CN101355305B - Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor - Google Patents

Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor Download PDF

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CN101355305B
CN101355305B CN2008101209752A CN200810120975A CN101355305B CN 101355305 B CN101355305 B CN 101355305B CN 2008101209752 A CN2008101209752 A CN 2008101209752A CN 200810120975 A CN200810120975 A CN 200810120975A CN 101355305 B CN101355305 B CN 101355305B
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double tube
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CN101355305A (en
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陈威
张伟
吕征宇
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The present invention discloses a multifunctional double tube forward-flyback DC converter with an active clamp variable structure, comprising a DC power supply, a DC/DC conversion circuit consisting of three switching tubes, a insulating transformer, a rectifier circuit consisting of four diodes and two multicutter multithrow switches and a shorting bar, and a output filter capacitor. Based on that the primary side of a transformer is a forward-flyback conversion circuit, the circuit can realize the interconversion of two different rectifier circuits on the secondary side by the control of the multicutter multithrow switch and the shorting bar, thereby obtaining a DC converter with two different functions according to the difference of the input voltage range. The converter is characterized in that the converter automatically adjusts the topology according to the variation of the intensity of the input voltage so as to realize current conversion with the optimal circuit topology, enables the duty ratio be to relatively constant, improves the integral efficiency of the converter at all input voltage range, effectively reduces the redundancy of the system elements, and reduces the cost.

Description

The multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor
Technical field
The present invention relates to a kind of DC convertor, especially a kind of double tube positive and negative sharp DC current transformer that is applicable to the active-clamp variable topological structure of wide region input occasion.
Background technology
Practical application in industry tends to require power-supply device to have the compatible ability to work of wide-range voltage input.For example extensively being present in the Universal line characteristic in the notebook adapter, promptly is that the requirement adapter all can operate as normal under two kinds of input ranges of 110V/60Hz and 220V/50Hz.But under the voltage input environment of wide region (more than or equal to 2 times) like this, the effective duty ratio of its work also will change so wide scope thereupon by the input-output characteristic of common PWM type power supply as can be known.And because big RMS current value, high switching loss that narrower duty ratio causes and all drawbacks such as EMI characteristic degradation of bringing, all are comparable mainly keeping in check when influencing under the wide region initial conditions single topology characteristic can't be imported with low pressure under the high pressure input, cause the obstacle that to go beyond often also for simultaneously the optimal design of circuit elements device parameters.At present, propose to utilize two kinds respectively at different input voltage ranges and the power module of piecemeal design is formed the power-supply device that a cover is suitable for the wide-range voltage input, promote the power supply characteristic of gamut voltage under importing to satisfy the demand by the scholar.But this scheme has big not enough on cost advantage, because of the components and parts part/all redundancy will cause the very big decline and the device waste of power supply cost performance, and, be not the solution that best wide-range voltage is imported power-supply device along with the stability that increases system of components and parts also descends simultaneously.Therefore, topology or topology collection that how research is only adopted the circuit kit device and can effectively be realized optimizing at subregion input voltage circuit performance, promptly becoming effective solution thinking of wide-range voltage input power supply, is an integrated important composition aspect of power electronic system.
Summary of the invention
The purpose of this invention is to provide a kind of the have suitable wide region input of variable topological function, the multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor of high efficiency output.
Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor of the present invention, it comprises:
1) direct-current input power supplying is used to provide direct voltage;
2) DC-to-DC change-over circuit, be used for the dc constant voltage type voltage transitions of described input is become the impulse type direct voltage, comprise first main switch, second main switch and clamping diode, the drain electrode of first main switch links to each other with the positive pole of direct-current input power supplying, source electrode links to each other with the negative electrode of clamping diode, and the source electrode of second main switch links to each other with the anode of the negative pole of direct-current input power supplying and clamping diode;
3) active clamping circuir is used for transformer is resetted, and comprises auxiliary switch pipe and clamping capacitance, and the source electrode of auxiliary switch pipe links to each other with an end of clamping capacitance;
4) isolating transformer, be used for input, output are isolated, give the secondary conveying capacity, the auxiliary simultaneously zero voltage switch that realizes main switch, comprise the isolating transformer that has magnetizing inductance, the end of the same name on the former limit of isolating transformer links to each other with an end of the source electrode of first main switch and clamping capacitance, and the different name end links to each other with the drain electrode of second main switch and the source electrode of auxiliary switch pipe;
5) rectification circuit, be used for converting AC signal to direct current signal, comprise rectifier diode, throw linked switch and short bar by the first and second two multitools that sub-switch is formed more, isolating transformer secondary end of the same name links to each other with the transfer point of the first sub-switch, secondary different name end links to each other with the transfer point of the second sub-switch, the negative electrode of first rectifier diode links to each other with first fixed terminal of short bar and second terminal of the first sub-switch, the negative electrode of second rectifier diode links to each other with the anode of first rectifier diode and the first terminal of the first sub-switch, the anode of second rectifier diode links to each other with the anode of the 3rd rectifier diode, the negative electrode of the 3rd rectifier diode links to each other with the anode of the 4th rectifier diode and first terminal of the second sub-switch, and second terminal of the negative electrode of the 4th rectifier diode and the second sub-switch and second fixed terminal of short bar link to each other;
6) output filter network, be used for that the pulse signal of rectification circuit output is filtered into direct voltage and export to load, comprise first energy storage inductor, second energy storage inductor and output capacitance, one end of first energy storage inductor links to each other with first fixed terminal of short bar, the other end links to each other with an end of output capacitance and an end of second energy storage inductor, and the other end of second energy storage inductor links to each other with second fixed terminal of short bar.
For two active main switches optimizing the former limit of isolating transformer are realized the Zero-voltage soft switch environment, further feature of the present invention is any one the rectifier diode series connection pulsactor in rectification circuit.Perhaps at the former limit or the secondary serial or parallel connection inductor of isolating transformer.Said pulsactor is the inductor that unsaturation high magnetic permeability core configurations becomes.
Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor of the present invention by the various combination of multitool multithrow switch and short bar connection status, can obtain the DC convertor of following two kinds of difference in functionality structures:
First kind, the transfer point of the first sub-switching tube in the rectification circuit is connected to the first terminal, the transfer point of the second sub-switching tube is connected to the first terminal, the short bar closure, it is active-clamp double tube positive and negative sharp structure that formation has the former limit of transformer, secondary is the full-bridge rectification structure, the multifunctional active clamping full-bridge rectification type double tube positive and negative sharp current transformer that is used for the low-voltage input of two energy storage inductor parallel connections.
Second kind, the transfer point of the first sub-switching tube in the rectification circuit is connected to second terminal, the transfer point of the second sub-switching tube is connected to second terminal, short bar disconnects, it is active-clamp double tube positive and negative sharp structure that formation has the former limit of transformer, secondary is for doubly flowing rectifier structure, and the multifunctional active clamping that is used for the high voltage input that two energy storage inductors are connected with secondary doubly flows rectification type double tube positive and negative sharp current transformer.
Among the present invention, said first, second main switch and auxiliary switch pipe can be to comprise to add or parasitic anti-also mos field effect transistor (MOSFET) or the insulated gate bipolar transistor (IGBT) or the controllable silicon of diode; Or comprise and add or MOSFET or the IGBT or the controllable silicon of inherent parasitic capacitance.
Among the present invention, the multitool in the said rectification circuit (130) is thrown linked switch (K more 1) be mechanical switch or relay or electronic switch, said short bar is mechanical switch or relay or the electronic switch with two ends short circuit simultaneously or break function.
Beneficial effect of the present invention is:
When DC convertor input voltage range broad, can realize realizing unsteady flow with the optimum circuit topology by the transformation topology structure according to the difference of input voltage height.Current transformer can change first kind of topological transformation status circuit under the situation of low voltage input, and the secondary side rectification circuit of this moment is the full-bridge rectification type, and under with the duty ratio situation, this output voltage is that (voltage gain is for the twice of independent forward converter output voltage V O = V in n · 2 D ), voltage can be lifted to the output voltage stabilizing from lower input after no-load voltage ratio thus; Current transformer can change second kind of topological transformation status circuit under the situation of high voltage input, and the secondary side rectification circuit of this moment is for doubly flowing rectification type, and than under the situation, this output voltage is that (voltage gain is for half of first kind of topological transformation status circuit at the sky that coexists V O = V in n · D )。Because the duty ratio of different conditions is different with the output voltage relation, so this current transformer has under the different input voltages advantage by topological transformation realizes under the change in duty cycle scope, delivery efficiency is high.Utilize set of parameter to realize being under the high and low input voltage more excellent voltage stabilizing output current transformer thus by different combinations, simultaneously because of first, second main switch in this current transformer, the auxiliary switch pipe, isolating transformer, clamping capacitance, elements such as first, second, third, fourth rectifier diode and first, second energy storage inductor have all obtained recycling, thereby have reduced the element redundancy of system, have reduced cost.
Description of drawings
Fig. 1 is a kind of circuit structure diagram of multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor of the present invention;
Fig. 2 is another circuit structure diagram of multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor of the present invention;
Fig. 3 is that first kind of topology of multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor implemented circuit structure diagram;
Fig. 4 is the work wave of topology shown in Figure 3;
Fig. 5 is that second kind of topology of multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor implemented circuit structure diagram;
Fig. 6 is the work wave of topology shown in Figure 5.
Embodiment
With reference to Fig. 1, multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor of the present invention, it comprises:
1) direct-current input power supplying V In, be used to provide direct voltage;
2) the DC-to-DC change-over circuit 110, are used for the dc constant voltage type voltage transitions of described input is become the impulse type direct voltage, comprise the first main switch S 1, the second main switch S 2With clamping diode D 1, the first main switch S 1Drain electrode and direct-current input power supplying V InPositive pole link to each other source electrode and clamping diode D 1Negative electrode link to each other the second main switch S 2Source electrode and direct-current input power supplying V InNegative pole and clamping diode D 1Anode link to each other;
3) active clamping circuir 120, are used for transformer is resetted, and comprise auxiliary switch pipe S 3With clamping capacitance Cc, auxiliary switch pipe S 3Source electrode link to each other with the end of clamping capacitance Cc;
4) isolating transformer T R, be used for input, output are isolated, give the secondary conveying capacity, the auxiliary simultaneously main switch S that realizes 1, S 2Zero voltage switch, comprise the isolating transformer T that has magnetizing inductance R, isolating transformer T RThe end N of the same name on former limit 1With the first main switch S 1Source electrode and the end of clamping capacitance Cc link to each other different name end N 2With the second main switch S 2Drain electrode and auxiliary switch pipe S 3Source electrode link to each other;
5) rectification circuit 130, are used for converting AC signal to direct current signal, comprise rectifier diode D R1～D R4, by the first and second two sub-K switch 1-a, K 1-bThe multitool of forming is thrown linked switch K more 1With short bar K 1-c, isolating transformer T RSecondary end N of the same name 3With the first sub-K switch 1-aTransfer point link to each other secondary different name end N 4With the second sub-K switch 1-bTransfer point link to each other the first rectifier diode D R1Negative electrode and short bar K 1-cFirst fixed terminal 1 and the first sub-K switch 1-b Second terminal 2 link to each other the second rectifier diode D R2The negative electrode and the first rectifier diode D R1The anode and the first sub-K switch 1-aThe first terminal 1 link to each other the second rectifier diode D R2Anode and the 3rd rectifier diode D R3Anode link to each other the 3rd rectifier diode D R3Negative electrode and the 4th rectifier diode D R4The anode and the second sub-K switch 1-b First terminal 1 link to each other the 4th rectifier diode D R4The negative electrode and the second sub-K switch 1-b Second terminal 2 and short bar K 1-cSecond fixed terminal 2 link to each other;
6) output filter network 140 is used for that the pulse signal of rectification circuit output is filtered into direct voltage and exports to load, comprises the first energy storage inductor L O1, the second energy storage inductor L O2With output capacitance Co, the first energy storage inductor L O1An end and short bar K 1-cFirst fixed terminal 1 link to each other the end of the other end and output capacitance Co and the second energy storage inductor L O2An end link to each other the second energy storage inductor L O2The other end and short bar K 1-cSecond fixed terminal 2 link to each other.
Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor shown in Figure 2 is at rectifier diode D R3Pulsactor Ls has connected.Like this, two active main switches can optimizing the former limit of isolating transformer are realized the Zero-voltage soft switch environment.
Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor of the present invention by the various combination of multitool multithrow switch and short bar connection status, can obtain the DC convertor of following two kinds of difference in functionality structures:
First kind of topological circuit syndeton as shown in Figure 3, the first sub-switching tube K in the rectification circuit 130 1-aTransfer point be connected to the first terminal 1, the second sub-switching tube K 1-bTransfer point be connected to the first terminal 1, short bar K 1-cClosure, formation has transformer T RFormer limit is an active-clamp double tube positive and negative sharp structure, and secondary is the full-bridge rectification structure, energy storage inductor L O1, L O2The multifunctional active clamping full-bridge rectification type double tube positive and negative sharp current transformer that is used for the low-voltage input in parallel.
With DC convertor shown in Figure 2 is example, and the analytical work process is as follows.For simplifying the analysis, the spy does following supposition and explanation in the analysis below:＜1〉output filter capacitor C OBe considered to infinitely great and replace with constant pressure source;＜2〉circuit has entered stable state;＜3〉isolating transformer T RMagnetizing inductance use L at this mExpression;＜4〉the first main switch S 1With the second main switch S 2Open-minded simultaneously, but the second main switch S 2Than the first main switch S 1Postpone to turn-off tens nanoseconds;＜5〉auxiliary switch pipe S 3With main switch S 1, S 2Complementary conducting, the centre is provided with necessary Dead Time, but Dead Time is very of short duration in actual conditions, but draw them more exaggeratively in order more clearly to explain the course of work.＜6〉clamping capacitance C cBe considered to infinitely great and with voltage source V cReplace.
A switch periods of this current transformer can be divided into 8 operating states, and the work wave in each stage as shown in Figure 4.Among the figure, V Gs1～V Gs3Be respectively switching tube S 1, S 2, S 3The switch drive waveform, V TRBe isolating transformer T RThe voltage waveform at two ends, former limit, V Ds1～V Ds3Be respectively switching tube S 1, S 2, S 3Voltage waveform between the drain-source utmost point, i LMFor flowing through isolating transformer T RThe exciting curent waveform, iDR1 and iDR3 are for flowing through switching tube S 1, S 2, S 3Current waveform, Δ i LmACBe the of ac peak-to-peak value of exciting curent, i LmDCDC quantity for exciting curent; The concrete course of work of 8 working stages is described below respectively:
(1) stage one (t 0～t 1): the first main switch S 1With the second main switch S 2Open-minded, auxiliary switch pipe S 3Turn-off, and secondary pulsactor L sEnter saturation operation mode, at this moment isolating transformer T RThe magnetizing inductance electric current at input voltage V InThe effect lower linear increase clamping diode D 1Bear back-pressure V In, auxiliary switch pipe S 3Bear voltage V In+ V cSecondary diode D R1, D R3Conducting.Energy storage inductor L O1, L O2Parallel connection constitutes the LC filter network together as output inductor and output filter capacitor, and the voltage filter behind the diode rectification is become constant direct current output.
(2) stages two (t 1～t 2): at t 1Constantly, the first main switch S 1Turn-off its parasitic capacitance C Oss1Under the effect of exciting current, begin charging, simultaneously auxiliary switch S 3Parasitic capacitance voltage C Oss3Begin discharge.As the first main switch S 1Parasitic capacitance C Oss1Voltage charging is to V InThe time, auxiliary switch S 3Parasitic capacitance C Oss3Voltage reach V c, stage this moment two finishes.
(3) stages three (t 2～t 3): this moment the second main switch S 2Also and do not turn-off clamping diode D 1Conducting makes exciting current be able to afterflow, and exciting current remains unchanged in the stage three.
(4) stages four (t 3～t 4): at t 3Constantly, the second main switch S 2Turn-off auxiliary switch pipe S 3Also not open-minded.The second main switch S 2Parasitic capacitance C Oss2Begin charging, auxiliary switch S 3Parasitic capacitance C Oss3Begin from V cDescend clamping diode D 1End.As the second main switch S 2Parasitic capacitance C Oss2Charge to V cThe time, auxiliary switch S 3Parasitic capacitance C Oss3Voltage drop to 0, auxiliary switch S 3Parasitic diode begin conducting, be auxiliary switch S 3No-voltage open the condition created.
(5) stages five (t 4～t 5): at t 4Constantly, auxiliary switch pipe S 3The no-voltage conducting.Exciting current begins at clamping capacitance C cThe effect lower linear descend.But because pulsactor L sEffect secondary diode D R1, D R3Continue conducting.As pulsactor L sWhen entering saturation condition, the stage five finishes.
(6) stages six (t 5～t 6): continue at clamping capacitance C at this stage exciting current cThe effect lower linear descend isolating transformer T rOn voltage under just going up negative, this moment secondary diode D R1, D R3End D R2, D R4Conducting is powered to secondary.t 6Moment auxiliary switch pipe S 3Turn-off, the stage six finishes.
(7) stages seven (t 6～t 7): auxiliary switch pipe S 3Turn-off its parasitic capacitance C Oss3Begin charging, and the first main switch S 1With the second main switch S 2Parasitic capacitance C Oss1, C Oss2Begin discharge, when finishing to the stage seven, the first main switch S 1With the second main switch S 2Parasitic capacitance C Oss1, C Oss2On voltage be kept to zero, auxiliary switch pipe S 3Parasitic capacitance C Oss3Charge to V In+ V cThis moment the first main switch S 1With the second main switch S 2Parasitic diode begin conducting.Be the first main switch S 1With the second main switch S 2No-voltage open the condition created.
(8) stages eight (t 7～t 8): at t 7Constantly, be the first main switch S 1With the second main switch S 2No-voltage open-minded, isolating transformer T RThe magnetizing inductance electric current at input voltage V InEffect under begin linear growth, but because pulsactor L SEffect, secondary diode D R1, D R3The time-delay conducting, load current continues by diode D R2, D R4Afterflow.This operating state is up to pulsactor L STill saturated.
Second kind of topological circuit syndeton is shown in Figure 5, the first sub-switching tube K in the rectification circuit 130 1-aTransfer point be connected to second terminal, 2, the second sub-switching tube K 1-bTransfer point be connected to second terminal 2, short bar K 1-cDisconnect, formation has transformer T RFormer limit is an active-clamp double tube positive and negative sharp structure, and secondary is for doubly flowing rectifier structure, energy storage inductor L O1, L O2The multifunctional active clamping that is used for the high voltage input of connecting with secondary doubly flows rectification type double tube positive and negative sharp current transformer.
Second kind of topological circuit job analysis is as follows.A switch periods of current transformer can be divided into 8 operating states, in the analysis below, has adopted the hypothesis explanation of analyzing change in topology status circuit in first equally, the work wave in this stage as shown in Figure 6, among the figure, among the figure, V Gs1～V Gs3Be respectively switching tube S 1, S 2, S 3The switch drive waveform, V TRBe isolating transformer T RThe voltage waveform at two ends, former limit, V Ds1～V Ds3Be respectively switching tube S 1, S 2, S 3Voltage waveform between the drain-source utmost point, i LMFor flowing through isolating transformer T RThe exciting curent waveform, iDR1 and iDR3 are for flowing through switching tube S 1, S 2, S 3Current waveform, Δ i LmACBe the of ac peak-to-peak value of exciting curent, i LmDCDC quantity for exciting curent; The concrete course of work of 8 working stages is described below respectively:
(1) stage one (t 0～t 1): the first main switch S 1With the second main switch S 2Open-minded, auxiliary switch pipe S 3Turn-off, and secondary pulsactor L sEnter saturation operation mode, at this moment isolating transformer T rThe magnetizing inductance electric current at input voltage V InThe effect lower linear increase clamping diode D 1Bear back-pressure V In, auxiliary switch pipe S 3Bear voltage V In+ V cPower supply energy is by energy storage inductor L O1, secondary diode D R3, D R4Provide portion of energy to load, energy storage inductor L O1On current increases.Portion of energy is by energy storage inductor L in addition O2, by diode D R1, D R2Energy storage inductor L is provided O2Energy is subdued, and electric current reduces.
(2) stages two (t 1～t 2): at t 1Constantly, the first main switch S 1Turn-off its parasitic capacitance C Oss1Under the effect of exciting current, begin charging, simultaneously auxiliary switch S 3Parasitic capacitance voltage C Oss3Begin discharge.As the first main switch S 1Parasitic capacitance C Oss1Voltage charging is to V InThe time, auxiliary switch S 3Parasitic capacitance C Oss3Voltage reach V c, stage this moment two finishes.
(3) stages three (t 2～t 3): this moment the second main switch S 2Also and do not turn-off clamping diode D 1Conducting makes exciting current be able to afterflow, and exciting current remains unchanged in the stage three.
(4) stages four (t 3～t 4): at t 3Constantly, the second main switch S 2Turn-off auxiliary switch pipe S 3Also not open-minded.The second main switch S 2Parasitic capacitance C Oss2Begin charging, auxiliary switch S 3Parasitic capacitance C Oss3Begin from V cDescend clamping diode D 1End.As the second main switch S 2Parasitic capacitance C Oss2Charge to V cThe time, auxiliary switch S 3Parasitic capacitance C Oss3Voltage drop to 0, auxiliary switch S 3Parasitic diode begin conducting, be auxiliary switch S 3No-voltage open the condition created.
(5) stages five (t 4～t 5): at t 4Constantly, auxiliary switch pipe S 3The no-voltage conducting.Exciting current begins at clamping capacitance C cThe effect lower linear descend.But because pulsactor L sThe mode of operation of effect secondary side rectification circuit constant.As pulsactor L sWhen entering saturation condition, the stage five finishes.
(6) stages six (t 5～t 6): continue at clamping capacitance C at this stage exciting current cThe effect lower linear descend isolating transformer T rOn voltage under just going up negatively, this moment, the secondary power supply energy was by energy storage inductor L O2, secondary diode D R1, D R2Provide portion of energy to load, energy storage inductor L O2On electric current begin to increase.Portion of energy is by energy storage inductor L in addition O1, by diode D R1, D R2Energy storage inductor L is provided O2Energy consumption, electric current reduces.t 6Moment auxiliary switch pipe S 3Turn-off, the stage six finishes.
(7) stages seven (t 6～t 7): auxiliary switch pipe S 3Turn-off its parasitic capacitance C Oss3Begin charging, and the first main switch S 1With the second main switch S 2Parasitic capacitance C Oss1, C Oss2Begin discharge, when finishing to the stage seven, the first main switch S 1With the second main switch S 2Parasitic capacitance C Oss1, C Oss2On voltage be kept to zero, auxiliary switch pipe S 3Parasitic capacitance C Oss3Charge to V In+ V cThis moment the first main switch S 1With the second main switch S 2Parasitic diode begin conducting.Be the first main switch S 1With the second main switch S 2No-voltage open the condition created.
(8) stages eight (t 7～t 8): at t 7Constantly, be the first main switch S 1With the second main switch S 2No-voltage open-minded, isolating transformer T RThe magnetizing inductance electric current at input voltage V InEffect under begin linear growth, but because pulsactor L SEffect, the mode of operation of secondary side rectification circuit is constant.This operating state is up to pulsactor L STill saturated.

Claims (7)

1. multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor, it is characterized in that: it comprises:
1) direct-current input power supplying (V In), be used to provide direct voltage;
2) DC-to-DC change-over circuit (110) is used for the dc constant voltage type voltage transitions of input is become the impulse type direct voltage, comprises the first main switch (S 1), the second main switch (S 2) and clamping diode (D 1), the first main switch (S 1) drain electrode and direct-current input power supplying (V In) positive pole link to each other source electrode and clamping diode (D 1) negative electrode link to each other the second main switch (S 2) source electrode and direct-current input power supplying (V In) negative pole and clamping diode (D 1) anode link to each other;
3) active clamping circuir (120) comprises auxiliary switch pipe (S 3) and clamping capacitance (Cc), auxiliary switch pipe (S 3) source electrode link to each other with an end of clamping capacitance (Cc);
4) isolating transformer (T R), be used for input, output are isolated, give the secondary conveying capacity, the auxiliary simultaneously main switch (S that realizes 1, S 2) zero voltage switch, comprise the isolating transformer (T that has magnetizing inductance R), isolating transformer (T R) end (N of the same name on former limit 1) and the first main switch (S 1) source electrode and an end of clamping capacitance (Cc) link to each other different name end (N 2) and the second main switch (S 2) drain electrode and auxiliary switch pipe (S 3) source electrode link to each other;
5) rectification circuit (130) is used for converting AC signal to direct current signal, comprises first to fourth rectifier diode (D R1～D R4), by the first and second two sub-switch (K 1-a, K 1-b) multitool formed throws linked switch (K more 1) and short bar (K 1-c), isolating transformer (T R) secondary end (N of the same name 3) and the first sub-switch (K 1-a) transfer point link to each other secondary different name end (N 4) and the second sub-switch (K 1-b) transfer point link to each other the first rectifier diode (D R1) negative electrode and short bar (K 1-c) first fixed terminal (1) and the first sub-switch (K 1-b) second terminal (2) link to each other the second rectifier diode (D R2) the negative electrode and the first rectifier diode (D R1) the anode and the first sub-switch (K 1-a) the first terminal (1) link to each other the second rectifier diode (D R2) anode and the 3rd rectifier diode (D R3) anode link to each other the 3rd rectifier diode (D R3) negative electrode and the 4th rectifier diode (D R4) the anode and the second sub-switch (K 1-b) first terminal (1) link to each other the 4th rectifier diode (D R4) the negative electrode and the second sub-switch (K 1-b) second terminal (2) and short bar (K 1-c) second fixed terminal (2) link to each other;
6) output filter network (140) is used for that the pulse signal of rectification circuit output is filtered into direct voltage and exports to load, comprises the first energy storage inductor (L O1), the second energy storage inductor (L O2) and output capacitance (Co), the first energy storage inductor (L O1) an end and short bar (K 1-c) first fixed terminal (1) link to each other an end of the other end and output capacitance (Co) and the second energy storage inductor (L O2) an end link to each other the second energy storage inductor (L O2) the other end and short bar (K 1-c) second fixed terminal (2) link to each other.
2. multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor according to claim 1 is characterized in that any one the rectifier diode (D in the rectification circuit (130) R1Or D R2Or D R3Or D R4) series connection pulsactor (Ls); Perhaps at said isolating transformer (T R) former limit or secondary serial or parallel connection inductor.
3. multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor according to claim 2 is characterized in that the inductor that pulsactor (Ls) becomes for unsaturation high magnetic permeability core configurations.
4. multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor according to claim 1 and 2 is characterized in that the first sub-switching tube (K in the rectification circuit (130) 1-a) transfer point be connected to the first terminal (1), the second sub-switching tube (K 1-b) transfer point be connected to its first terminal (1), short bar (K 1-c) closure, formation has transformer (T R) former limit is active-clamp double tube positive and negative sharp structure, secondary is the full-bridge rectification structure, two energy storage inductor (L O1, L O2) the multifunctional active clamping full-bridge rectification type double tube positive and negative sharp current transformer that is used for the low-voltage input in parallel.
5. multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor according to claim 1 and 2 is characterized in that the first sub-switching tube (K in the rectification circuit (130) 1-a) transfer point be connected to second terminal (2), the second sub-switching tube (K 1-b) transfer point be connected to its second terminal (2), short bar (K 1-c) disconnect, formation has transformer (T R) former limit is active-clamp double tube positive and negative sharp structure, secondary is for doubly flowing rectifier structure, two energy storage inductor (L O1, L O2) multifunctional active clamping that is used for high voltage input of connecting with secondary doubly flows rectification type double tube positive and negative sharp current transformer.
6. multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor according to claim 1 and 2 is characterized in that said first, second main switch (S 1, S 2) and auxiliary switch pipe (S 3) be to comprise to add or parasitic anti-also MOSFET or the IGBT or the controllable silicon of diode; Or comprise and add or MOSFET or the IGBT or the controllable silicon of inherent parasitic capacitance.
7. multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor according to claim 1 and 2 is characterized in that the multitool in the said rectification circuit (130) is thrown linked switch (K more 1) be mechanical switch or relay or electronic switch, said short bar is mechanical switch or relay or the electronic switch with the short circuit simultaneously of three ends or break function.
CN2008101209752A 2008-09-09 2008-09-09 Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor Expired - Fee Related CN101355305B (en)

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CN101588131B (en) * 2009-06-11 2011-07-20 浙江大学 Primary feedback closed-loop control circuit of isolation type flyback converters
CN102299633B (en) * 2010-06-24 2015-07-08 英飞特电子（杭州）股份有限公司 Direct current-direct current (DC) conversion circuit
JP2017502638A (en) * 2013-12-20 2017-01-19 オークランド ユニサービシズ リミテッドAuckland Uniservices Limited Inductive power transfer pickup circuit with output current doubler
CN106160500A (en) * 2015-04-09 2016-11-23 成功 A kind of bidirectional power conversion plan based on full-bridge LLC
JP7192671B2 (en) 2019-06-11 2022-12-20 株式会社豊田自動織機 DC-DC converter
CN111555624B (en) * 2020-04-26 2022-04-26 武汉华中数控股份有限公司 Dual-output soft switching circuit
CN114070074B (en) * 2020-07-30 2022-12-30 华为数字能源技术有限公司 Double-tube flyback conversion circuit, power module, electric automobile and control method

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