CN100431250C - Isolated DC transducer of side edge clamp - Google Patents
Isolated DC transducer of side edge clamp Download PDFInfo
- Publication number
- CN100431250C CN100431250C CNB2007100193201A CN200710019320A CN100431250C CN 100431250 C CN100431250 C CN 100431250C CN B2007100193201 A CNB2007100193201 A CN B2007100193201A CN 200710019320 A CN200710019320 A CN 200710019320A CN 100431250 C CN100431250 C CN 100431250C
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- voltage
- transformer
- switching tube
- inverter bridge
- bridge leg
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Abstract
The DC convertor is composed of DC power supply, first inversion bridge arm, second bridge arm, resonant inductance, isolating transformer, rectifying and filtering circuit, current transformer, and clipper circuit. The added current transformer and clipper circuit eliminates voltage surge and voltage pike caused by backward recovery of rectifying tube, reduces voltage stress of rectifying tube, and eliminates waste caused by backward recovery of rectifying tube. Since voltage stress of clamp diode is smaller, tube with good capability can be selected to eliminate influence on circuit caused by stray parameter of clamp diode. Moreover, Comparing with mode that a clamp diode is placed at primary side of transformer to clip voltage at primary side, the clipper circuit clips voltage at secondary side of transformer in the invention can eliminate voltage surge and voltage pike of rectifier diode caused by leakage inductance of transformer.
Description
One, technical field
The isolated DC transducer of side edge clamp of the present invention, the DC converter of genus transformation of electrical energy device.
Two, background technology
In powerful DC converting occasion, full-bridge converter is realized easily soft switch and is adopted constant frequency control to obtain using widely owing to switching tube.Recent two decades comes, and soft switch control strategy of a lot of full-bridge converters and circuit topology have occurred.Phase shifting control full-bridge converter of zero-voltage switch and phase shifting control zero-voltage and zero-current switch full-bridge converter all can be realized the soft switch of switching tube.But no matter be zero voltage switch or zero-voltage and zero-current switch full-bridge converter, because existing oppositely, recovers the secondary rectifier diode, the leakage inductance of transformer (or additional resonant inductance) is just together with the junction capacitance generation resonance of exporting rectifying tube, can bear the peak voltage of twice at least on the diode, therefore must select kenotron, this also just means the forward conduction voltage drop that increases the secondary rectifier diode.Richard Redl, Nathan O.Sokal andLaszlo Balogh, " A novel soft-switching full-bridge DC/DC converter:analysis; design considerations; and experimental results at 1.5kW; 100kHz; " in Proc.IEEE PESC, 1990, pp.162-172 discloses a kind of Zero-voltage switch full-bridge direct current converter, a resonant inductance and two clamping diodes are introduced in former limit at transformer, have not only kept the soft switching characteristic of switching tube, have eliminated due to voltage spikes and voltage oscillation on the output rectifying tube simultaneously effectively.
But, when this converter is operated in underloading even no-load condition, the junction capacitance discharge regime of clamping diode, the energy that discharges can't be transferred to load end, can only be stored in the resonant inductance, force the many conductings of clamping diode once, electric current is the poor of resonant inductance electric current and transformer primary current in the clamping diode, this moment, the transformer primary current was approximately zero, electric current approximates the resonant inductance electric current in the clamping diode, because resonant inductance is by the switching tube of leading-bridge and clamping diode short circuit, inductive current remains unchanged, so electric current remains unchanged in approximate half switch periods in the clamping diode.Two clamping diodes are a switch periods alternate conduction, and are straight-through easily if the turn-off speed of clamping diode is fast inadequately, cause the damage of clamping diode.
Three, summary of the invention
The objective of the invention is to defective, develop a kind of isolated DC transducer of side edge clamp, realize the clamp of transformer both end voltage by output voltage at above-mentioned converter, with reduce to export rectifier diode voltage oscillation and due to voltage spikes.This converter can be selected the clamping diode of low-voltage quota for use, from root eliminated since the voltage quota of clamping diode than higher, himself parasitic parameter is to the influence of circuit performance, in addition, because the clamp circuit pincers is the transformer secondary voltage, the mode that is placed on the former limit of transformer pincers transformer original edge voltage with clamping diode is compared, can eliminate the rectifier diode that causes by transformer leakage inductance voltage oscillation and due to voltage spikes.
The isolated DC transducer of side edge clamp comprises DC power supply V
In, first inverter bridge leg and second inverter bridge leg, resonant inductance, isolating transformer, rectification and filter circuit, current transformer, clamp circuit.Wherein the first inverter bridge leg forward of being made up of first switching tube and the 3rd switching tube series connection back is connected in parallel on DC power supply V
InPositive-negative output end; The same forward of being made up of second switch pipe and the 4th switching tube series connection back of second inverter bridge leg is connected in parallel on DC power supply V
InPositive-negative output end, four switching tubes of above-mentioned first to fourth individual diodes also in parallel separately and a parasitic capacitance; The former limit of resonant inductance and isolating transformer windings in series, these series arm two ends are connected in the series connection point of two switching tubes of the series connection point of two switching tubes of first inverter bridge leg and second inverter bridge leg respectively; Two secondary windings with the number of turn of the secondary of above-mentioned isolating transformer are in series, wherein the series connection point of two secondary windings links to each other with the negative terminal of current rectifying and wave filtering circuit, two other disjunct terminal links to each other with two anodes of rectification and filter circuit respectively, and also two terminals of the former limit of summation current transformer winding link to each other simultaneously; The secondary winding of current transformer connects clamp circuit, two kinds of connected modes are arranged: first kind of mode, the secondary winding of current transformer and two clamping diodes are connected into way of full-wave rectification, the secondary of current transformer is two identical windings of the number of turn, the different name end of two windings links to each other, and connects output voltage V
oNegative terminal, disjunct in addition two terminals connect the anode of two clamping diodes respectively, the negative electrode of two clamping diodes links to each other, and is connected on output voltage V
oAnode; The second way, the secondary of current transformer have only a winding and four clamping diodes to be connected into the full-bridge rectification mode, and the output of clamping diode is connected on output voltage V
oTwo ends.
The present invention's major technique characteristics compared with prior art are, owing to added current transformer and clamp circuit, the voltage oscillation and the due to voltage spikes that cause because of the reverse recovery of exporting rectifying tube have been eliminated, reduced the voltage stress of output rectifying tube, and eliminated of the loss of output rectifying tube because of oppositely recovering to cause, simultaneously, because the voltage stress of clamping diode is smaller, can select the good pipe of performance for use, eliminate the influence that circuit is produced by the parasitic parameter of clamping diode from root.
Four, description of drawings
Accompanying drawing 1 and accompanying drawing 2 are two kinds of example circuit structural representations of isolated DC transducer of side edge clamp of the present invention.
Accompanying drawing 3 is groundwork waveform schematic diagrames of the isolated DC transducer of side edge clamp of the present invention.
Accompanying drawing 4 ~ 13rd, the equivalent circuit structure schematic diagram of the isolated DC transducer of side edge clamp of the present invention.Designation among the above-mentioned figure: V
In, DC power supply voltage, Q
1～Q
4, main switch, D
1～D
4, switching tube body diode, C
1～C
4, the switching tube parasitic capacitance, L
r, resonant inductance, T
r, isolating transformer, D
R1, D
R2, output rectifier diode, C
DR1, C
DR2, output rectifier diode D
R1, D
R2Junction capacitance, L
f, output inductor, C
f, output filter capacitor, R
Ld, load, T
c, current transformer, D
5～D
8, clamping diode, v
Rect, voltage after the rectification of transformer secondary, v
AB, A and B point-to-point transmission voltage, i
p, the transformer primary current, i
Lr, the resonant inductance electric current, i
D5, flow through clamping diode D
5Electric current, i
D6, flow through clamping diode D
6Electric current.
Five, embodiment
Shown in accompanying drawing 1 and the accompanying drawing 2 is two kinds of electrical block diagrams of the isolated DC transducer of side edge clamp.By DC power supply V
In, two inverter bridge leg 1 and 2, resonant inductance 3, isolating transformer 4, rectification and filter circuit 5, current transformer 6, clamp circuits 7 form.Q
1～Q
4Be four main switches, D
1～D
4Be respectively switching tube Q
1～Q
4Body diode, C
1～C
4Be respectively switching tube Q
1～Q
4Parasitic capacitance, L
rBe resonant inductance, T
rBe isolating transformer, D
R1And D
R2Be the output rectifier diode, C
DR1And C
DR2Be output rectifier diode D
R1, D
R2Junction capacitance, L
fBe output inductor, C
fBe output filter capacitor, R
LdBe load, T
cBe current transformer, D
5～D
8It is clamping diode.This converter using phase shifting control, switching tube Q
1And Q
3Be ahead of switching tube Q respectively
4And Q
2A phase place claims switching tube Q
1And Q
3First inverter bridge leg of forming is a leading-bridge, switching tube Q
2And Q
4Second inverter bridge leg of forming then is a lagging leg.Resonant inductance 3 and above-mentioned isolating transformer 4 former limit windings in series, two switching tube Q of the resonant inductance other end and first inverter bridge leg 1 in this series arm
1, Q
3Series connection point A link to each other the other end of isolating transformer 5 former limit windings and two switching tube Q of second inverter bridge leg 2
2, Q
4Series connection point B link to each other; Two secondary windings with the number of turn of the secondary of above-mentioned isolating transformer 4 are in series, wherein the series connection point of two secondary windings links to each other with the negative terminal of current rectifying and wave filtering circuit, two other disjunct terminal links to each other with two anodes of rectification and filter circuit respectively, and characteristics of the present invention are: also two terminals of the former limit of summation current transformer winding are continuous simultaneously for disjunct two end points of two secondary windings of above-mentioned transformer; The secondary winding of current transformer connects clamping diode, two kinds of connected modes are arranged: first kind of mode, the secondary winding of current transformer and two clamping diodes are connected into way of full-wave rectification, the secondary of current transformer is two identical windings of the number of turn, the different name end of two windings links to each other, and connects output voltage V
oNegative terminal, disjunct in addition two terminals connect the anode of two clamping diodes respectively, the negative electrode of two clamping diodes links to each other, and is connected on output voltage V
oAnode; The second way, the secondary of current transformer have only a winding and four clamping diodes to be connected into the full-bridge rectification mode, and the output of clamping diode is connected on output voltage V
oTwo ends.
Be main circuit structure with accompanying drawing 1 below, 3～13 narrate concrete operation principle of the present invention in conjunction with the accompanying drawings.Before analyzing, make the following assumptions: 1. all switching tubes and diode are desirable device, rectifier diode D
R1And D
R2Except, equivalence is an ideal diode and an electric capacity parallel connection, to be used for the simulated inverse recovery; 2. all inductance, electric capacity and transformer are ideal element.
By accompanying drawing 3 as can be known whole converter a switch periods 21 kinds of switch mode are arranged, be respectively [t
0[t in the past],
0, t
1], [t
1, t
2], [t
2, t
3], [t
3, t
4], [t
4, t
5], [t
5, t
6], [t
6, t
7], [t
7, t
8], [t
8, t
9], [t
9, t
10], [t
10, t
11], [t
11, t
12], [t
12, t
13], [t
13, t
14], [t
14, t
15], [t
15, t
16], [t
16, t
17], [t
17, t
18], [t
18, t
19], [t
19, t
20] (seeing accompanying drawing 3), wherein, [t
0In the past, t
10] be the preceding half period, [t
10, t
20] be the later half cycle.Below the working condition of each switch mode is made a concrete analysis of.
1. switch mode 1[t
0[corresponding to accompanying drawing 4] in the past]
t
0In the past, switching tube Q
1And Q
4Conducting, secondary rectifier diode D
R1Conducting, rectifier diode D
R2End.
2. switch mode 2[t
0, t
1] [corresponding to accompanying drawing 5]
t
0Moment on-off switching tube Q
1, primary current i
pGive capacitor C
1Capacitor C is given in charging simultaneously
3Discharge, the A point voltage descends.Because capacitor C is arranged
1And C
3, switching tube Q
1Be that no-voltage is turn-offed.Junction capacitance C
DR2Discharge, primary current i
pWith resonance inductive current i
LrResonance descends.Because C point current potential is all the time greater than zero, so clamping diode D
6Can not conducting.Simultaneously because junction capacitance C
DR2Discharge, secondary voltage reduces, and original edge voltage reduces thereupon, and B point voltage clamp is zero, so C point current potential must be less than input voltage V
In, so clamping diode D
5Also can not conducting.t
1Constantly, capacitor C
3Voltage drop to zero, promptly A point current potential reduce to zero, diode D
3Conducting.
3. switch mode 3[t
1, t
2] [corresponding to accompanying drawing 6]
Diode D
3After the conducting, can no-voltage open switching tube Q
3When A point current potential reduced to zero, the C point voltage did not also drop to zero, at this moment rectifier diode D
R2Junction capacitance C
DR2Continue discharge, the resonant inductance current i
LrWith primary current i
pContinue to descend.t
2Constantly, rectifier diode D
R2Junction capacitance C
DR2Discharge finishes, diode D
R2Conducting, C point voltage drop to zero.
4. switch mode 4[t
2, t
3] [corresponding to accompanying drawing 7]
Rectifier diode D
R1And D
R2Conducting simultaneously, in zero-bit, A, B, 3 current potentials of C are zero at this moment, the resonant inductance current i with the former secondary voltage pincers of transformer
LrWith primary current i
pEquate, be in nature afterflow state, and remain unchanged always.
5. switch mode 5[t
3, t
4] [corresponding to accompanying drawing 8]
t
3Moment on-off switching tube Q
4, current i
LrGive capacitor C
4Capacitor C is given in charging simultaneously
2Discharge.Because capacitor C
2And C
4Existence, switching tube Q
4Be that no-voltage is turn-offed.Because rectifier diode D
R1And D
R2All conductings, so the former secondary voltage of transformer is zero, voltage v
ABDirectly be added in resonant inductance L
rOn, therefore, during this period, resonant inductance L in fact
rWith junction capacitance C
2, C
4In resonance work.To t
4Constantly, capacitor C
4Voltage rise to DC power supply voltage V
In, capacitor C
2Voltage drop to zero, diode D
2The nature conducting.
6. switch mode 6[t
4, t
5] [corresponding to accompanying drawing 9]
Diode D
2After the conducting, can no-voltage open switching tube Q
2This moment primary current i
pBe not enough to provide load current, rectifier diode D
R1And D
R2Conducting simultaneously, the former secondary voltage of transformer are zero, so DC power supply voltage V
InAll be added in resonant inductance L
rTwo ends, the resonant inductance current i
LrEqual primary current i
p, both are linear to descend.
7. switch mode 7[t
5, t
6] [corresponding to accompanying drawing 10]
To t
5Constantly, resonant inductance current i
LrWith primary current i
pAll drop to zero, and negative direction increases primary current i
pOppositely the back is by switching tube Q
2And Q
3Path is provided, and load current still provides the loop by two rectifier diodes, and the former secondary voltage of transformer is still zero.Up to t
6Constantly, primary current i
pReach the load current of conversion, rectifier diode D to former limit
R1Turn-off.
8. switch mode 8[t
6, t
8] [corresponding to accompanying drawing 11]
At t
6Constantly, resonant inductance L
rWith rectifier diode junction capacitance C
DR1Rectifier diode D is given in resonance work
R1Junction capacitance C
DR1Charging, primary current i
pWith resonance inductive current i
LrContinuing increases.
During this period of time, the B point voltage is fixed on DC power supply voltage V
In, and the former limit of transformer winding voltage v
BCBecause rectifier diode junction capacitance C
DR1Charging also rise simultaneously, so C point current potential is descending always.t
7Constantly, junction capacitance C
DR1Be charged to 2V
In/ N, this moment, the transformer original edge voltage equaled V
In, the C point voltage drops to zero.t
7Constantly, junction capacitance C
DR1Continue to be recharged, the former secondary voltage of transformer continues to raise, because the C point voltage is less than 0, so the resonant inductance current i
LrBeginning oppositely reduces.
9. switch mode 9[t
8, t
9] [corresponding to accompanying drawing 12]
t
8Constantly, the side edge clamp circuit is started working, current transformer T
cTerminal voltage of the same name is for bearing clamping diode D
6Conducting is T
cThe secondary voltage pincers in output voltage V
o, the original edge voltage pincers is at nV
o, just going up negative down.Be main transformer T
rThe voltage of two secondary windings by pincers at nV
oJunction capacitance C
DR1Voltage by clamp after, junction capacitance C
DR1Charging current suddenly change to 0, this part electric current is by T
cShift, from clamping diode D
6Flow to outlet side.After this, filtered circuit increases, T
rThe original edge voltage pincers is at nNV
o/ 2, the right side is just being born in a left side, and this moment, the B point voltage equaled input voltage V
InSo the C point voltage is clamped at one less than 0 value, makes resonant inductance electric current and primary current oppositely reduce, so flow through clamping diode D
6Current i
D6Can descend fast.
10. switch mode 10[t
9, t
10] [corresponding to accompanying drawing 13]
t
9Constantly, resonant inductance electric current and main transformer primary current equate with the filter inductance electric current of converting former limit, flow through clamping diode D
6Current i
D6Drop to 0, clamping diode D
6Be turned off, do not have electric current from current transformer T
cFlow through.After this, resonant inductance and junction capacitance C
DR1Resonance takes place, and on the voltage after the secondary rectification, though there is vibration, steady-state value remains V
In/ N.
As seen from the above description, the isolated DC transducer of the side edge clamp of the present invention's proposition has following advantage:
1. the side edge clamp circuit can have been eliminated due to voltage spikes and the voltage oscillation on the output rectifying tube effectively, reduces defeated Go out the voltage stress of rectifying tube.
2. clamp diode voltage stress relevant with output voltage to input voltage is irrelevant, and be defeated at high voltage input and low-voltage Go out the application scenario, the lower pipe of the available voltage quota of clamp diode, performance is more excellent.
3. can realize the ZVT of switching tube.
Claims (2)
1, a kind of isolated DC transducer of side edge clamp comprises DC power supply (V
In), first inverter bridge leg (1) and second inverter bridge leg (2), resonant inductance (3), isolating transformer (4), rectification and filter circuit (5), wherein by the first switching tube (Q
1) and the 3rd switching tube (Q
3) first inverter bridge leg (1) forward formed of series connection back is connected in parallel on DC power supply (V
In) positive-negative output end; By second switch pipe (Q
2) and the 4th switching tube (Q
4) the same forward of second inverter bridge leg (2) formed of series connection back is connected in parallel on DC power supply (V
In) positive-negative output end, four switching tube (Q of above-mentioned first to fourth
1, Q
2, Q
3, Q
4) individual diodes also in parallel separately and a parasitic capacitance; Resonant inductance (3) and the former limit of isolating transformer (4) windings in series, these series arm two ends are connected in two switching tube (Q of first inverter bridge leg (1) respectively
1, Q
3) series connection point (A) and two switching tube (Q of second inverter bridge leg (2)
2, Q
4) series connection point (B); Two secondary windings with the number of turn of the secondary of isolating transformer (4) are in series, wherein the series connection point of two secondary windings links to each other with the negative terminal of current rectifying and wave filtering circuit (5), and two other disjunct terminal links to each other with two anodes of rectification and filter circuit (5) respectively; It is characterized in that also comprising current transformer (6), clamp circuit (7), also two terminals of the former limit of summation current transformer (6) winding are continuous simultaneously for two disjunct terminals of the secondary of above-mentioned isolating transformer (4); The secondary winding of current transformer (6) connects clamp circuit (7), two clamping diode (D of the secondary winding of current transformer (6) and clamp circuit (7)
5, D
6) when being connected into way of full-wave rectification, the secondary of current transformer (6) is two identical windings of the number of turn, the different name end of two windings links to each other, and meets output voltage (V
o) negative terminal, disjunct in addition two terminals meet two clamping diode (D respectively
5, D
6) anode, two clamping diode (D
5, D
6) negative electrode link to each other, be connected on output voltage (V
o) anode;
2, a kind of isolated DC transducer of side edge clamp comprises DC power supply (V
In), first inverter bridge leg (1) and second inverter bridge leg (2), resonant inductance (3), isolating transformer (4), rectification and filter circuit (5), wherein by the first switching tube (Q
1) and the 3rd switching tube (Q
3) first inverter bridge leg (1) forward formed of series connection back is connected in parallel on DC power supply (V
In) positive-negative output end; By second switch pipe (Q
2) and the 4th switching tube (Q
4) the same forward of second inverter bridge leg (2) formed of series connection back is connected in parallel on DC power supply (V
In) positive-negative output end, four switching tube (Q of above-mentioned first to fourth
1, Q
2, Q
3, Q
4) individual diodes also in parallel separately and a parasitic capacitance; Resonant inductance (3) and the former limit of isolating transformer (4) windings in series, these series arm two ends are connected in two switching tube (Q of first inverter bridge leg (1) respectively
1, Q
3) series connection point (A) and two switching tube (Q of second inverter bridge leg (2)
2, Q
4) series connection point (B); Two secondary windings with the number of turn of the secondary of isolating transformer (4) are in series, wherein the series connection point of two secondary windings links to each other with the negative terminal of current rectifying and wave filtering circuit (5), and two other disjunct terminal links to each other with two anodes of rectification and filter circuit (5) respectively; It is characterized in that also comprising current transformer (6), clamp circuit (7), also two terminals of the former limit of summation current transformer (6) winding are continuous simultaneously for two disjunct terminals of the secondary of above-mentioned isolating transformer (4); Four clamping diode (D of the secondary winding of current transformer (6) and clamp circuit (7)
5, D
6, D
7, D
8) being connected into the full-bridge rectification mode, the output of clamp circuit (7) is connected on output voltage (V
o) two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100193201A CN100431250C (en) | 2007-01-15 | 2007-01-15 | Isolated DC transducer of side edge clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100193201A CN100431250C (en) | 2007-01-15 | 2007-01-15 | Isolated DC transducer of side edge clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101005240A CN101005240A (en) | 2007-07-25 |
| CN100431250C true CN100431250C (en) | 2008-11-05 |
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|---|---|---|---|
| CNB2007100193201A Expired - Fee Related CN100431250C (en) | 2007-01-15 | 2007-01-15 | Isolated DC transducer of side edge clamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7957161B2 (en) * | 2009-03-03 | 2011-06-07 | National Taiwan University Of Science And Technology | Power converters |
| CN104883082B (en) * | 2010-05-31 | 2017-09-19 | 三菱电机株式会社 | Power-converting device |
| CN103683464B (en) * | 2013-12-17 | 2016-11-09 | 广东省自动化研究所 | EPS power-supply system and control method thereof based on dual processor |
| AT516903B1 (en) * | 2015-03-09 | 2020-10-15 | Fronius Int Gmbh | Circuit arrangement with transformer with center tap and measurement of the output voltage |
| CN105245113B (en) * | 2015-10-29 | 2017-08-11 | 燕山大学 | The anti-straight-through Sofe Switch of one kind recommends LLC resonant converter |
| CN110045262B (en) | 2018-01-15 | 2021-06-22 | 株式会社村田制作所 | Switch driving circuit fault detection device and method and electronic equipment |
| CN112202342B (en) * | 2020-11-03 | 2021-06-25 | 深圳威迈斯新能源股份有限公司 | Magnetic balance circuit of bidirectional resonant converter and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5198969A (en) * | 1990-07-13 | 1993-03-30 | Design Automation, Inc. | Soft-switching full-bridge dc/dc converting |
| US6944036B2 (en) * | 2003-05-22 | 2005-09-13 | Delta Electronics, Inc. | DC/DC converter with voltage clamp circuit |
| CN1716746A (en) * | 2005-08-08 | 2006-01-04 | 南京航空航天大学 | Zero voltage switch three lever double tube positive exciting DC converter with clamp diode |
-
2007
- 2007-01-15 CN CNB2007100193201A patent/CN100431250C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5198969A (en) * | 1990-07-13 | 1993-03-30 | Design Automation, Inc. | Soft-switching full-bridge dc/dc converting |
| US6944036B2 (en) * | 2003-05-22 | 2005-09-13 | Delta Electronics, Inc. | DC/DC converter with voltage clamp circuit |
| CN1716746A (en) * | 2005-08-08 | 2006-01-04 | 南京航空航天大学 | Zero voltage switch three lever double tube positive exciting DC converter with clamp diode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101005240A (en) | 2007-07-25 |
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