CN100553099C - The soft switch circuit of power supply unit - Google Patents
The soft switch circuit of power supply unit Download PDFInfo
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- CN100553099C CN100553099C CNB2007100862747A CN200710086274A CN100553099C CN 100553099 C CN100553099 C CN 100553099C CN B2007100862747 A CNB2007100862747 A CN B2007100862747A CN 200710086274 A CN200710086274 A CN 200710086274A CN 100553099 C CN100553099 C CN 100553099C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
A kind of soft switch circuit of power supply unit comprises that a no bridge type rectification circuit connects an auxiliary circuit; This no bridge type rectification circuit includes at least one filter inductance, two main switches, two diodes and an electric capacity, wherein this filter inductance connects the anode of first diode, and the negative electrode of first diode connects the negative electrode of second diode again, the anode of this second diode connects the drain electrode of first main switch, and the source electrode of first main switch connects the source electrode formation series connection of second main switch again, the negative electrode of these two diodes and two main switch source electrode electric capacity in parallel are to reduce the conducting loss; One auxiliary circuit comprises at least one resonant inductance, an auxiliary switch, at least two diodes and a voltage source circuit, thus, finish the characteristic of main switch zero voltage switching and the switching of auxiliary switch zero current with this soft switch circuit, and have the characteristic that the switching damage was decreased and hanged down in low conducting simultaneously.
Description
Technical field
The present invention relates to a kind of soft switch circuit of power supply unit, this circuit is a kind of design that connects an auxiliary circuit in the no bridge type rectification circuit, the soft switching that no-voltage shifts is finished in order, lower switch cost, and have the characteristic that low conducting is decreased and low switching is decreased simultaneously, be applicable to power supply unit or similar structures.
Background technology
Ke Ji prosperity now, part at relevant power supply is used also more and more widely, increasing product all can use power supply unit, especially at personal computer, industrial computer, switch, cash register, table-printing equipment ... etc., demand AC/DC AC/DC power source conversion, and open and close power supply by the switching regulator structure.
And most power supply changeover device that adopts the power factor correcting of booster type structure as shown in fig. 1 in the present power supply unit, it changes into direct current by bridge rectifier with AC power earlier, Jiang the boosting type converter pattern that operates in again, its mode of operation is two: one, when switch conduction, the inductor storage power, they are two years old, when switch lead by the time, inductor releases energy to load through diode, and utilize the characteristic of its continuous input current, making it input current by the power factor control technique is the string ripple, and reaches output voltage and the purpose of going into the electric current regulation and control.
Fig. 2 partly is the power supply changeover device that adopts the power factor correcting of no bridge type booster type structure, can save the bridge rectifier of front end, utilize the electric current control technique directly interchange to be changed into direct current and also can obtain good regulating and controlling voltage characteristic, input current is also adjustable approximate string ripple, because the no bridge type rectifier, so there is the less elements conducting to decrease.
Yet two kinds of structures of its above-mentioned Fig. 1 and Fig. 2 can cause bigger switch cost and electromagnetic interference when high-frequency operation, are to be its topmost defective.
The inventor is because above-mentioned defective, hope can provide a kind of utilization to connect the design of an auxiliary circuit in the no bridge type rectification circuit, undermine the low usefulness of decreasing of switching to reach low conducting, consumption is popular to be used to offer, and is the creation motivation of institute of the present invention desire research and development.
Summary of the invention
Main purpose of the present invention is to provide a kind of soft switch circuit of power supply unit, by connecting the design of an auxiliary circuit in the no bridge type rectification circuit, can finish the characteristic that main switch zero voltage switching and auxiliary switch zero current switch, make to have low conducting simultaneously and undermine low the switching and decrease.
An of the present invention purpose is to provide a kind of soft switch circuit of power supply unit, removes bridge rectifier via the no bridge type rectification circuit at input, reduces the conducting loss to reach, and makes circuit have low conducting and decreases.
In order to achieve the above object, the invention provides a kind of soft switch circuit of power supply unit, comprise: a no bridge type rectification circuit, this no bridge type rectification circuit includes at least one filter inductance, two main switches, two diodes and an electric capacity, wherein this filter inductance connects the anode of first diode, and the negative electrode of first diode connects the negative electrode of second diode again, the anode of this second diode connects the drain electrode of first main switch, and the source electrode of first main switch connects the source electrode formation series connection of second main switch again, the source electrode of the negative electrode of these two diodes and two a main switches electric capacity in parallel, the anode of electric capacity is connected with the negative electrode of diode, and the negative electrode of electric capacity is connected with the source electrode of main switch, to reduce the conducting loss; One auxiliary circuit, this auxiliary circuit is connected in the no bridge type rectification circuit, and this auxiliary circuit comprises at least one resonant inductance, an auxiliary switch, at least two diodes and a voltage source circuit, wherein the negative electrode of these two diodes connection resonant inductance is connected with voltage source circuit again, and voltage source circuit connects the drain electrode of auxiliary switch again.Thus, finish the characteristic of main switch zero voltage switching and the switching of auxiliary switch zero current, and have the characteristic that the switching damage was decreased and hanged down in low conducting simultaneously with soft switch circuit.
By above-mentioned technical characterictic,, have following advantage with circuit of the present invention:
1, auxiliary circuit of the present invention is promptly when each switching cycle, give time of delay constantly with the conducting of the main switch control signal of no bridge type rectification circuit, and the ON time of in time of delay, assigning auxiliary switch, make resonant inductance in time of delay, finish resonance, promptly finish the soft switching that no-voltage shifts, lower switch cost.
2, the present invention can finish the characteristic that main switch zero voltage switching and auxiliary switch zero current switch by connecting the design of an auxiliary circuit in the no bridge type rectification circuit, makes to have low conducting simultaneously and undermine the low damage person of switching.And can effectively suppress the function of electromagnetic interference (EMI).
Other characteristics of the present invention and specific embodiment can further be understood in the detailed description of following conjunction with figs..
Description of drawings
Fig. 1 is the first embodiment schematic diagram of prior art.
Fig. 2 is the second embodiment schematic diagram of prior art.
Fig. 3 is a circuit box schematic diagram of the present invention.
Fig. 4 is that circuit first of the present invention is implemented illustration.
Fig. 5 is that circuit second of the present invention is implemented illustration.
Fig. 6 is that circuit the 3rd of the present invention is implemented illustration.
Fig. 7 is that circuit the 4th of the present invention is implemented illustration.
Fig. 8 is that circuit the 5th of the present invention is implemented illustration.
Fig. 9 is that circuit the 6th of the present invention is implemented illustration.
Figure 10 is motion action mode circuit figure of the present invention.
Figure 11 is the oscillogram of motion action pattern of the present invention.
Symbol description among the figure
10 no bridge type rectification circuits
11 filter inductances
12 main switches
13 diodes
14 electric capacity
20 auxiliary circuits
21 resonant inductances
22 auxiliary switches
23 utmost point pipes
24 voltage source circuits
241 additive polarity self coupling full-bridge transformer circuits
242 subtractive polarity self coupling full-bridge transformer circuits
243 additive polarity transformer circuits
244 subtractive polarity autotransformer circuit
245 additive polarity autotransformer circuit
246 center tap transformer circuits
25 parasitic capacitances
Embodiment
Please refer to Fig. 3, the soft switch circuit of power supply unit of the present invention mainly includes a no bridge type rectification circuit 10 and an auxiliary circuit 20; This auxiliary circuit 20 is connected in the no bridge type rectification circuit 10, and this no bridge type rectification circuit 10 includes at least one filter inductance 11, two main switches 12, two diodes 13 and an electric capacity 14, wherein this filter inductance 11 connects first diode 13, this filter inductance 11 is manifold type filter inductance or non-manifold type filter inductance, and first diode 13 connects second diode 13 again, and second diode 13 connects first main switch 12, and first main switch 12 connects second main switch 12 again, an electric capacity 14 in parallel in this diode 13 and the main switch 12, for removing bridge rectifier, to reduce the conducting loss at input; And this auxiliary circuit 20 comprises at least one resonant inductance 21, one auxiliary switch 22, at least two diodes 23 and a voltage source circuit 24, wherein these at least two diodes 23 connection resonant inductances 21 are connected with voltage source circuit 24 again, and voltage source circuit 24 connects auxiliary switch 22 again, further be provided with in this auxiliary circuit 20 in addition resonant capacitance (maybe can utilize the parasitic capacitance 25 of main switch or auxiliary switch itself) confession in resonant inductance 21 at this moment between in finish resonance, wherein the auxiliary switch 22 of the main switch 12 of this no bridge type rectification circuit 10 and auxiliary circuit 20 forms (parasitic capacitance and the diode that also can utilize switch self) for metal-oxide semiconductor (MOS) (Metal-Oxide-Semiconductor) shunt capacitance and diode, or igbt (Insulated Gate Bipolar Transistor) shunt capacitance and diode form (parasitic capacitance and the diode that also can utilize switch self), the element of opening up that also can be except that above-mentioned element with other replaces, promptly when each switching cycle, give time of delay constantly with the conducting of main switch 12 control signals of no bridge type rectification circuit 10, and the ON time of in time of delay, assigning auxiliary switch 22, make resonant inductance 21 in time of delay, finish resonance, promptly finish the soft switching that no-voltage shifts, lower switch cost.
Please refer to Fig. 3～Fig. 9, switching power circuit for embodiments of the invention, in soft switch circuit, because input current is for exchanging, the branch that positive half cycle and negative half period are arranged, but its operation can be divided into two large models, and mainly soft handover operation is being discussed in embodiment, so its running principle in dpd mode is identical, so its input power supply of hypothesis is positive half cycle earlier, analyze soft switch operating again, because switching cycle is extremely short, so can suppose that boost inductance L is enough big, and visual its electric current is a constant current source, output filter capacitor C is enough big, looks its voltage for deciding voltage source, i.e. i
i=I
iAnd v
o=V
o, wherein analyze resonant capacitance C for convenient
SaWith diode D
4Still keep, when practical application, resonant capacitance C
SrAvailable S
SaParasitic capacitance substitute diode D
4Available S
rThe back of the body connect diode and substitute.This power circuit can be finished zero current by the auxiliary switch 22 on the auxiliary circuit 20 that adds and switch, its notion is series connection one equivalent voltage source circuit 24, its voltage source circuit 24 is connected to the way of output with transformer and realizes, decide voltage source induction certain voltage on auxiliary circuit and utilize to be output as, switch in order to help auxiliary switch 22 can finish zero current, and transformer also can adopt the mode of additive polarity and subtractive polarity to realize, as Figure 4 shows that subtractive polarity self coupling full-bridge transformer circuit 241, this subtractive polarity self coupling full-bridge transformer circuit 241 is made up of four diodes and a subtractive polarity transformer, and Figure 5 shows that additive polarity self coupling full-bridge transformer circuit 242, this additive polarity self coupling full-bridge transformer circuit 242 is made up of four diodes and an additive polarity transformer, and Figure 6 shows that additive polarity transformer 243, this additive polarity transformer 243 is made up of two diodes and an additive polarity transformer, and Figure 7 shows that subtractive polarity autotransformer 244, this subtractive polarity autotransformer 244 is by a diode, one resistance, one electric capacity and a subtractive polarity transformer are formed, and Figure 8 shows that additive polarity autotransformer 245, this additive polarity autotransformer 245 is by a diode, one resistance, one electric capacity and an additive polarity transformer are formed, and Figure 9 shows that center tap transformer 246, this center tap transformer 246 is made up of two diodes and a center tap transformer, is the execution mode of various different aspects of the present invention.
Please refer to Figure 10, be operator scheme circuit diagram of the present invention, its operation can be divided into ten patterns to be analyzed, and the waveform grass of each key variables is plotted in Figure 11.Circuit operation situation under each pattern is summarized as follows:
Pattern 0 (t
9～t
0): at t
9≤ t≤t
0During this time, main switch S and auxiliary switch S
rAll end input current I
iVia diode D
aFlow to load, and via S
bThe back of the body connect diode and be back to input, diode D
aCurrent i
Da=I
i, this moment is across voltage (the being resonant capacitor voltage) v of main switch
s=V
oPattern 1 (t
0～t
1): at t=t
0The time, main switch S is delayed and auxiliary switch S
rConducting in advance enters pattern 1, D
RaConducting, current i at this moment
LrD flows through
Ra, L
rWith T
rWinding N
p, and at winding N
sProduce induced current i
s, this induced current i
sThrough D
1To V
o, again by D
4Reply, at this moment T
rSecondary side is striden and is decided voltage source V
o, exciting curent i
mThe linear rising, thus can respond to the certain voltage source at primary side, again because D
aStill conducting, so current i
LrBeginning is linear rises, then auxiliary switch S
rBe soft conducting (soft turn on).The conducting situation of circuit is worked as current i under this pattern
LrRise to I
iThe time, this pattern stops, i.e. t=t
1Pattern 2 (t
1～t
2): work as current i
LrRise to I
iThe time, diode D
aEnd, enter pattern 2, in the lasting conducting of the following auxiliary switch of this pattern, resonant inductance and resonant capacitance form the resonance tank circuit, and inductive current continues to rise, and resonant capacitance voltage (is main switch voltage (v
s)) descend, work as v
sBy V
oDrop to zero, this pattern stops, i.e. t=t
2Mode 3 (t
2～t
3): as resonant capacitance voltage (v
s) at t=t
2Drop to zero, enter mode 3, resonant capacitance voltage (v
s) continue to descend, cause the back of the body of main switch to meet diode D
SaConducting, current i
LrBeginning is linear to descend current i
SaBeginning is linear rises, and this moment, main switch voltage was zero, as t 〉=t
2The time, can trigger main switch S
aWhat make finishes zero voltage switching (ZVS) conducting.Work as i
SaWhen rising to zero, this pattern stops, i.e. t=t by negative
3Pattern 4 (t
3～t
4): at t=t
3The time, current i
SaRise to zero by negative, the back of the body of main switch meets diode D
SaEnd, enter pattern 4, at this moment i
SaContinue linear rising, current i by zero
LrContinue linear decline, be stored in resonant inductance L
rEnergy pass through T
rBe released to load.Work as i
LrDrop to exciting curent i
mThe time, this pattern stops, i.e. t=t
4Pattern 5 (t
4～t
5) at t=t
4The time, i
LrDrop to exciting curent i
mThis moment T
rCross-pressure is zero, diode D
1With D
4End D
2Conducting, exciting curent i
mBy primary side and secondary side through S
rCirculation, but owing to generally design exciting curent all much smaller than load current, so can be with the auxiliary switch S that flows through
rElectric current be considered as zero current.As t 〉=t
4The time, can close auxiliary switch S
rThe zero current switching (ZCS) of finishing that makes ends, and makes auxiliary switch end, and this pattern stops, i.e. t=t
5Pattern 6 (t
5～t
6): at t=t
5Season, auxiliary switch ended, and entered pattern 6, at this moment the magnetizing inductance current i
mTo S
rParasitic capacitance C
SrCharging, v
SrVoltage rises, and works as v
SrVoltage rises to V
0The time, D
3With D
2Conducting, this pattern stops, i.e. t=t
6Mode 7 (t
6～t
7): work as v
SrVoltage is in t=t
6Rise to V
0The time, enter mode 7, at this moment D
3With D
2Conducting, magnetizing inductance L
mThere is a cross-pressure V
0, make the magnetizing inductance current i
mLinear decline worked as i
mWhen linearity drops to zero, T
rFinish replacement, this pattern stops, i.e. t=t
7Pattern 8 (t
7～t
8): work as i
mIn t=t
7When linearity drops to zero, enter pattern 8, diode D
3With D
2All end, this moment, main switch still continued conducting, and the inductance L storage power promptly enters the complete conducting of the main switch operational circumstances down of general voltage-boosting converter, when main switch by the time, this pattern termination, i.e. t=t
8Pattern 9 (t
8～t
9): when main switch in t=t
8When ending, enter pattern 9, decide electric current I this moment
iTo resonant capacitor C
SaCharging makes the linear rising of switching voltage, when capacitance voltage reaches output voltage V
oThe time, this pattern stops, diode D
aConducting, v at this moment
Sa=V
oGet back to pattern 0, be the beginning of another switching cycle.
According to above-mentioned analysis, this paper carried adds auxiliary circuit, can make main switch finish the characteristic of zero voltage switching (ZVS) when conducting, and auxiliary switch is soft conducting when conducting, by the time finish the characteristic that zero current switches (ZCS); In like manner, when input current is negative half-cycle, input current another branch road of flowing through, utilize identical auxiliary circuit to make it reach the characteristic of no-voltage, zero current switching, therefore, the no bridge type soft switch circuit of being carried can effectively improve the switch cost of contactor, and then promote the efficient of transducer.
By above detailed description, can make and know this skill person and understand that the present invention can reach aforementioned purpose really, met the regulation of Patent Law, patent application is proposed.
The above only is preferred embodiment of the present invention, when not limiting scope of the invention process with this; So all simple equivalent of doing according to the present patent application claim and description change and modify, all should still belong in the scope that patent of the present invention contains.
Claims (13)
1. the soft switch circuit of a power supply unit comprises:
One no bridge type rectification circuit, this no bridge type rectification circuit includes at least one filter inductance, two main switches, two diodes and an electric capacity, wherein this filter inductance connects the anode of first diode, and the negative electrode of first diode connects the negative electrode of second diode again, the anode of this second diode connects the drain electrode of first main switch, and the source electrode of first main switch connects the source electrode formation series connection of second main switch again, the source electrode of the negative electrode of these two diodes and two a main switches electric capacity in parallel, the anode of electric capacity is connected with the negative electrode of diode, and the negative electrode of electric capacity is connected with the source electrode of main switch, to reduce the conducting loss;
One auxiliary circuit, this auxiliary circuit is connected in the no bridge type rectification circuit, and this auxiliary circuit comprises at least one resonant inductance, an auxiliary switch, at least two diodes and a voltage source circuit, wherein the negative electrode of these two diodes connection resonant inductance is connected with voltage source circuit again, and voltage source circuit connects the drain electrode of auxiliary switch again.
2. the soft switch circuit of power supply unit as claimed in claim 1, wherein the filter inductance of this no bridge type rectification circuit is the manifold type filter inductance.
3. the soft switch circuit of power supply unit as claimed in claim 1, wherein the filter inductance of this no bridge type rectification circuit is non-manifold type filter inductance.
4. the soft switch circuit of power supply unit as claimed in claim 1, wherein the auxiliary switch of the main switch of this no bridge type rectification circuit and auxiliary circuit is that metal-oxide semiconductor (MOS) shunt capacitance and diode form.
5. the soft switch circuit of power supply unit as claimed in claim 1 wherein forms for igbt shunt capacitance and diode in the auxiliary switch of the main switch of this no bridge type rectification circuit and auxiliary circuit.
6. the soft switch circuit of power supply unit as claimed in claim 1 wherein further is provided with resonant capacitance in this auxiliary circuit, and this resonant capacitance is parallel to this auxiliary switch.
7. the soft switch circuit of power supply unit as claimed in claim 1 wherein further includes parasitic capacitance in the auxiliary switch of the main switch of this no bridge type rectification circuit and auxiliary circuit.
8. the soft switch circuit of power supply unit as claimed in claim 1, wherein the voltage source circuit of this auxiliary circuit is to be the self coupling full-bridge transformer circuit that the subtractive polarity state connects, this self coupling full-bridge transformer circuit is made up of the transformer that four diodes and are the connection of subtractive polarity state, one of them connecting pin of this transformer is connected to the anode of the 3rd diode and the negative electrode of the 4th diode, one of them connecting pin of transformer is connected to the anode of the 5th diode and the negative electrode of the 6th diode, the negative electrode of the 3rd diode is connected with the negative electrode of the 5th diode, and the anode of the 4th diode is connected with the anode of the 6th diode.
9. the soft switch circuit of power supply unit as claimed in claim 1, wherein the voltage source circuit of this auxiliary circuit is to be the self coupling full-bridge transformer circuit that the additive polarity state connects, this self coupling full-bridge transformer circuit is made up of the transformer that four diodes and are the connection of additive polarity state, one of them connecting pin of this transformer is connected to the anode of the 7th diode and the negative electrode of the 8th diode, one of them connecting pin of transformer is connected to the anode of the 9th diode and the negative electrode of the tenth diode, the negative electrode of the 7th diode is connected with the negative electrode of the 9th diode, and the anode of the 8th diode is connected with the anode of the tenth diode.
10. the soft switch circuit of power supply unit as claimed in claim 1, wherein the voltage source circuit of this auxiliary circuit is to be the transformer circuit that the additive polarity state connects, this transformer circuit is made up of the transformer that two diodes and are the connection of additive polarity state, one of them connecting pin of this transformer is connected to the anode of the 11 diode, one of them connecting pin of transformer is connected to the anode of the 12 diode, and the negative electrode of the 11 diode is connected with the negative electrode of the 12 diode.
11. the soft switch circuit of power supply unit as claimed in claim 1, wherein the voltage source circuit of this auxiliary circuit is to be the autotransformer circuit that the subtractive polarity state connects, this autotransformer circuit is made up of a diode, a resistance, an electric capacity and a subtractive polarity transformer, this resistance and this electric capacity are connected in parallel and are connected to one of them connecting pin of this transformer, this resistance and this electric capacity are connected in parallel and are connected to the 13 utmost point tube cathode, and the 13 diode anode is connected to one of them connecting pin of this transformer.
12. the soft switch circuit of power supply unit as claimed in claim 1, wherein the voltage source circuit of this auxiliary circuit is to be the autotransformer circuit that the additive polarity state connects, this autotransformer circuit is made up of a diode, a resistance, an electric capacity and an additive polarity transformer, this resistance and this electric capacity are connected in parallel and are connected to one of them connecting pin of this transformer, this resistance and this electric capacity are connected in parallel and are connected to the 14 diode cathode, and the 14 diode anode is connected to one of them connecting pin of this transformer.
13. the soft switch circuit of power supply unit as claimed in claim 1, wherein the voltage source circuit of this auxiliary circuit is the center tap transformer circuit, this center tap transformer circuit is made up of two diodes and a center tap transformer, this transformer wherein two groups of coils is connected in series, one of them connecting pin of this transformer is connected to the anode of the 15 diode, one of them connecting pin of this transformer is connected to the anode of the 16 diode, and the negative electrode of the 15 diode is connected with the negative electrode of the 16 diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100862747A CN100553099C (en) | 2007-03-13 | 2007-03-13 | The soft switch circuit of power supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100862747A CN100553099C (en) | 2007-03-13 | 2007-03-13 | The soft switch circuit of power supply unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101267165A CN101267165A (en) | 2008-09-17 |
| CN100553099C true CN100553099C (en) | 2009-10-21 |
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ID=39989363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100862747A Expired - Fee Related CN100553099C (en) | 2007-03-13 | 2007-03-13 | The soft switch circuit of power supply unit |
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| Country | Link |
|---|---|
| CN (1) | CN100553099C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11601036B2 (en) | 2021-04-16 | 2023-03-07 | Delta Electronics, Inc. | AC-DC power conversion system with zero voltage switching |
-
2007
- 2007-03-13 CN CNB2007100862747A patent/CN100553099C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11601036B2 (en) | 2021-04-16 | 2023-03-07 | Delta Electronics, Inc. | AC-DC power conversion system with zero voltage switching |
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| Publication number | Publication date |
|---|---|
| CN101267165A (en) | 2008-09-17 |
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