CN106712472B - A kind of control method and ACF circuit of ACF circuit - Google Patents
A kind of control method and ACF circuit of ACF circuit Download PDFInfo
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- CN106712472B CN106712472B CN201710114874.3A CN201710114874A CN106712472B CN 106712472 B CN106712472 B CN 106712472B CN 201710114874 A CN201710114874 A CN 201710114874A CN 106712472 B CN106712472 B CN 106712472B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The embodiment of the present application discloses the control method and ACF circuit of a kind of ACF circuit, and ACF circuit includes ACF main power circuit, PWM controller and voltage feedback circuit, and ACF main power circuit includes main switch and clamping switch tube；The described method includes: the output voltage Vo for the ACF main power circuit that PWM controller is obtained according to voltage feedback circuit adjusts the duty ratio of main switch S1；PWM controller is according to the control parameter in the working condition adjustment ACF main power circuit of main switch S1 in ACF main power circuit, so that main switch S1 work is in Sofe Switch state.The embodiment of the present application adjustment is timely, in addition, PWM controller can also be according to the control parameter in the working condition adjustment ACF main power circuit of main switch S1 in ACF main power circuit, so that main switch S1 work is in Sofe Switch state；The switching loss for reducing main switch in this way improves the efficiency of ACF circuit.
Description
Technical field
This application involves circuit fields, and in particular to a kind of control method and ACF circuit of ACF circuit.
Background technique
Active clamp flyback (Active Clamp Flyback, ACF) circuit is that by the topological circuit of Sofe Switch,
(Zero Voltage Switching, ZVS) or zero-current switching (Zero are opened since no-voltage may be implemented in Sofe Switch
Current Switching, ZCS), it is achieved that Sofe Switch can reduce the switching loss of switching tube in ACF circuit.
In actual work, the operating status of switching tube may be ACF circuit in ACF circuit: cross Sofe Switch state, hard switching
State or Sofe Switch state.When switching tube is Sofe Switch state, the switching loss of ACF circuit is minimum, efficiency highest.
In order to make the switching tube in ACF circuit work in Sofe Switch state, in the prior art, two methods are generallyd use
It realizes, a kind of method is using determine frequency method, and another method is to utilize A-D converter (Analog-to-Digital
Converter, ADC) to embody ZVS feature signal digitize after control again.
Wherein, determining frequency method is to realize ZVS under certain condition by parameter designing guarantee, it should be noted that this side
Method does not have adaptivity, cannot adjust switching frequency according to the change of switch tube working status in ACF circuit, cause certain
The switching tube in ACF circuit may be made to work under working condition and crossing Sofe Switch state or hard switching state, be not able to satisfy defeated
Enter to export overall performance in gamut optimal.
Method using ADC is by the signal for embodying ZVS feature by high-speed ADC converter (for example, voltage or electric current shake
Swing, vds failing edge etc.) digitlization, by the signal in controller calculation processing and adjustment circuit, this method can be realized full model
The ZVS in input/output bound is enclosed, but this method will use ADC converter, circuit is complicated, and resource consumption is big, at high cost.
It is limited to the speed of detection circuit, ADC converter and controller simultaneously, causes entirely to detect conversion and control process slow, it is difficult to do
To quickly adjustment in real time, using limited obvious especially under high frequency occasion.
Summary of the invention
The embodiment of the present application provides the control method and ACF circuit of a kind of ACF circuit, can be in time to ACF circuit
In switching device controlled, make switching device work in Sofe Switch state, advantageously reduce the switch of switching device in ACF
Loss.
In a first aspect, the embodiment of the present application provides a kind of control method of ACF circuit, the ACF circuit includes: ACF
Main power circuit, pulsewidth modulation (Pulse-Width Modulation, PWM) controller and voltage feedback circuit, the ACF
Main power circuit includes main switch S1 and clamping switch tube S2；The described method includes:
The output voltage Vo for the ACF main power circuit that the PWM controller is obtained according to the voltage feedback circuit
Adjust the duty ratio of main switch S1；
Described in the working condition adjustment of PWM controller main switch S1 according to the ACF main power circuit
Control parameter in ACF main power circuit, so that main switch S1 work is in Sofe Switch state；Wherein, the main switch
The working condition of pipe S1 includes: hard switching state and non-hard switching state, the non-hard switching state include: Sofe Switch state and
Cross Sofe Switch state.
The embodiment of the present application, PWM controller can adjust accounting for for main switch according to the output voltage of ACF main power circuit
Empty ratio, adjustment is timely, in addition, PWM controller can also be adjusted according to the working condition of main switch S1 in ACF main power circuit
Control parameter in ACF main power circuit, so that main switch S1 work is in Sofe Switch state；Main switch can be reduced in this way
Switching loss, improve ACF circuit efficiency.
In the possible implementation of first aspect, institute that the PWM controller is obtained according to the voltage feedback circuit
State the duty ratio of the output voltage Vo adjustment main switch S1 of ACF main power circuit, comprising:
When the output voltage Vo is greater than preset output voltage Vo ', then reduce the duty ratio of the main switch S1；
When the output voltage Vo is less than preset output voltage Vo ', then increase the duty ratio of the main switch S1；
Wherein, the preset output voltage Vo ' is voltage corresponding with the load circuit of the ACF circuit.
In the possible implementation of first aspect, the PWM controller is main according to the ACF main power circuit
The working condition of switching tube S1 adjusts the control parameter in the ACF main power circuit, comprising:
When ACF circuit work is in electric current critical continuous conduction mode, the PWM controller is according to the main switch S1
Working condition adjust the working frequency of the main switch S1.
In the possible implementation of first aspect, the PWM controller is according to the working condition of the main switch S1
Adjust the working frequency of the main switch S1, comprising:
When the working condition of the main switch S1 is hard switching state, the work frequency of the main switch S1 is turned down
Rate；
When the working condition of the main switch S1 is non-hard switching state, the work frequency of the main switch S1 is turned up
Rate.
In the possible implementation of first aspect, the PWM controller is main according to the ACF main power circuit
The working condition of switching tube S1 adjusts the control parameter in the ACF main power circuit, comprising:
When ACF circuit work is in discontinuous conduct mode, the PWM controller is according to the work of the main switch S1
The duration that the clamping switch tube S2 is opened for the second time in switch periods is adjusted as state.
In the possible implementation of first aspect, the PWM controller is according to the working condition of the main switch S1
Adjust the duration that the clamping switch tube S2 is opened for the second time in switch periods, comprising:
When the working condition of the main switch S1 is hard switching state, increase the clamping switch tube S2 in switch week
The interim duration opened for the second time；
When the working condition of the main switch S1 is non-hard switching state, reduces the clamping switch tube S2 and switching
The duration opened for the second time in period.
Second aspect, the embodiment of the present application provide a kind of ACF circuit, comprising: the ACF main power circuit that is sequentially connected,
Signal detection adjustment circuit, pulse-generating circuit and PWM controller, and it is connected to the ACF main power circuit and institute
State the voltage feedback circuit and driving circuit between PWM controller；Wherein
The signal detection adjustment circuit, for obtaining the Drain-Source of main switch S1 in the ACF main power circuit
Voltage Vds, and for carrying out transformation to the dram-source voltage Vds；
The pulse-generating circuit, for determining institute according to the value Vdetect after the dram-source voltage Vds transformation
It is also non-hard switching state that the working condition for stating main switch S1, which is hard switching state, when the main switch S1 is hard switching shape
When state, then pulse signal is generated；When the main switch S1 is non-hard switching state, then pulse signal is not generated；
The PWM controller, for exporting first voltage Vgs1, the first voltage Vgs1 drives by the driving circuit
The main switch S1 work is controlled after dynamic；And for exporting second voltage Vgs2, described in the second voltage Vgs2 passes through
The clamping switch tube S2 work is controlled after driving circuit driving；And for whether exporting arteries and veins according to the pulse-generating circuit
It rushes signal and adjusts control parameter in the Vgs1 and Vgs2, so that main switch S1 work is in Sofe Switch state；And
The output voltage of the ACF main power circuit for being obtained according to the voltage feedback circuit changes the main switch S1's
Duty ratio；Wherein, the working condition of the main switch S1 includes: hard switching state and non-hard switching state, described non-to open firmly
Off status includes: Sofe Switch state and Sofe Switch state excessively.
The embodiment of the present application, PWM controller can adjust accounting for for main switch according to the output voltage of ACF main power circuit
Empty ratio, adjustment is timely, in addition, PWM controller can also be adjusted according to the working condition of main switch S1 in ACF main power circuit
Control parameter in ACF main power circuit, so that main switch S1 work is in Sofe Switch state；Main switch can be reduced in this way
Switching loss, improve ACF circuit efficiency.
In the possible implementation of second aspect, ACF circuit can also include: clock circuit；
The clock circuit is connected with the PWM controller, for generating trigger signal；
The PWM controller is when obtaining the clock circuit generation trigger signal, according to the work shape of main switch S1
State adjusts the control parameter in the Vgs1 and Vgs2.
In the possible implementation of second aspect, ACF circuit can also include: clock circuit and counter；
The clock circuit is connected with the PWM controller and the counter, for generating trigger signal；
The counter is connected between the pulse-generating circuit and PWM controller, for generating electricity to the pulse
The number for the pulse signal that road generates is counted；
The PWM controller adjusts institute when the clock circuit generates trigger signal, according to the count results of counter
State the control parameter in Vgs1 and Vgs2.
In the possible implementation of second aspect, the pulse-generating circuit includes: comparison circuit and compared with described
Circuit connected window signal generation circuit and reference voltage Vth circuit
The window signal generation circuit is connected with the output end of the PWM controller, according to the defeated of the PWM controller
Signal exports the window signal intercepted to the input voltage Vdetect of the comparison circuit out；
The comparison circuit intercepts the Vdetect according to the window signal that the window signal generation circuit exports
A part of signal, and a part of signal of the Vdetect of interception is compared with the reference voltage Vth, according to
Comparison result determine the main switch S1 working condition be hard switching state be also non-hard switching state.
In the possible implementation of second aspect, the comparison circuit includes: first diode, comparator and reference
Potential circuit；
Wherein, the anode of the first diode is connected with the output end of the signal detection adjustment circuit, and described first
The cathode of diode is connected with the inverting input terminal of the comparator, and the forward direction of the reference voltage circuit and the comparator is defeated
Enter end to be connected；
The window signal generation circuit include: positioned at the first branch between the inverting input terminal of the comparator
And second branch, wherein the first branch includes switching and the second diode, the cathode of second diode and the ratio
Inverting input terminal compared with device is connected, the window signal generation circuit further include: first resistor and reverser INV1, wherein institute
It states first resistor to be connected between default power Vcc and the positive terminal of second diode, the input of the reverser INV1
End is connected with the output end of the PWM controller, and the output end of the reverser INV1 is extremely connected with the g of the switch S3,
In, the default power Vcc is greater than the reference voltage Vth.
The third aspect, the embodiment of the present application provide a kind of terminal, including power circuit, load circuit, such as first aspect
Or the arbitrary possible ACF circuit of first aspect；Wherein, the power supply that the power circuit provides is through the ACF circuit transformation
The backward load circuit power supply.
Based on above technical scheme, a kind of control method and ACF circuit of ACF circuit provided by the embodiments of the present application, energy
Enough duty ratios that main switch is adjusted according to the output voltage of ACF main power circuit, adjustment is timely, in addition, PWM controller can also
Control parameter in enough working condition adjustment ACF main power circuits according to main switch S1 in ACF main power circuit, so that main
Switching tube S1 works in Sofe Switch state；The switching loss of main switch can be reduced in this way, and the embodiment of the present application improves ACF
The efficiency of circuit.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application or in background technique below will be implemented the application
Attached drawing needed in example or background technique is illustrated.
Fig. 1 be include ACF circuit a kind of terminal structural schematic diagram；
Fig. 2-a is a kind of structural schematic diagram for ACF circuit that one embodiment of the application provides；
Fig. 2-b is a kind of structural schematic diagram for ACF circuit that one embodiment of the application provides；
Fig. 3-a is a kind of structural schematic diagram for terminal including ACF circuit that another embodiment of the application provides；
Fig. 3-b is a kind of structural schematic diagram for terminal including ACF circuit that another embodiment of the application provides；
Fig. 4-a is a kind of structural schematic diagram for terminal including ACF circuit that another embodiment of the application provides；
Fig. 4-b is a kind of structural schematic diagram for terminal including ACF circuit that another embodiment of the application provides；
Fig. 5 is the electrical block diagram for including window signal generation circuit；
Fig. 6 is the work of ACF circuit in electric current critical continuous conduction mode, coherent signal schematic diagram；
Fig. 7 is the work of ACF circuit in discontinuous conduct mode, coherent signal schematic diagram.
Specific embodiment
The embodiment of the present application is described below with reference to the attached drawing in the embodiment of the present application.
Referring to Figure 1, Fig. 1 is the structural schematic diagram of the terminal provided by the embodiments of the present application including ACF circuit.In the reality
Applying terminal 100 in example includes power circuit 300, load circuit 400, ACF circuit 200；Wherein, power circuit 300 is through ACF circuit
It powers after 200 transformations to load circuit 400.
Fig. 2-a is referred to, Fig. 2-a is a schematic diagram of ACF circuit 200, including the ACF main power circuit being sequentially connected
201, signal detection adjustment circuit 202, pulse-generating circuit 203 and PWM controller 204, and it is connected to the main power of ACF
Voltage feedback circuit 206 and driving circuit 205 between circuit 201 and PWM controller 204.
Wherein, ACF main power circuit 201 is identical as the structure of ACF main power circuit in Fig. 3-a, comprising: transformer, position
Clamp capacitor in that side of transformer primary side, main switch S1, clamping switch tube S2, and the output positioned at transformer secondary
Capacitor and rectifier diode.
Signal detection adjustment circuit 202, for obtaining the Drain-Source electricity of main switch S1 in ACF main power circuit 201
Vds is pressed, and for carrying out transformation to dram-source voltage Vds, is adjusted to be suitble to the range of rear class processing.
Pulse-generating circuit 203, for determining main switch according to the value Vdetect after dram-source voltage Vds transformation
The working condition of S1 is that hard switching state is also non-hard switching state, when main switch S1 is hard switching state, then generates arteries and veins
Rush signal；When main switch S1 is non-hard switching state, then pulse signal is not generated.The structure of shown pulse-generating circuit with
The structure of pulse-generating circuit shown in Fig. 3-a is identical, including comparison circuit, reference voltage circuit and window signal generate
Circuit.
PWM controller 204, for exporting first voltage Vgs1, first voltage Vgs1 is controlled after the driving of overdrive circuit 205
Main switch S1 work processed；And for exporting second voltage Vgs2, the second voltage Vgs2 drives through overdrive circuit 205
Control clamping switch tube S2 work afterwards；And for according to pulse-generating circuit 203 whether output pulse signal adjustment Vgs1 and
Control parameter in Vgs2, so that main switch S1 work is in Sofe Switch state；And for being obtained according to voltage feedback circuit 206
The output voltage of the ACF main power circuit taken changes the duty ratio of main switch S1；Wherein, the working condition packet of main switch S1
Include: hard switching state and non-hard switching state, non-hard switching state include: Sofe Switch state and Sofe Switch state excessively.
Fig. 2-b is referred to, Fig. 2-b is a schematic diagram of the ACF circuit that another embodiment provides, the difference with Fig. 2-a
It is that the ACF circuit 200 ' shown in Fig. 2-b further includes clock circuit 207, clock circuit 207 is connected with PWM controller, is used for
Generate trigger signal；PWM controller 204 is when obtaining clock circuit 207 and generating trigger signal according to the work of main switch S1
State adjusts the control parameter in Vgs1 and Vgs2.Such as Fig. 3-a, shown in Fig. 3-b, ACF circuit also includes clock circuit
In some possible embodiments of the present invention, such as Fig. 4-a, shown in Fig. 4-b, ACF circuit may include: clock electricity
Road and counter.
The clock circuit is connected with the PWM controller, for generating trigger signal；
The PWM controller just adjusts in the Vgs1 and Vgs2 when obtaining the clock circuit and generating trigger signal
Control parameter.
The counter is connected between the pulse-generating circuit and PWM controller, for generating electricity to the pulse
The number for the pulse signal that road generates is counted；
The PWM controller when the clock circuit generates trigger signal, according to the count results of counter (for example,
The count results of counter are greater than the control parameter 0) adjusted in the Vgs1 and Vgs2.
Optionally, in some possible embodiments of present aspect, pulse-generating circuit include: comparison circuit and with institute
State comparison circuit connected window signal generation circuit and reference voltage Vth circuit
Window signal generation circuit is connected with the output end of the PWM controller, is believed according to the output of the PWM controller
Number output window signal that the input voltage Vdetect of the comparison circuit is intercepted；
Comparison circuit intercepts the one of the Vdetect according to the window signal that the window signal generation circuit exports
Part signal, and a part of signal of the Vdetect of interception is compared with the reference voltage Vth, according to comparing
As a result it is also non-hard switching state that the working condition for determining the main switch S1, which is hard switching state,.
As shown in figure 5, comparison circuit includes: first diode D1, comparator CMP1 and reference voltage circuit；
Wherein, the anode of first diode D1 is connected with the output end of signal detection adjustment circuit, first diode D1's
Cathode is connected with the inverting input terminal of comparator CMP1, and reference voltage circuit is connected with the positive input of comparator CMP1；
Window signal generation circuit include: positioned at the first branch and between the inverting input terminal of the comparator
Two branches, wherein the first branch includes switch S3 and the second diode D2, and the cathode of the second diode D2 is compared with described
The inverting input terminal of device is connected, window signal generation circuit further include: first resistor R1 and reverser INV1, wherein the first electricity
Resistance R1 is connected between default power Vcc and the positive terminal of the second diode D2, the input terminal and PWM controller of reverser INV1
Output end be connected, the output end of reverser INV1 is extremely connected with the g of switch S3, wherein presets power Vcc greater than the reference
Voltage Vth.
When it is implemented, the output voltage Vo tune for the ACF main power circuit that PWM controller is obtained according to voltage feedback circuit
The duty ratio of whole main switch S1；
Described in the working condition adjustment of PWM controller main switch S1 according to the ACF main power circuit
Control parameter in ACF main power circuit, so that main switch S1 work is in Sofe Switch state；Wherein, the main switch
The working condition of pipe S1 includes: hard switching state and non-hard switching state, the non-hard switching state include: Sofe Switch state and
Cross Sofe Switch state.
In some possible embodiments of the present invention, PWM controller is according to voltage feedback circuit acquisition
The duty ratio of the output voltage Vo adjustment main switch S1 of ACF main power circuit, comprising:
When the output voltage Vo is greater than preset output voltage Vo ', then reduce the duty ratio of the main switch S1；
When the output voltage Vo is less than preset output voltage Vo ', then increase the duty ratio of the main switch S1；
Wherein, the preset output voltage Vo ' is voltage corresponding with the load circuit of the ACF circuit.
Described in the working condition adjustment of PWM controller main switch S1 according to the ACF main power circuit
Control parameter in ACF main power circuit, comprising:
When ACF circuit work is in electric current critical continuous conduction mode, the PWM controller is according to the main switch S1
Working condition adjust the working frequency of the main switch S1.
When ACF circuit work is in electric current critical continuous conduction mode, coherent signal schematic diagram is as shown in Figure 6.Window letter
Number generation circuit can intercept the coherent signal in the corresponding section t3~t5.
When the working condition of the main switch S1 is hard switching state, the work frequency of the main switch S1 is turned down
Rate, if figure is as shown in curve 6 in 6.
When the working condition of the main switch S1 is non-hard switching state, the work frequency of the main switch S1 is turned up
Rate, if figure is as shown in curve 7 in 6.
In some possible embodiments of the present invention, PWM controller master according to the ACF main power circuit is opened
The working condition for closing pipe S1 adjusts the control parameter in the ACF main power circuit, comprising:
When ACF circuit work is in discontinuous conduct mode, the PWM controller is according to the work of the main switch S1
The duration that the clamping switch tube S2 is opened for the second time in switch periods is adjusted as state.
When ACF circuit work is in discontinuous conduct mode, coherent signal schematic diagram is as shown in Figure 7.Window signal produces
Raw circuit can intercept the coherent signal in the corresponding section t7~t8.
PWM controller adjusts the clamping switch tube S2 in switch periods according to the working condition of the main switch S1
The duration opened for the second time, comprising:
When the working condition of the main switch S1 is hard switching state, increase the clamping switch tube S2 in switch week
The interim duration opened for the second time；
When the working condition of the main switch S1 is non-hard switching state, reduces the clamping switch tube S2 and switching
The duration opened for the second time in period.
Based on above technical scheme, a kind of control method and ACF circuit of ACF circuit provided by the embodiments of the present application, energy
Enough duty ratios that main switch is adjusted according to the output voltage of ACF main power circuit, adjustment is timely, in addition, PWM controller can also
Control parameter in enough working condition adjustment ACF main power circuits according to main switch S1 in ACF main power circuit, so that main
Switching tube S1 works in Sofe Switch state；The switching loss of main switch can be reduced in this way, and the embodiment of the present application improves ACF
The efficiency of circuit.
Step in the embodiment of the present application method can be sequentially adjusted, merged and deleted according to actual needs.
Unit in the embodiment of the present application device can be combined, divided and deleted according to actual needs.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, the process
Relevant hardware can be instructed to complete by computer program, which can be stored in computer-readable storage medium, should
Program is when being executed, it may include such as the process of above-mentioned each method embodiment.And storage medium above-mentioned includes: read-only memory
(Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM), magnetic or disk
Etc. the medium of various program storage codes.
Claims (12)
1. a kind of control method of ACF circuit, which is characterized in that the ACF circuit includes: ACF main power circuit, PWM control
Device and voltage feedback circuit, the ACF main power circuit include main switch S1 and clamping switch tube S2；The described method includes:
The output voltage Vo for the ACF main power circuit that the PWM controller is obtained according to the voltage feedback circuit is adjusted
The duty ratio of main switch S1；
The working condition of PWM controller main switch S1 according to the ACF main power circuit adjusts the ACF master
Control parameter in power circuit, so that main switch S1 work is in Sofe Switch state；Wherein, the main switch S1
Working condition includes: hard switching state and non-hard switching state, and the non-hard switching state includes: Sofe Switch state and excessively soft opens
Off status.
2. the method as described in claim 1, which is characterized in that
The output voltage Vo for the ACF main power circuit that the PWM controller is obtained according to the voltage feedback circuit is adjusted
The duty ratio of main switch S1, comprising:
When the output voltage Vo is greater than preset output voltage Vo ', then reduce the duty ratio of the main switch S1；
When the output voltage Vo is less than preset output voltage Vo ', then increase the duty ratio of the main switch S1；
Wherein, the preset output voltage Vo ' is voltage corresponding with the load circuit of the ACF circuit.
3. the method as described in claim 1, which is characterized in that
The working condition of PWM controller main switch S1 according to the ACF main power circuit adjusts the ACF master
Control parameter in power circuit, comprising:
When ACF circuit work is in electric current critical continuous conduction mode, the PWM controller is according to the work of the main switch S1
The working frequency of the main switch S1 is adjusted as state.
4. method as claimed in claim 3, which is characterized in that the PWM controller is according to the work of the main switch S1
State adjusts the working frequency of the main switch S1, comprising:
When the working condition of the main switch S1 is hard switching state, the working frequency of the main switch S1 is turned down；
When the working condition of the main switch S1 is non-hard switching state, the working frequency of the main switch S1 is turned up.
5. the method as described in claim 1, which is characterized in that
The working condition of PWM controller main switch S1 according to the ACF main power circuit adjusts the ACF master
Control parameter in power circuit, comprising:
When ACF circuit work is in discontinuous conduct mode, the PWM controller is according to the work shape of the main switch S1
State adjusts the duration that the clamping switch tube S2 is opened for the second time in switch periods.
6. method as claimed in claim 3, which is characterized in that the PWM controller is according to the work of the main switch S1
State adjusts the duration that the clamping switch tube S2 is opened for the second time in switch periods, comprising:
When the working condition of the main switch S1 is hard switching state, increase the clamping switch tube S2 in switch periods
The duration opened for the second time；
When the working condition of the main switch S1 is non-hard switching state, reduce the clamping switch tube S2 in switch periods
In the duration opened for the second time.
7. a kind of ACF circuit characterized by comprising the ACF main power circuit that is sequentially connected, signal detection adjustment circuit, arteries and veins
Generation circuit and PWM controller are rushed, and the electricity being connected between the ACF main power circuit and the PWM controller
Press feed circuit and driving circuit；Wherein
The signal detection adjustment circuit, for obtaining the dram-source voltage of main switch S1 in the ACF main power circuit
Vds, and for carrying out transformation to the dram-source voltage Vds；
The pulse-generating circuit, for determining the master according to the value Vdetect after the dram-source voltage Vds transformation
The working condition of switching tube S1 is that hard switching state is also non-hard switching state, when the main switch S1 is hard switching state
When, then generate pulse signal；When the main switch S1 is non-hard switching state, then pulse signal is not generated；
The PWM controller, for exporting first voltage Vgs1, the first voltage Vgs1 is after driving circuit driving
Control the main switch S1 work；And for exporting second voltage Vgs2, the second voltage Vgs2 passes through the driving
Clamping switch tube S2 work is controlled after circuit drives；And for according to the pulse-generating circuit whether output pulse signal tune
Control parameter in the whole Vgs1 and Vgs2, so that main switch S1 work is in Sofe Switch state；And it is used for basis
The output voltage for the ACF main power circuit that the voltage feedback circuit obtains changes the duty ratio of the main switch S1；
Wherein, the working condition of the main switch S1 includes: hard switching state and non-hard switching state, the non-hard switching state packet
It includes: Sofe Switch state and excessively Sofe Switch state.
8. ACF circuit as claimed in claim 7, which is characterized in that further include: clock circuit；
The clock circuit is connected with the PWM controller, for generating trigger signal；
The PWM controller is when obtaining the clock circuit generation trigger signal, according to the working condition tune of main switch S1
Control parameter in the whole Vgs1 and Vgs2.
9. ACF circuit as claimed in claim 7, which is characterized in that further include: clock circuit and counter；
The clock circuit is connected with the PWM controller and the counter, for generating trigger signal；
The counter is connected between the pulse-generating circuit and PWM controller, for producing to the pulse-generating circuit
The number of raw pulse signal is counted；
The PWM controller generates trigger signal, according to the adjustment of the count results of the counter in the clock circuit
Control parameter in Vgs1 and Vgs2.
10. such as the described in any item ACF circuits of claim 7 to 9, which is characterized in that
The pulse-generating circuit include: comparison circuit and the window signal generation circuit being connected with the comparison circuit and
Reference voltage Vth circuit
The window signal generation circuit is connected with the output end of the PWM controller, is believed according to the output of the PWM controller
Number output window signal that the input voltage Vdetect of the comparison circuit is intercepted；
The comparison circuit intercepts the one of the Vdetect according to the window signal that the window signal generation circuit exports
Part signal, and a part of signal of the Vdetect of interception is compared with the reference voltage Vth, according to comparing
As a result it is also non-hard switching state that the working condition for determining the main switch S1, which is hard switching state,.
11. ACF circuit as claimed in claim 10, which is characterized in that
The comparison circuit includes: first diode, comparator and reference voltage circuit；
Wherein, the anode of the first diode is connected with the output end of the signal detection adjustment circuit, the one or two pole
The cathode of pipe is connected with the inverting input terminal of the comparator, the positive input of the reference voltage circuit and the comparator
It is connected；
The window signal generation circuit include: positioned at the first branch and between the inverting input terminal of the comparator
Two branches, wherein the first branch includes switch and the second diode, the cathode and the comparator of second diode
Inverting input terminal be connected, the window signal generation circuit further include: first resistor and reverser INV1, wherein described the
One resistance is connected between default power Vcc and the positive terminal of second diode, the input terminal of the reverser INV1 with
The output end of the PWM controller is connected, and the output end of the reverser INV1 is connected with the grid of switch S3, the leakage of switch S3
Pole is connect with the positive terminal of the second diode D2, the source electrode ground connection of switch S3, wherein the default power Vcc is greater than the ginseng
Examine voltage Vth.
12. a kind of terminal, which is characterized in that including power circuit, load circuit and such as any one of claim 7 to 11 institute
The ACF circuit stated；Wherein, the power supply that the power circuit provides is powered after the ACF circuit transformation to the load circuit.
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| CN108809107B (en) * | 2018-07-13 | 2019-08-23 | 深圳南云微电子有限公司 | A kind of method and circuit of the self adaptive control of active clamp flyback converter |
| CN109245569B (en) | 2018-09-18 | 2020-04-24 | 西安矽力杰半导体技术有限公司 | Flyback converter and control circuit thereof |
| CN109639149B (en) | 2018-12-26 | 2020-07-28 | 西安华为技术有限公司 | ACF converter, voltage conversion method and electronic equipment |
| CN111865056B (en) * | 2020-08-31 | 2021-05-14 | 华源智信半导体(深圳)有限公司 | Power converter and current comparison feedback circuit |
| CN114189160B (en) * | 2021-12-07 | 2023-12-12 | 南京微盟电子有限公司 | Light-load conduction control method and circuit for clamping tube in active clamping flyback topology |
| CN114256921A (en) * | 2021-12-09 | 2022-03-29 | 湖南炬神电子有限公司 | Subminiature charger |
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| US6069803A (en) * | 1999-02-12 | 2000-05-30 | Astec International Limited | Offset resonance zero volt switching flyback converter |
| CN100514817C (en) * | 2007-04-29 | 2009-07-15 | 北京新雷能有限责任公司 | Zero voltage switch active clamp positive and negative violent changer |
| CN101572490B (en) * | 2009-06-15 | 2012-05-30 | 浙江大学 | Zero-voltage switch flyback-type DC-DC power supply conversion device |
| CN102629831B (en) * | 2012-04-01 | 2014-07-09 | 华为技术有限公司 | Method, circuit and device for soft switch detection |
| CN103956904A (en) * | 2014-05-14 | 2014-07-30 | 江苏斯达工业科技有限公司 | Fly-back electric power converter topological structure and control method thereof |
| CN104022657B (en) * | 2014-06-27 | 2016-09-07 | 崇贸科技股份有限公司 | control circuit and control method |
| CN106059313B (en) * | 2016-07-19 | 2018-05-29 | 深圳南云微电子有限公司 | The circuit of reversed excitation and its control method of active clamp |
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