CN108448902A - A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment and control method - Google Patents
A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment and control method Download PDFInfo
- Publication number
- CN108448902A CN108448902A CN201810361374.4A CN201810361374A CN108448902A CN 108448902 A CN108448902 A CN 108448902A CN 201810361374 A CN201810361374 A CN 201810361374A CN 108448902 A CN108448902 A CN 108448902A
- Authority
- CN
- China
- Prior art keywords
- transformer
- primary side
- side power
- circuit
- synchronous rectification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 191
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 title claims description 32
- 238000004804 winding Methods 0.000 claims abstract description 92
- 230000005284 excitation Effects 0.000 claims abstract description 17
- 239000004065 semiconductor Substances 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 8
- 230000005669 field effect Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 230000000750 progressive effect Effects 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 13
- 230000007423 decrease Effects 0.000 description 6
- 101100102849 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) VTH1 gene Proteins 0.000 description 2
- 101150088150 VTH2 gene Proteins 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of synchronous rectification inverse-excitation type DC DC power supply change-over device and control method, the present invention includes circuit of reversed excitation and auxiliary switch；Circuit of reversed excitation includes an input port, an output circuit and a transformer；The input port receives DC input voitage, gives transformer-supplied, primary side power switch tube and the transformer primary side power windings in series；The secondary side power winding coupled of output circuit and the transformer, the energy that the transformer is discharged during the primary side power switch tube turns off generate a direct current in the output port, are supplied to load；The auxiliary switch is in parallel with the auxiliary winding of transformer.The present invention can utilize the secondary side synchronous rectification control technology of the prior art to realize that the synchronous rectification inverse-excitation type DC to DC converter without common risk, compatible discontinuous conduct mode, electric current critical discontinuous mode and continuous current mode, the drive signal generation logic circuit of auxiliary switch are simple.
Description
Technical field
The invention patent relates to a kind of DC-DC power conversion equipment, it is particularly suitable for that electric current is continuous, discontinuously or faces
Boundary discontinuously etc. various operating modes the inverse-excitation type DC-DC power conversion equipment with synchronous rectification.
Background technology
DC/DC conversion is most basic one of transformation of electrical energy form.Flyback converter is since its topology is simple, first device
The features such as part is few, is widely used in small-power switching power-supply, usually in 100~200W or less.The loss of flyback converter
Main loss, transformer loss, the loss of absorbing circuit and the loss of secondary side rectifier including primary side switch pipe.Wherein,
The loss of output end rectifier is one of dominant loss of inverse excitation type converter, whole in the output of low-voltage, high current
The proportion that the loss of flow tube accounts for is especially prominent.
In order to reduce the loss of rectifying tube, a kind of main means are synchronous rectifications.Fig. 1 show one kind and uses
The inverse-excitation type DC-DC power conversion equipment of synchronous rectification, shown in synchronous commutating control circuit 100 be it is a kind of most
The simplified pinciple figure of the synchronous commutating control circuit of the common prior art.
As shown in Figure 1, when the Q1 shutdowns of primary side power switch tube, energy is transferred to secondary side from the primary side of transformer T, synchronizes whole
Flow tube QSRBody diode be connected afterflow, synchronous rectifier QSRDrain electrode VD become negative pressure.When VD voltages are less than reference voltage
When VTH1,101 output switching activity of comparator makes 103 set of trigger, the output of trigger 103 after the driving of driving circuit 104,
The control signal Vg_SR of output synchronous rectifier, control synchronous rectifier QSRConducting.Synchronous rectifier QSRConducting can be significantly
The conduction voltage drop for reducing output rectifier reaches reduction loss, puies forward efficient purpose.As freewheel current reduces, VD voltages
It increases, when VD voltages are higher than reference voltage V TH2,102 output switching activity of comparator makes trigger 103 reset, and control synchronizes whole
Flow tube Q2 shutdowns.In addition, being also added into minimum turn-on time circuit 107 and/or door 108 in synchronous commutating control circuit 100
To prevent the oscillation of VD waveforms from leading to synchronous rectifier QSRControl signal Vg_SR when opening accidentally turn off, separately add
Minimum turn-off time circuit 105 and with door 106 a minimum turn-off time is arranged, avoid synchronous rectifier QSRIt weighs after shut-off
It is new open-minded.
Using synchronous rectification control mode shown in Fig. 1, due to detecting that VD reaches benchmark from synchronous commutating control circuit 100
Voltage is to synchronous rectifier control signal overturning, and control circuit has inevitably delay, including synchronous rectifier is open-minded
Be delayed Td1 and shutdown delay Td2, as shown in Figures 2 and 3.Wherein Fig. 2 show flyback converter shown in Fig. 1 and is operated in electric current
Main waveform when discontinuous mode or critical discontinuous mode, Fig. 3 show flyback converter shown in Fig. 1 and are operated in the electric current progressive die
Main waveform when formula.
By Fig. 2 it can be seen that, when VD voltages reach benchmark VTH2, the synchronous rectifier Q after the Td2 that is delayedSRControl
It is low level, synchronous rectifier Q that signal Vg_SR is overturn from high levelSRShutdown, body diode flow through secondary current.Due to anti-
When exciting converter is operated in discontinuous conduct mode or critical discontinuous mode, secondary current descending slope is smaller, therefore synchronous rectification
Pipe QSRTurn-off time can control before secondary current zero crossing, therefore synchronous rectifier Q will not occurSRWith primary side work(
Rate switching tube Q1's is common.
As shown in figure 3, under continuous current mode, it is open-minded in t3 moment primary side power switch tubes Q1, flow through synchronous rectification
Pipe QSRElectric current start to decline rapidly with larger slope, corresponding VD voltages are begun to ramp up；At the t4 moment, VD voltages reach benchmark
VTH2, using the t5 timing synchronization rectifying tubes Q after delay Td2SRJust turn off.It can be seen that in this section of section t3 to t5,
Primary side power switch tube Q1 and synchronous rectifier QSRIt is at common state, therefore will produce larger common electric current, is made
Flyback converter operation irregularity, or even circuit is caused to damage.
Therefore, existing synchronous rectification control technology shown in FIG. 1 is only applicable to flyback converter and is operated in discontinuous current
Pattern or critical discontinuous mode have larger limitation.And under many applicable cases or operating condition, in order to optimize device effect
Rate, it may be desirable to design flyback converter and enter continuous current mode.
For the flyback converter of continuous current mode, a kind of existing solution is will be former using optocoupler or magnetic cell
The signal transmission of side switching tube is used to control secondary synchronous rectifier later to transformer secondary, then through certain logical process.
But due to transmission be high-frequency pulse signal, optocoupler will use expensive high speed photo coupling, and magnetic cell price higher, because
The method of this this isolation transmission synchronous rectifier control signal is in industrial quarters using relatively fewer.
Invention content
In order to solve problem above, the present invention provides a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipments
And control method.
A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment, including：Circuit of reversed excitation and auxiliary switch；Flyback
Circuit includes an input circuit, an output circuit and a transformer；The input circuit includes primary side power switch
Pipe receives DC input voitage to transformer-supplied, primary side power switch tube and the transformer primary side power windings in series；It is defeated
The secondary side power winding coupled for going out circuit and the transformer, by the transformer during the primary side power switch tube turns off
The energy of release generates a direct current in the output port of the output circuit, is supplied to load；The auxiliary switch and change
The auxiliary winding of depressor is in parallel.
Preferably, the DC input voitage of the input circuit is the direct current that the DC power supplies such as accumulator directly export
Pressure or the DC voltage of other conversion circuits output, the DC input voitage are that the alternating voltage of power grid is whole by diode
The constant DC voltage or sinusoidal half-wave voltage of current circuit output.
Preferably, transformer primary side power winding one termination DC input voitage anode, transformer primary side power around
The other end of group is connect with the drain electrode of primary side power switch tube, and the source electrode of primary side power switch tube connects DC input voitage cathode,
The drain electrode at one end of transformer secondary power winding and the ends VD of synchronous commutating control circuit, secondary synchronous rectifier connects, secondary
The grid of synchronous rectifier and the ends VG of synchronous commutating control circuit connect, the other end and the electricity of transformer secondary power winding
Hold one end of Co, one end connection of load, the source electrode company of the other end of capacitance Co and the other end of load, secondary synchronous rectifier
It connects；The auxiliary switch is in parallel with the auxiliary winding of transformer.
Preferably, the source electrode of a termination primary side power switch tube of transformer primary side power winding, primary side power switch
The drain electrode of pipe connects DC input voitage anode, and the cathode of another termination DC input voitage of transformer primary side power winding becomes
The drain electrode at one end of depressor pair side power winding and the ends VD of synchronous commutating control circuit, secondary synchronous rectifier connects, secondary side
The grid of synchronous rectifier and the ends VG of synchronous commutating control circuit connect, the other end and capacitance of transformer secondary power winding
The source electrode of one end of Co, one end connection of load, the other end of capacitance Co and the other end of load, secondary synchronous rectifier connects
It connects；The auxiliary switch is in parallel with the auxiliary winding of transformer.
Preferably, the auxiliary switch is the semiconductor devices with two-way blocking-up ability.
Preferably, the auxiliary switch is diode and what metal oxide semiconductor field effect tube was constituted compound opens
It closes, the direction of diode is opposite with the direction of metal oxide semiconductor field effect tube body diode.
Preferably, the auxiliary switch is answering for the metal oxide semiconductor field effect tube composition of two differential concatenations
Combination switch.
Preferably, the time of the auxiliary switch conducting is fixed or by synchronous rectification inverse-excitation type DC-DC electricity
The control circuit of supply changeover device is adjusted according to the working condition of circuit.
Preferably, the excitation current of the transformer is operated in on-off state, continuous state or critical discontinuous state.
A kind of control method of synchronous rectification inverse-excitation type DC-DC power conversion equipment, which is characterized in that this method has
Body includes the following steps：
Step 1：Synchronous rectification inverse-excitation type DC-DC power conversion equipment generates the control of primary side power switch tube respectively
The control signal of signal and auxiliary switch；
Step 2：Auxiliary switch is connected once or twice before primary side power switch tube is opened so that being led in auxiliary switch
Transformer primary side power winding is short-circuited in the logical time；
Step 3：Synchronous commutating control circuit generates synchronous rectifier according to the voltage signal at secondary synchronous rectifier both ends
Control signal.
Preferably, auxiliary switch is operated in electric current in the synchronous rectification inverse-excitation type DC-DC power conversion equipment
When continuous mode, be connected once or twice before primary side power switch tube is opened；Auxiliary switch is in the synchronous rectification flyback
When formula DC-DC power conversion equipment is operated in discontinuous conduct mode or electric current critical discontinuous mode, in primary side power switch
Pipe be connected before opening it is primary, twice or be not turned on.
The principle of the present invention is：For synchronous rectification inverse-excitation type DC-to-dc converter, when to be operated in electric current continuous for it
Under state, secondary current just declines after being opened due to primary side power switch tube, for conventional detection secondary synchronous rectifier
The negative pressure of both end voltage reaches the amplitude of certain threshold value to turn off the control mode of synchronous rectifier, inevitably exists common
The problem of.Synchronous rectification inverse-excitation type DC-DC power conversion equipment proposed by the present invention in primary side power switch tube by opening
Using being connected with the auxiliary switch of transformer auxiliary winding parallel connection before logical, by all winding voltage clamps of transformer in zero electricity
It is flat, it is corresponding so that secondary synchronous rectifier both end voltage is equal to output voltage, to be closed before primary side power switch tube is opened
Disconnected secondary synchronous rectifier eliminates primary side power switch tube and the common possibility of secondary synchronous rectifier.And it is whole when synchronizing
Stream inverse-excitation type DC-to-dc converter is operated under discontinuous conduct mode or electric current critical discontinuous mode, due to conventional detection
The control mode of the negative pressure of secondary synchronous rectifier both end voltage can in advance close before primary side power switch tube is opened
Disconnected secondary synchronous rectifier, therefore apparatus and method of the present invention is still applicable in.
Circuit structure of the present invention and its implementation, there is clear advantage compared with the existing technology；It only need to be
The low pressure auxiliary switch of transformer auxiliary winding both ends parallel connection small-power, low cost, you can synchronized using the secondary side of the prior art
Rectification control technology is realized without common risk, compatible discontinuous conduct mode, electric current critical discontinuous mode and continuous current mode
The drive signal generation logic circuit of synchronous rectification inverse-excitation type DC-to-dc converter, auxiliary switch is simple.Further, it assists
The control circuit of switch and its drive signal generation circuit and conventional flyback converter is desirably integrated among same chip,
Further decrease installation cost.
Description of the drawings
Fig. 1 shows that a kind of synchronous rectification inverse-excitation type DC-DC of the synchronous commutating control circuit using the prior art turns
Parallel operation；
Fig. 2 shows circuits shown in Fig. 1 to be operated in the key waveforms under discontinuous conduct mode；
Fig. 3 shows the key waveforms that circuit shown in Fig. 1 is operated under continuous current mode；
Fig. 4 shows synchronous rectification inverse-excitation type DC-to-dc converter the first specific embodiment schematic diagram of the present invention；
Fig. 5 shows that the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention uses first
Kind auxiliary switch control mode is operated in the specific waveform under continuous current mode；
Fig. 6 shows that the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention uses first
Kind auxiliary switch control mode is operated in the specific waveform under discontinuous conduct mode；
Fig. 7 shows that the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention uses second
Kind auxiliary switch control mode is operated in the specific waveform under continuous current mode；
Fig. 8 shows that the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention uses third
Kind auxiliary switch control mode is operated in the specific waveform under continuous current mode；
Fig. 9 shows the second specific embodiment schematic diagram of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention；
Figure 10 shows the specific embodiment of the auxiliary switch of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention.
Specific implementation mode
The present invention is described in detail below in conjunction with attached drawing.Pass through the description to the specific embodiment of the invention, Ke Yigeng
Add the feature and details that should be readily appreciated that the present invention.Well known embodiment and operational means not detailed herein, so as not to it is mixed
The various implementer's cases for the present invention of confusing still to those skilled in the art, it is specific to lack one or more
Details or component do not influence the understanding of the present invention and implementation.
" embodiment " or " one embodiment " described in this specification refers to being described in conjunction with the embodiments included in this hair
Specific features, structure, embodiment and feature in bright at least one embodiment.Therefore, it is mentioned in specification different places
When " in one embodiment ", not necessarily referring to the same embodiment.These features, structure or characteristic can be with any suitable
Mode combines in one or more embodiments.
Fig. 4 is the circuit signal of the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention
Figure, the synchronous rectification inverse-excitation type DC-to-dc converter include circuit of reversed excitation 200 and auxiliary switch Qa, further, described same
It further includes synchronous commutating control circuit 100 to walk rectification inverse-excitation type DC-to-dc converter.
Wherein, the circuit of reversed excitation 200 includes：
Input circuit, including primary side power switch tube Q1 receive DC input voitage Vin；Two of the input circuit
Input terminal is separately connected the source electrode of the Same Name of Ends and primary side power tube Q1 of the primary side power winding Wp of transformer T, the original of transformer T
The anode of the termination DC input voitage Vin of the same name of side power winding Wp, the source electrode of primary side power tube Q1 connect DC input voitage
The negative terminal of Vin, the drain electrode of primary side power switch tube Q1 connect the different name end of transformer T primary side power windings Wp, primary side power switch
The grid of pipe Q1 receives control signal Vg1；
Transformer T includes at least a primary side power winding Wp, a pair side power winding Ws and an auxiliary winding
Wa；
Output circuit, including secondary synchronous rectifier QSRWith output capacitance Co, the secondary side power winding Ws of the transformer T
Different name termination output capacitance Co anode, the secondary synchronous rectification in the termination pair of the same name of power winding Ws of the transformer T
Pipe QSRDrain electrode, the secondary synchronous rectifier QSRSource electrode meet the cathode of output capacitance Co, the secondary synchronous rectifier QSR
Grid receive control signal Vg_SR.
The auxiliary switch Qa is in parallel with the auxiliary winding Wa of transformer T, a termination transformer T of the auxiliary switch Qa
Auxiliary winding Wa different name end, the Same Name of Ends of the auxiliary winding Wa of another termination transformer T of the auxiliary switch Qa is described
The control terminal of auxiliary switch Qa receives control signal Vga.
The ends the VD secondary synchronous rectifier Q of the synchronous commutating control circuit 100SRDrain electrode, the secondary side of GND terminations synchronizes whole
Flow tube QSRSource electrode, VG terminates secondary synchronous rectifier QSRGrid.
For the convenience of description, the number of turns and pair side power winding Ws that the turn ratio n for defining transformer T is primary side power winding Wp
The ratio between the number of turns, be also in this way, no longer individually definition in the other embodiments of this specification.
It is operated in the with reference to the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention of figure 5
A kind of synchronous rectification of specific waveform and the prior art shown in FIG. 1 under the continuous current mode of auxiliary switch control mode
Control circuit 100：
At the t1 moment, primary side power switch tube Q1 shutdowns, the energy transfer being stored in transformer T arrives output loop, original
Side electric current Ip declines, and secondary current Is rises, secondary synchronous rectifier QSRBody diode be conducted through secondary current Is so that
Secondary synchronous rectifier QSRThe voltage Vds_QSR at both ends is equal to the pressure drop of negative body diode.Synchronous rectification according to figure 1
The operation principle of control circuit 100 is it is found that due to secondary synchronous rectifier QSRBody diode pressure drop less than synchronous rectification control
The internal reference voltage VTH1 of circuit 100,101 output switching activity of comparator make 103 set of trigger, the output warp of trigger 103
Driving circuit 104 sends secondary synchronous rectifier Q toSRGrid.Considering 100 internal logic circuit of synchronous commutating control circuit
At the t2 moment after the delay Td1 of generation, it is high level, control that secondary synchronous rectifier, which controls signal Vg_SR by low level overturning,
Secondary synchronous rectifier Q processedSRConducting.In secondary synchronous rectifier QSRIt is secondary as secondary current Is electric currents decline during conducting
Synchronous rectifier QSRThe voltage Vds_SR at both ends rises, but since circuit is operated in electric current continuous state, Vds_SR is not up to
To reference voltage V TH2；
At the t3 moment, the control signal Vga of auxiliary switch Qa is high level, and control auxiliary switch Qa is connected, transformer T's
Auxiliary winding Wa is by Qa short circuits, since each windings of transformer T intercouple, the primary side power winding Wp of transformer T and secondary side work(
Rate winding Ws both end voltages are also zero or are approximately zero, secondary synchronous rectifier QSRThe voltage Vds_SR at both ends is also accordingly equal to defeated
Go out voltage Vo, to be higher than reference voltage V TH2,102 output switching activity of comparator, make trigger 103 reset, trigger 103 it is defeated
Go out and sends secondary synchronous rectifier Q to through driving circuit 104SRGrid.Considering 100 internal logic of synchronous commutating control circuit
At the t4 moment after the delay Td2 that circuit generates, it is low electricity that secondary synchronous rectifier, which controls signal Vg_SR by high level overturning,
It is flat, control secondary synchronous rectifier QSRShutdown, meanwhile, the energy transfer stored in transformer T to auxiliary winding Wa, and through assist
Switch Qa constitutes circulation loop；
At the t5 moment, it is low level that the control signal Vga of auxiliary switch Qa is overturn by high level, and auxiliary switch Qa is turned off,
The short-circuit effect of each winding of transformer T releases；In the same time or pass through after a bit of delay, primary side power switch tube Q1's
Grid signal is high level, primary side power switch tube Q1 conductings, in the auxiliary winding Wa and auxiliary of transformer T by low level overturning
The energy transfer of switch Qa cycle is to transformer primary side power winding Wp so that primary current Ip generates certain initial value；In original
During side power switch tube Q1 is connected, transformer T is given at the primary side power both ends winding Wp that DC input voitage V1 is added in transformer T
Magnetizing inductance excitation, primary current Ip begins to ramp up.
By analyzing above as it can be seen that under continuous current mode, synchronous rectification inverse-excitation type DC-DC electricity proposed by the present invention
Supply changeover device has turned off secondary synchronous rectifier in advance before primary side power switch tube is opened, and eliminates primary side power switch
Pipe and the common possibility of secondary synchronous rectifier, transformer primary side not will produce common electric current, but synchronous rectification control is electric
The delay Td2 on road 100 causes the common section of a length of Td2 in the presence of secondary synchronous rectifier QSR and auxiliary switch Qa, in this phase
Between, transformer secondary side current Is, which is also possible that, can be declined to become negative value, increase circuit loss.But relatively traditional synchronous rectification
Inverse-excitation type DC-DC power conversion equipment, due to common, the circuit that eliminates primary side power switch tube and secondary synchronous rectifier
Loss substantially reduces, and the not risk of component damage.
First is used with reference to the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of 6 present invention of figure
Synchronizing for specific waveform that kind of auxiliary switch control mode is operated under discontinuous conduct mode and the prior art shown in FIG. 1 is whole
Flow control circuit 100：
At the t1 moment, primary side power switch tube Q1 shutdowns, the energy transfer being stored in transformer T arrives output loop, original
Side electric current Ip declines, and secondary current Is rises, secondary synchronous rectifier QSRBody diode be conducted through secondary current Is so that
Secondary synchronous rectifier QSRThe voltage Vds_QSR at both ends is equal to the pressure drop of negative body diode.Synchronous rectification according to figure 1
The operation principle of control circuit 100 is it is found that due to secondary synchronous rectifier QSRBody diode pressure drop less than synchronous rectification control
The internal reference voltage VTH1 of circuit 100,101 output switching activity of comparator make 103 set of trigger, the output warp of trigger 103
Driving circuit 104 sends secondary synchronous rectifier Q toSRGrid.Considering 100 internal logic circuit of synchronous commutating control circuit
At the t2 moment after the delay Td1 of generation, it is high level, control that secondary synchronous rectifier, which controls signal Vg_SR by low level overturning,
Secondary synchronous rectifier QSRConducting；As secondary synchronous rectifier QSRConducting, as secondary current Is electric currents decline, secondary side synchronizes
Rectifying tube QSRThe voltage Vds_SR at both ends rises.At the t3 moment, Vds_SR reaches reference voltage V TH2, and the output of comparator 102 is turned over
Turn, trigger 103 is made to reset, the output of trigger 103 sends secondary synchronous rectifier Q to through driving circuit 104SRGrid.
T4 moment after considering the delay Td2 of 100 internal logic circuit of synchronous commutating control circuit generation, secondary synchronous rectifier
Control signal Vg_SR by high level overturning be low level, control secondary synchronous rectifier QSRShutdown, secondary synchronous rectifier
QSRBody diode be conducted through secondary current Is；
At the t5 moment, secondary current Is drops to zero, magnetizing inductance and the both ends primary side power switch tube Q1 of transformer T
Equivalent capacity vibrates；
At the t6 moment, the control signal Vga of auxiliary switch Qa is high level, and control auxiliary switch Qa is connected, transformer T's
Auxiliary winding Wa is by Qa short circuits, since each windings of transformer T intercouple, the primary side power winding Wp of transformer T and secondary side work(
Rate winding Ws both end voltages are also zero or are approximately zero, secondary synchronous rectifier QSRThe voltage Vds_SR at both ends is also accordingly equal to defeated
Go out voltage Vo.Due to having been overturn as low level in the control signal Vg_SR of t4 moment secondary synchronous rectifiers, auxiliary is opened
Closing the action of Qa does not influence the state of Vg_SR；
At the t7 moment, it is low level, each winding of transformer T that the control signal Vga of auxiliary switch Qa is overturn by high level
Short-circuit effect release, at the t7 moment, the control signal Vg1 of primary side power switch Q1 is high level, direct current by low level overturning
Input voltage V1 is added in magnetizing inductance excitation of the primary side power both ends winding Wp to transformer T of transformer T, primary current Ip from
Zero begins to ramp up.
By analyzing above as it can be seen that under discontinuous conduct mode, auxiliary switch Qa is to secondary synchronous rectifier QSRNormal work
Make no any influence, therefore the control signal of shielding auxiliary switch Qa can also be selected under discontinuous conduct mode so that is auxiliary
Switch Qa is helped not work.
Second is used with reference to the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of 7 present invention of figure
Synchronizing for specific waveform that kind of auxiliary switch control mode is operated under continuous current mode and the prior art shown in FIG. 1 is whole
Flow control circuit 100：
At the t3 moment, the control signal Vga of auxiliary switch Qa becomes high level from low level, and control auxiliary switch Qa is led
Logical, the auxiliary winding Wa of transformer T is by Qa short circuits, since each windings of transformer T intercouple, the primary side power of transformer T around
Power winding Ws both end voltages are also zero or are approximately zero for group Wp and secondary side, and secondary current Is is begun to decline, secondary side synchronous rectification
Pipe QSRThe voltage Vds_SR at both ends is begun to ramp up equal to output voltage Vo, and to be higher than reference voltage V TH2, comparator 102 is defeated
Go out overturning, trigger 103 is made to reset, the output of trigger 103 sends secondary synchronous rectifier Q to through driving circuit 104SRGrid
Pole.At the t4 moment, the control signal Vga of auxiliary switch Qa becomes low level, the Qa shutdowns of control auxiliary switch, auxiliary from high level
The short-circuit effect of switch releases, and primary side power switch tube Q1 both end voltages rise, and secondary current Is is begun to ramp up, and secondary side synchronizes whole
Flow tube QSRMaintain conducting.In the t5 after considering the delay Td2 of 100 internal logic circuit of synchronous commutating control circuit generation
It carves, secondary synchronous rectifier QSRControl signal Vg_SR by high level overturning be low level, control secondary synchronous rectifier QSR
Shutdown, secondary synchronous rectifier QSRBody diode flow through secondary current Is, secondary synchronous rectifier QSRBoth ends pressure drop be less than
Reference voltage V TH1, but due to the effect of the minimum turn-off time module inside synchronous commutating control circuit 100, secondary side synchronizes
Rectifying tube QSRRemain on shutdown.At the t6 moment, it is high level that the grid signal of primary side power switch tube Q1 is overturn by low level,
The Q1 conductings of primary side power switch tube, secondary side energy transfer to primary side so that primary current Ip generates certain initial value；In primary side work(
During the Q1 conductings of rate switching tube, DC input voitage V1 is added in the primary side power both ends winding Wp the swashing to transformer T of transformer T
Magnetoelectricity sense excitation, primary current Ip are begun to ramp up.
Similarly, the present invention shown in Fig. 7 is operated in using second of auxiliary switch control mode under discontinuous conduct mode,
Auxiliary switch Qa is to secondary synchronous rectifier QSRThe no any influence of normal work, no longer detailed analysis here.
The present invention shown in Fig. 7 is auxiliary using the first with the present invention shown in Fig. 5 using second of auxiliary switch control mode
Switch control mode is helped to compare, since what the pulse width of auxiliary switch Qa can be arranged is less than prolonging for synchronous commutating control circuit
When Td2, therefore the common turn-on time smaller of transformer secondary and auxiliary winding circuit, to reduce circuit loss.
Third is used with reference to the first specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of 8 present invention of figure
Synchronizing for specific waveform that kind of auxiliary switch control mode is operated under continuous current mode and the prior art shown in FIG. 1 is whole
Flow control circuit 100：
At the t3 moment, the control signal Vga of auxiliary switch Qa becomes high level from low level, and control auxiliary switch Qa is led
Logical, the auxiliary winding Wa of transformer T is by Qa short circuits, since each windings of transformer T intercouple, the primary side power of transformer T around
Power winding Ws both end voltages are also zero or are approximately zero for group Wp and secondary side, and secondary current Is is begun to decline, secondary side synchronous rectification
Pipe QSRThe voltage Vds_SR at both ends is begun to ramp up equal to output voltage Vo, and to be higher than reference voltage V TH2, comparator 102 is defeated
Go out overturning, trigger 103 is made to reset, the output of trigger 103 sends secondary synchronous rectifier Q to through driving circuit 104SRGrid
Pole.At the t4 moment, the control signal Vga of auxiliary switch Qa becomes low level, the Qa shutdowns of control auxiliary switch, auxiliary from high level
The short-circuit effect of switch releases, and primary side power switch tube Q1 both end voltages rise, and secondary current Is is begun to ramp up, and secondary side synchronizes whole
Flow tube QSRMaintain conducting.In the t5 after considering the delay Td2 of 100 internal logic circuit of synchronous commutating control circuit generation
It carves, secondary synchronous rectifier QSRControl signal Vg_SR by high level overturning be low level, control secondary synchronous rectifier QSR
Shutdown, secondary synchronous rectifier QSRBody diode flow through secondary current Is, secondary synchronous rectifier QSRBoth ends pressure drop be less than
Reference voltage V TH1, but due to the effect of the minimum turn-off time module inside synchronous commutating control circuit 100, secondary side synchronizes
Rectifying tube QSRRemain on shutdown.At the t6 moment, the control signal Vga of auxiliary switch Qa becomes high level from low level again,
Auxiliary switch Qa conductings are controlled, the auxiliary winding Wa of transformer T is by Qa short circuits, since each windings of transformer T intercouple, transformation
The primary side power winding Wp of device T and secondary side power winding Ws both end voltages are also zero or are approximately zero, under secondary current Is starts
Drop, secondary synchronous rectifier QSRThe voltage Vds_SR at both ends is begun to ramp up equal to output voltage Vo, primary side power switch tube two
The voltage Vds_Q1 at end drops to equal to input voltage vin.At the t7 moment, the grid signal of primary side power switch tube Q1 is by low electricity
Flat overturning is high level, the Q1 conductings of primary side power switch tube, secondary side energy transfer to primary side so that primary current Ip generates certain
Initial value；During the Q1 conductings of primary side power switch tube, DC input voitage V1 is added in the primary side power winding Wp two of transformer T
It holds to the magnetizing inductance excitation of transformer T, primary current Ip is begun to ramp up.
Similarly, the present invention shown in Fig. 8 is operated in using the third auxiliary switch control mode under discontinuous conduct mode,
Auxiliary switch Qa is to secondary synchronous rectifier QSRThe no any influence of normal work, no longer detailed analysis here.
The present invention shown in Fig. 8 is auxiliary using second with the present invention shown in Fig. 7 using the third auxiliary switch control mode
Switch control mode is helped to compare, auxiliary switch Qa is turned on twice before primary side power switch tube is opened, and is connected at second
The voltage Vds_Q1 of period, the both ends primary side power switch tube Q1 drop to equal to input voltage vin, therefore in primary side power switch
Pipe Q1 can reduce the loss of primary side power switch tube Q1 when opening.
Fig. 9 is the circuit signal of the second specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention
Figure, the synchronous rectification inverse-excitation type DC-to-dc converter include circuit of reversed excitation 200 and auxiliary switch Qa, further, described same
It further includes synchronous commutating control circuit 100 to walk rectification inverse-excitation type DC-to-dc converter.
Wherein, the circuit of reversed excitation 200 includes：
Input circuit, including primary side power switch tube Q1 receive DC input voitage Vin；Two of the input circuit
Input terminal is separately connected the different name end of the drain electrode of primary side power switch tube Q1 and the primary side power winding Wp of transformer T, primary side work(
The drain electrode of rate switching tube Q1 connects the anode of DC input voitage Vin, and the different name of the primary side power winding Wp of transformer T terminates direct current
The negative terminal of input voltage vin, the source electrode of primary side power switch tube Q1 connect the Same Name of Ends of transformer T primary side power windings, primary side work(
The grid of rate switching tube Q1 receives control signal Vg1；
Transformer T, including primary side power winding Wp, secondary side power winding Ws and auxiliary winding Wa；
Output circuit, including secondary synchronous rectifier QSRWith output capacitance Co, the secondary side power winding Ws of the transformer T
Different name termination output capacitance Co anode, the secondary synchronous rectification in the termination pair of the same name of power winding Ws of the transformer T
Pipe QSRDrain electrode, the secondary synchronous rectifier QSRSource electrode meet the cathode of output capacitance Co, the secondary synchronous rectifier QSR
Grid receive control signal Vg_SR.
The auxiliary switch Qa is in parallel with the auxiliary winding Wa of transformer T, a termination transformer T of the auxiliary switch Qa
Auxiliary winding Wa different name end, the Same Name of Ends of the auxiliary winding Wa of another termination transformer T of the auxiliary switch Qa is described
The control terminal of auxiliary switch Qa receives control signal Vga.
The ends the VD secondary synchronous rectifier Q of the synchronous commutating control circuit 100SRDrain electrode, the secondary side of GND terminations synchronizes whole
Flow tube QSRSource electrode, VG terminates secondary synchronous rectifier QSRGrid.
Second specific embodiment of the synchronous rectification inverse-excitation type DC-to-dc converter of the present invention shown in Fig. 9 shows with Fig. 4
Synchronous rectification inverse-excitation type the first specific embodiment of DC-to-dc converter of the present invention gone out differs only in circuit of reversed excitation
The control mode of structure different from, the course of work and secondary synchronous rectifier is essentially identical, and which is not described herein again.
Several specific embodiments of auxiliary switch Qa in the present invention with reference to shown in figure 10.Auxiliary switch Qa can be single
A semiconductor devices bipolar transistor as shown in Figure 10 (a) with two-way blocking-up ability, the current collection of the bipolar transistor
Pole is connected to the different name end of the auxiliary winding Wa of transformer T, the emitter of the bipolar transistor as the ends A of auxiliary switch Qa
The ends B as auxiliary switch Qa are connected to the Same Name of Ends of the auxiliary winding Wa of transformer T, the base stage conduct of the bipolar transistor
The control terminal C of auxiliary switch Qa receives control signal Vga.
Auxiliary switch Qa may be the combination switch for multiple semiconductor devices composition that Figure 10 (b)~(c) is shown.With reference to
Figure 10 (b), the auxiliary switch Qa are the combination switches that the MOSFET Qa1 and Qa2 reversely concatenated by two is constituted.Wherein,
The source electrode of Qa1 is connected to the different name end of the auxiliary winding Wa of transformer T, the leakage of drain electrode and Qa2 as the ends A of auxiliary switch Qa
Pole connects, and the source electrode of Qa2 is connected to the Same Name of Ends of the auxiliary winding Wa of transformer T, Qa1 and Qa2 as the ends B of auxiliary switch Qa
Grid be connected with each other to receive as the control terminal C of auxiliary switch Qa and control signal Vga；With reference to figure 10 (c), the auxiliary switch
A specific embodiment of Qa is the combination switch being made of a diode Db and a MOSFET Qb.Wherein, the anode of Db
The ends A as auxiliary switch Qa are connected to the different name end of the auxiliary winding Wa of transformer T, and the drain electrode of the cathode and Qb of Db connects,
The source electrode of Qb is connected to the Same Name of Ends of the auxiliary winding Wa of transformer T as the ends B of auxiliary switch Qa, and the grid of Qb is as auxiliary
The control terminal C of switch Qa receives control signal Vga.
The above-mentioned detailed description of the embodiment of the present invention is not exhaustive or above-mentioned clear for limiting the present invention to
It is formal.It is above-mentioned the particular embodiment of the present invention and example are illustrated with schematic purpose while, those skilled in the art
It will appreciate that and carry out various equivalent modifications within the scope of the invention.
Present invention enlightenment provided here is not necessarily applied in above system, is also applied to other systems
In.The element of above-mentioned various embodiments and effect can be combined to provide more embodiments.
Can be modified to the present invention according to above-mentioned detailed description, description above describe the present invention particular implementation
No matter example and while describe anticipated optimal set pattern, hereinbefore occur how being described in detail, can also many sides
Formula implements the present invention.The details of foregoing circuit structure and its control mode can carry out considerable change in it executes details
Change, however it is still contained in the present invention disclosed herein.
It should be noted that used specific term is not when illustrating the certain features or scheme of the present invention as described above
It should be used to indicate to redefine the term herein to limit certain certain features, feature with the relevant present invention of the term
Or scheme.In short, the term that used in appended claims should not be construed to limit the invention to illustrate
Specific embodiment disclosed in book, unless above-mentioned detailed description part explicitly defines these terms.Therefore, reality of the invention
Border range includes not only the disclosed embodiments, further includes the present invention is practiced or carried out under claims all etc.
Efficacious prescriptions case.
While describing certain schemes of the present invention in the form of certain specific rights requirements below, inventor carefully examines
Many claim forms of various schemes of the invention are considered.Therefore, inventor increases appended claims after being retained in submission application
It is required that right, to related in the form of these accessory claims the present invention other schemes.
The present invention also provides the same of a kind of compatible discontinuous conduct mode, electric current critical discontinuous mode and continuous current mode sum
Walk the control method of rectification inverse-excitation type DC-DC power conversion equipment：
Step 1：Synchronous rectification inverse-excitation type DC-DC power conversion equipment generates the control of primary side power switch tube respectively
The control signal of signal and auxiliary switch；
Step 2：Auxiliary switch is connected the time once or twice before primary side power switch tube is opened and to open in auxiliary
Transformer auxiliary winding is short-circuited during closing conducting；
Step 3：Synchronous commutating control circuit generates synchronous rectifier according to the voltage signal at secondary synchronous rectifier both ends
Control signal.
Claims (11)
1. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment, it is characterised in that：Including：Circuit of reversed excitation and auxiliary
Switch；Circuit of reversed excitation includes an input circuit, an output circuit and a transformer；The input circuit includes primary side
Power switch tube, the input circuit receive DC input voitage, give transformer-supplied, primary side power switch tube and the change
Depressor primary side power windings in series；The secondary side power winding coupled of output circuit and the transformer, by the transformer in institute
It states the energy discharged during the shutdown of primary side power switch tube and generates a direct current in the output port of the output circuit, provide
To load；The auxiliary switch is in parallel with the auxiliary winding of transformer.
2. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
The DC input voitage of the input circuit is the straight of the DC voltage that directly exports of DC power supply or the output of other conversion circuits
Galvanic electricity pressure, the DC input voitage are that the alternating voltage of power grid passes through the constant DC voltage of diode rectifier circuit output
Or sinusoidal half-wave voltage.
3. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
One termination DC input voitage anode of transformer primary side power winding, the other end and the primary side work(of transformer primary side power winding
The drain electrode of rate switching tube connects, and the source electrode of primary side power switch tube connects DC input voitage cathode, transformer secondary power winding
One end and the drain electrode at the ends VD of synchronous commutating control circuit, secondary synchronous rectifier connect, the grid of secondary synchronous rectifier
It is connect with the ends VG of synchronous commutating control circuit, the other end of transformer secondary power winding and one end of capacitance Co, load
One end connects, and the source electrode of the other end of capacitance Co and the other end of load, secondary synchronous rectifier connects；The auxiliary switch with
The auxiliary winding of transformer is in parallel.
4. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
The source electrode of one termination primary side power switch tube of transformer primary side power winding, the drain electrode of primary side power switch tube connect direct current input
Positive polarity, the cathode of another termination DC input voitage of transformer primary side power winding, transformer secondary power winding
The drain electrode at one end and the ends VD of synchronous commutating control circuit, secondary synchronous rectifier connects, the grid of secondary synchronous rectifier with
The ends the VG connection of synchronous commutating control circuit, the other end of transformer secondary power winding and one end of capacitance Co, one loaded
The source electrode connection of end connection, the other end of capacitance Co and the other end of load, secondary synchronous rectifier；The auxiliary switch and change
The auxiliary winding of depressor is in parallel.
5. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
The auxiliary switch is the semiconductor devices with two-way blocking-up ability.
6. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
The auxiliary switch is the combination switch that diode is constituted with metal oxide semiconductor field effect tube, direction and the gold of diode
The direction for belonging to oxide semiconductor field effect tube body diode is opposite.
7. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
The auxiliary switch is the combination switch that the metal oxide semiconductor field effect tube of two differential concatenations is constituted.
8. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
The time of the auxiliary switch conducting is control electricity fixed or by synchronous rectification inverse-excitation type DC-DC power conversion equipment
Road is adjusted according to the working condition of circuit.
9. a kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1, it is characterised in that：
The excitation current of the transformer is operated in on-off state, continuous state or critical discontinuous state.
10. a kind of control method of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 1,
It is characterized in that, this method specifically includes following steps：
Step 1：Synchronous rectification inverse-excitation type DC-DC power conversion equipment generates the control signal of primary side power switch tube respectively
With the control signal of auxiliary switch；
Step 2：Auxiliary switch is connected once or twice before primary side power switch tube is opened so that when auxiliary switch is connected
Interior transformer primary side power winding is short-circuited；
Step 3：Synchronous commutating control circuit generates synchronous rectifier control according to the voltage signal at secondary synchronous rectifier both ends
Signal.
11. a kind of control method of synchronous rectification inverse-excitation type DC-DC power conversion equipment according to claim 10,
It is characterized in that, auxiliary switch is operated in the electric current progressive die in the synchronous rectification inverse-excitation type DC-DC power conversion equipment
When formula, be connected once or twice before primary side power switch tube is opened；Auxiliary switch is in the synchronous rectification inverse-excitation type direct current-
When apparatus for converting DC power is operated in discontinuous conduct mode or electric current critical discontinuous mode, it is opened in primary side power switch tube
Preceding conducting is primary, twice or is not turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810361374.4A CN108448902B (en) | 2018-04-20 | 2018-04-20 | Synchronous rectification flyback DC-DC power supply conversion device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810361374.4A CN108448902B (en) | 2018-04-20 | 2018-04-20 | Synchronous rectification flyback DC-DC power supply conversion device and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108448902A true CN108448902A (en) | 2018-08-24 |
| CN108448902B CN108448902B (en) | 2023-11-21 |
Family
ID=63201112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810361374.4A Active CN108448902B (en) | 2018-04-20 | 2018-04-20 | Synchronous rectification flyback DC-DC power supply conversion device and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108448902B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934557A (en) * | 2020-09-28 | 2020-11-13 | 广东希荻微电子有限公司 | Synchronous rectification circuit and power conversion device |
| CN113131745A (en) * | 2021-03-16 | 2021-07-16 | 广州金升阳科技有限公司 | Control method and control circuit of flyback power supply |
| CN113708631A (en) * | 2021-03-16 | 2021-11-26 | 广州金升阳科技有限公司 | Flyback converter and control method and control device thereof |
| CN113809950A (en) * | 2021-08-26 | 2021-12-17 | 南京航空航天大学 | Piezoelectric semi-active control device based on flyback transformer |
| CN114142560A (en) * | 2021-11-29 | 2022-03-04 | 东莞新能安科技有限公司 | Protection circuit, battery management system, battery pack and electric equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453169A (en) * | 2008-12-02 | 2009-06-10 | 广州金升阳科技有限公司 | Self-oscillation starting output end controlled anti exciting converter |
| CN101588129A (en) * | 2009-06-30 | 2009-11-25 | 南京航空航天大学 | A kind of multiple input flyback converter |
| US9369050B1 (en) * | 2014-04-21 | 2016-06-14 | Universal Lighting Technologies, Inc. | Indirect current sensing method for a constant current flyback converter |
| US20170054375A1 (en) * | 2015-08-19 | 2017-02-23 | Astec International Limited | Fixed Frequency Discontinuous Conduction Mode Flyback Power Converters Employing Zero Voltage Switching |
-
2018
- 2018-04-20 CN CN201810361374.4A patent/CN108448902B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453169A (en) * | 2008-12-02 | 2009-06-10 | 广州金升阳科技有限公司 | Self-oscillation starting output end controlled anti exciting converter |
| CN101588129A (en) * | 2009-06-30 | 2009-11-25 | 南京航空航天大学 | A kind of multiple input flyback converter |
| US9369050B1 (en) * | 2014-04-21 | 2016-06-14 | Universal Lighting Technologies, Inc. | Indirect current sensing method for a constant current flyback converter |
| US20170054375A1 (en) * | 2015-08-19 | 2017-02-23 | Astec International Limited | Fixed Frequency Discontinuous Conduction Mode Flyback Power Converters Employing Zero Voltage Switching |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934557A (en) * | 2020-09-28 | 2020-11-13 | 广东希荻微电子有限公司 | Synchronous rectification circuit and power conversion device |
| CN113131745A (en) * | 2021-03-16 | 2021-07-16 | 广州金升阳科技有限公司 | Control method and control circuit of flyback power supply |
| CN113708631A (en) * | 2021-03-16 | 2021-11-26 | 广州金升阳科技有限公司 | Flyback converter and control method and control device thereof |
| CN113809950A (en) * | 2021-08-26 | 2021-12-17 | 南京航空航天大学 | Piezoelectric semi-active control device based on flyback transformer |
| CN113809950B (en) * | 2021-08-26 | 2023-01-06 | 南京航空航天大学 | Piezoelectric semi-active control device based on flyback transformer |
| CN114142560A (en) * | 2021-11-29 | 2022-03-04 | 东莞新能安科技有限公司 | Protection circuit, battery management system, battery pack and electric equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108448902B (en) | 2023-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7218081B2 (en) | Power system having multiple power converters with reduced switching loss | |
| US8743565B2 (en) | High power converter architecture | |
| Yu et al. | High efficiency converter with charge pump and coupled inductor for wide input photovoltaic AC module applications | |
| CN101572490B (en) | Zero-voltage switch flyback-type DC-DC power supply conversion device | |
| US9019724B2 (en) | High power converter architecture | |
| CN108448902A (en) | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment and control method | |
| US8169796B2 (en) | Isolated switching power supply apparatus | |
| US6906930B2 (en) | Structure and method for an isolated boost converter | |
| Chung et al. | A zero-current-switching PWM flyback converter with a simple auxiliary switch | |
| Lin et al. | Analysis of parallel-connected asymmetrical soft-switching converter | |
| CN205960954U (en) | Turn over and swash control circuit | |
| CN108418435A (en) | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment | |
| EP3509203B1 (en) | Converter with zvs | |
| CN103066855A (en) | System and method used for no-voltage switch in power source transformation system | |
| US20230253885A1 (en) | Soft-switching pulse-width modulated dc-dc power converter | |
| CN101355305B (en) | Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor | |
| US6239989B1 (en) | Forward converter with improved reset circuitry | |
| CN108667304A (en) | Synchronous rectification inverse-excitation type DC-DC power conversion equipment and control method | |
| US20040042237A1 (en) | Third winding reset forward converter | |
| CN203617902U (en) | Integrated buck-flyback type high power factor constant current circuit and device | |
| CN103647448A (en) | Integrated step-down-flyback type high power factor constant current circuit and device | |
| CN109980903A (en) | A kind of driving circuit and power supply | |
| CN107222109B (en) | A kind of two-way isolated DC-DC converter containing active snubber | |
| US7548442B2 (en) | Power converter with coupled inductor | |
| CN208158436U (en) | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |