CN1499703A - Soft switching circuit without absorption loss - Google Patents

Soft switching circuit without absorption loss Download PDF

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Publication number
CN1499703A
CN1499703A CNA021452199A CN02145219A CN1499703A CN 1499703 A CN1499703 A CN 1499703A CN A021452199 A CNA021452199 A CN A021452199A CN 02145219 A CN02145219 A CN 02145219A CN 1499703 A CN1499703 A CN 1499703A
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China
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diode
capacitor
switching tube
circuit
inductance
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CN100342631C (en
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钱龙圣
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Qiandaohu Hengyuan Electric Co., Ltd., Hangzhou
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QIANDAOHU HENGYUAN ELECTRIC CO Ltd HANGZHOU
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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

The invention modifies circuit structure with no absorption loss in existed soft switching as follows. In BOOST boosted circuit, a branch circuit composed of cascaded diode D2, D3 and D4 is connected to two ends of freewheeling diode D1 in BOOST circuit in parallel. One end of resonance branch circuit composed of capacitance C2 and inductance L2 is connected to positive end of diode D1, and the other end of the resonance branch circuit is connected to between diode D3 and D4. One end of capacitance C3 is connected between diode D2 and D3, and the other end is connected to end of cathode of switching tube. If needed, circuit with no absorption loss of positive/negative excited convertor can be added to modified circuit.

Description

The soft switch circuit of lossless absorption
Technical field
The present invention relates to a kind of soft switch circuit, especially relate to a kind of improvement the existing lossless absorption circuit structure of soft switch.When needing, also can on its circuit, set up the lossless absorption circuit of positive and negative exciting converter, further to improve this circuit performance.
Background technology
Absorb the switch stress that circuit often is used to reduce switch element.Switch stress comprises switching loss, rush of current and due to voltage spikes.Hard switching exists the main cause of loss to be because opening of intersect producing of voltage and current, turn-off power loss.And soft switch is when opening, and the electric current rising of starting from scratch so there is not turn-on consumption, during shutoff, reduces the turn-off power loss and the due to voltage spikes of switch by the rate of climb of deboost.Patent retrieval finds that the someone has applied for the patent (97103647.0) of " active absorption circuit for soft switch " by name, and this soft switch element comprises a main switch element and an active absorption circuit for soft switch.Active absorption circuit has guaranteed efficient, reliable circuit working for an extra switch in main switch element and the active absorption circuit provides soft switching characteristic.Active absorption circuit can be realized intelligent soft switch element by additional control.The patent (01118936.3) that also has a kind of " Zero-voltage zero-current soft-switch converter " by name, it discloses a kind of Zero-voltage zero-current soft-switch converter, comprise the basic circuit that has master power switch and power diode, also comprise auxiliary power switch, the or two, diode, resonant capacitance, resonant inductance.It is characterized in that: between the energy storage inductor of boost inverter and power diode, seal in resonant inductance, make the current stress when loss of converter master power switch and power diode turn-off greatly reduce, simultaneously, realized the soft switch of master power switch, auxiliary power switch and booster diode.But, existing this class soft switch circuit or auxiliary switching circuit that need be extra, number of elements is many, complex structure, cost of manufacture height; The circuit energy loss is big, inefficiency, the bad deficiency that waits of reliability.
Summary of the invention
The present invention solves existing in prior technology circuit structure complexity, needs extra auxiliary switching circuit, and number of elements is many, the cost of manufacture height, and the circuit energy loss is big, inefficiency, the technical problem of the bad grade of reliability.
The present invention also solves the existing in prior technology soft switch circuit simultaneously or needs extra auxiliary switching circuit, and number of elements is many, circuit complexity, cost of manufacture height, poor reliability; The circuit energy loss is big, causes the technical problem of circuit working decrease in efficiency etc.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: in the BOOST booster circuit, by diode D 2, diode D 3With diode D 4The branch road that series aiding connection forms is attempted by the sustained diode in the described BOOST circuit in the same way 1Two ends; And by capacitor C 2And inductance L 2The resonance branch road one of series connection is terminated at diode D 1Positive pole, the other end is connected to diode D 3With diode D 4Between; And at diode D 2With diode D 3Between be connected to capacitor C 3An end, capacitor C 3The other end is connected to the cathode terminal of switching tube.
As preferably, also continued access has the H type network that is made of electric capacity, inductance and diode in the rear end of described BOOST circuit, is arranged in the DC to DC converter of potential isolation, wherein the diode D of serial connection in the same way 6With diode D 7Anode with the input power supply negative terminal join, its negative terminal with the input power supply anode link to each other; At described diode D 7With diode D 6Between be connected to inductance L 6An end, inductance L 6The other end be connected to diode D 8Positive pole and capacitor C 7An end, capacitor C 7The other end and switching tube Q 2Anode join; And diode D 8The positive potential end of negative pole when being connected to the primary coil excitation of transformer.
As preferably, described capacitor C 4Significantly greater than capacitor C 2, capacitor C 2Significantly greater than capacitor C 3, that is: C 4＞＞C 2＞＞C 3
As preferably, described switching tube Q is a metal-oxide-semiconductor, igbt, the controlled shutoff transistor of gate pole or bipolar transistor.
As preferably, in described diode D 8Negative pole and another switching tube Q 1Negative electrode join and this switching tube Q 1Anode with the input power supply anode link to each other.
As preferably, described diode D 6Negative terminal and diode D 8Negative terminal be connected to the input power supply anode.
As preferably, described switching tube Q 2Negative electrode and the positive potential end during the primary coil excitation between go back forward and be serially connected with diode D 10
As preferably, negative potential end and another switching tube Q during described primary coil excitation 1Anode between also oppositely be serially connected with diode D 9
As preferably, the resonance half period T/2 of described resonance branch road is much smaller than the switch half period T of this contactor pipe 0/ 2.
Therefore, the present invention has that circuit structure is simple, rationally distributed, and add ons quantity is few, need not extra testing circuit and control circuit, and does not have the energy loss element in the circuit, can improve characteristics such as the operating efficiency of soft switch circuit and electric-saving efficiency.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present invention;
Accompanying drawing 2 is a kind of dual switch positive activation type structural representations of the present invention;
Accompanying drawing 3 is a kind of single switching tube positive activation type structural representations of the present invention;
Accompanying drawing 4 is a kind of dual switch inverse-excitation type structural representations of the present invention;
Accompanying drawing 5 is a kind of single switching tube inverse-excitation type structural representations of the present invention.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: a kind of soft switch circuit of lossless absorption, be used for the BOOST booster circuit, and structure is that alternating current is through electric bridge BR 1Rectification is by energy storage inductor L 1Capacitor C 1The circuit of forming inserts switching tube Q then, and switching tube Q one end is done the switch negative pole, by diode D 2, diode D 3With diode D 4The branch road that series aiding connection forms is attempted by the sustained diode in the described BOOST circuit in the same way 1Two ends; And by capacitor C 2And inductance L 2The resonance branch road one of series connection is terminated at diode D 1Positive pole, the other end is connected to diode D 3With diode D 4Between; And at diode D 2With diode D 3Between be connected to capacitor C 3An end, capacitor C 3The other end is connected to the cathode terminal of switching tube.Wherein, capacitor C 2With inductance L 2Resonance half period much smaller than switch half period of BOOST circuit main switch Q.
Referring to accompanying drawing 1, when switching tube Q opens, capacitor C 3On electric charge by diode D 3Through inductance L 2, capacitor C 2, switching tube Q discharge is because of diode D 3Can only unilateal conduction, so capacitor C 3On electric charge enter C 2, after a period of time, U C3=0.Again the moment of just having opened, pass through inductance L because of switching tube Q 1And inductance L 2Electric current all be zero, or near zero, so switching tube Q is the zero current unlatching.When switching tube Q turn-offed, the electric current of the Q that flows through was through diode D 2Give capacitor C 3Charging because of capacitance terminal voltage can not suddenly change, is turn-offed so switching tube Q is a no-voltage; When switching tube turn-offed fully, the A point voltage rose to U 0, at this moment, capacitor C 2On electric charge through inductance L 2, diode D 4, switching tube Q (anti-and diode) discharge, electric charge enters output storage capacitor C 4, capacitor C 2During discharge off, U C2=0, for next switch periods is prepared.Be stored in capacitor C 3On electric charge enter capacitor C 2After, according to the conservation of energy,  C is arranged 2U C2 2= C 3U C3 2Set up.Because of C 2＞＞C 3So, U C2＜＜U C3C again 2＜＜C 4So, on electric charge can put into C fully 4, and to C 4The influence of terminal voltage is very little.Predict through actual tests, increase this T type network, the switching circuit overall efficiency can improve (1～1.5) %.
When needing, also can be provided with a kind of lossless absorption circuit in the rear end of foregoing circuit, this circuit is used for positive activation type or inverse excitation type converter, and it is the H type network that is made of electric capacity, inductance and diode.This network can be used for dual switch positive activation type switching circuit, can also be used for single switching tube positive activation type circuit and single, double switching tube switch flyback switch circuit.Physical circuit exemplifies as follows:
Embodiment 2: diode D 6With diode D 7Be connected in series diode D in the same way 6Negative terminal with the input power supply anode link to each other diode D 7Anode with the input power supply negative terminal join, at described diode D 6With diode D 7Between be connected to inductance L 6An end, inductance L 6The other end be connected to diode D 8Positive pole and capacitor C 7An end, capacitor C 7The other end and the negative potential end during the primary coil excitation of transformer join, again with switching tube Q 2Anode join switching tube Q 2Negative electrode join with the input power supply negative terminal, go back forward serial connection diode D afterwards 10Positive potential end when being connected to the primary coil excitation of transformer again, diode D 8The positive potential end of negative pole when being connected to the primary coil excitation of transformer, diode D 8Negative pole again with another switching tube Q 1Negative electrode join and this switching tube Q 1Anode link to each other with the anode of input power supply, also oppositely be connected in series diode D afterwards 9Negative potential end when being connected to the primary coil excitation of transformer, wherein, by inductance L 6With capacitor C 7The half period T/2 of the resonant circuit of forming is much smaller than switching tube Q 1Switch periods T 0(with reference to the accompanying drawings 2).
Its course of work is as follows: if capacitor C when last switch periods finishes 7On voltage be-U i(the B point is for negative, F point for just) is as switching tube Q 1, Q 2During conducting simultaneously, capacitor C 7On electric charge through switching tube Q 2, diode D 7, inductance L 6Discharge resonance is because of diode D 7Unilateral conduction, capacitor C 7With inductance L 6Resonance ad infinitum, and the half period of can only vibrating, capacitor C 7Final voltage be+U i(the B point is for just, and the F point is for negative) is because of switching tube Q 2, Q 1In the moment of just having opened, electric current is zero or approaching zero, so switching tube Q 2, Q 1For zero current is opened.As switching tube Q 2, Q 1When turn-offing simultaneously (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, switching tube Q flows through before the shutoff 2, Q 1Electric current be made as I m, through diode D 8, give capacitor C 7Charging is again because of capacitance terminal voltage can not suddenly change, so switching tube Q 2, Q 1For no-voltage is turn-offed.As switching tube Q 2, Q 1When turn-offing fully, capacitor C 7On voltage be-U i, this is because because clamp diode D 9, D 10Existence, if  L 0I m 2＞ C 2U i 2, then unnecessary energy is through diode D 9, D 10Play back to capacitor C 4, prepare for next switch periods simultaneously.In addition, because diode D 7There is minimum junction capacitance, its meeting and inductance L 6Produce slight extremely high frequency vibration, so should take to use diode D 6The measure of amplitude limit.Record through actual tests, increased this H type network in general efficient and improved (3～3.5) %.
Embodiment 3: diode D 6With diode D 7Be connected in series diode D in the same way 6Negative terminal with the input power supply anode link to each other diode D 7Anode with the input power supply negative terminal join, at described diode D 6With diode D 7Between be connected to inductance L 6An end, inductance L 6The other end be connected to diode D 8Positive pole and capacitor C 7An end, capacitor C 7The other end and the negative potential end during the primary coil excitation of transformer join, again with switching tube Q 2Anode join switching tube Q 2Negative electrode join with the input power supply negative terminal, the anode of magnetic reset coil (during the primary coil excitation) is connected to the negative terminal of input power supply, the negative terminal of magnetic reset coil (during the primary coil excitation) forward serial connection diode D 9, be connected to the anode of importing power supply afterwards again, diode D 8Negative pole be connected to the anode of input power supply, the positive potential end when being connected to the primary coil excitation of transformer afterwards again, wherein, by inductance L 1With capacitor C 2The half period T/2 of the resonant circuit of forming is much smaller than switching tube Q 2Switch periods T 0(with reference to the accompanying drawings 3).
Its course of work is as follows: if capacitor C when last switch periods finishes 7On voltage be-U i(the B point is for negative, F point for just) is as switching tube Q 2During conducting, capacitor C 7On electric charge through switching tube Q 2, diode D 7, inductance L 6Discharge resonance is because of diode D 7Unilateral conduction, capacitor C 7With inductance L 6Resonance ad infinitum, and the half period of can only vibrating, capacitor C 7Final voltage be+U i(the B point is for just, and the F point is for negative) is because of switching tube Q 2In the moment of just having opened, electric current is zero or approaching zero, so switching tube Q 2For zero current is opened.As switching tube Q 2During shutoff (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, switching tube Q flows through before the shutoff 2Electric current be made as I m, through diode D 7, give capacitor C 7Charging is again because of capacitance terminal voltage can not suddenly change, so switching tube Q 2For no-voltage is turn-offed.As switching tube Q 2When turn-offing fully, capacitor C 7On voltage be-U i, this is because because clamp diode D 9Existence, if  L 0I m 2＞ C 7U i 2, then unnecessary energy is through diode D 9Play back to capacitor C 4, prepare for next switch periods simultaneously.In addition, because diode D 7There is minimum junction capacitance, its meeting and inductance L 6Produce slight extremely high frequency vibration, so should take to use diode D 6The measure of amplitude limit.Through actual measurement, increased this H type network in general efficient and can improve (3～3.5) %.
Embodiment 4: diode D 6With diode D 7Be connected in series diode D in the same way 6Negative terminal with the input power supply anode link to each other diode D 7Anode with the input power supply negative terminal join, at described diode D 6With diode D 7Between be connected to inductance L 6An end, inductance L 7The other end be connected to diode D 8Positive pole and capacitor C 7An end, capacitor C 7The other end and the negative potential end during the primary coil excitation of transformer join, again with switching tube Q 2Anode join switching tube Q 2Negative electrode with the input power supply negative terminal join diode D 8The positive potential end of negative pole when being connected to the primary coil excitation of transformer, diode D 8Negative pole again with another switching tube Q 1Negative electrode join and this switching tube Q 1Anode with the input power supply anode link to each other, wherein, by inductance L 6With capacitor C 7The half period T/2 of the resonant circuit of forming is much smaller than switching tube Q 2Switch periods T 0(with reference to the accompanying drawings 4).
Its course of work is as follows: if capacitor C when last switch periods finishes 7On voltage be-U i(the B point is for negative, F point for just) is as switching tube Q 2, Q 1During conducting simultaneously, capacitor C 7On electric charge through switching tube Q 2, diode D 7, inductance L 6Discharge resonance is because of diode D 7Unilateral conduction, capacitor C 7With inductance L 6Resonance ad infinitum, and the half period of can only vibrating, capacitor C 7Final voltage be+U i(the B point is for just, and the F point is for negative) is because of switching tube Q 2, Q 1In the moment of just having opened, electric current is zero or approaching zero, so switching tube Q 2, Q 1For zero current is opened.As switching tube Q 2, Q 1When turn-offing simultaneously (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, switching tube Q flows through before the shutoff 2, Q 1Electric current be made as I m, through diode D 8, give capacitor C 7Charging is again because of capacitance terminal voltage can not suddenly change, so switching tube Q 2, Q 1For no-voltage is turn-offed.As switching tube Q 2, Q 1When turn-offing fully, capacitor C 2On voltage be-U i, if  L 0I m 2＞ C 7U i 2, then unnecessary energy plays back to capacitor C 4, prepare for next switch periods simultaneously.In addition, because diode D 7There is minimum junction capacitance, its meeting and inductance L 6Produce slight extremely high frequency vibration, so should take to use diode D 6The measure of amplitude limit.Record through actual tests, increased this H type network in general efficient and improved (3～3.5) %.
Embodiment 5: diode D 6With diode D 7Be connected in series diode D in the same way 6Negative terminal with the input power supply anode link to each other diode D 7Anode with the input power supply negative terminal join, at described diode D 6With diode D 7Between be connected to inductance L 6An end, inductance L 6The other end be connected to diode D 8Positive pole and capacitor C 7An end, capacitor C 7The other end and the negative potential end during the primary coil excitation of transformer join, again with switching tube Q 2Anode join switching tube Q 2Negative electrode with the input power supply negative terminal join diode D 8Negative pole be connected to the anode of input power supply, the positive potential end when being connected to the primary coil excitation of transformer again, wherein, by inductance L 6With capacitor C 7The half period T/2 of the resonant circuit of forming is much smaller than switching tube Q 2Switch periods T 0(with reference to the accompanying drawings 5).
Its course of work is as follows: if capacitor C when last switch periods finishes 7On voltage be-U i(the B point is for negative, F point for just) is as switching tube Q 2During conducting, capacitor C 7On electric charge through switching tube Q 2, diode D 7, inductance L 6Discharge resonance is because of diode D 7Unilateral conduction, capacitor C 7With inductance L 6Resonance ad infinitum, and the half period of can only vibrating, capacitor C 7Final voltage is+U i(the B point is for just, and the F point is for negative) is because of switching tube Q 2In the moment of just having opened, electric current is zero or approaching zero, so switching tube Q 2For zero current is opened.As switching tube Q 2During shutoff (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, switching tube Q flows through before the shutoff 2Electric current be made as I m, through diode D 8Give capacitor C 7Electricity is again because of capacitance terminal voltage can not suddenly change, so switching tube Q 2For no-voltage is turn-offed.As switching tube Q 2When turn-offing fully, capacitor C 7Voltage be-U i, if  L 0I m 2＞ C 7U i 2, then unnecessary energy is through playing back to capacitor C 4, prepare for next switch periods simultaneously.In addition, because diode D 7In minimum junction capacitance, its meeting and inductance L 6Give birth to slight extremely high frequency vibration, so should take to use diode D 6The measure of the width of cloth.Record through actual tests, increased this H type network in general efficient and improved (3～3.5) %.

Claims (10)

1. the soft switch circuit of a lossless absorption is arranged at the BOOST booster circuit, it is characterized in that by diode D 2, diode D 3With diode D 4The branch road that series aiding connection forms is attempted by the sustained diode in the described BOOST circuit in the same way 1Two ends; And by capacitor C 2And inductance L 2The resonance branch road one of series connection is terminated at diode D 1Positive pole, the other end is connected to diode D 3With diode D 4Between; And at diode D 2With diode D 3Between be connected to capacitor C 3An end, capacitor C 3The other end is connected to the cathode terminal of switching tube.
2. the soft switch circuit of lossless absorption according to claim 1, it is characterized in that in the rear end of described BOOST circuit also continued access has the H type network that is made of electric capacity, inductance and diode, be arranged in the DC to DC converter of potential isolation, wherein the diode D that is connected in series in the same way 6With diode D 7Anode with the input power supply negative terminal join, its negative terminal with the input power supply anode link to each other; At described diode D 7With diode D 6Between be connected to inductance L 6An end, inductance L 6The other end be connected to diode D 8Positive pole and capacitor C 7An end, capacitor C 7The other end and switching tube Q 2Anode join; And diode D 8The positive potential end of negative pole when being connected to the primary coil excitation of transformer.
3. the soft switch circuit of lossless absorption according to claim 1 and 2 is characterized in that described capacitor C 4Significantly greater than capacitor C 2, capacitor C 2Significantly greater than capacitor C 3, that is: C 4＞＞C 2＞＞C 3
4. the soft switch circuit of lossless absorption according to claim 1 and 2 is characterized in that described switching tube is a metal-oxide-semiconductor, igbt, the controlled shutoff transistor of gate pole or bipolar transistor.
5. the soft switch circuit of lossless absorption according to claim 1 and 2 is characterized in that described diode D 8Negative pole and another switching tube Q 1Negative electrode join and this switching tube Q 1Anode with the input power supply anode link to each other.
6. the soft switch circuit of lossless absorption according to claim 1 and 2 is characterized in that described diode D 6Negative terminal and diode D 8Negative terminal be connected to the input power supply anode.
7. the soft switch circuit of lossless absorption according to claim 1 and 2 is characterized in that described switching tube Q 2Negative electrode and the positive potential end during the primary coil excitation between go back forward and be serially connected with diode D 10
8. the soft switch circuit of lossless absorption according to claim 1 and 2, negative potential end and another switching tube Q when it is characterized in that described primary coil excitation 1Anode between also oppositely be serially connected with diode D 9
9. the soft switch circuit of lossless absorption according to claim 7, negative potential end and another switching tube Q when it is characterized in that described primary coil excitation 1Anode between also oppositely be serially connected with diode D 9
10. the soft switch circuit of lossless absorption according to claim 1 and 2 is characterized in that the switch half period T of the resonance half period T/2 of described resonance branch road much smaller than this contactor pipe 0/ 2.
CNB021452199A 2002-11-08 2002-11-08 Soft switching circuit without absorption loss Expired - Fee Related CN100342631C (en)

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CN100448154C (en) * 2005-07-14 2008-12-31 艾默生网络能源有限公司 Switch power supply and its lossless absorption circuit
CN102158090A (en) * 2011-03-04 2011-08-17 浙江大学 Boost converter with built-in transformer and voltage-doubling unit of switching capacitor
CN1956304B (en) * 2005-10-28 2011-08-24 中兴通讯股份有限公司 Inhibition method for diode reverse recovery current and its circuit
CN103368401A (en) * 2012-04-09 2013-10-23 星博电子股份有限公司 Power supply conversion device with control switch
CN104052268A (en) * 2013-03-12 2014-09-17 富士电机株式会社 DC voltage conversion circuit
CN104079168A (en) * 2013-03-28 2014-10-01 日本电波工业株式会社 Step up circuit and radiation meter
CN104917380A (en) * 2014-12-12 2015-09-16 武汉绿鼎天舒科技发展有限公司 Control method for realizing low-voltage switch stress
CN109120142A (en) * 2018-11-05 2019-01-01 宁波市北仑临宇电子科技有限公司 The lossless synchronous absorbing circuit of peak voltage, boosting and step-down switching power supply circuit
CN109217660A (en) * 2017-06-30 2019-01-15 株洲中车时代电气股份有限公司 Dc/dc boost converter
CN109687718A (en) * 2019-02-26 2019-04-26 珠海格力电器股份有限公司 Flyback sourse circuit
CN112383212A (en) * 2020-09-25 2021-02-19 华东光电集成器件研究所 Voltage spike noise lossless absorption circuit
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US5307004A (en) * 1992-07-06 1994-04-26 Carsten Bruce W Soft switching boost and buck regulators
JP2835899B2 (en) * 1992-12-17 1998-12-14 大平電子株式会社 Soft-switching circuit of discontinuous switching power supply in discontinuous current mode
CN2602543Y (en) * 2002-11-08 2004-02-04 钱龙圣 Soft switch circuit without depletion absorption

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CN100448154C (en) * 2005-07-14 2008-12-31 艾默生网络能源有限公司 Switch power supply and its lossless absorption circuit
CN1956304B (en) * 2005-10-28 2011-08-24 中兴通讯股份有限公司 Inhibition method for diode reverse recovery current and its circuit
CN102158090A (en) * 2011-03-04 2011-08-17 浙江大学 Boost converter with built-in transformer and voltage-doubling unit of switching capacitor
CN103368401A (en) * 2012-04-09 2013-10-23 星博电子股份有限公司 Power supply conversion device with control switch
CN103368401B (en) * 2012-04-09 2015-07-08 星博电子股份有限公司 Power supply conversion device with control switch
CN104052268A (en) * 2013-03-12 2014-09-17 富士电机株式会社 DC voltage conversion circuit
CN104052268B (en) * 2013-03-12 2019-03-19 富士电机株式会社 DC voltage converting circuit
CN104079168A (en) * 2013-03-28 2014-10-01 日本电波工业株式会社 Step up circuit and radiation meter
CN104917380B (en) * 2014-12-12 2018-11-02 张乙乙 A kind of control method for realizing low-voltage switches stress
CN104917380A (en) * 2014-12-12 2015-09-16 武汉绿鼎天舒科技发展有限公司 Control method for realizing low-voltage switch stress
CN109217660A (en) * 2017-06-30 2019-01-15 株洲中车时代电气股份有限公司 Dc/dc boost converter
CN109217660B (en) * 2017-06-30 2021-04-27 株洲中车时代电气股份有限公司 DC/DC boost converter
CN109120142A (en) * 2018-11-05 2019-01-01 宁波市北仑临宇电子科技有限公司 The lossless synchronous absorbing circuit of peak voltage, boosting and step-down switching power supply circuit
CN109687718A (en) * 2019-02-26 2019-04-26 珠海格力电器股份有限公司 Flyback sourse circuit
CN112383212A (en) * 2020-09-25 2021-02-19 华东光电集成器件研究所 Voltage spike noise lossless absorption circuit
CN112928913A (en) * 2021-01-27 2021-06-08 苏州海鹏科技有限公司 Buck conversion circuit and lossless absorption circuit thereof

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