CN206452302U

CN206452302U - Asymmetrical half-bridge circuit of reversed excitation

Info

Publication number: CN206452302U
Application number: CN201621335142.4U
Authority: CN
Inventors: 郑凌霄; 宋建峰; 冯刚
Original assignee: Mornsun Guangzhou Science and Technology Ltd
Current assignee: Mornsun Guangzhou Science and Technology Ltd
Priority date: 2016-12-07
Filing date: 2016-12-07
Publication date: 2017-08-29
Anticipated expiration: 2026-12-07

Abstract

The utility model discloses a kind of asymmetrical half-bridge circuit of reversed excitation, two or more independent resonant tanks are included.In main switch conducting, when clamping switch tube ends, the inductance in all resonant tanks, electric capacity series connection occurs resonance, is magnetizing inductance energy storage, while realizing that ZVS provides condition for clamping switch tube together；When main switch cut-off, when clamping switch tube is turned on, each resonant tank independent resonant is that secondary releases energy, while realizing that ZVS provides condition for main switch.In wide scope, the application of the Switching Power Supply of high input voltage, compared with prior art, it has Sofe Switch function, improves the efficiency of product；And primary side switch pipe voltage stress in cut-off is low, it is not necessary to select special high withstand voltage switching tube, reduce cost.

Description

Asymmetrical half-bridge circuit of reversed excitation

Technical field

The utility model is related to switch converters field, more particularly to asymmetrical half-bridge flyback switch converters.

Background technology

The field of power electronics is developed rapidly so that the application of high frequency switch power is more and more extensive.Traditional industry and The input of domestic switch power supply is frequently necessary to from power network power taking, after the current rectifying and wave filtering circuit of power source internal, becomes higher Direct current, then be input to circuit for power conversion, become low-voltage DC, electric energy is provided for load.In order to adapt to country variant Power network standard, the Switching Power Supply of general two cross streams input, its input voltage range is 85VAC~264VAC, rectifying and wave-filtering DC voltage afterwards is about 120VDC~373VDC.For the Switching Power Supply of this occasion, according to the difference of power, for its selection Circuit topology it is more, such as have it is simple in construction, with low cost the features such as flyback, forward converter；It is complicated, but with soft The LLC of switching function, asymmetrical half-bridge, phase whole-bridging circuit etc..

With the fast development of New Energy Industry, the industry such as electric automobile, wind-power electricity generation, photovoltaic inputs electricity to superelevation ultra-wide Press the demand of the Switching Power Supply of scope more and more, and require more and more harsh.The electricity that the charging pile of electric automobile industry is used Source requires that input voltage range is 200VDC~800VDC, and some requirements reach the 1000VDC upper limits；Wind-power electricity generation and photovoltaic industry The power supply product requirement input voltage range that uses such as photovoltaic combiner box, inverter reach 150VDC~1500VDC.So wide model Enclose, the application of high input voltage improves the design difficulty of Switching Power Supply, including the processing of switch tube voltage stress；Input voltage liter Height causes the loss that turns on and off of switching tube to increase, caused heat treatment；Transformer technological design etc..

Current industry wide scope, the Switching Power Supply of high input voltage are using common flyback or forward converter realization, its reality Application circuit is that transformer primary side power winding is divided into two or more, and switching tube is connect respectively, is then together in series again Reach high voltage bearing purpose (as depicted in figs. 1 and 2, the program is existing known technology to circuit, is no longer discussed in detail herein).But It is that both topologys are hard switchings, and leakage inductance energy can not be reclaimed, therefore limits the efficiency and volume of small-power product.And And, it is in being dfficult to apply in powerful wide scope, the Switching Power Supply of high input voltage.Because as the voltage caused by leakage inductance Spike stress and high input voltage cause switching tube to bear very high voltage stress；In addition it is hard switching, switching loss is very big, Pipe heating is serious, so more high withstand voltage, higher volume of switching tube must be selected, cost liter is sharply increased.And high withstand voltage Switching tube conduction impedance and junction capacity all than larger, are further degrading the efficiency of product.Particularly in recent years in the industry to bigger The demand of power high input voltage Switching Power Supply gradually increases, and the shortcoming that foregoing circuit topology is showed in the application scenario is outstanding To be obvious.Caused by power-efficient is low temperature rise and volume it is big and using cost caused by high withstand voltage switching tube it is high the problem of, sternly The development of high voltage power supply is constrained again.

Power electronics industry has derived soft open to the demand of the Switching Power Supply of high power density, high reliability and small size The development of pass technology.Soft switch technique is still one of hot technology of field of power electronics research at present.It is to utilize inductance, electricity Hold the principle of resonance, the switching tube of Switching Power Supply is realized that no-voltage is opened or zero-current switching, so as to reduce opening for switching tube Loss is closed, the efficiency of product has been obviously improved.But LLC and asymmetrical half-bridge etc. have the circuit of Sofe Switch function, by It is less than 0.5 in its duty-cycle requirement, and the stress of switching tube is equal to input voltage, so more difficult apply defeated in wide scope, height Enter in the Switching Power Supply of voltage, be typically connected to the pre- voltage stabilizing link of one-level in prime.Though and conventional asymmetrical half-bridge circuit of reversed excitation Right dutycycle can be more than 0.5, but the stress of its switching tube is equal to input voltage, therefore also not be suitable for the occasion of high input voltage. It is above known technology, is no longer discussed in detail here.

Utility model content

In view of this, the problem of the utility model is solves above-mentioned is applied to there is provided a kind of asymmetrical half-bridge circuit of reversed excitation In wide scope, the Switching Power Supply of high input voltage, it has Sofe Switch function, improves the efficiency of product；And primary side switch pipe Voltage stress is low when off, it is not necessary to selects special high withstand voltage switching tube, reduces cost.

The purpose of this utility model is achieved in that a kind of asymmetrical half-bridge circuit of reversed excitation, including input positive terminal, input Negative terminal, transformer, the primary circuit being connected with the primary side winding of transformer and the secondary electricity being connected with the vice-side winding of transformer Road, primary circuit includes the first electric capacity and the second electric capacity, and one end of the first electric capacity is connected with input positive terminal, the first electric capacity it is another End is connected with one end of the second electric capacity, and the other end of the second electric capacity is connected with input negative terminal；

Transformer has the first primary side winding and the second primary side winding of series connection, also with the first vice-side winding；

Primary circuit also includes：

Four switching tubes, i.e. first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube, four switching tubes Drain-source pole be sequentially connected in series between input positive terminal and input negative terminal, wherein based on first switch pipe and the 3rd switching tube Switching tube, and drive signal is synchronous；Second switch pipe and the 4th switching tube are clamping switch tube, and drive signal is synchronous；Master opens Close pipe complementary with clamping switch tube drive signal, and have a dead time between two drive signals；

Two inductance, i.e. the first inductance and the second inductance, are the leakage inductances of the primary side winding of transformer；

Two electric capacity, i.e. the 3rd electric capacity and the 4th electric capacity；

The Same Name of Ends of first primary side winding of transformer is connected by the first inductance with the drain electrode of second switch pipe, and first is former The different name end of side winding is connected with the source electrode of second switch pipe and the other end of the first electric capacity respectively by the 3rd electric capacity；Second is former The Same Name of Ends of side winding is connected by the second inductance with the drain electrode of the 4th switching tube, and the different name end of the second primary side winding passes through the 4th Electric capacity is connected with the source electrode of the 4th switching tube and the other end of the second electric capacity respectively；

Main switch conducting, clamping switch tube shut-off when, input voltage be applied to the first inductance, the first primary side winding, In the series loop that 3rd electric capacity, the second inductance, the second primary side winding and the 4th electric capacity are sequentially constituted, resonance is produced；Opened in master The first dead time that pipe and clamping switch tube all end is closed, the junction capacity of four switching tubes is concatenated loop and produces resonance, takes out The energy of clamp switch junction capacitance is taken, to realize that the no-voltage of clamping switch tube is open-minded；

In main switch shut-off, clamping switch tube conducting, the first inductance, the first primary side winding, the 3rd electric capacity and second Switching tube constitutes the first resonant tank；Second inductance, the second primary side winding, the 4th electric capacity and the 4th switching tube constitute the second resonance Loop；The second dead time all ended in main switch and clamping switch tube, the junction capacity of four switching tubes is concatenated loop Resonance is produced, the energy of main switch junction capacity is extracted, to realize that the no-voltage of main switch is open-minded.It is preferred that, the original Side circuit also includes first resistor, and first resistor is connected between the other end of the first electric capacity and the 3rd electric capacity.

It is preferred that, the transformer also has the 3rd primary side winding connected with the second primary side winding；The primary circuit Also include the 6th electric capacity, the 5th switching tube, the 6th switching tube, the 3rd inductance and the 7th electric capacity, one end and second of the 6th electric capacity The other end connection of electric capacity, the other end of the 6th electric capacity is connected with input negative terminal；5th switching tube and the 6th switching tube with it is described Four switching tubes are sequentially connected in series between input positive terminal and input negative terminal, wherein the 5th switching tube is main switch, the 6th Switching tube is clamping switch tube；The Same Name of Ends of the primary side winding of transformer the 3rd is connected by the drain electrode of the 3rd inductance and the 6th switching tube Connect, the different name end of the 3rd primary side winding is connected with the source electrode of the 6th switching tube and the other end of the 6th electric capacity respectively by the 7th electric capacity Connect；In main switch conducting, clamping switch tube shut-off, input voltage is applied to the first inductance, the first primary side winding, the 3rd electricity In the series loop that appearance, the second primary side winding, the 4th electric capacity, the 3rd primary side winding and the 7th electric capacity are sequentially constituted, resonance is produced； The first dead time all ended in main switch and clamping switch tube, the junction capacity of six switching tubes be concatenated loop produce it is humorous Shake, the energy of clamp switch junction capacitance is extracted, to realize that the no-voltage of clamping switch tube is open-minded；Main switch turn off, When clamping switch tube is turned on, the first primary side winding, the 3rd electric capacity and second switch pipe constitute the first resonant tank；Second primary side around Group, the 4th electric capacity and the 4th switching tube constitute the second resonant tank；3rd primary side winding, the 7th electric capacity and the 6th switching tube are constituted 3rd resonant tank；The second dead time all ended in main switch and clamping switch tube, the junction capacity warp of six switching tubes Series loop produces resonance, the energy of main switch junction capacity is extracted, to realize that the no-voltage of main switch is open-minded.It is preferred that , the primary circuit also includes first resistor and second resistance, and first resistor is connected on the other end and the 3rd of the first electric capacity Between electric capacity；Second resistance is connected between the other end of the second electric capacity and the 4th electric capacity.

It is preferred that, the secondary circuit of the asymmetrical half-bridge circuit of reversed excitation, including the first diode and the 5th electric capacity, first The one of the different name end connection of the anode of diode and the first vice-side winding of transformer, the negative electrode of the first diode and the 5th electric capacity End connection, output cathode is used as while drawing；The other end of 5th electric capacity is connected with the Same Name of Ends of the first vice-side winding, is drawn simultaneously Go out as output negative pole.

The utility model also provides a kind of asymmetrical half-bridge circuit of reversed excitation, including transformer, and the transformer includes first Primary side winding, the second primary side winding and the first vice-side winding；The asymmetrical half-bridge circuit of reversed excitation also includes the first diode, the One inductance, the second inductance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, first switch pipe, second Switching tube, the 3rd switching tube and the 4th switching tube, first switch pipe and the 3rd switching tube are main switch, and drive signal is same Step；Second switch pipe and the 4th switching tube are clamping switch tube, and drive signal is synchronous；Main switch drives with clamping switch tube Signal is complementary, and has a dead time between two drive signals, and its annexation is：First electric capacity and the second electric capacity string Connection, the termination input positive terminal of two-terminal one after series connection, while the drain electrode of first switch pipe is connect, another termination input negative terminal, simultaneously Connect the source electrode of the 4th switching tube；The source electrode of first switch pipe connects the drain electrode of second switch pipe；The source electrode of first switch pipe is gone back simultaneously It is connected to one end of the first inductance, the Same Name of Ends of the primary side winding of another termination first of the first inductance；First primary side winding it is different One end of name the 3rd electric capacity of termination；The source electrode of another termination second switch pipe of 3rd electric capacity, while being also attached to the first electric capacity Intermediate node after being connected with the second electric capacity, while being also attached to the drain electrode of the 3rd switching tube；The source electrode of 3rd switching tube connects The drain electrode of four switching tubes；The source electrode of 3rd switching tube is also attached to one end of the second inductance simultaneously；Another termination of second inductance The Same Name of Ends of second primary side winding of transformer；The different name of second primary side winding of transformer terminates one end of the 4th electric capacity；The The source electrode of the switching tube of another termination the 4th of four electric capacity；The other end of 4th electric capacity is also connected with input negative terminal.

It is preferred that, the transformer also has the 3rd primary side winding connected with the second primary side winding；The primary circuit Also include the 6th electric capacity, the 5th switching tube, the 6th switching tube, the 3rd inductance and the 7th electric capacity, wherein being opened based on the 5th switching tube Guan Guan, the 6th switching tube is clamping switch tube, and its annexation is：6th electric capacity is connected with the first electric capacity and the second electric capacity, string Two-terminal one after connection terminates the positive pole of input voltage, while connect the drain electrode of first switch pipe, another termination input voltage it is negative Pole, while connecing the source electrode of the 6th switching tube；The source electrode of the switching tube of another termination the 4th of 4th electric capacity, while being also attached to second Intermediate node after electric capacity and the series connection of the 6th electric capacity, while being also attached to the drain electrode of the 5th switching tube；The source electrode of 5th switching tube Connect the drain electrode of the 6th switching tube；The source electrode of 5th switching tube is also attached to one end of the 3rd inductance simultaneously；3rd inductance it is another Terminate the Same Name of Ends of the 3rd primary side winding of transformer；The different name of 3rd primary side winding of transformer terminates the one of the 7th electric capacity End；The source electrode of the switching tube of another termination the 6th of 7th electric capacity.

It is preferred that, the primary circuit also includes first resistor, and first resistor is connected on the other end and the of the 3rd electric capacity Between intermediate node after one electric capacity and the series connection of the second electric capacity.

It is preferred that, the primary circuit also includes first resistor and second resistance, and first resistor is connected on the 3rd electric capacity The other end connected with the first electric capacity and the second electric capacity after intermediate node between；Second resistance is connected on the other end of the 4th electric capacity Connect between the intermediate node after being connected with the second electric capacity and the 6th electric capacity.

It is preferred that, the secondary circuit, including the first diode and the 5th electric capacity, the anode and transformer of the first diode The first vice-side winding the connection of different name end, the negative electrode of the first diode is connected with one end of the 5th electric capacity, while extraction conduct Output cathode；The other end of 5th electric capacity is connected with the Same Name of Ends of the first vice-side winding, and output negative pole is used as while drawing.

The utility model also provides a kind of asymmetrical half-bridge circuit of reversed excitation, including transformer, and the transformer includes first Primary side winding, the second primary side winding and the first vice-side winding；The asymmetrical half-bridge circuit of reversed excitation also includes the first diode, the One inductance, the second inductance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, first switch pipe, second Switching tube, the 3rd switching tube and the 4th switching tube, first switch pipe and the 3rd switching tube are main switch, and drive signal is same Step；Second switch pipe and the 4th switching tube are clamping switch tube, and drive signal is synchronous；Main switch drives with clamping switch tube Signal is complementary, and has a dead time between two drive signals, and its annexation is：First electric capacity and the second electric capacity string Connection, the two-terminal one after series connection terminates the positive pole of input voltage, while the drain electrode of second switch pipe is connect, another termination input voltage Negative pole, while connecing the source electrode of the 3rd switching tube；Second switch, which drains, also connects one end of the first inductance；The other end of first inductance Connect the Same Name of Ends of the first primary side winding of transformer；The different name of first primary side winding of transformer terminates one end of the 3rd electric capacity； The source electrode of another termination second switch pipe of 3rd electric capacity, while being also attached to the drain electrode of first switch pipe；First switch pipe Source electrode connects the drain electrode of the 4th switching tube, while being also attached to the intermediate node after the first electric capacity and the series connection of the second electric capacity；4th opens The drain electrode for closing pipe is also attached to one end of the second inductance；Second primary side winding of another termination transformer of the second inductance it is of the same name End；The different name of second primary side winding of transformer terminates one end of the 4th electric capacity；The switching tube of another termination the 4th of 4th electric capacity Source electrode, while being also attached to the drain electrode of the 3rd switching tube.

It is preferred that, the transformer also has the 3rd primary side winding connected with the second primary side winding；The primary circuit Also include the 6th electric capacity, the 5th switching tube, the 6th switching tube, the 3rd inductance and the 7th electric capacity, wherein being opened based on the 5th switching tube Guan Guan, the 6th switching tube is clamping switch tube, and its annexation is：6th electric capacity is connected with the first electric capacity and the second electric capacity, string Two-terminal one after connection terminates the positive pole of input voltage, while connect the drain electrode of second switch pipe, another termination input voltage it is negative Pole, while connecing the source electrode of the 5th switching tube；The source electrode of 3rd switching tube connects the drain electrode of the 6th switching tube, while being also attached to second Intermediate node after electric capacity and the series connection of the 6th electric capacity；The drain electrode of 6th switching tube is also attached to one end of the 3rd inductance；3rd electricity The Same Name of Ends of 3rd primary side winding of another termination transformer of sense；The different name end of 3rd primary side winding of the transformer Connect one end of the 7th electric capacity；The source electrode of the switching tube of another termination the 6th of 7th electric capacity, while being also attached to the 5th switch The drain electrode of pipe.

The utility model also provides a kind of asymmetrical half-bridge circuit of reversed excitation, including flyback transformer, the first diode, First inductance, the second inductance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, first switch pipe, Two switching tubes, the 3rd switching tube, the 4th switching tube, described transformer include the first primary side winding, the second primary side winding, first Vice-side winding.Its annexation is：The first described electric capacity and described the second electric capacity series connection, the two-terminal one after series connection are terminated The positive pole of input voltage, while the drain electrode of described first switch pipe, the negative pole of another termination input voltage are connect, while connecing described The 4th switching tube source electrode；The source electrode of described first switch pipe connects the drain electrode of described second switch pipe；Described first The source electrode of switching tube is also attached to one end of the first described inductance simultaneously；Another termination transformation of the first described inductance The Same Name of Ends of first primary side winding of device；The different name of first primary side winding of the transformer terminates the one of the 3rd described electric capacity End；The source electrode of another termination second switch pipe of the 3rd described electric capacity, at the same be also attached to described the first electric capacity and Intermediate node after the series connection of second electric capacity, while being also attached to the drain electrode of the 3rd described switching tube；The 3rd described switching tube Source electrode connect the drain electrode of the 4th described switching tube；The source electrode of the 3rd described switching tube is also attached to the second described electricity simultaneously One end of sense；The Same Name of Ends of second primary side winding of another termination transformer of the second described inductance；The transformer The second primary side winding described the 4th electric capacity of different name termination one end；Another termination the described 4th of the 4th described electric capacity The source electrode of switching tube；The other end of 4th electric capacity is also connected with input negative terminal；The different name of first vice-side winding of the transformer The anode of the first described diode of termination；The negative electrode of the first described diode connects one end of the 5th described electric capacity, simultaneously It is used as output cathode；The Same Name of Ends of first vice-side winding of another termination transformer of the 5th described electric capacity, makees simultaneously For output negative pole.

Described first switch pipe, the 3rd described switching tube are main switch, and drive signal is synchronous；Described second Switching tube, the 4th described switching tube are clamping switch tube, and drive signal is synchronous；Main switch drives with clamping switch tube to be believed Number there is a dead time between complementation, and two drive signals.

It is used as the equivalent technical solutions of primitive technology scheme, a kind of asymmetrical half-bridge circuit of reversed excitation, it is characterised in that：Including One flyback transformer, the first diode, the first inductance, the second inductance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electricity Appearance, the 5th electric capacity, first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, described transformer include first Primary side winding, the second primary side winding, the first vice-side winding.Its annexation is：The first described electric capacity and the second described electricity Hold series connection, the two-terminal one after series connection terminates the positive pole of input voltage, while connecing the drain electrode of described second switch pipe, the other end The negative pole of input voltage is connect, while connecing the source electrode of the 3rd described switching tube；Described second switch drain electrode also connects described the One end of one inductance；The Same Name of Ends of first primary side winding of another termination transformer of the first described inductance；It is described to become One end of the 3rd electric capacity described in the different name termination of first primary side winding of depressor；Described in another termination of the 3rd described electric capacity Second switch pipe source electrode, while being also attached to the drain electrode of described first switch pipe；The source electrode of described first switch pipe The drain electrode of the 4th described switching tube is connect, while being also attached to the middle node after the first described electric capacity and the series connection of the second electric capacity Point；The drain electrode of the 4th described switching tube is also attached to one end of the second described inductance；The other end of the second described inductance Connect the Same Name of Ends of the second primary side winding of the transformer；The different name termination of second primary side winding of the transformer it is described the One end of four electric capacity；The source electrode of the 4th switching tube described in another termination of the 4th described electric capacity, while being also attached to described The drain electrode of 3rd switching tube；The anode of the first diode described in the different name termination of first vice-side winding of the transformer；Institute The negative electrode for the first diode stated connects one end of the 5th described electric capacity, while being used as output cathode；The 5th described electric capacity The Same Name of Ends of first vice-side winding of another termination transformer, while being used as output negative pole.

It is preferred that, described switching tube is N-MOS pipes.

It is preferred that, the first described inductance can be the leakage inductance of the first primary side winding of the transformer.

It is preferred that, the second described inductance can be the leakage inductance of the second primary side winding of the transformer.

It is preferred that, described the first inductance and the second inductance can also be independent inductance element.

It is preferred that, the intermediate node after the first described electric capacity and the series connection of the second electric capacity, to the source of the first switch pipe A resistance is connected between pole.

As the improvement of primitive technology scheme, on its basis, described transformer increases the 3rd primary side winding, together When circuit also increase the 6th electric capacity, the 7th electric capacity, the 5th switching tube, the 6th switching tube, the 3rd inductance；Circuit connection after improvement Relation is：The 6th described electric capacity is connected with the first described electric capacity and the second described electric capacity, two-terminal one end after series connection The positive pole of input voltage is connect, while connecing the drain electrode of described first switch pipe, the negative pole of another termination input voltage, while meeting institute The source electrode for the 6th switching tube stated；The source electrode of described first switch pipe connects the drain electrode of described second switch pipe；Described The source electrode of one switching tube is also attached to one end of the first described inductance simultaneously；Another termination of the first described inductance is described to be become The Same Name of Ends of first primary side winding of depressor；The different name of first primary side winding of the transformer terminates the 3rd described electric capacity One end；The source electrode of another termination second switch pipe of the 3rd described electric capacity, while being also attached to the first described electric capacity Intermediate node after being connected with the second electric capacity, while being also attached to the drain electrode of the 3rd described switching tube；The 3rd described switch The source electrode of pipe connects the drain electrode of the 4th described switching tube；The source electrode of the 3rd described switching tube is also attached to described second simultaneously One end of inductance；The Same Name of Ends of second primary side winding of another termination transformer of the second described inductance；The transformation One end of the 4th electric capacity described in the different name termination of second primary side winding of device；Another termination described of the 4th described electric capacity The source electrode of four switching tubes, while the intermediate node after the second described electric capacity and the series connection of the 6th electric capacity is also attached to, while also connecting It is connected to the drain electrode of the 5th described switching tube；The source electrode of the 5th described switching tube connects the drain electrode of the 6th described switching tube；Institute The source electrode for the 5th switching tube stated is while be also attached to one end of the 3rd described inductance；Another termination of the 3rd described inductance The Same Name of Ends of 3rd primary side winding of the transformer；The 7th described in the different name termination of 3rd primary side winding of the transformer One end of electric capacity；The source electrode of another termination the 6th switching tube of the 7th described electric capacity；First secondary of the transformer The anode of the first diode described in the different name termination of winding；The negative electrode of the first described diode connects the 5th described electric capacity One end, while being used as output cathode；First vice-side winding of another termination transformer of the 5th described electric capacity it is of the same name End, while being used as output negative pole；

Described first switch pipe, the 3rd described switching tube, the 5th described switching tube are main switch, and driving letter Number synchronization；Described second switch pipe, the 4th described switching tube, the 6th described switching tube are clamping switch tube, and driving Signal is synchronous；Main switch is complementary with clamping switch tube drive signal, and has a dead time between two drive signals.

As the improvement of equivalent technical solutions, on its basis, described transformer increases the 3rd primary side winding, together When circuit also increase the 6th electric capacity, the 7th electric capacity, the 5th switching tube, the 6th switching tube, the 3rd inductance；Circuit connection after improvement Relation is：The 6th described electric capacity is connected with the first described electric capacity and the second described electric capacity, two-terminal one end after series connection The positive pole of input voltage is connect, while connecing the drain electrode of described second switch pipe, the negative pole of another termination input voltage, while meeting institute The source electrode for the 5th switching tube stated；Described second switch drain electrode also connects one end of the first described inductance；The first described electricity The Same Name of Ends of first primary side winding of another termination transformer of sense；The different name end of first primary side winding of the transformer Connect one end of the 3rd described electric capacity；The source electrode of second switch pipe described in another termination of the 3rd described electric capacity, also simultaneously It is connected to the drain electrode of described first switch pipe；The source electrode of described first switch pipe connects the drain electrode of the 4th described switching tube, The intermediate node after the first described electric capacity and the series connection of the second electric capacity is also attached to simultaneously；The drain electrode of the 4th described switching tube is also It is connected to one end of the second described inductance；Second primary side winding of another termination transformer of the second described inductance Same Name of Ends；One end of the 4th electric capacity described in the different name termination of second primary side winding of the transformer；The 4th described electric capacity Another termination described in the 4th switching tube source electrode, while being also attached to the drain electrode of the 3rd switching tube；Described the 3rd The source electrode of switching tube connects the drain electrode of the 6th described switching tube, while the second electric capacity and the series connection of the 6th electric capacity described in being also attached to Intermediate node afterwards；The drain electrode of the 6th described switching tube is also attached to one end of the 3rd described inductance；The 3rd described electricity The Same Name of Ends of 3rd primary side winding of another termination transformer of sense；The different name end of 3rd primary side winding of the transformer Connect one end of the 7th described electric capacity；The source electrode of the 6th switching tube described in another termination of the 7th described electric capacity, also simultaneously It is connected to the drain electrode of the 5th switching tube；The first diode described in the different name termination of first vice-side winding of the transformer Anode；The negative electrode of the first described diode connects one end of the 5th described electric capacity, while being used as output cathode；Described The Same Name of Ends of first vice-side winding of another termination transformer of five electric capacity, while being used as output negative pole；

It is preferred that, described switching tube is N-MOS pipes.

It is preferred that, the 3rd described inductance can be the leakage inductance of the 3rd primary side winding of the transformer.

It is preferred that, described the first inductance, the second inductance, the 3rd inductance can also be independent inductance elements.

It is preferred that, the intermediate node after the second described electric capacity and the series connection of the 6th electric capacity, to the source of the 3rd switching tube A resistance is connected between pole.

The operation principle of the utility model primitive technology scheme can be described in detail in embodiment, be sketched here,

During stable state, described first switch pipe and the 3rd switching tube are simultaneously open-minded.Input voltage is applied to the first inductance, In one primary side winding, the 3rd electric capacity, the second inductance, the second primary side winding, the series loop of the 4th electric capacity, occurs resonance.Due to First primary side winding and the second primary side winding sensibility reciprocal are larger, and resonant frequency is less than switching frequency, so exciting current approximately linear Increase, the first described primary side winding and the second primary side energy storage.Now described second switch pipe and the 4th switching tube two ends electricity Press as 1/2nd of input voltage.

When described first switch pipe and the 3rd switching tube end, described second switch pipe and the 4th switching tube also Do not open, time period is dead time.Because the first described inductance, the second inductance, the first original in this section of dead time Side winding and the second primary side winding want afterflow, described first switch pipe, the 3rd switching tube, second switch pipe, the 4th switching tube Junction capacity, the first inductance, the first primary side winding, the 3rd electric capacity, the second inductance, the second primary side winding, the 4th electric capacity occur it is humorous Shake, the energy of the described second switch pipe of extraction and the 4th switch junction capacitance, second switch pipe and the 4th switching tube two ends are electric Drops.Simultaneously to described first switch pipe and the 3rd switch junction capacitance charging, first switch pipe and the 3rd switching tube two Terminal voltage rises.When the junction capacity voltage of the first switch pipe and the 3rd switching tube reaches highest, the second switch pipe and When the junction capacity voltage of 4th switching tube is pumped to zero, driving letter is applied in described second switch pipe and the 4th switch tube grid Number, so it is achieved that the no-voltage of clamping switch tube is open-minded, no-voltage opens English and is abbreviated as ZVS.Now described first Diode forward is turned on, and the primary side winding of transformer first and the second primary side winding are by reflected voltage clamper, while to the first secondary Winding releases energy, exciting current linear decline, to zero after negative sense it is linearly increasing.Meanwhile, the first described inductance and the 3rd electricity Hold the trail change that the electric current occurred in resonance, the first described primary side winding presses sine wave；The second described inductance and the 4th Resonance occurs for electric capacity；Electric current in the second described primary side winding presses the trail change of sine wave.Now described first switch Pipe and the 3rd switching tube both end voltage are 1/2nd of input voltage.

When described second switch pipe and the 4th switching tube end, described first switch pipe and the 3rd switching tube also Do not open, time period is dead time.In this section of dead time, because described the first inductance and the second inductance will continue Stream, described first switch pipe, the 3rd switching tube, second switch pipe, the junction capacity of the 4th switching tube, the first inductance, the 3rd electricity The energy of resonance, the described first switch pipe of extraction and the 3rd switch junction capacitance occurs for appearance, the second inductance, the 4th electric capacity, the One switching tube and the 3rd switching tube both end voltage decline.Filled simultaneously to described second switch pipe and the 4th switch junction capacitance Electricity, second switch pipe and the 4th switching tube both end voltage rise.When the junction capacity electricity of the second switch pipe and the 4th switching tube Pressure reaches highest, when the junction capacity voltage of the first switch pipe and the 3rd switching tube is pumped to zero, in described first switch Pipe and the 3rd switch tube grid apply drive signal, are so achieved that the ZVS of main switch.A cycle is thus completed, Then continue to according to same process repeated work.

, clamping switch tube turn off phase open-minded in main switch, the first inductance, are can be seen that from above-mentioned operation principle One primary side winding, the 3rd electric capacity, the second inductance, the second primary side winding, the 4th electric capacity constitute a series resonant tank, occur humorous Shake, while to transformer primary side winding energy storage, to realize that the ZVS of clamping switch tube provides condition.And end in main switch, Clamping switch tube is opened the stage, and the first inductance and the 3rd electric capacity constitute an independent resonant tank, the second inductance and the 4th electricity Hold composition another independent resonant tank, i.e., two independent resonant tank parallel connection to release energy for load, while to realize Main switch ZVS in respective resonant tank provides condition.

Compared with prior art, the utility model has the advantages that：

1st, all switching tubes can realize ZVS, improve overall efficiency.

2nd, in the course of work, voltage when switching tube ends is the half of input voltage, and transformer leakage inductance participates in humorous Shake, switching tube does not have peak voltage stress, be easy to use common switching tube, reduce cost.

Brief description of the drawings

Fig. 1 is existing wide scope, the circuit of reversed excitation figure of high input voltage Switching Power Supply use；

Fig. 2 is existing wide scope, the forward converter figure of high input voltage Switching Power Supply use；

Fig. 3-1 is the schematic diagram of the utility model first embodiment asymmetrical half-bridge circuit of reversed excitation；

Fig. 3-2 is the schematic diagram of the utility model first embodiment asymmetrical half-bridge circuit of reversed excitation, wherein being labeled with resonance Loop, is main switch Q1, Q3 open-minded, resonant tank when clamping switch tube Q2, Q4 end shown in dotted line；It is shown in solid to be It is open-minded for clamping switch tube Q2, Q4, when main switch Q1, Q3 end, two independent resonant tanks；

Fig. 4 is the utility model first embodiment asymmetrical half-bridge circuit of reversed excitation working waveform figure；

Fig. 5 is the schematic diagram of the utility model second embodiment asymmetrical half-bridge circuit of reversed excitation；

Fig. 6 is the schematic diagram of the utility model 3rd embodiment asymmetrical half-bridge circuit of reversed excitation；

Fig. 7 is the schematic diagram of the utility model fourth embodiment asymmetrical half-bridge circuit of reversed excitation；

Fig. 8 is the schematic diagram of the embodiment asymmetrical half-bridge circuit of reversed excitation of the utility model the 5th.

Embodiment

First embodiment

Fig. 3-1 shows the circuit diagram of the utility model first embodiment asymmetrical half-bridge circuit of reversed excitation, a kind of asymmetric Half bridge flyback circuit, including electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, N-MOS pipe Q1, N-MOS pipe Q2, N-MOS Pipe Q3, N-MOS pipe Q4, output commutation diode D1.Flyback transformer T1 includes：First primary side winding Lp1, the second primary side winding Lp2, the first vice-side winding Ls1, the first inductance are Lp1 leakage inductance Lk1, and the second inductance is Lp2 leakage inductance Lk2.In practical application, Inductance Lp1, Lp2 can also be external independent inductance elements.Its specific annexation is：Electric capacity C1 and electric capacity C2 series connection, string Two-terminal one after connection terminates the positive pole of input voltage, while connecing N-MOS pipes Q1 drain electrode；Two after electric capacity C1 and electric capacity C2 series connection The negative pole of another termination input voltage of terminal, while connecing N-MOS pipes Q4 source electrode；Described N-MOS pipe Q1 source electrodes meet N-MOS Pipe Q2 drain electrode, while being also attached to inductance Lk1 one end；Inductance Lk1 another termination primary side winding Lp1 Same Name of Ends；It is former Side winding Lp1 different name termination capacitor C3 one end；Electric capacity C3 another termination N-MOS pipes Q2 source electrode, is also connected with simultaneously Intermediate node after electric capacity C1 and electric capacity C2 series connection, while being also attached to N-MOS pipes Q3 drain electrode；N-MOS pipes Q3 source electrode Connect institute N-MOS pipes Q4 drain electrode；N-MOS pipe Q3 source electrodes are also attached to inductance Lk2 one end simultaneously；Inductance Lk2 another termination Primary side winding Lp2 Same Name of Ends；Primary side winding Lp2 different name termination capacitor C4 one end；Electric capacity C4 another termination N-MOS pipes Q4 source electrode；Described vice-side winding Ls1 different name terminating diode D1 anode；Diode D1 negative electrode meets the one of electric capacity C5 End, while being used as output cathode；Electric capacity C5 another termination vice-side winding Ls1 Same Name of Ends, while being used as output negative pole.

The present embodiment operation principle is as follows：

Waveform during steady operation as shown in figure 4, N-MOS pipe Q1 and N-MOS pipes Q3 is main switch, N-MOS pipes Q2 and N-MOS pipes Q4 is clamping switch tube.Vgs1, Vgs2, Vgs3 and Vgs4 are N-MOS pipe Q1, N-MOS pipe Q2, N-MOS pipes Q3 respectively With N-MOS pipes Q4 drive signal waveform；Vds1, Vds2, Vds3 and Vds4 are N-MOS pipe Q1, N-MOS pipes Q2, N-MOS respectively Pipe Q3 and N-MOS pipe Q4 leakage, source voltage waveform；Ir1 is the resonance current waveform for flowing through inductance Lk1；Ir2 is to flow through inductance Lk2 resonance current waveform；Im1 is the excitation current waveform for flowing through primary side winding Lp1；Im2 is to flow through encouraging for primary side winding Lp2 Magnetic current waveform；Id1 is the current waveform for flowing through vice-side winding Ls1.If the drive signal dutycycle of main switch is D, then clamp The dutycycle of bit switch pipe is (1-D), to avoid supervisor and clamper tube common, it is necessary to leave certain dead time, work week Phase is T.

Within t0~t1 stages, drive signal Vgs1 and drive signal Vgs3 are high level, drive signal Vgs2 and driving Signal Vgs4 is low level, and main switch is open-minded, clamping switch tube cut-off.Input voltage is applied to by inductance Lk1, primary side winding In Lp1, electric capacity C3, inductance Lk2, primary side winding Lp2, the series loop of electric capacity C4 compositions, occurs resonance.Such as dotted line in Fig. 3-2 Shown is main switch Q1, Q3 open-minded, resonant tank when clamping switch tube Q2, Q4 end.Due to primary side winding Lp1 and original Side winding Lp2 inductance values are larger, and resonant frequency is less than switching frequency, so the increase of exciting current Im approximately linears, primary side winding Lp1 and primary side winding Lp2 energy storage.Exciting current Im1 is equal with resonance current Ir1, exciting current Im2 and resonance current Ir2 phases Deng the D1 cut-offs of output commutation diode.Now N-MOS pipes Q2 and N-MOS pipes Q4 both end voltages are respectively two points of input voltage One of.

At the t1 moment, drive signal Vgs1 and drive signal Vgs3 are changed into low level, while drive signal Vgs2 and driving Signal Vgs4 is still low level, and main switch and clamping switch tube all end.In the dead time in t1~t2 stages, because electric Inducing current can not be mutated, and inductance Lk1, primary side winding Lp1, inductance Lk2 and primary side winding Lp2 need afterflow, thus main switch and Clamping switch tube leakage, the junction capacity of source electrode, inductance Lk1, primary side winding Lp1, electric capacity C3, inductance Lk2, primary side winding Lp2, electric capacity Resonance occurs for C4, extracts N-MOS pipe Q2 and N-MOS pipes Q4 leakages, the energy of source junction capacitance, N-MOS pipe Q2 and N-MOS pipes Q4 two Terminal voltage declines.Leaked simultaneously to N-MOS pipe Q1 and N-MOS pipes Q3, the junction capacity of source electrode charges, N-MOS pipe Q1 and N-MOS pipes Q3 Both end voltage rises.When N-MOS pipe Q1 and N-MOS pipes Q3 leakages, source junction capacitance voltage reach highest, N-MOS pipes Q2 and N-MOS After pipe Q4 leakages, source junction capacitance voltage are pumped to zero, at the t2 moment, drive signal Vgs2 and drive signal Vgs4 are changed into high electricity It is flat.So, because N-MOS pipe Q2 and N-MOS pipes Q4 leakage, source voltage have dropped down to before drive signal is changed into high level Zero, therefore need to only be not required to increase other circuits, so that it may realize N-MOS pipe Q2 and N-MOS pipes Q4 by the design of resonant tank parameter Deng the ZVS of clamping switch tube.In this stage, exciting current Im1 is equal with resonance current Ir1, exciting current Im2 and resonance current Ir2 is equal, the D1 cut-offs of output commutation diode.Exciting current Im1 and exciting current Im2 due to primary side winding Lp1 and primary side around The voltage reduction at group Lp2 two ends, so while still amplitude is very small in increase.

At t2 moment, clamping switch tube conducting, inductance Lk1, primary side winding Lp1, electric capacity C3, N-MOS pipe Q2 constitute one Independent resonant tank, electric capacity C3 both end voltages Vc is applied directly on inductance Lk1 and primary side winding Lp1；Inductance Lk2, primary side around Group Lp2, electric capacity C4, N-MOS pipe Q4 constitute another independent resonant tank, and electric capacity C4 both end voltages Vc is applied directly to inductance On Lk2 and primary side winding Lp2.It is clamping switch tube Q2, Q4 open-minded, main switch Q1, Q3 cut-off as shown in solid in Fig. 3-2 When, two independent resonant tanks.Secondary side diode forward conduction.In t2~t3 stages, primary side winding Lp1 and primary side winding Lp2 is output reflected voltage clamper degaussing, is released energy to secondary, exciting current Im1 and exciting current Im2 linear declines, arrives Negative sense is linearly increasing after zero.Meanwhile, resonance occurs for inductance Lk1 and electric capacity C3, and resonance current Ir1 presses the trail change of sine wave； Resonance occurs for inductance Lk2 and electric capacity C4, and resonance current Ir2 presses the trail change of sine wave.Exciting current Im1 and resonance current Ir1 difference is multiplied by primary side winding Lp1 and vice-side winding Ls1 turn ratio N1, adds exciting current Im2 and resonance current Ir2's Difference is multiplied by primary side winding Lp2 and vice-side winding Ls1 turn ratio N2, equal to the electric current for flowing through vice-side winding Ls1, i.e.,

N₁(I_m1-I_r1)+N₂(I_m2-I_r2)=I_d1

Within t2~t3 stages, N-MOS pipe Q1 and N-MOS pipe Q3 both end voltages are 1/2nd of input voltage.

At the t3 moment, drive signal Vgs2 and drive signal Vgs4 are changed into low level, while drive signal Vgs1 and driving Signal Vgs3 is still low level, and main switch and clamping switch tube all end.In the dead time in t3~t4 stages, because electric Inducing current can not be mutated, and inductance Lk1 and inductance Lk2 need afterflow, therefore the junction capacity of main switch and clamping switch tube, inductance Resonance occurs for Lk1, electric capacity C3, inductance Lk2, electric capacity C4, extracts the energy of N-MOS pipe Q1 and N-MOS pipe Q3 junction capacity, N-MOS Pipe Q1 and N-MOS pipe Q3 both end voltages decline.Leaked simultaneously to N-MOS pipe Q2 and N-MOS pipes Q4, the junction capacity of source electrode charges, N- Metal-oxide-semiconductor Q2 and N-MOS pipe Q4 both end voltages rise.When N-MOS pipe Q2 and N-MOS pipe Q4 junction capacity voltages reach highest, N-MOS After pipe Q1 and N-MOS pipe Q3 junction capacity voltages are pumped to zero, at the t4 moment, drive signal Vgs1 and drive signal Vgs3 are changed into high Level.So, because N-MOS pipe Q1 and N-MOS pipes Q3 leakage, source voltage have dropped down to before drive signal is changed into high level Zero, therefore need to only be not required to increase other circuits, so that it may realize N-MOS pipe Q1 and N-MOS pipes Q3 by the design of resonant tank parameter Deng the ZVS of main switch.Now exciting current Im1 is equal with resonance current Ir1, exciting current Im2 and resonance current Ir2 phases Deng the D1 cut-offs of output commutation diode.A cycle is thus completed, is then continued to according to same process repeated work.

Advantage of the present utility model is apparent：

1st, from circuit in itself from the point of view of, it can realize Sofe Switch, efficiency high.

2nd, from the point of view of switching tube type selecting, in the course of work, voltage when switching tube ends is the half of input voltage, and Transformer leakage inductance participates in resonance, and switching tube does not have peak voltage stress, is easy to use common switching tube.

3rd, from transformer winding technique, its leakage inductance is utilized participation resonance, it is not necessary to which special winding method comes Reduce leakage inductance, be advantageously implemented the automation machine winding technologe of transformer.

Now respectively with scheme shown in Fig. 1 and technical solutions of the utility model design 200W Switching Power Supplies, input voltage range For 250VDC~900VDC, 24V/8.3A is exported, the indexs such as the efficiency of two schemes, switch tube voltage stress are contrasted, Further illustrate.

Scheme shown in the Fig. 1 of table 1 and technical solutions of the utility model full load efficiency contrast test result

Input voltage	Scheme shown in Fig. 1	Technical solutions of the utility model
			250VDC	87%	91%
600VDC	90%	92%
			900VDC	89%	91%

In terms of the test data of table 1, technical solutions of the utility model efficiency is better than scheme shown in traditional Fig. 1, particularly low During pressure input, input current is big, due to the Sofe Switch function of the technical program and the low pressure-resistant N-MOS pipes of selection, is greatly reduced The loss of switching tube, has been obviously improved the efficiency of power supply.

Scheme shown in the Fig. 1 of table 2 and technical solutions of the utility model switch tube voltage stress contrast test result

N-MOS	Scheme shown in Fig. 1	Technical solutions of the utility model
			Q1	692V	450V
Q2	692V	450V
			Q3	----	450V
Q4	----	450V

In terms of the test data of table 2, four N-MOS tube voltage stress in technical solutions of the utility model are input voltage Half, can select the pressure-resistant pipes of conventional 600V.And the N-MOS tube voltage stress in scheme shown in traditional Fig. 1 is equal to The half of input voltage, adds output reflection voltage, along with the due to voltage spikes that leakage inductance is produced, much larger than the art of this patent scheme In N-MOS tube voltage stress, it is considered to stay certain voltage surplus, and be hard switching, it is necessary to select pressure-resistant more than 800V, junction capacity It is small, the small N-MOS pipes of conduction impedance.And the N-MOS pipes of this specification price that is higher by 1~2 times more pressure-resistant than conventional 600V.

Second embodiment

Fig. 5 be the utility model the second example asymmetrical half-bridge circuit of reversed excitation circuit diagram, it is different from first embodiment it It is in the change in location of main switch and clamping switch tube.Its specific annexation is：Described electric capacity C1 and electric capacity C2 strings Connection, the two-terminal one after series connection terminates the positive pole of input voltage, while connecing described N-MOS pipes Q2 drain electrode, another termination is defeated Enter the negative pole of voltage, while connecing described N-MOS pipes Q3 source electrode；N-MOS pipes Q2 drain electrode also meets the one of described inductance Lk1 End；The primary side winding Lp1 of inductance Lk1 another termination transformer Same Name of Ends；Primary side winding Lp1 different name termination is described Electric capacity C3 one end；The source electrode of N-MOS pipes Q2 described in electric capacity C3 another termination, while being also attached to described N-MOS Pipe Q1 drain electrode；N-MOS pipes Q1 source electrode connects described N-MOS pipes Q4 drain electrode, at the same be also attached to described electric capacity C1 and Intermediate node after electric capacity C2 series connection；Described N-MOS pipes Q4 drain electrode is also attached to described inductance Lk2 one end；Inductance The primary side winding Lp2 of Lk2 another termination transformer Same Name of Ends；Electric capacity described in primary side winding Lp2 different name termination C4 one end；The source electrode of N-MOS pipes Q4 described in electric capacity C4 another termination, while being also attached to described N-MOS pipes Q3's Drain electrode；Described vice-side winding Ls1 different name terminating diode D1 anode；Diode D1 negative electrode connects electric capacity C5 one end, It is used as output cathode simultaneously；Electric capacity C5 another termination vice-side winding Ls1 Same Name of Ends, while being used as output negative pole；

Described N-MOS pipe Q1, N-MOS pipes Q3 is main switch, and drive signal is synchronous；Described N-MOS pipes Q2, N- Metal-oxide-semiconductor Q4 is clamping switch tube, and drive signal is synchronous；Main switch is complementary with clamping switch tube drive signal, and two drives There is a dead time between dynamic signal.The present embodiment can equally realize the ZVS of N-MOS pipes, and during each N-MOS pipes cut-off Leakage, the voltage of source electrode are 1/2nd of input voltage.

3rd embodiment

Fig. 6 is the circuit diagram of the 3rd example, is with first embodiment difference, and described transformer increase the 3rd is former Side winding Lp3, electric capacity C6, electric capacity C7, N-MOS pipe Q5, N-MOS pipe Q6, primary side winding Lp3 leakage inductance Lk3.In practical application, Inductance Lp3 can also be external independent inductance element.On the basis of first embodiment, the annexation of newly-increased element is： Described electric capacity C6 connects with described electric capacity C1 and electric capacity C2, and the two-terminal one after series connection terminates the positive pole of input voltage, separately The negative pole of one termination input voltage, while connecing described N-MOS pipes Q6 source electrode；After described electric capacity C2 and electric capacity C6 series connection Intermediate node connects described N-MOS pipes Q4 source electrode, while being also attached to described N-MOS pipes Q5 drain electrode；Described N-MOS Pipe Q5 source electrode connects described N-MOS pipes Q6 drain electrode, while being also attached to described inductance Lk3 one end；Described inductance Lk3 another termination transformer primary side winding Lp3 Same Name of Ends；The different name termination institute of the transformer primary side winding Lp3 The electric capacity C7 stated one end；The source electrode of N-MOS pipes Q6 described in described electric capacity C7 another termination；

Described N-MOS pipe Q1, N-MOS pipe Q3, N-MOS pipes Q5 is main switch, and drive signal is synchronous；Described N- Metal-oxide-semiconductor Q2, N-MOS pipe Q4, N-MOS pipe Q6 is clamping switch tube, and drive signal is synchronous；Main switch drives with clamping switch tube Dynamic signal is complementary, and has a dead time between two drive signals.The present embodiment can equally realize the ZVS of N-MOS pipes, And leakage, the voltage of source electrode are 1/3rd of input voltage during each N-MOS pipes cut-off, it is suitable for that input voltage is higher to be opened On powered-down source.

Fourth embodiment

Fig. 7 is the circuit diagram of the 4th example, is with second embodiment difference, and transformer increases by the 3rd primary side winding Lp3, electric capacity C6, electric capacity C7, N-MOS pipe Q5, N-MOS pipe Q6, primary side winding Lp3 leakage inductance Lk3.In practical application, inductance Lp3 It can also be external independent inductance element.On the basis of second embodiment, the annexation of newly-increased element is：Described electricity Hold C6 to connect with described electric capacity C1 and electric capacity C2, the two-terminal one after series connection terminates the positive pole of input voltage, another termination is defeated Enter the negative pole of voltage, while connecing described N-MOS pipes Q5 source electrode；Intermediate node after described electric capacity C2 and electric capacity C6 series connection Described N-MOS pipes Q3 source electrode is connect, while being also attached to described N-MOS pipes Q6 drain electrode；N-MOS pipes Q6 drain electrode also connects It is connected to described inductance Lk3 one end；The primary side winding Lp3 of inductance Lk3 another termination transformer Same Name of Ends；Primary side One end of electric capacity C7 described in winding Lp3 different name termination；The source electrode of N-MOS pipes Q6 described in electric capacity C7 another termination, together When be also attached to described N-MOS pipes Q5 drain electrode.

5th embodiment

Fig. 8 be the 5th example circuit diagram, be with first embodiment difference, electric capacity C1 and electric capacity C2 series connection after Midpoint is further connected with resistance R1 between N-MOS pipes Q2 source electrode, and other annexations are constant.Resistance R1 effect is：Due to electricity Hold the series loop that C1, N-MOS pipe Q1, inductance Lk1, primary side winding Lp1, electric capacity C3 are constituted, with electric capacity C2, N-MOS pipe Q3, The impedance for the series loop that inductance Lk2, primary side winding Lp2, electric capacity C4 are constituted can not possibly be essentially equal (due to component parameters essence Degree deviation causes), the peak point current in two loops difference can be caused.The resistance value will be suitably larger than two impedance loops Difference, to weaken the influence that impedance is not completely equivalent, to greatest extent reduce two loop peak point currents difference.

Similarly, the resistor proposal that seals in of the 5th embodiment is also applied for 3rd embodiment, i.e., gone here and there in electric capacity C2 and electric capacity C6 Midpoint after connection is further connected with resistance R2 between N-MOS pipes Q6 source electrode, and other annexations are constant.Resistance R2 effect and electricity The effect for hindering R1 is essentially identical.

It the above is only preferred embodiment of the present utility model, it is noted that above-mentioned preferred embodiment should not be regarded To limitation of the present utility model, for those skilled in the art, not depart from essence of the present utility model In god and scope, some improvements and modifications can also be made, such as output commutation diode D1 changes metal-oxide-semiconductor into, makees synchronous rectification；Become Depressor is further added by one or more primary side windings, N-MOS pipes, inductance, electric capacity；Transformer increases one or more vice-side windings, Become multiple-channel output etc.；These improvements and modifications also should be regarded as protection domain of the present utility model, and embodiment is no longer used here Repeat, protection domain of the present utility model should be defined by claim limited range.

Claims

1. a kind of asymmetrical half-bridge circuit of reversed excitation, including input positive terminal, input negative terminal, transformer, the primary side winding with transformer The primary circuit of connection and the secondary circuit being connected with the vice-side winding of transformer, primary circuit include the first electric capacity and the second electricity Hold, one end of the first electric capacity is connected with input positive terminal, and the other end of the first electric capacity is connected with one end of the second electric capacity, the second electric capacity The other end be connected with input negative terminal, it is characterised in that：

Primary circuit also includes：

Four switching tubes, i.e. first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube, the leakages of four switching tubes- Source electrode is sequentially connected in series between input positive terminal and input negative terminal, and wherein first switch pipe and the 3rd switching tube are main switch Pipe, and drive signal is synchronous；Second switch pipe and the 4th switching tube are clamping switch tube, and drive signal is synchronous；Main switch It is complementary with clamping switch tube drive signal, and have a dead time between two drive signals；

Two inductance, i.e. the first inductance and the second inductance；

The Same Name of Ends of first primary side winding of transformer is connected by the first inductance with the drain electrode of second switch pipe, the first primary side around The different name end of group is connected with the source electrode of second switch pipe and the other end of the first electric capacity respectively by the 3rd electric capacity；Second primary side around The Same Name of Ends of group is connected by the second inductance with the drain electrode of the 4th switching tube, and the different name end of the second primary side winding passes through the 4th electric capacity It is connected respectively with the source electrode of the 4th switching tube and the other end of the second electric capacity；

In main switch conducting, clamping switch tube shut-off, input voltage is applied to the first inductance, the first primary side winding, the 3rd In the series loop that electric capacity, the second inductance, the second primary side winding and the 4th electric capacity are sequentially constituted, resonance is produced；In main switch The first dead time all ended with clamping switch tube, the junction capacity of four switching tubes is concatenated loop and produces resonance, extracts pincers The energy of bit switch junction capacitance, to realize that the no-voltage of clamping switch tube is open-minded；

In main switch shut-off, clamping switch tube conducting, the first inductance, the first primary side winding, the 3rd electric capacity and second switch Pipe constitutes the first resonant tank；Second inductance, the second primary side winding, the 4th electric capacity and the 4th switching tube constitute the second resonance and returned Road；The second dead time all ended in main switch and clamping switch tube, the junction capacity of four switching tubes is concatenated loop production Raw resonance, extracts the energy of main switch junction capacity, to realize that the no-voltage of main switch is open-minded.

2. asymmetrical half-bridge circuit of reversed excitation according to claim 1, it is characterised in that：The transformer also has and second 3rd primary side winding of primary side winding series connection；The primary circuit also include the 6th electric capacity, the 5th switching tube, the 6th switching tube, 3rd inductance and the 7th electric capacity, one end of the 6th electric capacity are connected with the other end of the second electric capacity, the other end of the 6th electric capacity with it is defeated Enter negative terminal connection；5th switching tube and the 6th switching tube are sequentially connected in series in input positive terminal and input with four switching tubes Between negative terminal, wherein the 5th switching tube is main switch, the 6th switching tube is clamping switch tube；

The Same Name of Ends of the primary side winding of transformer the 3rd is connected by the 3rd inductance with the drain electrode of the 6th switching tube, the 3rd primary side winding Different name end be connected respectively with the source electrode of the 6th switching tube and the other end of the 6th electric capacity by the 7th electric capacity；

In main switch conducting, clamping switch tube shut-off, input voltage is applied to the first inductance, the first primary side winding, the 3rd In the series loop that electric capacity, the second primary side winding, the 4th electric capacity, the 3rd primary side winding and the 7th electric capacity are sequentially constituted, produce humorous Shake；The first dead time all ended in main switch and clamping switch tube, the junction capacity of six switching tubes is concatenated loop production Raw resonance, extracts the energy of clamp switch junction capacitance, to realize that the no-voltage of clamping switch tube is open-minded；

In main switch shut-off, clamping switch tube conducting, the first primary side winding, the 3rd electric capacity and second switch pipe composition first Resonant tank；Second primary side winding, the 4th electric capacity and the 4th switching tube constitute the second resonant tank；3rd primary side winding, the 7th Electric capacity and the 6th switching tube constitute the 3rd resonant tank；The second dead time all ended in main switch and clamping switch tube, The junction capacity of six switching tubes is concatenated loop and produces resonance, the energy of main switch junction capacity is extracted, to realize main switch The no-voltage of pipe is open-minded.

3. asymmetrical half-bridge circuit of reversed excitation according to claim 1, it is characterised in that：The primary circuit also includes first Resistance, first resistor is connected between the other end of the first electric capacity and the 3rd electric capacity.

4. asymmetrical half-bridge circuit of reversed excitation according to claim 2, it is characterised in that：The primary circuit also includes first Resistance and second resistance, first resistor are connected between the other end of the first electric capacity and the 3rd electric capacity；Second resistance is connected on Between the other end of two electric capacity and the 4th electric capacity.

5. the asymmetrical half-bridge circuit of reversed excitation according to any one of claim 1-4, it is characterised in that：The secondary electricity Road, including the first diode and the 5th electric capacity,

The different name end connection of the anode of first diode and the first vice-side winding of transformer, the negative electrode of the first diode and the 5th One end connection of electric capacity, output cathode is used as while drawing；The other end of 5th electric capacity and the Same Name of Ends of the first vice-side winding connect Connect, output negative pole is used as while drawing.

6. a kind of asymmetrical half-bridge circuit of reversed excitation, including transformer, it is characterised in that：

The transformer includes the first primary side winding, the second primary side winding and the first vice-side winding；

The asymmetrical half-bridge circuit of reversed excitation also includes the first diode, the first inductance, the second inductance, the first electric capacity, the second electricity Appearance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube, the One switching tube and the 3rd switching tube are main switch, and drive signal is synchronous；Second switch pipe and the 4th switching tube are opened for clamper Guan Guan, and drive signal is synchronous；Main switch is complementary with clamping switch tube drive signal, and has one between two drive signals Dead time, its annexation is：First electric capacity and the series connection of the second electric capacity, the termination input positive terminal of two-terminal one after series connection, together When connect the drain electrode of first switch pipe, another termination input negative terminal, while connecing the source electrode of the 4th switching tube；The source electrode of first switch pipe Connect the drain electrode of second switch pipe；The source electrode of first switch pipe is also attached to one end of the first inductance simultaneously, the first inductance it is another Terminate the Same Name of Ends of the first primary side winding；The different name of first primary side winding terminates one end of the 3rd electric capacity；3rd electric capacity it is another The source electrode of second switch pipe is terminated, while the intermediate node after the first electric capacity and the series connection of the second electric capacity is also attached to, while also connecting It is connected to the drain electrode of the 3rd switching tube；The source electrode of 3rd switching tube connects the drain electrode of the 4th switching tube；The source electrode of 3rd switching tube is simultaneously It is also attached to one end of the second inductance；The Same Name of Ends of second primary side winding of another termination transformer of the second inductance；Transformer The second primary side winding different name terminate the 4th electric capacity one end；The source electrode of the switching tube of another termination the 4th of 4th electric capacity；The The other end of four electric capacity is also connected with input negative terminal.

7. asymmetrical half-bridge circuit of reversed excitation according to claim 6, it is characterised in that：The transformer also has and second 3rd primary side winding of primary side winding series connection；The primary circuit also include the 6th electric capacity, the 5th switching tube, the 6th switching tube, 3rd inductance and the 7th electric capacity, wherein the 5th switching tube is main switch, the 6th switching tube is clamping switch tube, its annexation For：6th electric capacity is connected with the first electric capacity and the second electric capacity, and the two-terminal one after series connection terminates the positive pole of input voltage, connects simultaneously The drain electrode of first switch pipe, the negative pole of another termination input voltage, while connecing the source electrode of the 6th switching tube；4th electric capacity it is another The source electrode of the 4th switching tube is terminated, while the intermediate node after the second electric capacity and the series connection of the 6th electric capacity is also attached to, while also connecting It is connected to the drain electrode of the 5th switching tube；The source electrode of 5th switching tube connects the drain electrode of the 6th switching tube；The source electrode of 5th switching tube is simultaneously It is also attached to one end of the 3rd inductance；The Same Name of Ends of 3rd primary side winding of another termination transformer of the 3rd inductance；Transformer The 3rd primary side winding different name terminate the 7th electric capacity one end；The source electrode of the switching tube of another termination the 6th of 7th electric capacity.

8. asymmetrical half-bridge circuit of reversed excitation according to claim 6, it is characterised in that：The primary circuit also includes first Resistance, first resistor is connected between the intermediate node after the other end of the 3rd electric capacity is connected with the first electric capacity and the second electric capacity.

9. asymmetrical half-bridge circuit of reversed excitation according to claim 7, it is characterised in that：The primary circuit also includes first Resistance and second resistance, first resistor are connected on the centre after the other end of the 3rd electric capacity is connected with the first electric capacity and the second electric capacity Between node；Second resistance is connected on the intermediate node after another termination of the 4th electric capacity is connected with the second electric capacity and the 6th electric capacity Between.

10. the asymmetrical half-bridge circuit of reversed excitation according to any one of claim 6-9, it is characterised in that：The secondary electricity The different name end of road, including the first diode and the 5th electric capacity, the anode of the first diode and the first vice-side winding of transformer connects Connect, the negative electrode of the first diode is connected with one end of the 5th electric capacity, output cathode is used as while drawing；The other end of 5th electric capacity It is connected with the Same Name of Ends of the first vice-side winding, output negative pole is used as while drawing.

11. a kind of asymmetrical half-bridge circuit of reversed excitation, including transformer, it is characterised in that：

The asymmetrical half-bridge circuit of reversed excitation also includes the first diode, the first inductance, the second inductance, the first electric capacity, the second electricity Appearance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube, the One switching tube and the 3rd switching tube are main switch, and drive signal is synchronous；Second switch pipe and the 4th switching tube are opened for clamper Guan Guan, and drive signal is synchronous；Main switch is complementary with clamping switch tube drive signal, and has one between two drive signals Dead time, its annexation is：First electric capacity and the series connection of the second electric capacity, the termination of two-terminal one input voltage after series connection is just Pole, while the drain electrode of second switch pipe is connect, the negative pole of another termination input voltage, while connecing the source electrode of the 3rd switching tube；Second Switch drain also connects one end of the first inductance；The Same Name of Ends of first primary side winding of another termination transformer of the first inductance；Become The different name of first primary side winding of depressor terminates one end of the 3rd electric capacity；The source of another termination second switch pipe of 3rd electric capacity Pole, while being also attached to the drain electrode of first switch pipe；The source electrode of first switch pipe connects the drain electrode of the 4th switching tube, is also connected with simultaneously Intermediate node after the first electric capacity and the series connection of the second electric capacity；The drain electrode of 4th switching tube is also attached to one end of the second inductance； The Same Name of Ends of second primary side winding of another termination transformer of the second inductance；The different name termination of second primary side winding of transformer One end of 4th electric capacity；The source electrode of the switching tube of another termination the 4th of 4th electric capacity, while being also attached to the leakage of the 3rd switching tube Pole.

12. asymmetrical half-bridge circuit of reversed excitation according to claim 11, it is characterised in that：The transformer also has and the 3rd primary side winding of two primary side windings series connection；The primary circuit also includes the 6th electric capacity, the 5th switching tube, the 6th switch Pipe, the 3rd inductance and the 7th electric capacity, wherein the 5th switching tube is main switch, the 6th switching tube is clamping switch tube, and it is connected Relation is：6th electric capacity is connected with the first electric capacity and the second electric capacity, and the two-terminal one after series connection terminates the positive pole of input voltage, together When connect the drain electrode of second switch pipe, the negative pole of another termination input voltage, while connecing the source electrode of the 5th switching tube；3rd switching tube Source electrode connect the drain electrode of the 6th switching tube, while be also attached to the second electric capacity and the 6th electric capacity series connection after intermediate node；6th The drain electrode of switching tube is also attached to one end of the 3rd inductance；3rd primary side winding of another termination transformer of the 3rd inductance Same Name of Ends；The different name of 3rd primary side winding of the transformer terminates one end of the 7th electric capacity；Another termination of 7th electric capacity The source electrode of 6th switching tube, while being also attached to the drain electrode of the 5th switching tube.

13. asymmetrical half-bridge circuit of reversed excitation according to claim 11, it is characterised in that：The primary circuit also includes the One resistance, first resistor be connected on the intermediate node after the other end of the 3rd electric capacity is connected with the first electric capacity and the second electric capacity it Between.

14. asymmetrical half-bridge circuit of reversed excitation according to claim 12, it is characterised in that：The primary circuit also includes the One resistance and second resistance, during first resistor is connected on after the other end of the 3rd electric capacity is connected with the first electric capacity and the second electric capacity Between intermediate node；Second resistance is connected on the middle node after another termination of the 4th electric capacity is connected with the second electric capacity and the 6th electric capacity Between point.

15. the asymmetrical half-bridge circuit of reversed excitation according to any one of claim 11-14, it is characterised in that：The secondary The different name end of circuit, including the first diode and the 5th electric capacity, the anode of the first diode and the first vice-side winding of transformer Connection, the negative electrode of the first diode is connected with one end of the 5th electric capacity, and output cathode is used as while drawing；5th electric capacity it is another End is connected with the Same Name of Ends of the first vice-side winding, and output negative pole is used as while drawing.