CN109742939A - A kind of two-way PFC Sofe Switch and its control method - Google Patents
A kind of two-way PFC Sofe Switch and its control method Download PDFInfo
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- CN109742939A CN109742939A CN201910018466.7A CN201910018466A CN109742939A CN 109742939 A CN109742939 A CN 109742939A CN 201910018466 A CN201910018466 A CN 201910018466A CN 109742939 A CN109742939 A CN 109742939A
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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
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- 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
A kind of two-way PFC Sofe Switch of the present invention and its control method, belong to circuit topology field；Provide the two-way PFC Sofe Switch and its control method for improving converter whole efficiency；Technical solution are as follows: a kind of two-way PFC Sofe Switch, including major loop and auxiliary branch, major loop include the first, second switching tube S1、S2, the first, second resonant capacitance C1、C2, inductance L, the first, second filter capacitor Co1、Co2, auxiliary branch includes third, the 4th switching tube S3、S4, resonant inductance Lr, transformer T and full bridge rectifier bridge, major loop are bi-directional half bridge pfc converters, and auxiliary branch assists to complete Sofe Switch of the major loop under boost mode, decompression mode, and the switching tube of auxiliary branch also realizes Sofe Switch.
Description
Technical field
A kind of two-way PFC Sofe Switch of the present invention and its control method, belong to power electronic circuit topologies field.
Background technique
In recent years, as country is to the pay attention to day by day of using energy source and consumption, people propose power-supply system higher
It is required that DC power convertor has indispensable role.The power-supply system of energy charge and discharge is widely used to country
The numerous industries vigorously supported, such as electric car, uninterruptible power supply, photovoltaic power generation, the occasions such as aeronautical power generation, it is desirable that energy can
With two-way free flow, this makes the application prospect of reversible transducer more extensive.Reversible transducer high frequency is its development
Direction, high frequency minimize converter, especially in the application of high-technology field, have pushed the small-sized of new high-tech product
Change, lighting.However, the switching loss of hard-switching converter increases with the increase of switching frequency, since output capacitance is drawn
Turn-off power loss caused by the switching losses and diode reverse recovery characteristic of the switching tube risen just seems outstanding at high frequencies
To be serious, electromagnetic interference also be will increase.Therefore, the reverse recovery loss of the switching losses and diode that reduce switching tube just seems
It is particularly important.
Currently, the method for solving the comparative maturity of above-mentioned loss is using soft switch technique.I.e. in traditional two-way changing
Increase one or more subsidiary loops, the energy and electricity for storing main switch before opening parasitic capacitance on the basis of device
The energy transfer stored when freewheeling diode forward conduction when feeling afterflow is into subsidiary loop, thus keep main switch soft open-minded,
This method can effectively reduce loss.
The above this kind of method based on soft switch technique, although the energy loss of main circuit can be solved the problems, such as successfully,
But energy in increased subsidiary loop can not be fed back in input or output again, only formal energy transfer,
Substantially there is no reduce energy loss；In addition, auxiliary switch is turn-on and turn-off in the case where hard switching, switch damage
It consumes also bigger.Therefore, the whole efficiency of system is not improved still.
Summary of the invention
A kind of two-way PFC Sofe Switch of the present invention and its control method, overcome the shortcomings of the prior art, provide one
The two-way PFC Sofe Switch of kind raising converter whole efficiency is realized and its control method.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is a kind of two-way PFC Sofe Switch, including is led back
Road and auxiliary branch；Major loop includes the first, second switching tube S1、S2, the first, second resonant capacitance C1、C2, inductance L, first,
Second filter capacitor Co1、Co2；Auxiliary branch includes third, the 4th switching tube S3、S4, resonant inductance Lr, transformer T and full-bridge are whole
Flow bridge；
First resonant capacitance C1With first switch tube S1Parallel connection, the second resonant capacitance C2With second switch S2It is in parallel；First
Switching tube S1Source electrode and second switch S2Drain electrode, inductance L one end be connected, the other end of inductance L is whole with full-bridge respectively
Flow cathode output end m, the second filter capacitor C of bridgeo2One end be connected, the second filter capacitor Co2The other end and second switch
Pipe S2Source electrode be connected；First filter capacitor Co1Both ends respectively with first switch tube S1Drain electrode, second switch S2Source electrode
It is connected；The first, third switching tube S1、S3Drain electrode be connected, third switching tube S3Source electrode and the 4th switching tube S4Drain electrode phase
Even, the second, the 4th switching tube S2、S4Source electrode be connected；The cathode output end n and the 4th switching tube S of full bridge rectifier bridge4Source electrode
It is connected；Resonant inductance LrOne end and first switch tube S1Source electrode be connected, resonant inductance LrThe other end and transformer T primary side
Different name end be connected, the Same Name of Ends of transformer T primary side and third switching tube S3Source electrode be connected；The Same Name of Ends on transformer T pair side
It is connected with the first ac input end p of full bridge rectifier bridge, the different name end on transformer T pair side exchanges defeated with the second of full bridge rectifier bridge
Enter to hold q to be connected.
Further, the first, second, third, fourth switching tube S1、S2、S3、S4It is with anti-paralleled diode spy
The power switch tube of property.
It further, further include the first, second, third, fourth diode D1、D2、D3、D4, first, second, third, fourth
Diode D1、D2、D3、D4It is followed successively by the first, second, third, fourth switching tube S1、S2、S3、S4Anti-paralleled diode.
Further, the full bridge rectifier bridge includes the five, the six, the seven, the 8th diode D5、D6、D7、 D8, the 5th,
Six diode D5、D6The branch and the seven, the 8th diode D that series connection is formed7、D8The branch circuit parallel connection that series connection is formed.
A kind of control method of two-way PFC Sofe Switch is completed based on a kind of above-mentioned two-way PFC Sofe Switch, including decompression
Mode control method and boost mode control method；The PFC Sofe Switch in buck mode, first voltage source V1With described
One filter capacitor Co1Parallel connection, the first filter capacitor Co1Both ends be voltage input end, the second filter capacitor Co2Two
End is voltage output end；The PFC Sofe Switch is under boost mode, the second voltage source V2With the second filter capacitor Co2And
Connection, the second filter capacitor Co2Both ends be voltage input end, the first filter capacitor Co1Both ends be voltage output
End.
Further, the decompression mode control method includes nine mode, and nine mode sequentially carry out completing a cycle,
It specifically includes:
Decompression mode first mode occurs in t0-t1Stage, t0Moment, resonant inductance LrOn electric current iLr=0, only first
Switching tube S1In the conductive state, the current direction of inductance L is by first voltage source V1Flow to the second voltage source V2, the mode first
Voltage source V1Energy to inductance L shift, when the energy stored on inductance L reaches maximum, turn off first switch tube S1, due to
First resonant capacitance C1Presence, first switch tube S1Realize soft switching, this mode terminates；
Decompression mode second mode occurs in t1-t2Stage, t1Moment soft switching first switch tube S1, flow through inductance L's
Current direction is due to that cannot mutate, the first resonant capacitance C1Charging, the second resonant capacitance C2Electric discharge, the inductance value phase of inductance L
To the first, second resonant capacitance C1、C2Capacitance is very big, passes through the electric current I of inductance LL1It is approximate constant, as the second resonant capacitance C2
Hold voltage by V1When dropping to 0V, this mode terminates, the duration are as follows: t12=V1·2Cr/IL1, wherein Cr=C1=C2, CrFor
Resonant capacitance；
Decompression mode third mode occurs in t2-t3Stage, t2Moment the second resonant capacitance C2End voltage drops to 0V, the
Two diode D2Naturally afterflow is connected, and by second switch S2Drain-source voltage is clamped to close to 0V, at this moment under no-voltage
Open second switch S2, second switch S2It realizes soft open-minded, opens second switch S2When, this mode terminates；
The 4th mode of decompression mode occurs in t3-t4Stage, t3Moment is soft to open second switch S2, store in inductance L
Energy passes through second switch S2Release, in shutdown second switch S2Make third switching tube S in the preceding short time3Conducting, due to
Open third switching tube S3Electric current in preceding auxiliary branch is 0A, third switching tube S3Realize soft open-minded, this mode terminates；
The 5th mode of decompression mode occurs in t4-t5Stage, t4Moment is soft to open third switching tube S3, transformer T primary side
Winding Np Same Name of Ends is positive, and vice-side winding Ns Same Name of Ends incudes positive voltage potential, the five, the 8th diode D5、D8Conducting, transformer T
Vice-side winding Ns voltage clamping in voltage source V2Voltage V2, transformer T primary side winding Np voltage clamping is in V2/ K, wherein K
=ns/np, ns、npRespectively indicate the number of turns of vice-side winding, primary side winding, resonant inductance LrThe voltage at both ends is clamped at V1-V2/
K, at this time resonant inductance LrElectric current iLrIt is linearly increasing；As resonant inductance LrElectric current iLrIncrease to inductance L electric current iL, i.e. iLr=iLWhen,
Turn off second switch S2, due to the second resonant capacitance C2Presence, second switch S2Realize soft switching, this mode terminates, holds
The continuous time are as follows:
The 6th mode of decompression mode occurs in t5-t6Stage, t5Moment soft switching second switch S2, resonant inductance LrIt opens
Begin and the first, second resonant capacitance C1、C2Resonance, resonant inductance LrIn electric current iLrIt continues growing, the first resonant capacitance C1It puts
Electricity, the second resonant capacitance C2Charging, the first resonant capacitance C1End voltage is gradually reduced, the second resonant capacitance C2End voltage gradually increases
Add, works as C2End voltage increases to V1-V2When/K, resonant inductance LrIn electric current iLrReach maximum value, this mode terminates, when continuing
Between:
The 7th mode of decompression mode occurs in t6-t7Stage, t6Moment resonant inductance LrElectric current iLrReach maximum value, later
First resonant capacitance C1Continue electric discharge, the second resonant capacitance C2Continue to charge, resonant inductance electric current iLrStart to reduce, the first resonance
Capacitor C1End voltage is gradually reduced, the second resonant capacitance C2End voltage gradually increases, as the first resonant capacitance C1End voltage is decreased to
0V, the second resonant capacitance C2End voltage increases to V1When, this mode terminates, the duration are as follows:
The 8th mode of decompression mode occurs in t7-t8Stage, t7Moment the first resonant capacitance C1End voltage is decreased to 0V, the
One diode D1Start nature and afterflow is connected, and by first switch tube S1Drain-source voltage be clamped to close to 0V, at this moment zero electricity
First switch tube S is opened in pressure1, first switch tube S1It realizes soft open-minded, opens first switch tube S1When, this mode terminates；
The 9th mode of decompression mode occurs in t8-t9Stage, t8Moment is soft to open first switch tube S1, inductance L stored up
Energy；Resonant inductance LrBoth end voltage becomes-V2/ K, resonant inductance LrIn electric current iLrContinue to reduce, as resonant inductance LrIn electricity
Flow iLrIt is reduced to turn off third switching tube S when 0A3, third switching tube S3It realizes soft switching, turns off third switching tube S3When, this mould
State terminates, the duration are as follows:
Further, the boost mode control method includes nine mode, and nine boosting mode sequentially carry out completing one
Period specifically includes:
Boost mode first mode occurs in t0-t1Stage: t0Moment, resonant inductance LrMiddle electric current iLrIt is 0, only second opens
Close pipe S2It is connected, the current direction in inductance L is by the second voltage source V2Flow to first voltage source V1, the second voltage source in the mode
V2Energy to inductance L shift, when the energy stored on inductance L reaches maximum, turn off second switch S2, due to second humorous
Shake capacitor C2Presence, second switch S2It realizes soft switching, turns off second switch S2When, this mode terminates；
Boost mode second mode occurs in t1-t2Stage, t1Moment soft switching second switch S2, flow through inductance L's
Current direction is due to that cannot mutate, the first resonant capacitance C1Electric discharge, the second resonant capacitance C2Charging, the inductance value phase of inductance L
To the first, second resonant capacitance C1、C2Capacitance is very big, passes through the electric current I of inductance LL2It is approximate constant, as the first resonant capacitance C1
When end voltage drops to 0V, this mode terminates, the duration are as follows: t12=V2·2Cr/IL2, wherein Cr=C1=C2, CrFor resonance
Capacitor；
Boost mode third mode occurs in t2-t3Stage: t2Moment the first resonant capacitance C1Both end voltage falls to 0V,
First diode D1Naturally afterflow is connected, and by first switch tube S1Drain-source voltage be clamped to close to 0V, at this moment in no-voltage
Under open first switch tube S1, first switch tube S1It realizes soft open-minded, opens first switch tube S1When, this mode terminates；
The 4th mode of boost mode occurs in t3-t4Stage: t3Moment is soft to open first switch tube S1, store in inductance L
Energy passes through first switch tube S1To first voltage source V1Transfer, in shutdown first switch tube S1The 4th is set to open in the preceding short time
Close pipe S4Conducting, due to opening the 4th switching tube S4Electric current in preceding auxiliary branch is 0A, the 4th switching tube S4Realize it is soft open-minded,
This mode terminates；
The 5th mode of boost mode occurs in t4-t5Stage: t4Moment is soft to open the 4th switching tube S4, transformer T primary side
Winding Np Same Name of Ends is negative, and vice-side winding Ns Same Name of Ends incudes negative zeta potential, the six, the 7th diode D6、D7Conducting, transformer T
Vice-side winding Ns voltage clamping in V2, transformer T primary side winding Np voltage is V2/ K, wherein K=ns/np, therefore resonance electricity
Feel LrThe voltage at both ends is clamped at V1-V2/ K, at this time resonant inductance LrElectric current iLrIt is linearly increasing, as resonant inductance LrElectric current iLr
When equal to inductance L electric current, first switch tube S is turned off1, due to the first resonant capacitance C1Presence, first switch tube S1Realize soft pass
Disconnected, this mode terminates, the duration are as follows:
The 6th mode of boost mode occurs in t5-t6Stage: t5Moment soft switching first switch tube S1, resonant inductance LrIt opens
Begin and the first, second resonant capacitance C1、C2Resonance, resonant inductance L occursrElectric current iLrIt continues growing, the first resonant capacitance C1It fills
Electricity, the second resonant capacitance C2Electric discharge, the first resonant capacitance C1End voltage gradually increases, the second resonant capacitance C2End voltage gradually subtracts
It is small, as the second resonant capacitance C2End voltage is decreased to V1-V2When/n, resonant inductance LrIn electric current iLrReach maximum value, this mould
State terminates, the duration are as follows:
The 7th mode of boost mode occurs in t6-t7Stage: t6Moment resonant inductance LrElectric current iLrReach maximum value, later
First resonant capacitance C1Continue charging, the second resonant capacitance C2Continue to discharge, resonant inductance LrElectric current iLrStart to reduce, first is humorous
Shake capacitor C1End voltage continues growing, the second resonant capacitance C2End voltage continues to reduce, as the second resonant capacitance C2Voltage is held to reduce
When to 0V, this mode terminates, the duration are as follows:
The 8th mode of boost mode occurs in t7-t8Stage: t7Moment the second resonant capacitance C2End voltage is decreased to 0, second
Diode D2 starts nature conducting afterflow, and by second switch S2Drain-source voltage be clamped to close to 0, at this moment zero electricity
Second switch S is opened in pressure2, second switch S2It realizes soft open-minded, opens second switch S2When, this mode terminates；
The 9th mode of boost mode occurs in t8-t9Stage: t8Moment is soft to open second switch S2, electric current in inductance L
Direction is by the second voltage source V2Flow to first voltage source V1, inductance L progress energy storage, resonant inductance LrBoth end voltage becomes-V2/ K,
Resonant inductance LrElectric current iLrContinue to reduce, as resonant inductance LrElectric current iLrIt is reduced to turn off the 4th switching tube S when 04, the 4th switch
Pipe S4Realize soft switching, this mode terminates, the duration are as follows:
Compared with the prior art, the invention has the following beneficial effects:
The present invention solves the moment that traditional bi-directional half bridge pfc converter is connected in main switch, rectifier switch pipe
Body diode due to reverse recovery characteristic and main switch when opening since the energy stored before its parasitic capacitance can not
The excessive problem of main switch conduction loss caused by release, and above-mentioned two parts energy loss is successfully passed through into auxiliary branch
The resonant inductance and transformer on road are fed back to voltage source V2, while the no-voltage turn-on and turn-off of major loop switching tube are realized,
And zero current passing and the shutdown of auxiliary branch switching tube, it has been obviously improved the efficiency of converter.
Detailed description of the invention
Fig. 1 is the circuit structure schematic diagram of the embodiment of the present invention；
Fig. 2 be embodiment work in buck mode first mode when equivalent circuit diagram；
Fig. 3 be embodiment work in buck mode second mode when equivalent circuit diagram；
Fig. 4 be embodiment work in buck mode third mode when equivalent circuit diagram；
Fig. 5 be embodiment work in buck mode four mode when equivalent circuit diagram；
Fig. 6 be embodiment work in buck mode five mode when equivalent circuit diagram；
Fig. 7 be embodiment work in buck mode the 6th mode, seven mode when equivalent circuit diagram；
Fig. 8 be embodiment work in buck mode eight mode when equivalent circuit diagram；
Fig. 9 be embodiment work in buck mode nine mode when equivalent circuit diagram；
Figure 10 be embodiment work inductance flows through in buck mode electric current, switching tube load voltage waveform signal
Figure；
Figure 11 is the equivalent circuit diagram that embodiment works under boost mode when first mode；
Figure 12 is the equivalent circuit diagram that embodiment works under boost mode when second mode；
Figure 13 is the equivalent circuit diagram that embodiment works under boost mode when third mode；
Figure 14 is the equivalent circuit diagram that embodiment works under boost mode when four mode；
Figure 15 is the equivalent circuit diagram that embodiment works under boost mode when five mode；
Figure 16 is the equivalent circuit diagram that embodiment works under boost mode when the 6th mode, seven mode；
Figure 17 is the equivalent circuit diagram that embodiment works under boost mode when eight mode；
Figure 18 is the equivalent circuit diagram that embodiment works under boost mode when nine mode；
Figure 19 be embodiment work inductance flows through in boost process electric current, switching tube load voltage waveform signal
Figure.
Specific embodiment
Following further describes the present invention with reference to the drawings.
As shown in Figure 1, a kind of two-way PFC Sofe Switch (PFC: Active PFC), including major loop and auxiliary branch, it is main
Circuit includes the first, second switching tube S1、S2, the first, second resonant capacitance C1、C2, inductance L, the first, second filter capacitor Co1、
Co2, auxiliary branch includes third, the 4th switching tube S3、S4, resonant inductance Lr, transformer T and full bridge rectifier bridge；
First resonant capacitance C1With first switch tube S1Parallel connection, the second resonant capacitance C2With second switch S2It is in parallel；First
Switching tube S1Source electrode and second switch S2Drain electrode, inductance L one end be connected, the other end of inductance L respectively with full-bridge rectification
The cathode output end m of bridge, the second filter capacitor Co2One end be connected, the second filter capacitor Co2The other end and second switch S2
Source electrode be connected；First filter capacitor Co1Both ends respectively with first switch tube S1Drain electrode, second switch S2Source electrode phase
Even；The first, third switching tube S1、S3Drain electrode be connected, third switching tube S3Source electrode and the 4th switching tube S4Drain electrode be connected,
The second, the 4th switching tube S2、S4Source electrode be connected；The cathode output end n and the 4th switching tube S of full bridge rectifier bridge4Source electrode phase
Even；Resonant inductance LrOne end and first switch tube S1Source electrode be connected, resonant inductance LrThe other end and transformer T primary side
Different name end is connected, the Same Name of Ends and third switching tube S of transformer T primary side3Source electrode be connected；The Same Name of Ends on transformer T pair side with
First ac input end p of full bridge rectifier bridge is connected, and the different name end on transformer T pair side exchanges input with the second of full bridge rectifier bridge
Q is held to be connected.
This PFC Sofe Switch further includes the first, second, third, fourth diode D1、D2、D3、D4, first, second, third,
4th diode D1、D2、D3、D4It is followed successively by the first, second, third, fourth switching tube S1、S2、S3、S4Anti-paralleled diode.The
One switching tube S1Source electrode and second switch S2Drain series connect and compose main bridge arm, tie point is denoted as A point；Third switch
Pipe S3Source electrode and the 4th switching tube S4Drain series connect and compose auxiliary bridge arm, tie point is denoted as B point；The upper extreme point of principal arm
(first switch tube S1Drain electrode) and auxiliary bridge arm upper extreme point (third switching tube S3Drain electrode) be connected, be denoted as C point；Main bridge arm
Lower extreme point (second switch S2Source electrode) and auxiliary bridge arm lower extreme point (the 4th switching tube S4Source electrode) be connected, be denoted as D
Point.
Full bridge rectifier bridge includes the five, the six, the seven, the 8th diode D5、D6、D7、D8, the five, the 6th diode D5、D6
The branch and the seven, the 8th diode D that series connection is formed7、D8The branch circuit parallel connection that series connection is formed.
The present invention also provides a kind of control methods of two-way PFC Sofe Switch, based on a kind of above-mentioned two-way PFC Sofe Switch
Complete, including decompression mode control method and boost mode control method, PFC Sofe Switch in buck mode, first voltage source
V1With the first filter capacitor Co1Parallel connection, the first filter capacitor Co1Both ends be voltage input end, the second filter capacitor Co2Both ends
For voltage output end；Under boost mode, the second voltage source V2With the second filter capacitor Co2Parallel connection, the second filter capacitor Co2's
Both ends are voltage input end, the first filter capacitor Co1Both ends be voltage output end.
Decompression mode control method includes nine mode, and nine decompression mode sequentially carry out completing a cycle, specific to wrap
It includes:
As shown in Fig. 2, decompression mode first mode occurs in t0-t1Stage, t0Moment resonant inductance LrOn electric current iLr=
0, only first switch tube S1In the conductive state, the current direction of inductance L is by first voltage source V1Flow to the second voltage source V2, should
Mode first voltage source V1Energy to inductance L shift, when the energy stored on inductance L reaches maximum, turn off first switch
Pipe S1, due to the first resonant capacitance C1Presence, first switch tube S1Realize soft switching, this mode terminates；
As shown in figure 3, decompression mode second mode occurs in t1-t2Stage t1Moment soft switching first switch tube S1, stream
The current direction of inductance L is crossed due to that cannot mutate, the first resonant capacitance C1Charging, the second resonant capacitance C2Electric discharge, inductance L
Inductance value with respect to the first, second resonant capacitance C1、C2Capacitance is very big, passes through the electric current I of inductance LL1It is approximate constant, when second
Resonant capacitance C2Hold voltage by V1When dropping to 0V, this mode terminates, the duration are as follows: t12=V1·2Cr/IL1, wherein Cr=
C1=C2, CrFor resonant capacitance；
As shown in figure 4, boost mode third mode occurs in t2-t3Stage t2Moment the second resonant capacitance C2It holds under voltage
It is down to 0V, the second diode D2Naturally afterflow, the second diode D is connected2Conducting by second switch S2Drain-source voltage is clamped to
Close to 0V, second switch S is at this moment opened under no-voltage2, second switch S2It realizes soft open-minded, opens second switch
S2When, this mode terminates；
As shown in figure 5, the 4th mode of decompression mode occurs in t3-t4Stage, t3Moment is soft to open second switch S2, electricity
The energy stored in sense L passes through second switch S2Release, in shutdown second switch S2Make third switching tube in the preceding short time
S3Conducting, due to opening third switching tube S3Electric current in preceding auxiliary branch is 0A, third switching tube S3Realize soft open-minded, this mould
State terminates；
As shown in fig. 6, t4Moment is soft to open third switching tube S3, transformer T primary side winding Np Same Name of Ends is positive, secondary side around
Group Ns Same Name of Ends incudes positive voltage potential, the five, the 8th diode D5、D8Conducting, the vice-side winding Ns voltage clamping of transformer T exist
Voltage source V2Voltage V2, transformer T primary side winding Np voltage clamping is in V2/ K, wherein K=ns/np, ns、npRespectively indicate pair
The number of turns of side winding, primary side winding, resonant inductance LrThe voltage at both ends is clamped at V1-V2/ K, at this time resonant inductance LrElectric current iLr
It is linearly increasing；As resonant inductance LrElectric current iLrIncrease to inductance L electric current iL, i.e. iLr=iLWhen, turn off second switch S2, due to
Two resonant capacitance C2Presence, second switch S2Realize soft switching, this mode terminates, the duration are as follows:
As shown in fig. 7, the 6th mode of decompression mode occurs in t5-t6Stage, t5Moment soft switching second switch S2, humorous
Shake inductance LrStart and the first, second resonant capacitance C1、C2Resonance, resonant inductance LrIn electric current iLrIt continues growing, first is humorous
Shake capacitor C1Electric discharge, the second resonant capacitance C2Charging, the first resonant capacitance C1End voltage is gradually reduced, the second resonant capacitance C2End
Voltage gradually increases, and works as C2End voltage increases to V1-V2When/K, resonant inductance LrIn electric current iLrReach maximum value, this mode
Terminate, the duration:
The 7th mode of decompression mode occurs in t6-t7Stage, t6Moment resonant inductance LrElectric current iLrReach maximum value, later
First resonant capacitance C1Continue electric discharge, the second resonant capacitance C2Continue to charge, resonant inductance electric current iLrStart to reduce, the first resonance
Capacitor C1End voltage is gradually reduced, the second resonant capacitance C2End voltage gradually increases, as the first resonant capacitance C1End voltage is decreased to
0V, the second resonant capacitance C2End voltage increases to V1When, this mode terminates, the duration are as follows:
As shown in figure 8, the 8th mode of decompression mode occurs in t7-t8Stage, t7Moment the first resonant capacitance C1End voltage subtracts
As low as 0V, first diode D1Start nature and afterflow, first diode D is connected1Conducting by first switch tube S1Drain-source voltage
It is clamped to close to 0V, first switch tube S is at this moment opened under no-voltage1, first switch tube S1It realizes soft open-minded, opens first
Switching tube S1When, this mode terminates；
As shown in figure 9, the 9th decompression mode occurs in t8-t9Stage, t8Moment is soft to open first switch tube S1, inductance L into
Row energy storage；Resonant inductance LrBoth end voltage becomes-V2/ K, resonant inductance LrIn electric current iLrContinue to reduce, as resonant inductance LrIn
Electric current iLrIt is reduced to turn off third switching tube S when 0A3, third switching tube S3It realizes soft switching, turns off third switching tube S3When,
This mode terminates, the duration are as follows:
Figure 10 gives the first, second, third switching tube S1、S2、S3Gate source voltage, drain-source electricity under entire decompression mode
Pressure and inductance L, resonant inductance LrWaveform diagram.When major loop is in decompression mode, the 4th switching tube S4It does not work, only third
Switching tube S3It helps out.Second switch S2Before shutdown, first by third switching tube S3Conducting, resonant inductance LrIn electricity
Stream from 0 increase to load current when, turn off second switch S2；Hereafter the electric current in resonant inductance Lr continues growing, resonance electricity
Feel Lr, the first, second resonant capacitance C1、C2Resonance will occur, the energy in resonant capacitance is moved to resonant inductance Lr, the electricity of A point
Position rises always, until resonant inductance LrWhen the voltage at both ends is 0, the electric current of resonant inductance reaches maximum value；Hereafter the electricity of A point
Position continues to rise, until first switch tube S1Drain-source voltage be 0, first diode D at this time1Afterflow, first switch tube S1Energy
It is enough to be connected under ZVS (zero voltage switch), resonant inductance LrIn electric current declined always by maximum value；First switch tube S1Conducting
Afterwards, resonant inductance LrIn electric current continue to decline, energy is all by transformer T feed-in the second voltage source V2, until its electric current drops
It is 0, third switching tube S3It can be turned off at ZCS.
Boost mode control method includes nine boosting mode, and nine decompression mode sequentially carry out completing a cycle, is had
Body includes:
As shown in figure 11, boost mode first mode occurs in t0-t1Stage t0Moment, resonant inductance LrMiddle electric current iLrFor
0, only second switch S2It is connected, the current direction in inductance L is by the second voltage source V2Flow to first voltage source V1, in the mode
The second voltage source V2Energy to inductance L shift, when the energy stored on inductance L reaches maximum, turn off second switch S2,
Due to the second resonant capacitance C2Presence, second switch S2It realizes soft switching, turns off second switch S2When, this mode terminates；
As shown in figure 12, boost mode second mode occurs in t1-t2Stage, t1Moment soft switching second switch S2, stream
The current direction of inductance L is crossed due to that cannot mutate, the first resonant capacitance C1Electric discharge, the second resonant capacitance C2Charging, inductance L
Inductance value with respect to the first, second resonant capacitance C1、C2Capacitance is very big, passes through the electric current I of inductance LL1It is approximate constant, when first
Resonant capacitance C1When end voltage drops to 0V, this mode terminates, the duration are as follows: t12=V2·2Cr/IL2, wherein C1=C2=
Cr, Cr are resonant capacitance, IL2For the load current under boost mode；
As shown in figure 13, boost mode third mode occurs in t2-t3Stage: t2Moment the first resonant capacitance C1Both ends electricity
Pressure is reduced to 0V, first diode D1Naturally afterflow, first diode D is connected1Conducting by first switch tube S1Drain-source voltage
It is clamped to close to 0V, first switch tube S is at this moment opened under no-voltage1, first switch tube S1It realizes soft open-minded, opens first
Switching tube S1When, this mode terminates；
As shown in figure 14, the 4th mode of boost mode occurs in t3-t4Stage: t3Moment is soft to open first switch tube S1, electricity
The energy stored in sense L passes through first switch tube S1To first voltage source V1Transfer, in shutdown first switch tube S1The preceding short time
Inside make the 4th switching tube S4Conducting, due to opening the 4th switching tube S4Electric current in preceding auxiliary branch is 0A, the 4th switching tube S4It is real
Existing soft open-minded, this mode terminates；
As shown in figure 15, the 5th mode of boost mode occurs in t4-t5Stage: t4Moment is soft to open the 4th switching tube S4, become
Depressor T primary side winding Np Same Name of Ends is negative, and vice-side winding Ns Same Name of Ends incudes negative zeta potential, the six, the 7th diode D6、D7It leads
Logical, the vice-side winding Ns voltage clamping of transformer T is in V2, transformer T primary side winding Np voltage is V2/ K, wherein K=ns/np,
Therefore resonant inductance LrThe voltage at both ends is clamped at V1-V2/ K, at this time resonant inductance LrElectric current iLrIt is linearly increasing, when resonance electricity
Feel LrElectric current iLrWhen equal to inductance L electric current, first switch tube S is turned off1, due to the first resonant capacitance C1Presence, first switch tube
S1Realize soft switching, this mode terminates, the duration are as follows:
As shown in figure 16, the 6th mode of boost mode occurs in t5-t6Stage: t5Moment soft switching first switch tube S1, humorous
Shake inductance LrStart and the first, second resonant capacitance C1、C2Resonance, resonant inductance L occursrElectric current iLrIt continues growing, the first resonance
Capacitor C1Charging, the second resonant capacitance C2Electric discharge, the first resonant capacitance C1End voltage gradually increases, the second resonant capacitance C2End electricity
Pressure is gradually reduced, as the second resonant capacitance C2End voltage is decreased to V1-V2When/n, resonant inductance LrIn electric current iLrReach maximum
Value, this mode terminate, the duration are as follows:
The 7th mode of boost mode occurs in t6-t7Stage: t6Moment resonant inductance LrElectric current iLrReach maximum value, later
First resonant capacitance C1Continue charging, the second resonant capacitance C2Continue to discharge, resonant inductance LrElectric current iLrStart to reduce, first is humorous
Shake capacitor C1End voltage continues growing, the second resonant capacitance C2End voltage continues to reduce, as the second resonant capacitance C2Voltage is held to reduce
When to 0V, this mode terminates, the duration are as follows:
As shown in figure 17, the 8th mode of boost mode occurs in t7-t8Stage: t7Moment the second resonant capacitance C2Hold voltage
It is decreased to 0, the second diode D2 starts nature conducting afterflow, and the conducting of the second diode D2 is by second switch S2Drain-source electricity
Pressure is clamped to close to 0, and second switch S is at this moment opened under no-voltage2, second switch S2It realizes soft open-minded, opens second
Switching tube S2When, this mode terminates；
As shown in figure 18, the 9th mode of boost mode occurs in t8-t9Stage: t8Moment is soft to open second switch S2, electricity
The current direction in L is felt by the second voltage source V2Flow to first voltage source V1, inductance L progress energy storage, resonant inductance LrBoth end voltage
Become-V2/ K, resonant inductance LrElectric current iLrContinue to reduce, as resonant inductance LrElectric current iLrIt is reduced to turn off the 4th switching tube when 0
S4, the 4th switching tube S4Realize soft switching, this mode terminates, the duration are as follows:
Figure 19 gives the first, second, the 4th switching tube S1、S2、S3Gate source voltage, drain-source electricity under entire boost mode
Pressure and inductance L, resonant inductance LrWaveform diagram.When major loop is in boost mode, third switching tube S3It does not work, only the 4th
Switching tube S4It helps out.First switch tube S1Before shutdown, first by the 4th switching tube S4Conducting, resonant inductance LrIn electricity
Stream from 0 increase to load current when, turn off first switch tube S1；Hereafter resonant inductance LrIn electric current continue growing, resonant inductance
Lr, the first, second resonant capacitance C1、C2Resonance will occur, the energy in resonant capacitance is moved to resonant inductance Lr, the current potential of A point
Decline always, until resonant inductance LrWhen the voltage at both ends is 0, resonant inductance LrElectric current reach maximum value；Hereafter the electricity of A point
Position continues to decline, until second switch S2Drain-source voltage be 0, the second diode D at this time2Afterflow, second switch S2It can
It is connected at ZVS, resonant inductance LrIn electric current declined always by maximum value；Second switch S2After conducting, resonant inductance LrIn
Electric current continue to decline, energy is all by transformer T feed-in the second voltage source V2, until its electric current is reduced to 0, the 4th switching tube
S4It can be turned off at ZCS.
Although being particularly shown and describing the present invention, those skilled in the art referring to its exemplary embodiment
It should be understood that in the case where not departing from the spirit and scope of the present invention defined by claim form can be carried out to it
With the various changes in details.
Claims (7)
1. a kind of two-way PFC Sofe Switch, it is characterised in that: including major loop and auxiliary branch；Major loop is opened including first, second
Close pipe S1、S2, the first, second resonant capacitance C1、C2, inductance L, the first, second filter capacitor Co1、Co2；Auxiliary branch includes the
Three, the 4th switching tube S3、S4, resonant inductance Lr, transformer T and full bridge rectifier bridge；
First resonant capacitance C1With first switch tube S1Parallel connection, the second resonant capacitance C2With second switch S2It is in parallel；First switch
Pipe S1Source electrode and second switch S2Drain electrode, inductance L one end be connected, the other end of inductance L respectively with full bridge rectifier bridge
Cathode output end m, the second filter capacitor Co2One end be connected, the second filter capacitor Co2The other end and second switch S2Source
Extremely it is connected；First filter capacitor Co1Both ends respectively with first switch tube S1Drain electrode, second switch S2Source electrode be connected；The
One, third switching tube S1、S3Drain electrode be connected, third switching tube S3Source electrode and the 4th switching tube S4Drain electrode be connected, second,
4th switching tube S2、S4Source electrode be connected；The cathode output end n and the 4th switching tube S of full bridge rectifier bridge4Source electrode be connected；Resonance
Inductance LrOne end and first switch tube S1Source electrode be connected, resonant inductance LrThe other end and the different name end phase of transformer T primary side
Even, the Same Name of Ends and third switching tube S of transformer T primary side3Source electrode be connected；The Same Name of Ends and full-bridge rectification on transformer T pair side
First ac input end p of bridge is connected, and the different name end on transformer T pair side is connected with the second ac input end q of full bridge rectifier bridge.
2. a kind of two-way PFC Sofe Switch according to claim 1, it is characterised in that: described first, second, third, fourth
Switching tube S1、S2、S3、S4It is the power switch tube with anti-paralleled diode characteristic.
3. a kind of two-way PFC Sofe Switch according to claim 1 to 2, it is characterised in that: further include first, second, third,
4th diode D1、D2、D3、D4, the first, second, third, fourth diode D1、D2、D3、D4Be followed successively by first, second, third,
4th switching tube S1、S2、S3、S4Anti-paralleled diode.
4. a kind of two-way PFC Sofe Switch according to claim 1, it is characterised in that: the full bridge rectifier bridge include the 5th,
Six, the seven, the 8th diode D5、D6、D7、D8, the five, the 6th diode D5、D6The branch and the seven, the 8th 2 that series connection is formed
Pole pipe D7、D8The branch circuit parallel connection that series connection is formed.
5. a kind of control method of two-way PFC Sofe Switch, it is characterised in that: double based on any described one kind of claim 1-4
It is completed to PFC Sofe Switch, including decompression mode control method and boost mode control method；The PFC Sofe Switch is in decompression mould
Under formula, first voltage source V1With the first filter capacitor Co1Parallel connection, the first filter capacitor Co1Both ends be voltage input
End, the second filter capacitor Co2Both ends be voltage output end；The PFC Sofe Switch is under boost mode, the second voltage source
V2With the second filter capacitor Co2Parallel connection, the second filter capacitor Co2Both ends be voltage input end, it is described first filtering
Capacitor Co1Both ends be voltage output end.
6. a kind of control method of two-way PFC Sofe Switch according to claim 5, it is characterised in that: the decompression mode
Control method includes nine mode, and nine mode are sequentially carried out completing a cycle, be specifically included:
Decompression mode first mode occurs in t0-t1Stage, t0Moment, resonant inductance LrOn electric current iLr=0, only first switch tube
S1In the conductive state, the current direction of inductance L is by first voltage source V1Flow to the second voltage source V2, the mode first voltage source
V1Energy to inductance L shift, when the energy stored on inductance L reaches maximum, turn off first switch tube S1, due to first humorous
Shake capacitor C1Presence, first switch tube S1Realize soft switching, this mode terminates；
Decompression mode second mode occurs in t1-t2Stage, t1Moment soft switching first switch tube S1, flow through the electric current side of inductance L
To due to that cannot mutate, the first resonant capacitance C1Charging, the second resonant capacitance C2Electric discharge, the inductance value of inductance L is with respect to the
One, the second resonant capacitance C1、C2Capacitance is very big, passes through the electric current I of inductance LL1It is approximate constant, as the second resonant capacitance C2End electricity
Pressure is by V1When dropping to 0V, this mode terminates, the duration are as follows:, wherein Cr =C1=C2, CrIt is humorous
Shake capacitor；
Decompression mode third mode occurs in t2-t3Stage, t2Moment the second resonant capacitance C2End voltage drops to 0V, the two or two pole
Pipe D2Naturally afterflow is connected, and by second switch S2Drain-source voltage is clamped to close to 0V, at this moment opens second under no-voltage
Switching tube S2, second switch S2It realizes soft open-minded, opens second switch S2When, this mode terminates；
The 4th mode of decompression mode occurs in t3-t4Stage, t3Moment is soft to open second switch S2, the energy that stores in inductance L
Pass through second switch S2Release, in shutdown second switch S2Make third switching tube S in the preceding short time3Conducting, due to open-minded
Third switching tube S3Electric current in preceding auxiliary branch is 0A, third switching tube S3Realize soft open-minded, this mode terminates；
The 5th mode of decompression mode occurs in t4-t5Stage, t4Moment is soft to open third switching tube S3, transformer T primary side winding Np
Same Name of Ends is positive, and vice-side winding Ns Same Name of Ends incudes positive voltage potential, the five, the 8th diode D5、D8Conducting, the secondary side of transformer T
Winding Ns voltage clamping is in voltage source V2Voltage V2, transformer T primary side winding Np voltage clamping is in V2/ K, wherein K=ns/np,
ns、npRespectively indicate the number of turns of vice-side winding, primary side winding, resonant inductance LrThe voltage at both ends is clamped at V1-V2/ K, it is humorous at this time
Shake inductance LrElectric current iLrIt is linearly increasing；As resonant inductance LrElectric current iLrIncrease to inductance L electric current iL, i.e. iLr=iLWhen, shutdown second is opened
Close pipe S2, due to the second resonant capacitance C2Presence, second switch S2Realize soft switching, this mode terminates, the duration are as follows:；
The 6th mode of decompression mode occurs in t5-t6Stage, t5Moment soft switching second switch S2, resonant inductance LrStart and the
One, the second resonant capacitance C1、C2Resonance, resonant inductance LrIn electric current iLrIt continues growing, the first resonant capacitance C1Electric discharge, second
Resonant capacitance C2Charging, the first resonant capacitance C1End voltage is gradually reduced, the second resonant capacitance C2End voltage gradually increases, and works as C2
End voltage increases to V1-V2When/K, resonant inductance LrIn electric current iLrReach maximum value, this mode terminates, the duration:；
The 7th mode of decompression mode occurs in t6-t7Stage, t6Moment resonant inductance LrElectric current iLrReach maximum value, later first
Resonant capacitance C1Continue electric discharge, the second resonant capacitance C2Continue to charge, resonant inductance electric current iLrStart to reduce, the first resonant capacitance
C1End voltage is gradually reduced, the second resonant capacitance C2End voltage gradually increases, as the first resonant capacitance C1End voltage be decreased to 0V,
Second resonant capacitance C2End voltage increases to V1When, this mode terminates, the duration are as follows:；
The 8th mode of decompression mode occurs in t7-t8Stage, t7Moment the first resonant capacitance C1End voltage is decreased to 0V, the one or two pole
Pipe D1Start nature and afterflow is connected, and by first switch tube S1Drain-source voltage be clamped to close to 0V, at this moment opened under no-voltage
Logical first switch tube S1, first switch tube S1It realizes soft open-minded, opens first switch tube S1When, this mode terminates；
The 9th mode of decompression mode occurs in t8-t9Stage, t8Moment is soft to open first switch tube S1, inductance L progress energy storage；Resonance
Inductance LrBoth end voltage becomes-V2/ K, resonant inductance LrIn electric current iLrContinue to reduce, as resonant inductance LrIn electric current iLrSubtract
It is small be 0A when turn off third switching tube S3, third switching tube S3It realizes soft switching, turns off third switching tube S3When, this mode terminates,
Duration are as follows: 。
7. a kind of control method of two-way PFC Sofe Switch according to claim 5, it is characterised in that: the boost mode
Control method includes nine mode, and nine boosting mode are sequentially carried out completing a cycle, be specifically included:
Boost mode first mode occurs in t0-t1Stage: t0Moment, resonant inductance LrMiddle electric current iLrIt is 0, only second switch S2
It is connected, the current direction in inductance L is by the second voltage source V2Flow to first voltage source V1, the second voltage source V in the mode2Energy
It measures and is shifted to inductance L, when the energy stored on inductance L reaches maximum, turn off second switch S2, due to the second resonant capacitance
C2Presence, second switch S2It realizes soft switching, turns off second switch S2When, this mode terminates；
Boost mode second mode occurs in t1-t2Stage, t1Moment soft switching second switch S2, flow through the electric current side of inductance L
To due to that cannot mutate, the first resonant capacitance C1Electric discharge, the second resonant capacitance C2Charging, the inductance value of inductance L is with respect to the
One, the second resonant capacitance C1、C2Capacitance is very big, passes through the electric current I of inductance LL2It is approximate constant, as the first resonant capacitance C1End electricity
When 0V is down in pressure, this mode terminates, the duration are as follows:, wherein Cr =C1=C2, CrFor resonant capacitance；
Boost mode third mode occurs in t2-t3Stage: t2Moment the first resonant capacitance C1Both end voltage falls to 0V, and the one or two
Pole pipe D1Naturally afterflow is connected, and by first switch tube S1Drain-source voltage be clamped to close to 0V, it is at this moment open-minded under no-voltage
First switch tube S1, first switch tube S1It realizes soft open-minded, opens first switch tube S1When, this mode terminates；
The 4th mode of boost mode occurs in t3-t4Stage: t3Moment is soft to open first switch tube S1, the energy that stores in inductance L
Pass through first switch tube S1To first voltage source V1Transfer, in shutdown first switch tube S1Make the 4th switching tube in the preceding short time
S4Conducting, due to opening the 4th switching tube S4Electric current in preceding auxiliary branch is 0A, the 4th switching tube S4Realize soft open-minded, this mould
State terminates；
The 5th mode of boost mode occurs in t4-t5Stage: t4Moment is soft to open the 4th switching tube S4, transformer T primary side winding Np
Same Name of Ends is negative, and vice-side winding Ns Same Name of Ends incudes negative zeta potential, the six, the 7th diode D6、D7Conducting, the secondary side of transformer T
Winding Ns voltage clamping is in V2, transformer T primary side winding Np voltage is V2/ K, wherein K=ns/np, therefore resonant inductance LrBoth ends
Voltage be clamped at V1-V2/ K, at this time resonant inductance LrElectric current iLrIt is linearly increasing, as resonant inductance LrElectric current iLrEqual to inductance L
When electric current, first switch tube S is turned off1, due to the first resonant capacitance C1Presence, first switch tube S1Realize soft switching, this mode
Terminate, the duration are as follows:；
The 6th mode of boost mode occurs in t5-t6Stage: t5Moment soft switching first switch tube S1, resonant inductance LrStart and the
One, the second resonant capacitance C1、C2Resonance, resonant inductance L occursrElectric current iLrIt continues growing, the first resonant capacitance C1Charging, second
Resonant capacitance C2Electric discharge, the first resonant capacitance C1End voltage gradually increases, the second resonant capacitance C2End voltage is gradually reduced, when the
Two resonant capacitance C2End voltage is decreased to V1-V2When/n, resonant inductance LrIn electric current iLrReach maximum value, this mode terminates, and holds
The continuous time are as follows:；
The 7th mode of boost mode occurs in t6-t7Stage: t6Moment resonant inductance LrElectric current iLrReach maximum value, later first
Resonant capacitance C1Continue charging, the second resonant capacitance C2Continue to discharge, resonant inductance LrElectric current iLrStart to reduce, the first resonance electricity
Hold C1End voltage continues growing, the second resonant capacitance C2End voltage continues to reduce, as the second resonant capacitance C2End voltage is decreased to 0V
When, this mode terminates, the duration are as follows:；
The 8th mode of boost mode occurs in t7-t8Stage: t7Moment the second resonant capacitance C2End voltage is decreased to the 0, the 2nd 2 pole
Pipe D2 starts nature conducting afterflow, and by second switch S2Drain-source voltage be clamped to close to 0, at this moment opened under no-voltage
Logical second switch S2, second switch S2It realizes soft open-minded, opens second switch S2When, this mode terminates；
The 9th mode of boost mode occurs in t8-t9Stage: t8Moment is soft to open second switch S2, current direction in inductance L
By the second voltage source V2Flow to first voltage source V1, inductance L progress energy storage, resonant inductance LrBoth end voltage becomes-V2/ K, resonance
Inductance LrElectric current iLrContinue to reduce, as resonant inductance LrElectric current iLrIt is reduced to turn off the 4th switching tube S when 04, the 4th switching tube S4
Realize soft switching, this mode terminates, the duration are as follows:。
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| CN111769754A (en) * | 2020-07-08 | 2020-10-13 | 中北大学 | Bridgeless double-boost soft switching rectifier with lowest loss of auxiliary loop |
| CN111934568A (en) * | 2020-04-16 | 2020-11-13 | 山西大学 | Bridgeless double-Boost power factor correction rectifier capable of alternately assisting current conversion up and down |
| CN111934567A (en) * | 2020-04-16 | 2020-11-13 | 山西大学 | Bridgeless double-Boost power factor correction rectifier for left-right alternate auxiliary commutation |
| CN114142762A (en) * | 2021-12-17 | 2022-03-04 | 深圳英飞源技术有限公司 | Bidirectional soft switch DC-AC converter |
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| CN109742939B (en) | 2020-10-16 |
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