CN107276374A - A kind of asymmetrical half-bridge flyback drive circuit - Google Patents
A kind of asymmetrical half-bridge flyback drive circuit Download PDFInfo
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- CN107276374A CN107276374A CN201710491902.3A CN201710491902A CN107276374A CN 107276374 A CN107276374 A CN 107276374A CN 201710491902 A CN201710491902 A CN 201710491902A CN 107276374 A CN107276374 A CN 107276374A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
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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
Abstract
The invention discloses a kind of asymmetrical half-bridge flyback drive circuit, complementary PWM generator, two driving transformers, asymmetric circuit of reversed excitation of connecting are included.Pass through the separation of driving transformer, so that the switching tube that institute's asymmetrical half-bridge circuit of reversed excitation is turned on and off is controlled respectively, improve the quality of drive signal, reduce the false triggering caused by level changes, simultaneously because of separated coiling, dead time between switching tube is mainly by complementary signal control so that the influence to dead band of driving transformer reduces to minimum；In wide scope, the application of the Switching Power Supply of high input voltage, compared with prior art, the reliability of product is set to be lifted.
Description
Technical field
The present invention relates to switch converters field, more particularly to a kind of asymmetrical half-bridge flyback drive circuit.
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, reduce further 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.It is to utilize inductance, the principle of capacitor resonance, the switching tube of Switching Power Supply is realized that no-voltage is opened or zero
Switch off current, so as to reduce the switching loss of switching tube, has been obviously improved the efficiency of product.But such as LLC and asymmetric half
Bridge etc. has the circuit of Sofe Switch function, and because its duty-cycle requirement is less than 0.5, and the stress of switching tube is equal to input electricity
Pressure, so more difficult apply in wide scope, the Switching Power Supply of high input voltage, is typically connected to the pre- voltage stabilizing link of one-level in prime,
But pre- power module of voltage regulation wide-range high-voltage application in there is also it is more the problem of, while also bringing the pressure of cost.And
Although conventional asymmetrical half-bridge circuit of reversed excitation dutycycle can be more than 0.5, the stress of its switching tube is equal to input voltage, therefore
It is not suitable for the occasion of high input voltage.It is above known technology, is no longer discussed in detail here.
Thus, connected to meet requirements above and overcoming the shortcoming in foregoing circuit to generate asymmetrical half-bridge circuit of reversed excitation
The method of pattern, by the way that primary side is connected, it is caused that secondary solves wide-range high-voltage input by the way of transformer coupled
The problem of, but for high input voltage, in the case where input voltage range change is wider, to meet having for inlet highway electric capacity
Effect is pressed, and the small, temporal consistency of semaphore request level voltage change of driving is high, while higher isolation voltage is also met,
Thus the switching tube in the asymmetrical half-bridge circuit of reversed excitation of series model is driven the complexity of change；Existing type of drive is generally light
Coupling drives or driver for isolating, and common optocoupler is difficult to meet to require, although have high-speed driving optocoupler to emerge, but it is higher
Price also lead to the increase of power supply cost, while also this high speed photo coupling needs the power supply isolated to be powered to optocoupler, this
Cause the increase of power supply cost again, while as being also a kind of contradiction for power supply itself；Existing driving is generally using a kind of
The mode of Magnetic isolation driving, but poor, the uniformity of drive signal is coupled under the conditions of multigroup drive signal, between winding
Difference, dead time is also not easily controlled, and even results in driving work abnormal；Increasing with switching tube quantity, drives simultaneously
Power consumption will further increase, also have influence on the quality of drive waveforms.
The content of the invention
In view of this, the problem of present invention is solves above-mentioned is applied to there is provided a kind of asymmetrical half-bridge flyback drive circuit
In wide scope, the asymmetrical half-bridge flyback sourse of high input voltage, enable to signal reliable operation consistent, also cause driving energy
Power is lifted.
The object of the present invention is achieved like this, a kind of asymmetrical half-bridge flyback drive circuit, including input voltage vin+,
Input voltage vin-, complementary PWM signals generator, transformer T1, electric capacity C1, electric capacity C2, electric capacity C3, diode D1, diode
D2, switching tube Q1 and switching tube Q2；Described complementary PWM signals generator produces first via pwm signal and the second tunnel of complementation
Pwm signal；Transformer T1 includes primary side winding L1, vice-side winding L2 and vice-side winding L3；The one of described first via pwm signal
End connection electric capacity C1 one end, electric capacity C1 other end connection primary side winding L1 Same Name of Ends, primary side winding L1 different name end connects
Connect the other end of first via pwm signal；Vice-side winding L2 Same Name of Ends is connected with electric capacity C2 one end, electric capacity C2 other end difference
Connect diode D1 negative electrode and switching tube Q1 grid, vice-side winding L2 different name end connect respectively diode D1 anode and
Switching tube Q1 source electrode；Vice-side winding L3 Same Name of Ends is connected with electric capacity C3 one end, electric capacity C3 other end connection diode D2
Negative electrode, vice-side winding L3 different name end connection diode D2 anode；
Also include transformer T2, electric capacity C4, electric capacity C5, electric capacity C6, diode D3, diode D4, switching tube Q3 and switch
Pipe Q4；Described transformer T2 includes primary side winding L4, copy winding L5 and vice-side winding L6；Described electric capacity C4 one end connects
One end of the second described road pwm signal is connect, the electric capacity C4 other end connects primary side winding L4 Same Name of Ends, primary side winding L4's
The other end of the second described road pwm signal of different name end connection；Vice-side winding L5 Same Name of Ends is connected with electric capacity C5 one end, electric capacity
The C5 other end connects diode D3 negative electrode and switching tube Q2 grid respectively, and vice-side winding L5 different name end connects D3 respectively
Anode and switching tube Q2 source electrode；Vice-side winding L6 Same Name of Ends is connected with electric capacity C6 one end, electric capacity C6 other end difference
Diode D4 negative electrode and switch Q4 grid are connected, vice-side winding L6 different name end connects diode D4 anode and opened respectively
Close pipe Q4 source electrode；Switching tube Q3 grid is connected to diode D2 negative electrode and the electric capacity C3 other end, switching tube Q3 source
Pole is connected to diode D2 anode and vice-side winding L3 different name end；
Switching tube Q1 drain electrode connection input voltage vin+, switching tube Q1 source electrode connecting valve pipe Q2 drain electrode；Switch
Pipe Q2 source electrode connecting valve pipe Q3 drain electrode, switching tube Q3 source electrode connecting valve pipe Q4 drain electrode, switching tube Q4 source electrode
Connection input voltage vin-.
It is preferred that, in addition to resistance R1, resistance R2, resistance R3, resistance R4, resistance R1 one end connects electric capacity C2's simultaneously
The negative electrode of the other end and diode D1, resistance R1 other end connecting valve pipe Q1 grid；Resistance R2 one end is connected simultaneously
The electric capacity C3 other end and diode D2 negative electrode, resistance R2 other end connecting valve pipe Q3 grid；Resistance R3 one end
The electric capacity C5 other end and diode D3 negative electrode, resistance R3 other end connecting valve pipe Q2 grid are connected simultaneously；Resistance
R4 one end connects the electric capacity C6 other end and diode D4 negative electrode, resistance R4 other end connecting valve pipe Q4 grid simultaneously
Pole.
It is preferred that, in addition to transformer T1 vice-side winding L7, electric capacity C7, diode D5, switching tube Q5, transformer T2
Vice-side winding L8, electric capacity C8, diode D6, switching tube Q6；Vice-side winding L7 Same Name of Ends is connected with electric capacity C7 one end, electric capacity C7
The other end connect diode D5 negative electrode and switching tube Q5 grid respectively, transformer T1 vice-side winding L7 different name end point
Not Lian Jie diode D5 anode and switching tube Q5 source electrode；Transformer T2 vice-side winding L8 Same Name of Ends and electric capacity C8 one end
Connection, the electric capacity C8 other end connects diode D6 negative electrode and switching tube Q6 grid, vice-side winding L8 different name end respectively
Diode D6 anode and switching tube Q6 source electrode are connected respectively；Q4 source electrode connects Q5 drain electrode, Q5 source electrode connection Q6's
Drain electrode, Q6 source electrode connection input voltage vin-.
It is preferred that, in addition to resistance R5 and resistance R6；Resistance R5 one end connects the electric capacity C7 other end and two poles simultaneously
Pipe D5 negative electrode, resistance R5 other end connecting valve pipe Q5 grid；Resistance R6 one end connects the another of electric capacity C8 simultaneously
End and diode D6 negative electrode, resistance R6 other end connecting valve pipe Q6 grid.
First via pwm signal and the second road pwm signal are complementary, i.e. first via first via pwm signal and the second road pwm signal
Dutycycle sum be 1.
Transformer T1 primary side winding L1 and vice-side winding L2, vice-side winding L3, vice-side winding L7 the number of turn it is identical；It is described
Transformer T2 primary side winding L4 and vice-side winding L5, vice-side winding L6, vice-side winding L8 the number of turn it is identical.
Operation principle of the present invention is summarized as follows：
During stable state, first via pwm signal is applied on electric capacity C1 and primary side winding L1, according to Same Name of Ends relation, in secondary
Winding L2 and vice-side winding L3 induce corresponding voltage, and the voltage induced is consistent with the polarity of primary side winding, now senses
The voltage gone out is applied to switching tube Q1 and switching tube Q3 grid by electric capacity C2 and electric capacity C3, makes switching tube Q1 and switching tube Q3
Simultaneously open-minded, in the positive drive signal disappearance after certain dutycycle, the signal for being applied to electric capacity C1 and primary side winding L1 disappears
Lose, now reversely, vice-side winding L2 and vice-side winding L3 polarity is also reverse due to coupled relation for primary side winding L1 polarity of voltages,
Switching tube Q1 and switching tube Q3 gate charge are taken away by electric capacity C2 and electric capacity C3 so that switching tube Q1 and switching tube Q3 is closed
It is disconnected.Because switching tube Q2 and switching tube Q4 does not drive after switching tube Q1 and switching tube Q3 shut-offs, off state is also at.
After one section of dead time, the second road pwm signal is applied on electric capacity C4 and primary side winding L4, according to Same Name of Ends
Relation, corresponding voltage is induced in vice-side winding L5 and vice-side winding L6, the voltage induced and primary side winding L4 polarity one
Cause, the voltage now induced is applied to switching tube Q2 and switching tube Q4 grid by electric capacity C5 and electric capacity C6, makes switching tube
Q2 and switching tube Q4 is simultaneously open-minded, after-applied in electric capacity C4 and primary side winding L4 blackout in the dutycycle for passing through certain,
Now above primary side winding polarity of voltage reversely, vice-side winding L5 and vice-side winding L6 polarity is also reverse due to coupled relation,
Switching tube Q2 and switching tube Q4 gate charge are taken away by electric capacity C5 and electric capacity C6 so that switching tube Q2 and switching tube Q4 is closed
It is disconnected.Because switching tube Q1 and switching tube Q3 does not drive after switching tube Q2 and switching tube Q4 shut-offs, off state is also at,
Resonance is carried out by parasitic parameter in the time that switching tube is turned off and realizes the soft open-minded of switching tube, existing document enters to this circuit
In-depth analysis is gone, the principle not to Sofe Switch is illustrated herein；
Due to complementary signal being controlled by transformer T1 and T2 respectively so that signal driving uniformity lifting,
Driving is easily controlled, while the dead time of drive signal also easily sets and adjusted so that on asymmetrical half-bridge circuit of reversed excitation
Lower two groups of power work temporal consistencies are high, improve corresponding reliability；
Compared with prior art, the invention has the advantages that：
1st, driving transformer structure is relatively easy, and close, the sequential consistent degree of drive signal is coupled between driving winding
It is very high.
2nd, the conversion of driving transformer level signal is consistent, while to be high or low, eliminates mutual between high-low pressure signal
Coupling, reduces the risk of false triggering.
3rd, the ability driven after drive signal segmentation is lifted, and drive signal is difficult distortion；
4th, cause dead time main by complementary signal control by two driving transformers, greatly reduce driving transformation
The influence of device together.
Brief description of the drawings
Fig. 1 is the complementary isolated drive circuit figure that prior art is commonly used；
Fig. 2 complementation isolated drive circuit timing diagrams；
Fig. 3 is first embodiment of the invention circuit diagram；
Fig. 4 is second embodiment of the invention circuit diagram；
Fig. 5 is third embodiment of the invention circuit diagram；
Fig. 6 is fourth embodiment of the invention circuit diagram.
Embodiment
First embodiment
Fig. 3 shows the circuit diagram of first embodiment, including input voltage vin+and Vin-, complementary PWM signals generator,
Driving transformer T1, driving transformer T2, series connection asymmetrical half-bridge circuit of reversed excitation.Complementary PWM generator can send certain dead band
The variable signal of the pulse width at interval；Driving transformer T1 includes the first capacitance C1, primary side winding L1, the second blocking electricity
Hold C2, the first diode D1, vice-side winding L2, the 3rd capacitance C3, vice-side winding L3, the second diode D2；Drive transformation
Device T2 by the 4th capacitance C4, primary side winding L4, the 5th capacitance C5, vice-side winding L5, the 3rd diode D3, the 6th every
Straight electric capacity C6, vice-side winding L6, the 4th diode D4 compositions；Asymmetrical half-bridge circuit of reversed excitation connect by first switch pipe Q1, the
Two switching tube Q2, the 3rd switching tube Q3, the 4th switching tube Q4 compositions, wherein first switch pipe Q1 and second switch pipe Q2 compositions one
To complementary circuit, the 3rd switching tube Q3 and the 4th switching tube Q4 partner complementary circuit.
Its specific annexation is：Complementary PWM signals hair, which is grown up to be a useful person, generates the complementary pwm signal of two-way, wherein first via PWM
The dutycycle of signal is D, and the dutycycle of the second road pwm signal is 1-D, and one end of first via pwm signal passes through the first blocking electricity
The Same Name of Ends for holding C1 and primary side winding L1 is connected in series, and primary side winding L1 different name end connects the other end of first via pwm signal,
Form a closed-loop path；Vice-side winding L2 Same Name of Ends and the connection of second capacitance C2 one end, the second capacitance C2's is another
One end connects diode D1 negative electrode and first switch pipe Q1 grid respectively, and vice-side winding L2 different name end connects D1's respectively
The source electrode of anode and first switch pipe Q1；Vice-side winding L3 Same Name of Ends and the connection of the 3rd capacitance C3 one end, the 3rd blocking
The electric capacity C3 other end connects diode D2 negative electrode and the 3rd switch Q3 grid, vice-side winding L3 different name end difference respectively
Connect D2 anode and the 3rd switching tube Q3 source electrode；One end of second road pwm signal passes through the first capacitance C4 and primary side
Winding L4 Same Name of Ends is connected in series, and primary side winding L4 different name end connects the other end connection of the second road pwm signal, forms one
Closed-loop path；Vice-side winding L5 Same Name of Ends and the connection of the 5th capacitance C5 one end, the 5th capacitance C5 other end point
Not Lian Jie diode D3 negative electrode and second switch pipe Q2 grid, vice-side winding L5 different name end connect respectively D3 anode and
Second switch pipe Q2 source electrode, vice-side winding L6 Same Name of Ends and the connection of the 6th capacitance C6 one end, the 6th capacitance C6
The other end connect respectively diode D4 negative electrode and the 4th switch Q4 grid, vice-side winding L6 different name end connects D4 respectively
Anode and the 4th switching tube Q4 source electrode.
Switching tube Q1 drain electrode connection input voltage vin+, switching tube Q4 source electrode connection input voltage vin-, Q1 source
Pole connects Q2 drain electrode, and Q2 source electrode connects Q3 drain electrode, and Q3 source electrode connects Q4 drain electrode.
The present embodiment operation principle is as follows：
First via pwm signal is applied to primary side winding L1 two ends by electric capacity C1, and primary side winding L1 Same Name of Ends is different for just
Name end is negative, due to the relation of close-coupled, and now vice-side winding L2 and L3 Same Name of Ends induces positive voltage, and different name end is negative
Voltage, the voltage at L2 and L3 two ends is applied to switching tube Q1 and Q3 grid by electric capacity C2 and electric capacity C3 respectively so that switch
Pipe Q1 and switching tube Q3 are open-minded；Switching tube Q1 and switching tube Q3 conductings are kept for dutycycle D time, afterwards first via pwm signal
For low level, now the voltage at electric capacity C1 two ends is applied to above primary side winding L1, and L1 different names terminal voltage is just, terminal voltage of the same name
It is negative, due to coupled relation, the polarity of vice-side winding L2 and L3 induced voltage also changes therewith, Same Name of Ends is negative, and different name end is
Just, switching tube Q1 and switching tube Q3 gate charge are taken away by electric capacity C2 and electric capacity C3 respectively so that switching tube Q1 and open
Pipe Q3 is closed to disconnect；
After one section of dead time, the second road pwm signal is applied to primary side winding L4 two ends, and L4 Same Name of Ends is
Just, different name end is negative, due to the relation of close-coupled, and now vice-side winding L5 and L6 Same Name of Ends induces positive voltage, different name
Hold as negative voltage, the voltage at L5 and L6 two ends is applied to switching tube Q2 and Q4 grid by electric capacity C5 and electric capacity C6, made respectively
Obtain switching tube Q2 and switching tube Q4 open-minded；Kept for dutycycle 1-D time, the second road pwm signal is low level afterwards, now electric
The voltage for holding C4 two ends is applied to above primary side winding L4, and L4 different names terminal voltage is just, terminal voltage of the same name is negative, because coupling is closed
System, the polarity of vice-side winding L5 and L6 induced voltage also changes therewith, and Same Name of Ends is negative, and different name end is just, to pass through electric capacity respectively
C5 and electric capacity C6 take switching tube Q2 and switching tube Q4 gate charge away so that switching tube Q2 and switching tube Q4 disconnects；
Advantages of the present invention is apparent：
1st, the conversion of driving transformer level signal is consistent, while to be high or low, eliminates and turns on and off between signal
Mutual coupling, reduces the risk of false triggering.
2nd, cause dead time main by complementary signal control by two driving transformers, greatly reduce and open and close
Break signal is coupling in the influence of driving transformer together；
3rd, the signal and the signal of shut-off opened are separated, it is not necessary to while transferring energy to the switch turned on and off
Pipe, the ability of driving is lifted, and drive signal is difficult distortion；
4th, driving transformer coiling is simple, it is not necessary to distinguish two kinds of different Same Name of Ends in same inside transformer.
Second embodiment
Fig. 4 is the circuit diagram of the second example, is with first embodiment difference, is distinguished in the grid of each switching tube
Tandem drive resistance R1, R2, R3 and R4.Its specific annexation is：Resistance R1 one end connects the C2 other end and two simultaneously
Pole pipe D1 negative electrode, R1 other end connecting valve pipe Q1 grid；Resistance R2 one end connects the C3 other end and two simultaneously
Pole pipe D2 negative electrode, R2 other end connecting valve pipe Q3 grid；Resistance R3 one end connects the C5 other end and two simultaneously
Pole pipe D3 negative electrode, R3 other end connecting valve pipe Q2 grid；Resistance R4 one end connects the C6 other end and two simultaneously
Pole pipe D4 negative electrode, R4 other end connecting valve pipe Q4 grid.
Its operation principle is identical with first embodiment, will not be repeated here.
3rd embodiment
Fig. 5 is the circuit diagram of the 3rd example, is with first embodiment difference, asymmetrical half-bridge circuit of reversed excitation is by three
To series connection, possess six switching tubes, driving transformer T1 and driving transformer T2 are made up of four groups of windings respectively, implement first
On the basis of example, component transformer T1 vice-side winding L7, electric capacity C7, diode D5, switching tube Q5 is increased newly；Transformer T2's
Vice-side winding L8, electric capacity C8, diode D6, switching tube Q6.The annexation of newly-increased element is：Vice-side winding L7 Same Name of Ends and
Electric capacity C7 one end is connected, and the electric capacity C7 other end connects diode D5 negative electrode and switching tube Q5 grid, vice-side winding respectively
L7 different name end connects diode D5 anode and switching tube Q5 source electrode respectively；Vice-side winding L8 Same Name of Ends and electric capacity C8 mono-
End connection, the electric capacity C8 other end connects diode D6 negative electrode and switching tube Q6 grid, vice-side winding L8 different name respectively
End connects diode D6 anode and switching tube Q6 source electrode respectively.Q4 source electrode connects Q5 drain electrode, Q5 source electrode connection Q6
Drain electrode, Q6 source electrode connection input voltage vin-.
The operation principle be the same as Example one of driving transformer, is not illustrated herein.
Fourth embodiment
Fig. 6 is the circuit diagram of the 4th example, is with 3rd embodiment difference, is distinguished in the grid of each switching tube
Tandem drive resistance R1, R2, R3, R4, R5 and R6.Its newly-increased annexation is：Resistance R1 one end connects the another of C2 simultaneously
One end and diode D1 negative electrode, R1 other end connecting valve pipe Q1 grid；Resistance R2 one end connects the another of C3 simultaneously
One end and diode D2 negative electrode, R2 other end connecting valve pipe Q3 grid；Resistance R3 one end connects the another of C5 simultaneously
One end and diode D3 negative electrode, R3 other end connecting valve pipe Q2 grid；Resistance R4 one end connects the another of C6 simultaneously
One end and diode D4 negative electrode, R4 other end connecting valve pipe Q4 grid；Resistance R5 one end connects the another of C7 simultaneously
One end and diode D5 negative electrode, R5 other end connecting valve pipe Q5 grid；Resistance R6 one end connects the another of C8 simultaneously
One end and diode D6 negative electrode, R6 other end connecting valve pipe Q6 grid.
Its operation principle is identical with 3rd embodiment, will not be repeated here.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, for those skilled in the art, without departing from the spirit and scope of the present invention, also
Some improvements and modifications can be made, driving transformer is further added by one or more vice-side windings；These improvements and modifications also should
It is considered as protection scope of the present invention, is no longer repeated here with embodiment, protection scope of the present invention should be limited with claim
Fixed scope is defined.
Claims (6)
1. a kind of asymmetrical half-bridge flyback drive circuit, including input voltage vin+, input voltage vin-, complementary PWM signals hair
Raw device, transformer T1, electric capacity C1, electric capacity C2, electric capacity C3, diode D1, diode D2, switching tube Q1 and switching tube Q2；It is described
Complementary PWM signals generator produce complementary first via pwm signal and the second road pwm signal；Transformer T1 include primary side around
Group L1, vice-side winding L2 and vice-side winding L3；One end connection electric capacity C1 of described first via pwm signal one end, electric capacity C1
Other end connection primary side winding L1 Same Name of Ends, primary side winding L1 different name end connects the other end of first via pwm signal；It is secondary
Side winding L2 Same Name of Ends is connected with electric capacity C2 one end, and the electric capacity C2 other end connects diode D1 negative electrode and switching tube respectively
Q1 grid, vice-side winding L2 different name end connects diode D1 anode and switching tube Q1 source electrode respectively；Vice-side winding L3
Same Name of Ends be connected with electric capacity C3 one end, electric capacity C3 other end connection diode D2 negative electrode, vice-side winding L3 different name end
Connect diode D2 anode；
It is characterized in that：Also include transformer T2, electric capacity C4, electric capacity C5, electric capacity C6, diode D3, diode D4, switching tube Q3
With switching tube Q4；Described transformer T2 includes primary side winding L4, copy winding L5 and vice-side winding L6；Described electric capacity C4's
One end of the second described road pwm signal of one end connection, electric capacity C4 other end connection primary side winding L4 Same Name of Ends, primary side around
The other end of the second road pwm signal described in group L4 different name end connection；Vice-side winding L5 Same Name of Ends connects with electric capacity C5 one end
Connect, the electric capacity C5 other end connects diode D3 negative electrode and switching tube Q2 grid, vice-side winding L5 different name end point respectively
Not Lian Jie D3 anode and switching tube Q2 source electrode；Vice-side winding L6 Same Name of Ends is connected with electric capacity C6 one end, and electric capacity C6's is another
One end connects diode D4 negative electrode and switch Q4 grid respectively, and vice-side winding L6 different name end connects diode D4's respectively
The source electrode of anode and switching tube Q4；Switching tube Q3 grid is connected to diode D2 negative electrode and the electric capacity C3 other end, switch
Pipe Q3 source electrode is connected to diode D2 anode and vice-side winding L3 different name end；
Switching tube Q1 drain electrode connection input voltage vin+, switching tube Q1 source electrode connecting valve pipe Q2 drain electrode；Switching tube Q2
Source electrode connecting valve pipe Q3 drain electrode, switching tube Q3 source electrode connecting valve pipe Q4 drain electrode, switching tube Q4 source electrode connection
Input voltage vin-.
2. a kind of asymmetrical half-bridge flyback drive circuit according to claim 1, it is characterised in that：Also include resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R1 one end connect the electric capacity C2 other end and diode D1 negative electrode, resistance simultaneously
R1 other end connecting valve pipe Q1 grid；Resistance R2 one end connects the electric capacity C3 other end and diode D2 the moon simultaneously
Pole, resistance R2 other end connecting valve pipe Q3 grid；Resistance R3 one end connects the electric capacity C5 other end and two poles simultaneously
Pipe D3 negative electrode, resistance R3 other end connecting valve pipe Q2 grid；Resistance R4 one end connects the another of electric capacity C6 simultaneously
End and diode D4 negative electrode, resistance R4 other end connecting valve pipe Q4 grid.
3. a kind of asymmetrical half-bridge flyback drive circuit according to claim 1 or 2, it is characterised in that：Also include transformation
Device T1 vice-side winding L7, electric capacity C7, diode D5, switching tube Q5, transformer T2 vice-side winding L8, electric capacity C8, diode
D6, switching tube Q6；Vice-side winding L7 Same Name of Ends is connected with electric capacity C7 one end, and the electric capacity C7 other end connects diode D5 respectively
Negative electrode and switching tube Q5 grid, transformer T1 vice-side winding L7 different name end connects diode D5 anode and opened respectively
Close pipe Q5 source electrode；Transformer T2 vice-side winding L8 Same Name of Ends is connected with electric capacity C8 one end, electric capacity C8 other end difference
Connect diode D6 negative electrode and switching tube Q6 grid, vice-side winding L8 different name end connect respectively diode D6 anode and
Switching tube Q6 source electrode；Q4 source electrode connects Q5 drain electrode, and Q5 source electrode connects Q6 drain electrode, Q6 source electrode connection input voltage
Vin-。
4. a kind of asymmetrical half-bridge flyback drive circuit according to claim 3, it is characterised in that：Also include resistance R5 and
Resistance R6；Resistance R5 one end connects the electric capacity C7 other end and diode D5 negative electrode, resistance R5 other end connection simultaneously
Switching tube Q5 grid；Resistance R6 one end connects the electric capacity C8 other end and diode D6 negative electrode simultaneously, and resistance R6's is another
One end connecting valve pipe Q6 grid.
5. a kind of asymmetrical half-bridge flyback drive circuit according to claim 4, it is characterised in that：The described first via
Pwm signal and the second road pwm signal are complementary, i.e. the dutycycle sum of first via first via pwm signal and the second road pwm signal is
1。
6. a kind of asymmetrical half-bridge flyback drive circuit according to claim 5, it is characterised in that：Described transformer T1
Primary side winding L1 it is identical with vice-side winding L2, vice-side winding L3, vice-side winding the L7 number of turn；Described transformer T2 primary side
Winding L4 is identical with vice-side winding L5, vice-side winding L6, vice-side winding the L8 number of turn.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108322021A (en) * | 2017-12-28 | 2018-07-24 | 上海澳通韦尔电力电子有限公司 | A kind of accessory power supply driving circuit for high voltage dc bus power supply |
| CN109004838A (en) * | 2018-07-13 | 2018-12-14 | 广州金升阳科技有限公司 | High voltage flyback converter |
| CN110266195A (en) * | 2019-07-23 | 2019-09-20 | 上海麟荣电子技术有限公司 | A kind of circuit of reversed excitation |
| CN112332821A (en) * | 2020-12-02 | 2021-02-05 | 中北大学 | MOSFET passive isolation direct connection prevention quick-closing drive circuit |
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| CN101997420A (en) * | 2010-11-11 | 2011-03-30 | 江苏大学 | Asymmetric half-bridge magnetic coupling drive circuit |
| CN104779806A (en) * | 2015-04-30 | 2015-07-15 | 广州金升阳科技有限公司 | Asymmetrical half-bridge fly-back converter and control method thereof |
| CN105375783A (en) * | 2015-11-13 | 2016-03-02 | 广州金升阳科技有限公司 | Feedback control method, feedback control method based control method for asymmetric half bridge type flyback converter, and realization circuits for two methods |
| CN206922641U (en) * | 2017-06-26 | 2018-01-23 | 广州金升阳科技有限公司 | A kind of asymmetrical half-bridge flyback drive circuit |
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| CN101997420A (en) * | 2010-11-11 | 2011-03-30 | 江苏大学 | Asymmetric half-bridge magnetic coupling drive circuit |
| CN104779806A (en) * | 2015-04-30 | 2015-07-15 | 广州金升阳科技有限公司 | Asymmetrical half-bridge fly-back converter and control method thereof |
| CN105375783A (en) * | 2015-11-13 | 2016-03-02 | 广州金升阳科技有限公司 | Feedback control method, feedback control method based control method for asymmetric half bridge type flyback converter, and realization circuits for two methods |
| CN206922641U (en) * | 2017-06-26 | 2018-01-23 | 广州金升阳科技有限公司 | A kind of asymmetrical half-bridge flyback drive circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108322021A (en) * | 2017-12-28 | 2018-07-24 | 上海澳通韦尔电力电子有限公司 | A kind of accessory power supply driving circuit for high voltage dc bus power supply |
| CN108322021B (en) * | 2017-12-28 | 2021-05-04 | 上海澳通韦尔电力电子有限公司 | Auxiliary power supply driving circuit for high-voltage direct-current bus power supply |
| CN109004838A (en) * | 2018-07-13 | 2018-12-14 | 广州金升阳科技有限公司 | High voltage flyback converter |
| CN109004838B (en) * | 2018-07-13 | 2023-11-24 | 广州金升阳科技有限公司 | High withstand voltage flyback converter |
| CN110266195A (en) * | 2019-07-23 | 2019-09-20 | 上海麟荣电子技术有限公司 | A kind of circuit of reversed excitation |
| CN112332821A (en) * | 2020-12-02 | 2021-02-05 | 中北大学 | MOSFET passive isolation direct connection prevention quick-closing drive circuit |
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|---|---|
| CN107276374B (en) | 2023-10-20 |
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