DC DC converters of current mode and symmetric double PWM add phase-shifting control method
CN110034683B (en) LLC converter modulation method capable of realizing natural bidirectional power flow
CN104104252B (en) The double Boost inverters of single-stage lifting press and its control method
WO2023098218A1 (en) Wide-range resonant soft-switching bidirectional direct-current converter, and control method therefor
CN103904901A (en) Phase-shift full-bridge converter circuit and control method
CN106100344A (en) A kind of LLC resonant converter with liter high voltage gain
CN103997238A (en) Half-cycle modulation method for double-Boost inverter
CN106787775A (en) A kind of bidirectional, dc converter and its control method
CN114301300A (en) Wide-range bidirectional resonant soft-switching direct-current converter and control method thereof
CN115694203B (en) DC isolated converter capable of bidirectional conversion and control method thereof
CN217087777U (en) Wide-range resonant soft-switching bidirectional direct-current converter
CN106533181A (en) Double transformer parallel series LLC resonant DC-DC converter and control method of the same
CN105720826A (en) Hybrid bridge type double-voltage rectification and output parallel single-stage inverter
CN109586583B (en) Soft switch current feed push-pull type DC-DC converter
CN112350583A (en) Current type push-pull bridge type soft switching bidirectional direct current converter
CN109889043B (en) Efficient pulse power supply for corona discharge method plasma sewage treatment system
CN210075085U (en) Superconducting magnet power supply controlled by soft switch
CN107171563A (en) The combined converter of tight adjustment output

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20170222

Termination date: 20201229