CN108390567A - A kind of zero voltage switch synchronous rectification Boost circuit, zero voltage switch Boost circuit and its control method - Google Patents
A kind of zero voltage switch synchronous rectification Boost circuit, zero voltage switch Boost circuit and its control method Download PDFInfo
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- CN108390567A CN108390567A CN201810294727.3A CN201810294727A CN108390567A CN 108390567 A CN108390567 A CN 108390567A CN 201810294727 A CN201810294727 A CN 201810294727A CN 108390567 A CN108390567 A CN 108390567A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/0048—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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/342—Active non-dissipative snubbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The present invention provides a kind of zero voltage switch synchronous rectification Boost circuit, the Boost circuit and its control method of zero voltage switch, auxiliary resonance circuit is sealed in the rectification circuit of main power circuit, after master power switch pipe turns off, realize that the no-voltage of auxiliary switch is connected using the electric current of Boost boost inductances, then realize that the electric current for quickly increasing and promoting resonant inductance of resonant inductance electric current is more than the electric current of Boost boost inductances using the resonance of resonant capacitance and resonant inductance, and utilize the afterflow of the diode pair resonant inductance electric current in parallel with resonant capacitance, with ensure resonant capacitance voltage will not reversed and resonant inductance electric current will not quickly reduce after reaching a maximum value.After auxiliary switch turns off, realize that the no-voltage of main switch is open-minded using the difference of resonance current and Boost boost inductor currents.
Description
Technical field
The present invention relates to power electronic circuit more particularly to a kind of zero voltage switch Boost circuits and its control method.
Background technology
A kind of traditional power supply block diagram is as shown in Figure 1, AC input is converted into DC voltage supply by bridge rectifier 11
Boost 20, the Boost provide power-factor correction function to meet professional standard or merely by wave
Larger voltage transformation is moved to a smaller voltage range of a stable voltage or variation range, the DC/DC of rear class becomes
The output voltage of the Boost is transformed to the voltage needed for load and realizes the effect of isolation by parallel operation.Normal conditions,
The voltage stabilizing value of AC input ranging from 85~265VAC, Boost are 400V or voltage stabilized range is 200~400V.Prime
The output voltage range of Boost circuit is narrower, and rear class DC/DC converter designs are simpler, the performance that can reach is better.
A kind of traditional Boost 20 is as shown in Fig. 2, when main switch 22 enters under the action of control circuit 26
When conducting state, one end of inductance 21 is shorted to ground by main switch 22, and the other end of the inductance 21 and power supply positive
Even, therefore input voltage vin rises the electric current made in inductance 21.Meanwhile in the turn-on time of main switch 22, two pole of rectification
23 reverse bias of pipe and be in cut-off state, 24 powering load of output filter capacitor.When main switch 22 is by control circuit 26
When shutdown, inductive current cannot be mutated, and the energy being stored in 22 turn-on time of main switch in inductance 21 can be by whole
Flow the supply load of diode 23.Output filter capacitor 24 maintains output voltage to be essentially constant.The turn-on time of main switch 22
It is determined by control circuit 26 with the turn-off time, to ensure that output voltage is the voltage value of some setting.
With the progress of power electronic technique, power electronic circuit develops towards high frequency, miniaturization.Because of work
The raising of working frequency, power module can use smaller device, possess smaller volume.Above-mentioned traditional Boost is become
Parallel operation 20, there are switching losses for the switching process of main switch 22, and in continuous current mode, and rectifier diode 23 exists
Reverse recovery loss, thus high-frequency work obviously increasing the switching loss for causing above-mentioned traditional Boost 20 simultaneously
The significant decrease for leading to module efficiency, due to the increase of transducer loose, the reduction of volume, module heating is serious, and reliability is aobvious
Writing reduces.The converter of zero voltage switch can substantially reduce switching loss, thus, the converter of zero voltage switch increasingly draws
Play the concern of people.
It is a kind of it is existing realize ZVS Boost circuit be synchronous rectification Boost circuit as in Figure 6-1, take PWM
Control, Fig. 6-2 show its work schedule waveform, realize that it is electric that Boost boosts using output voltage and synchronous rectification diode
The negative sense excitation of sense realizes main switch ZVS using the inductive current of negative sense, realizes that the condition of the course of work is circuit work
Make in DCM patterns, i.e. inductive current zero passage.The circuit is suitble to lower-powered occasion, and negative current obviously increases at light load
Add, light-load efficiency is not high.
The synchronous rectification Boost and its control block diagram of existing another kind typical control methods are as shown in fig. 7, inspection
Negative current, input voltage vin and the output voltage Vout of Boost boost inductances are surveyed to control, wherein detecting Vout to control
Output voltage stabilization detects Vin the minimum value of boost inductance negative current is arranged, and detects boost inductance negative current to control
The shutdown of synchronous rectification diode controls for PFM.Working frequency higher at light load, light-load efficiency are relatively low；High pressure works at light load
Frequency higher, high pressure light-load efficiency are lower.
Invention content
Have in view of that, the present invention provides the Boost of a kind of zero voltage switch synchronous rectification Boost circuit, zero voltage switch
Circuit and its control method solve continuous current mode rectifier diode to solve the problems, such as that high-frequency work switching loss is excessive
Existing reverse-recovery problems, while also solving the problems, such as EMI caused by hard switching.While in order to improve light-load efficiency, this hair
It is bright that a kind of light load control method is also provided, to further increase the whole efficiency of Boost converters.And the control method
It is automatic to adapt to DCM (discontinuous conduct mode) and CCM (continuous current mode) operating mode.
A kind of zero voltage switch Boost circuit, including boost inductance 31, main switch 32, rectifier diode 33, output filter
Wave capacitance 34 and control circuit 36 also include zero voltage switch circuit 40；
One end connection input voltage of boost inductance 31+, the drain electrode of the other end connection main switch 32 of boost inductance 31,
The source electrode of main switch 32 connects input voltage-, the output end all the way of the grid connection control circuit of main switch 32；Output
The both ends output voltage Vout of filter capacitor 34 powers to successive load；The control circuit 36 is produced according to output voltage Vout
Raw feedback voltage signal and the duty ratio that main switch 32 is adjusted according to feedback voltage signal；The zero voltage switch circuit 40
Input terminal is connected with the other end of boost inductance 31, output end and the rectifier diode 33 of the zero voltage switch circuit 40
Anode be connected, the control terminal of the zero voltage switch circuit 40 is connected with the another way output end of control circuit；The rectification
The anode of the cathode connection output filter capacitor 34 of diode 33.
Preferably, zero voltage switch Boost circuit further includes a CS current detection circuit, the CS current detection circuits
Input terminal connection main switch 32 source electrode, the electric current of the source electrode for detecting main switch 32；The CS current detectings electricity
The output end on road connects control circuit.
Preferably, the zero voltage switch circuit 40 includes resonant inductance 41, auxiliary switch 42, resonant capacitance 44,
Input terminal of the one end of resonant inductance 41 as zero voltage switch circuit 40, the other end of resonant inductance 41 is as zero voltage switch
The output end of circuit 40；One end of the source electrode connection resonant inductance 41 of auxiliary switch 42, the drain electrode connection of auxiliary switch 42
The anode of resonant capacitance 44, the other end of the cathode connection resonant inductance 41 of resonant capacitance 44；The grid of auxiliary switch 42 is made
For the control terminal of zero voltage switch circuit 40.
Preferably, the zero voltage switch circuit 40 further includes booster diode 43, and the cathode of booster diode 43 connects
Connect the anode of resonant capacitance 44, the cathode of the anode connection resonant capacitance 44 of booster diode 43.
Preferably, control circuit controls the control of main switch 32 and auxiliary switch 42 for complementary drive.
Preferably, main switch 32 and auxiliary switch 42 are metal-oxide-semiconductor or IGBT, and the booster diode 43 is Schottky
Diode.
A kind of control method of zero voltage switch Boost circuit：CS current detection circuits detect the peak value of main switch 32
Electric current keeps this minimum peak electric current no longer to reduce when the peak point current is reduced to the reference value of setting from control,
When input voltage raising or load continue to reduce, and 32 peak point current of main switch is caused to have the tendency that continuing to reduce, pass through drop
The working frequency of low main switch 32 stablizes the output of Boost circuit；And when the working frequency of main switch 32 reaches minimum
Then enter frequency hopping when working frequency to work.
A kind of synchronous rectification Boost circuit of zero voltage switch, including boost inductance 31, main switch 32, output filtering
Capacitance 34, synchronous rectification switch pipe 81 also include zero voltage switch circuit 40；
One end connection input voltage of boost inductance 31+, the drain electrode of the other end connection main switch 32 of boost inductance 31,
The source electrode of main switch 32 connects input voltage-, the output end all the way of the grid connection control circuit of main switch 32；Output
The both ends output voltage Vout of filter capacitor 34 powers to successive load；The control circuit 36 is produced according to output voltage Vout
Raw feedback voltage signal and the duty ratio that main switch 32 is adjusted according to feedback voltage signal；The zero voltage switch circuit 40
Input terminal is connected with the drain electrode of main switch 32, output end and the synchronous rectification switch pipe 81 of the zero voltage switch circuit 40
Source electrode be connected, the control terminal of the zero voltage switch circuit 40 is connected with the another way output end of control circuit；The synchronization
The anode of the drain electrode connection output filter capacitor 34 of rectifier switch pipe 81, grid and the control electricity of the synchronous rectification switch pipe 81
The third road output end on road is connected.
Preferably, the zero voltage switch circuit 40 includes resonant inductance 41, auxiliary switch 42, resonant capacitance 44,
Input terminal of the one end of resonant inductance 41 as zero voltage switch circuit 40, the other end of resonant inductance 41 is as zero voltage switch
The output end of circuit 40；One end of the source electrode connection resonant inductance 41 of auxiliary switch 42, the drain electrode connection of auxiliary switch 42
The anode of resonant capacitance 44, the other end of the cathode connection resonant inductance 41 of resonant capacitance 44；The grid of auxiliary switch 42 is made
For the control terminal of zero voltage switch circuit 40.
Preferably, main switch 32 and 42 complementary drive of auxiliary switch, auxiliary switch 42 and synchronous rectification switch pipe
81 synchronize driving.
Preferably, the zero voltage switch circuit 40 further includes booster diode 43, and the cathode of booster diode 43 connects
Connect the anode of resonant capacitance 44, the cathode of the anode connection resonant capacitance 44 of booster diode 43.
Itself with regard to circuit, the object of the invention is realized in, and is sealed in the rectification circuit of main power circuit auxiliary
Resonance circuit is helped, after master power switch pipe turns off, the no-voltage of auxiliary switch is realized using the electric current of Boost boost inductances
Then conducting realizes quickly increasing and promoting resonance electric for resonant inductance electric current using the resonance of resonant capacitance and resonant inductance
The electric current of sense is more than the electric current of Boost boost inductances, and utilizes the diode pair resonant inductance electric current in parallel with resonant capacitance
Afterflow, with ensure resonant capacitance voltage will not reversed and resonant inductance electric current will not quickly subtract after reaching a maximum value
It is small.After auxiliary switch turns off, the zero of main switch is realized using the difference of resonance current and Boost boost inductor currents
Voltage is open-minded.
For control, no-voltage Boost circuit of the invention simply can realize main switch using complementary drive
The function that the no-voltage of pipe and auxiliary switch pipe is opened only needs sampling and outputting voltage to control in this simple control is realized
The turn-on time of main switch.Voltage stress very little before auxiliary switch conducting, thus can be immediately after supervisor's shutdown
Open auxiliary switch, that is to say, that this dead time can be very short；But the voltage stress before main switch conducting is
Vout needs the regular hour that can just be extracted into zero, therefore auxiliary switch pipe turns off and needs to stay suitably between being connected with main switch
Dead time.
For underloading controls, in order to improve no-voltage Boost circuit of the present invention in efficiency at light load, the present invention proposes
A kind of method for realizing frequency reducing control on the basis of complementation controls, on the basis of sampling and outputting voltage samples main switch
Peak point current, when the load decreases, main switch peak point current reduce, when load reduce to a certain extent when circuit enter
DCM patterns work.This minimum peak electric current is kept no longer to reduce from control when peak point current reduces to a certain extent, i.e.,
Minimum peak current control, that is to say, that by reducing the working frequency of switching tube come stabilization transform device when load continues to reduce
Output, and then enter frequency hopping (Burst) operating mode when working frequency reaches minimum frequency of operation, which can guarantee underloading
Still the ZVS (no-voltage is open-minded) that main switch and auxiliary switch pipe are realized while frequency reducing is conducive to the underloading effect of hoisting module
Rate and EMI performances.
Compared with prior art, the present invention has the advantages that：
(1) it realizes that ZVS work is not limited by operating mode, main switch can be realized under CCM patterns and DCM patterns
With the ZVS of auxiliary switch；
(2) application is simple；
(3) rectifier diode electric current natural zero-crossing turns off, and reverse-recovery problems are not present；
(4) underloading frequency reducing work, light-load efficiency higher are also easily achieved under complementary drive；
(5) realization of ZVS does not influence the electric current of Boost boost inductances, the electric currents of Boost boost inductances will not zero passage, can
It is controlled for PFC；
(6) when applied to synchronous rectification Boost circuit, Boost boost inductances can be achieved with master without negative sense excitation and open
The no-voltage for closing pipe is open-minded.
Description of the drawings
Fig. 1 is traditional power supply block diagram；
Fig. 2 is traditional diode rectification Boost schematic diagram；
Fig. 3 is 1 circuit diagram of no-voltage Boost circuit embodiments and control block diagram according to the present invention；
Fig. 4 is the operation mode figure that example 1 is applied according to the no-voltage Boost of the present invention；
Fig. 5 is the work wave that example 1 is applied according to the no-voltage Boost of the present invention；
Fig. 6-1 is a kind of existing synchronous rectification Boost and its control block diagram；
Fig. 6-2 is the control sequential figure of synchronous rectification Boost shown in Fig. 6-1；
Fig. 7 is the existing synchronous rectification Boost and its control block diagram with another control mode；
Fig. 8-1 is 2 circuit diagram of no-voltage Boost circuit embodiment and control block diagram according to the present invention；
Fig. 8-2 is the frequency variation curve schematic diagram according to the no-voltage Boost circuit embodiment 2 of the present invention；
Fig. 9 is 3 circuit diagram of no-voltage Boost circuit embodiment according to the present invention；
Figure 10 is 4 circuit diagram of no-voltage Boost circuit embodiment according to the present invention；
Specific implementation mode
First embodiment
Fig. 3 show zero voltage switch Boost circuit according to the present invention and applies 1 schematic diagram of example, with traditional Boost circuit class
Seemingly, the zero voltage switch Boost circuit 30 includes boost inductance 31, main switch 32, rectifier diode 33, output filtered electrical
Hold 34 and control circuit 36, the both ends output voltage Vout of output filter capacitor 34 gives load 35 power supply；The control circuit
36 generate feedback voltage signal according to output voltage Vout and adjust the duty ratio of main switch 32 according to feedback voltage signal；It rises
One end connection input voltage of voltage inductance 31+, the drain electrode of the other end connection main switch 32 of boost inductance 31, main switch 32
Source electrode connect input voltage-, main switch 32 grid connection control circuit output end all the way.With traditional Boost electricity
Unlike road, the zero voltage switch Boost circuit 30 also includes zero voltage switch circuit 40, the zero voltage switch circuit
40 input terminal is connected with the other end of boost inductance 31, and output end is connected with the anode of the rectifier diode 33, control terminal
It is connected with the another way output end of control circuit.
The zero voltage switch circuit 40 includes resonant inductance 41, auxiliary switch 42, booster diode 43, resonant capacitance
44, the other end of one end connection boost inductance 31 of resonant inductance 41, the other end of resonant inductance 41 connects rectifier diode 33
Anode, rectifier diode 33 cathode connection output filter capacitor 34 anode；The source electrode of auxiliary switch 42 connects resonance
The drain electrode of one end of inductance 41, auxiliary switch 42 is separately connected the anode of resonant capacitance 44 and the cathode of booster diode 43,
The anode of the cathode connection booster diode 43 of resonant capacitance 44 and the other end for being connected to resonant inductance 41.
Ds1 and Cs1 is respectively the parasitic diode and parasitic capacitance of main switch 32 in Fig. 3, is not deposited in actual circuit
；Equally, Ds2 and Cs2 is respectively the parasitic diode and parasitic capacitance of auxiliary switch 42.
The main switch 32 is full-control type semiconductor switch with auxiliary switch 42；
Preferably, main switch 32 and auxiliary switch 42 are metal-oxide-semiconductor shown in Fig. 3；
Preferably, main switch 32 and auxiliary switch 42 are IGBT；
Preferably, main switch 32 and auxiliary switch 42 are SiC metal-oxide-semiconductors or GaN metal-oxide-semiconductors；
Preferably, booster diode 43 is Schottky diode.
Fig. 4 show the groundwork mode in the switch course of work of the embodiment of the present invention 1, and Fig. 5 show of the invention real
The main waveform in the switch course of work of example 1 is applied, operation mode is now compareed and work wave is described briefly.
Mode1 (t0~t1)：T0 moment, auxiliary switch 42 are off cut-off state, and main switch 32 is from conducting shape
State is switched to shutdown cut-off state, because inductive current cannot be mutated, it is believed that 41 electric current of resonant inductance is constant in the short time, and boosting
An electric current part for inductance 31 leads to Vds1 rapid increases to the hourglass source electrode junction capacity Cs1 chargings of the main switch 32；It is another
Portion of electrical current gives the auxiliary switch 42 hourglass source electrode junction capacity Cs2 electric discharges, and Vds2 is caused to rapidly drop to 0；
Mode2 (t1~t2)：At the t1 moment, 42 hourglass source electrode junction capacity Cs2 of the auxiliary switch is discharged into 0V, described auxiliary
42 body diode Ds2 conductings of switching tube, a part for the electric current of the boost inductance 31 is helped to continue to the main switch 32
The Cs1 chargings of hourglass source electrode junction capacity, another part give the resonant capacitance 44 by the body diode Ds2 of the auxiliary switch 42
(Cr) it charges, meanwhile, the voltage VCr of the resonant capacitance 44 is added in 41 both ends of the resonant inductance and gives resonant inductance excitation,
That is it is humorous with the resonant inductance 41 after the hourglass source electrode junction capacity Cs1 of the main switch 32 is in parallel with the resonant capacitance 44 (Cr)
It shakes；
Mode3 (t2~t3)：T2 moment, the conducting of 42 no-voltage of the auxiliary switch do not influence ongoing at this time
The electric current of resonant process, t3 moment, (Cr) voltage resonance of the resonant capacitance 44 to 0V, the resonant inductance 41 reaches maximum
Value；
Mode4 (t3~t4)：In time period, booster diode 43 is connected, and the electric current of the resonant inductance 41 passes through institute
It states booster diode 43 and 42 afterflow of auxiliary switch and keeps being basically unchanged；
Mode5 (t4~t5)：T4 moment, auxiliary switch 42 turn off, and a part for the electric current of resonant inductance 41 is to described
42 hourglass source electrode junction capacity Cs2 chargings of auxiliary switch, another part are put to the hourglass source electrode junction capacity Cs1 of the main switch 32
After the hourglass source electrode junction capacity Cs1 of electricity namely the main switch 32 is in parallel with 42 hourglass source electrode junction capacity Cs2 of the auxiliary switch
With 41 resonance of the resonant inductance；
Mode6 (t5~t6)：T5 moment, 42 drain-source voltage Vds2 of auxiliary switch rise to Vout, main switch 32
Drain-source extreme pressure Vds1 be reduced to 0V, the body diode Ds1 conductings of the main switch 32, the voltage for being added in the both ends Lr is-
Vout, iLr linearly reduce, and it is Vin to be added in Lp both end voltages, and iLp is linearly increasing；
Mode7 (t6~t7) t6 moment, the conducting of 32 no-voltage of main switch do not influence the course of work before this, and iLr continues
Linear to reduce, iLp continuation is linearly increasing, until iLp>When iLr, flowing through the electric current of main switch 32 becomes positive current；
Mode8 (t7~t8)：The electric current at t7 moment, resonant inductance 41 is linearly reduced to 0, and 33 zero current of rectifier diode closes
It is disconnected, 42 hourglass source electrode junction capacity Cs2 of auxiliary switch connect with resonant capacitance 44 (Cr) after with Lr resonance, t8 moment, the auxiliary
For 42 drain-source voltage Vds2 resonance of switching tube to 0V, 41 electric current of resonant inductance reaches negative minimum value；
Mode9 (t8~t9)：T8 moment, 42 body diode Ds2 conductings of auxiliary switch, resonant capacitance 44 (Cr) are gone here and there with Lr
Join resonance, at the t9 moment, for the current resonance of the resonant inductance 41 to 0, resonant capacitor voltage reaches one with respect to stationary value
Value；
Mode10 (t9~t10)：Lr will be with auxiliary switch 42 after resonant capacitor voltage reaches a metastable value
Hourglass source electrode junction capacity Cs2 resonance by a small margin, is ignored herein without appearing in exemplary operation waveform；The t10 moment,
Main switch 32 is switched to shutdown cut-off state from conducting state again, starts another cyclic process.
Second embodiment
Fig. 8-1 shows schematic diagram and control block diagram according to the second embodiment of the present invention, is different from the first embodiment
, between the source electrode and control circuit of main switch 32, increase a CS current detection circuit.
This embodiment is mainly reflected in underloading control, the stabilization of sampling and outputting voltage Vout control output voltages, sampling
Main switch peak point current realizes underloading control.When the load decreases, main switch peak point current reduces, when load is reduced to
Circuit enters the work of DCM patterns when to a certain degree.This minimum is kept from control when peak point current reduces to a certain extent
Peak point current no longer reduces, i.e. minimum peak current control, that is to say, that passes through the work of reduction switching tube when load continues to reduce
Working frequency carrys out the output of stabilization transform device, and then enters Burst operating modes when working frequency reaches minimum frequency of operation, should
Still the ZVS that main switch and auxiliary switch pipe are realized when control can guarantee while underloading frequency reducing, is conducive to the light of hoisting module
Carry efficiency.Fig. 8-2 show corresponding FREQUENCY CONTROL change curve schematic diagram.
3rd embodiment
Fig. 9 shows the schematic diagram of 3rd embodiment according to the present invention, that is to say, that zero voltage switch electricity of the invention
Road 40 is equally applicable to the Boost circuit of synchronous rectification, with embodiment 1 difference lies in rectifier diode 33 changed into it is synchronous whole
Flow switching tube 81, the input terminal of the zero voltage switch circuit 40 is connected with the drain electrode of main switch 32, output end with it is synchronous whole
The source electrode for flowing switching tube 81 is connected, and the anode of the drain electrode connection output filter capacitor 34 of synchronous rectification switch pipe 81.In addition originally
Embodiment also includes control circuit 86, and control circuit 86 exports three road drive signals to control main switch 32, auxiliary switch
42 and synchronous rectification switch pipe 81 switch, wherein main switch 32 and 42 complementary drive of auxiliary switch, auxiliary switch
42 drivings synchronous with synchronous rectification switch pipe 81.
The operation principle of the present embodiment is referred to the operation principle of embodiment 1, is no longer described in detail herein.It illustrates
Be when 31 electric current consecutive hours of Boost boost inductances (electric current not zero passage) can also realize main switch and synchronous rectification switch pipe
No-voltage is open-minded, and when Boost 31 discontinuous currents of boost inductance (current over-zero), boost inductance will be in the effect of output voltage
Lower negative sense excitation and generate negative current, the boost inductance when auxiliary switch and synchronous rectification switch pipe turn off in the case
The electric current of negative sense exciting current and resonant inductance extracts the hourglass source electrode junction capacity charge of main switch 32 by acting on simultaneously, thus
This has no effect on the realization of zero level pressure of main switch.
Fourth embodiment
Figure 10 shows the schematic diagram of fourth embodiment according to the present invention, this embodiment and embodiment 1 difference lies in
The booster diode 43 in parallel with resonant capacitance is lacked, has equally taken complementary drive control, when Boost boost inductor currents are continuous
When, this embodiment is consistent with 1 operation principle of embodiment, and the no-voltage that main switch and auxiliary switch pipe equally may be implemented is open-minded,
Here it no longer elaborates.
Disclosed above is only specific embodiments of the present invention, but the present invention is not limited to this, any this field
Several modifications that technical staff carries out the present invention under the premise of without departing from core of the invention thought should be fallen in this hair
Bright scope of the claims etc.
Claims (11)
1. a kind of zero voltage switch Boost circuit, including boost inductance 31, main switch 32, rectifier diode 33, output filtering
Capacitance 34 and control circuit 36, it is characterised in that：It also include zero voltage switch circuit 40；
One end connection input voltage of boost inductance 31+, the drain electrode of the other end connection main switch 32 of boost inductance 31, master opens
The source electrode for closing pipe 32 connects input voltage-, the output end all the way of the grid connection control circuit of main switch 32；Output filtering
The both ends output voltage Vout of capacitance 34 powers to successive load；The control circuit 36 generates feedback according to output voltage Vout
Voltage signal and the duty ratio that main switch 32 is adjusted according to feedback voltage signal；The input terminal of the zero voltage switch circuit 40
It is connected with the other end of boost inductance 31, the anode of the output end and the rectifier diode 33 of the zero voltage switch circuit 40
It is connected, the control terminal of the zero voltage switch circuit 40 is connected with the another way output end of control circuit；The rectifier diode
The anode of 33 cathode connection output filter capacitor 34.
2. a kind of zero voltage switch Boost circuit according to claim 1, it is characterised in that：It further include a CS electric current
Detection circuit, the source electrode of the input terminal connection main switch 32 of the CS current detection circuits, for detecting main switch 32
The electric current of source electrode；The output end of the CS current detection circuits connects control circuit.
3. a kind of zero voltage switch Boost circuit according to claim 1 or 2, it is characterised in that：The no-voltage is opened
Powered-down road 40 includes resonant inductance 41, auxiliary switch 42, resonant capacitance 44, and one end of resonant inductance 41 is as zero voltage switch
The input terminal of circuit 40, the output end of the other end of resonant inductance 41 as zero voltage switch circuit 40；Auxiliary switch 42
Source electrode connects one end of resonant inductance 41, and the drain electrode of auxiliary switch 42 connects the anode of resonant capacitance 44, resonant capacitance 44
Cathode connects the other end of resonant inductance 41；Control terminal of the grid of auxiliary switch 42 as zero voltage switch circuit 40.
4. a kind of zero voltage switch Boost circuit according to claim 3, it is characterised in that：The zero voltage switch electricity
Road 40 further includes booster diode 43, and the cathode of booster diode 43 connects the anode of resonant capacitance 44, booster diode 43
Anode connects the cathode of resonant capacitance 44.
5. a kind of zero voltage switch Boost circuit according to claim 4, it is characterised in that：Control circuit is to main switch
Pipe 32 and the control of auxiliary switch 42 control for complementary drive.
6. a kind of zero voltage switch Boost circuit according to claim 5, it is characterised in that：Main switch 32 and auxiliary
Switching tube 42 is metal-oxide-semiconductor or IGBT, and the booster diode 43 is Schottky diode.
7. a kind of control method of zero voltage switch Boost circuit, it is characterised in that：
CS current detection circuits detect the peak point current of main switch 32, when the peak point current is reduced to the reference value of setting
It keeps this minimum peak electric current no longer to reduce from control, main switch is caused when input voltage increases or load to continue to reduce
When 32 peak point current of pipe has the tendency that continuing to reduce, stablize Boost circuit by reducing the working frequency of main switch 32
Output；And then enters frequency hopping when the working frequency of main switch 32 reaches minimum frequency of operation and work.
8. a kind of synchronous rectification Boost circuit of zero voltage switch, including boost inductance 31, main switch 32, output filtered electrical
Hold 34, synchronous rectification switch pipe 81, it is characterised in that：It also include zero voltage switch circuit 40；
One end connection input voltage of boost inductance 31+, the drain electrode of the other end connection main switch 32 of boost inductance 31, master opens
The source electrode for closing pipe 32 connects input voltage-, the output end all the way of the grid connection control circuit of main switch 32；Output filtering
The both ends output voltage Vout of capacitance 34 powers to successive load；The control circuit 36 generates feedback according to output voltage Vout
Voltage signal and the duty ratio that main switch 32 is adjusted according to feedback voltage signal；The input terminal of the zero voltage switch circuit 40
It is connected with the drain electrode of main switch 32, the output end of the zero voltage switch circuit 40 and the source electrode phase of synchronous rectification switch pipe 81
Even, the control terminal of the zero voltage switch circuit 40 is connected with the another way output end of control circuit；The synchronous rectification switch
The anode of the drain electrode connection output filter capacitor 34 of pipe 81, the third of the grid and control circuit of the synchronous rectification switch pipe 81
Road output end is connected.
9. a kind of zero voltage switch Boost circuit according to claim 8, it is characterised in that：The zero voltage switch
Circuit 40 includes resonant inductance 41, auxiliary switch 42, resonant capacitance 44, and one end of resonant inductance 41 is as zero voltage switch electricity
The input terminal on road 40, the output end of the other end of resonant inductance 41 as zero voltage switch circuit 40；The source of auxiliary switch 42
Pole connects one end of resonant inductance 41, the anode of the drain electrode connection resonant capacitance 44 of auxiliary switch 42, and resonant capacitance 44 is born
Pole connects the other end of resonant inductance 41；Control terminal of the grid of auxiliary switch 42 as zero voltage switch circuit 40.
10. a kind of zero voltage switch Boost circuit according to claim 9, it is characterised in that：Main switch 32 and auxiliary
42 complementary drive of switching tube, the driving synchronous with synchronous rectification switch pipe 81 of auxiliary switch 42.
11. a kind of zero voltage switch Boost circuit according to claim 10, it is characterised in that：The no-voltage is opened
Powered-down road 40 further includes booster diode 43, the anode of the cathode connection resonant capacitance 44 of booster diode 43, booster diode
The cathode of 43 anode connection resonant capacitance 44.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810294727.3A CN108390567B (en) | 2018-04-04 | 2018-04-04 | Zero-voltage switch Boost circuit and control method thereof |
| PCT/CN2019/070642 WO2019192234A1 (en) | 2018-04-04 | 2019-01-07 | Zero voltage switching boost circuit and control method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810294727.3A CN108390567B (en) | 2018-04-04 | 2018-04-04 | Zero-voltage switch Boost circuit and control method thereof |
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| CN108390567B CN108390567B (en) | 2020-07-17 |
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| CN108768365A (en) * | 2018-08-20 | 2018-11-06 | 珠海格力电器股份有限公司 | Change-over switch conversion and control circuit |
| CN109768705A (en) * | 2019-01-30 | 2019-05-17 | 钰泰半导体南通有限公司 | A kind of control method for realizing low quiescent current in switch buck converter |
| WO2019192234A1 (en) * | 2018-04-04 | 2019-10-10 | 广州金升阳科技有限公司 | Zero voltage switching boost circuit and control method therefor |
| WO2020093872A1 (en) * | 2018-11-07 | 2020-05-14 | 广州金升阳科技有限公司 | Zero-voltage pfc converter |
| CN113098256A (en) * | 2021-03-11 | 2021-07-09 | 深圳市博茂智信科技有限公司 | Power factor correction circuit and method for realizing soft switching |
| CN113131735A (en) * | 2021-02-05 | 2021-07-16 | 华源智信半导体(深圳)有限公司 | PFC circuit and control method thereof |
| CN113890314A (en) * | 2021-09-28 | 2022-01-04 | 力源科技有限公司 | Control method of switching power supply and switching power supply |
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| CN113098256B (en) * | 2021-03-11 | 2023-02-24 | 深圳市博茂智信科技有限公司 | Power factor correction circuit and method for realizing soft switching |
| CN113890314A (en) * | 2021-09-28 | 2022-01-04 | 力源科技有限公司 | Control method of switching power supply and switching power supply |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019192234A1 (en) | 2019-10-10 |
| CN108390567B (en) | 2020-07-17 |
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