CN108696131A - control device and control method - Google Patents
control device and control method Download PDFInfo
- Publication number
- CN108696131A CN108696131A CN201710524223.1A CN201710524223A CN108696131A CN 108696131 A CN108696131 A CN 108696131A CN 201710524223 A CN201710524223 A CN 201710524223A CN 108696131 A CN108696131 A CN 108696131A
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- Prior art keywords
- flyback converter
- excitatory
- negative current
- output voltage
- control device
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—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
-
- 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
Abstract
This disclosure relates to which a kind of control device and control method, are applied to flyback converter, which includes auxiliary switch, which includes:Output voltage integral unit obtains the amplitude of the excitatory negative current in flyback converter for being integrated by the output voltage to flyback converter;And compare control unit, for the amplitude of the excitatory negative current obtained to be compared with excitatory negative current a reference value, and according to the shutdown of comparison result control auxiliary switch.The disclosure can realize that no-voltage of the primary side switch pipe of flyback converter under different output voltages is open-minded.
Description
Technical field
This disclosure relates to power electronics field, more particularly to a kind of control device and control applied to flyback converter
Method processed.
Background technology
Currently, Emmitter diven quasi is the most popular circuit topological structure applied to small-power switching power-supply.It is accurate
Harmonic anti exciting converter inputs (V in low pressurebus<nVo, wherein:VbusFor input voltage;N is transformer primary and secondary lateral coil the number of turns
Than;VoFor output voltage) when the no-voltage of primary side power switch tube may be implemented open (ZVS), in high input voltage (Vbus>
nVo) when the Valley-Switching of primary side power switch tube may be implemented, thus switching loss can be substantially reduced.However, with height
Frequencyization develops, although Valley-Switching may be implemented in high input voltage for Emmitter diven quasi, turn-on consumption becomes
It is increasing, seriously affect the efficiency of converter.It cannot be completely real in high input voltage in order to solve Emmitter diven quasi
The no-voltage of existing primary side power switch tube opens (ZVS) this problem, and the prior art proposes secondary side synchronous rectifier Guan Yan
The novel circuits topological structure such as new control methods and active clamp flyback converter such as conducting late.
However, the prior art is only applicable to the constant situation of output voltage, the nothing under the applicable cases of variable output voltage
Method ensures realize that the no-voltage of primary side power switch tube is open-minded under the conditions of all working.
Therefore, how to develop a kind of control device and control method improving above-mentioned prior art problem, actually at present
Urgent demand.
Invention content
The disclosure is designed to provide a kind of control device and control method, so overcome at least to a certain extent by
One or more problem caused by the limitation and defect of the relevant technologies.
According to one aspect of the disclosure, a kind of control device is provided, flyback converter, the inverse-excitation converting are applied to
Device includes an auxiliary switch, and the control device includes:
Output voltage integral unit obtains described for being integrated by the output voltage to the flyback converter
The amplitude of excitatory negative current in flyback converter;And
Compare control unit, for comparing the amplitude of the excitatory negative current obtained and an excitatory negative current a reference value
Compared with, and control according to comparison result the shutdown of the auxiliary switch.
In a kind of exemplary embodiment of the disclosure, the auxiliary switch is synchronous rectifier, clamper tube, is connected in parallel on institute
It states the switch on the secondary side rectifier unit of flyback converter or is series at the switch of the auxiliary winding of the flyback converter.
In a kind of exemplary embodiment of the disclosure, the operating mode of the flyback converter is discontinuous mode or critical
Continuous mode.
In a kind of exemplary embodiment of the disclosure, carrying out integral to the output voltage of the flyback converter includes:
Start the output voltage integral unit by an enable signal, and list is integrated to the output voltage by a reset signal
Member is resetted.
In a kind of exemplary embodiment of the disclosure, under discontinuous mode, by detecting the open-minded of the auxiliary switch
Signal obtains the enable signal;And under critical continuous conduction mode, the zero crossing by detecting the excitatory negative current obtains
The enable signal.
In a kind of exemplary embodiment of the disclosure, the zero crossing for detecting the excitatory negative current includes:Pass through electric current
Itself internal resistance of mutual inductor, sample resistance or the auxiliary switch detects the zero crossing of the excitatory negative current.
In a kind of exemplary embodiment of the disclosure, the cut-off signals by detecting the auxiliary switch obtain described multiple
Position signal.
In a kind of exemplary embodiment of the disclosure, the relatively control unit, in the excitatory negative current
When amplitude is greater than or equal to the excitatory negative current a reference value, the shutdown of the auxiliary switch is controlled.
In a kind of exemplary embodiment of the disclosure, the flyback converter is RCD clampers flyback converter or active
Clamper flyback converter.
In a kind of exemplary embodiment of the disclosure, the control device further includes:
First excitatory negative current benchmark setup unit, it is described sharp for the input voltage setting based on the flyback converter
Magnetic negative current a reference value.
In a kind of exemplary embodiment of the disclosure, the control device further includes:
Second excitatory negative current benchmark setup unit is used for the input voltage based on the flyback converter and the flyback
The output voltage of converter sets the excitatory negative current a reference value.
In a kind of exemplary embodiment of the disclosure, the output voltage of the flyback converter is variable.
In a kind of exemplary embodiment of the disclosure, the output voltage of the flyback converter be 5V, 9V, 15V or
20V。
According to one aspect of the disclosure, a kind of Switching Power Supply, including the control dress described in above-mentioned any one are provided
It sets.
According to one aspect of the disclosure, a kind of control method is provided, flyback converter, the flyback converter are applied to
Including an auxiliary switch, the control method include:
It is integrated by the output voltage to the flyback converter excitatory negative in the flyback converter to obtain
The amplitude of electric current;
The amplitude of the excitatory negative current obtained is compared with an excitatory negative current a reference value;And
The shutdown of the auxiliary switch is controlled according to comparison result to realize that the primary side power of the flyback converter is opened
The no-voltage for closing pipe is open-minded.
In a kind of exemplary embodiment of the disclosure, the auxiliary switch is synchronous rectifier, clamper tube, is connected in parallel on institute
It states the switch on the secondary side rectifier unit of flyback converter or is series at the switch of the auxiliary winding of the flyback converter.
In a kind of exemplary embodiment of the disclosure, the operating mode of the flyback converter is discontinuous mode or critical
Continuous mode.
In a kind of exemplary embodiment of the disclosure, carrying out integral to the output voltage of the flyback converter includes:
Start to integrate the output voltage of the flyback converter by an integral circuit in response to an enable signal,
And the integral circuit is resetted in response to a reset signal.
In a kind of exemplary embodiment of the disclosure, under discontinuous mode, by detecting the open-minded of the auxiliary switch
Signal obtains the enable signal;And under critical continuous conduction mode, the zero crossing by detecting the excitatory negative current obtains
The enable signal.
In a kind of exemplary embodiment of the disclosure, pass through current transformer, sample resistance or the auxiliary switch
Itself internal resistance detect the zero crossing of the excitatory negative current.
In a kind of exemplary embodiment of the disclosure, obtains the reset by the cut-off signals of the auxiliary switch and believe
Number.
In a kind of exemplary embodiment of the disclosure, the zero of the primary side power switch tube of the flyback converter is realized
Voltage open including:
The inverse-excitation converting is realized by the resonance of a magnetizing inductance and a parasitic capacitance in the flyback converter
The no-voltage of the primary side power switch tube of device is open-minded.
In a kind of exemplary embodiment of the disclosure, the shutdown of the auxiliary switch is controlled according to comparison result to realize
The no-voltage of the primary side power switch tube of the flyback converter, which is opened, also includes:
When the amplitude of the excitatory negative current is greater than or equal to the excitatory negative current a reference value, controls the auxiliary and open
The shutdown of pass.
In a kind of exemplary embodiment of the disclosure, the flyback converter is RCD clampers flyback converter or active
Clamper flyback converter.
In a kind of exemplary embodiment of the disclosure, the control method further includes:
Input voltage based on the flyback converter sets the excitatory negative current a reference value.
In a kind of exemplary embodiment of the disclosure, the input voltage setting based on the flyback converter is described excitatory
Negative current a reference value includes:
The maximum value of input voltage based on the flyback converter sets the excitatory negative current a reference value.
In a kind of exemplary embodiment of the disclosure, the control method further includes:
The output voltage setting of input voltage and the flyback converter based on the flyback converter is described excitatory negative
Current reference value.
In a kind of exemplary embodiment of the disclosure, the output voltage of the flyback converter is variable.
In a kind of exemplary embodiment of the disclosure, the output voltage of the flyback converter be 5V, 9V, 15V or
20V。
Control device according to an example embodiment of the present disclosure and control method pass through the output electricity to flyback converter
Pressure is integrated to obtain the amplitude of the excitatory negative current in flyback converter, by the amplitude of the excitatory negative current obtained and is swashed
Magnetic negative current a reference value is compared, and the shutdown of auxiliary switch is controlled according to comparison result.On the one hand, by flyback converter
Output voltage integrated to obtain the amplitude of the excitatory negative current in flyback converter, different outputs can be obtained in real time
The amplitude of excitatory negative current under voltage;On the other hand, by the amplitude of the excitatory negative current obtained and excitatory negative current benchmark
Value is compared, and the shutdown of auxiliary switch is controlled according to comparison result, can be by reasonably setting excitatory negative current a reference value
To realize that no-voltage of the primary side switch pipe under different output voltages is open-minded.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
Fig. 1 is a kind of circuit diagram of the active clamp flyback converter in technical solution;
Fig. 2 is that a kind of discontinuous mode of the active clamp flyback converter in technical solution controls oscillogram;
Fig. 3 is a kind of circuit diagram of the RCD clamper flyback converters in technical solution;
Fig. 4 is that a kind of critical continuous conduction mode of the RCD clamper flyback converters in technical solution controls oscillogram;
Fig. 5 is the circuit diagram of the RCD clamper flyback converters in another technical solution;
Fig. 6 is the control principle schematic diagram of the control device of one preferred embodiment of the disclosure;
Fig. 7 is the control principle schematic diagram of the control device of another preferred embodiment of the disclosure;
Fig. 8 is the voltage integral circuit figure of disclosure another embodiment;
Fig. 9 is that the discontinuous mode of the RCD clamper flyback converters of the another preferred embodiment of the disclosure controls oscillogram;
Figure 10 is that the critical continuous conduction mode of the active clamp flyback converter of disclosure another embodiment controls waveform
Figure;
Figure 11 is that the voltage integrating meter of the RCD clamper flyback converters of disclosure another embodiment detects the one of control methods
A specific embodiment;
Figure 12 is that the turn-on time of the active clamp flyback converter of disclosure another embodiment detects control methods
One specific embodiment;
Figure 13 is what a reference value of the RCD clamper flyback converters of disclosure another embodiment changed with input voltage
One specific embodiment of setting method.
Figure 14 is that a reference value of the active clamp flyback converter of disclosure another embodiment changes with input voltage
Setting method a specific embodiment;And
Figure 15 is the flow chart of the control method of disclosure another embodiment.
Reference sign:
S1:Switching tube
S2:Clamper tube
t,t0,t1,t2,t3,t4,t5:Moment
SR:Synchronous rectifier
Lm:Magnetizing inductance
Im_n:Excitatory negative current
n:Turn ratio
Vo:Output voltage
Im_n(t):The amplitude of excitatory negative current
600,1100,1200,1300,1400:Control device
610,1110,1210:Flyback converter
620,1120,1220,1320,1420:Output voltage integral unit
630,1130,1230,1330,1430:Compare control unit
640,1140,1240,1340,1440:Excitatory negative current benchmark setup unit
1360,1460:Input voltage measurement unit
Im_N:A reference value
CEQ:Parasitic capacitance
T:Transformer
D1:Diode
Saux,Saux_VCC:Switch
Waux:Auxiliary winding
R1,R2,R3,R4,Rsense:Resistance
Isense:Current signal
Csense:Capacitance
Vsense:Voltage integrating meter signal
Co:Output capacitance
Vbus:Input voltage
Vbus_max:Input voltage maximum value
S1510,S1520,S1530:Step
Specific implementation mode
Embodying the exemplary embodiments of disclosure features and advantages will in detail describe in the explanation of back segment in conjunction with attached drawing.Ying Li
Solution to be the disclosure can have various variations, these variations all not to depart from the scope of the present disclosure in different embodiments,
And explanation therein and attached drawing be in itself when these variations of opposing illustrate, not for limiting the disclosure.
In addition, disclosure attached drawing is only schematic diagram, it is not necessarily drawn to scale.Identical label indicates phase in attached drawing
Same or similar part, thus will omit to its repeated description.Some block diagrams shown in attached drawing are functional entitys, not necessarily
It must be corresponding with physically or logically independent entity.Can realize these functional entitys with software, or at one or
These functional entitys are realized in multiple hardware modules or integrated circuit, or in heterogeneous networks and/or processor device and/or micro-control
These functional entitys are realized in device device processed.
Fig. 1 is a kind of circuit diagram of the active clamp flyback converter in technical solution.Active clamp flyback converter can
To realize primary side power switch tube S1No-voltage open (ZVS), existing control method is:Control clamper tube S2Only first
Grade side power switch tube S1A setting time, the t2-t3 in control oscillogram as shown in Figure 2 are connected before conducting.
Fig. 3 shows a kind of circuit diagram of the RCD clamper flyback converters in technical solution.RCD clamper flyback converters
Pass through the secondary side synchronous rectifier pipe S of turn on delay Emmitter diven quasiRTo realize primary side power switch tube S1Zero electricity
It presses off logical (ZVS), existing secondary side synchronous rectifier pipe SRTurn on delay control method be:Control synchronous rectifier SRSecondary
Grade side electric current isContinue that a setting time, the t1-t2 in control oscillogram as shown in Figure 4 is connected after dropping to zero.
Both the above realizes primary side power switch tube S1The method that no-voltage opens (ZVS) is synchronized by controlling
Rectifying tube SROr clamper tube S2It opens a setting time to realize, this is applicable for the application scenarios of fixed output voltage.
However, with the development of power supply adaptor, the especially promotion and popularization of USB-PD Type-C can be changed output electricity
The application of pressure becomes to become more and more popular.For the application scenarios of variable output voltage, above-mentioned control mode will be no longer applicable in, this is
Because:Either RCD clampers flyback converter or active clamp flyback converter realize primary side power switch tube zero
The basic principle that voltage opens (ZVS) is as follows:In primary side power switch tube S1Before opening so that the magnetizing inductance of transformer
LmOne excitatory negative current I of upper generationm_n, pass through excitatory negative current Im_nHelp to realize primary side power switch tube S1Zero electricity
Logical (ZVS) is pressed off, and the size of excitatory negative current is determined by following formula:
Wherein:LmIt is the magnetizing inductance value of transformer, n is the turn ratio of transformer, VoIt is the output voltage values of converter,
Im_n(t) be excitatory negative current amplitude, t is the turn-on time (synchronous rectification for Emmitter diven quasi of auxiliary switch
The turn on delay time is referred to for pipe, turn-on time is referred to for the clamper tube of active clamp flyback converter).
For a fixed design, magnetizing inductance value L it can be seen from above-mentioned formulamIt is fixed with turn ratio n.
If output voltage VoIt is fixed, by formula (1) it is found that fixed turn-on time t means fixed excitatory negative current width
Value, therefore, by controlling synchronous rectifier SROr clamper tube S2A setting time t is opened, for the application feelings of fixed output voltage
Shape is applicable.If output voltage is variable, fixed turn-on time means that excitatory negative current amplitude can be with output electricity
The variation of pressure and change.By taking the application of USB-PD Type-C as an example, minimum output voltage 5V, maximum output voltage is
If 20V can cause one in following two results using the control method of fixed turn-on time:
A:If the turn-on time set can meet primary side power switch tube zero electricity of the output voltage as 5V when just
The condition of logical (ZVS) is pressed off, then when output voltage is 20V, it is 5V that the excitatory negative current amplitude of generation, which will be output voltage,
When 4 times.Excessive excitatory negative current can introduce excess loss, influence the efficiency of converter.
B:If the turn-on time set can meet primary side power switch tube zero electricity of the output voltage as 20V when just
The condition of logical (ZVS) is pressed off, then when output voltage is 5V, only output voltage is by the excitatory negative current amplitude of generation
1/4 when 20V, it is open-minded that too small excitatory negative current amplitude can cause primary side power switch tube to can not achieve no-voltage.
Based on the above, in a preferred embodiment of the disclosure, a kind of control device is provided firstly, with reference to Fig. 6
Shown, for control device 600 for controlling flyback converter 610, wherein flyback converter 610 includes an auxiliary switch.Such as Fig. 6 institutes
Show, which may include:Output voltage integral unit 620 and compare control unit 630.Wherein:
Output voltage integral unit 620 obtains anti-for being integrated by the output voltage to flyback converter 610
The amplitude of excitatory negative current in exciting converter 610;And
Compare control unit 630 for carrying out the amplitude of the excitatory negative current obtained and an excitatory negative current a reference value
Compare, and controls the shutdown of auxiliary switch according to comparison result.
According to the control device 600 of the present embodiment, on the one hand, accumulated by the output voltage to flyback converter 610
Divide to obtain the amplitude of the excitatory negative current in flyback converter 610, can obtain in real time excitatory under different output voltages
The amplitude of negative current;On the other hand, the amplitude of the excitatory negative current obtained is compared with excitatory negative current a reference value, root
The shutdown that auxiliary switch is controlled according to comparison result, can realize that primary side is opened by reasonably setting excitatory negative current a reference value
It is open-minded to close no-voltage of the pipe under different output voltages.
In the present embodiment, flyback converter 610 further includes primary side switch unit, secondary side rectifier unit, transformer
With output capacitance (not shown), wherein primary side switch unit includes primary side power switch tube, and secondary side rectifier unit includes
First end and second end, first end and second end are electrically connected with transformer and output capacitance respectively.To be applicable in variable output electricity
The application scenarios of pressure realize in full input voltage range (such as 90~264Vac), the full-load range under different output voltages
The no-voltage of interior primary side power switch tube opens (ZVS), needs to control the amplitude of excitatory negative current up to a setting value.According to
Following formula (2):
It is found that by detecting output voltage VoWith the product of time t can the excitatory negative current of indirect detection amplitude, and it is defeated
Go out voltage VoPhysical significance with the product of time t is output voltage VoTime t is integrated.Therefore, the disclosure is substantially former
Reason is:Before primary side power switch tube is opened, by controlling turning on and off for auxiliary switch so that flyback converter
An excitatory negative current is generated in 610.Integration control is carried out by detecting output voltage, and to output voltage, it is excitatory negative to obtain
The information I of current amplitudem_n(t).Set the reference value I of excitatory negative currentm_N, it is somebody's turn to do when the amplitude of excitatory negative current is greater than or equal to
When a reference value, compare the output of control unit 630 control signal to turn off auxiliary switch.Then, it is first with this excitatory negative current
Initial value passes through magnetizing inductance LmWith the parasitic capacitance C of primary side circuitEQResonance realize the no-voltage of primary side power switch tube
It opens (ZVS).By the way that a reference value of excitatory negative current is rationally arranged, can in full input voltage range, different output voltages it is complete
Realize that the no-voltage of primary side power switch tube is opened (ZVS) in loading range.In this present embodiment, parasitic capacitance CEQBy first
The parasitic capacitance of the parasitic capacitance of grade side power switch tube S 1 and the primary side coil of transformer T is constituted.
It should be noted that in this embodiment, the output voltage of flyback converter 610 is variable, such as flyback converter
610 output voltage can be 5V, 9V, 15V or 20V etc., and the disclosure is to this without particular determination.
In addition, as shown in fig. 7, in the preferred embodiment of the disclosure, in order to reasonably set excitatory negative current a reference value,
Control device 600 can also include excitatory negative current benchmark setup unit 640, for the input electricity based on flyback converter 610
Pressure or/and output voltage set the excitatory negative current a reference value.
In addition, in certain embodiments, flyback converter 610 can be active clamp flyback converter as shown in Figure 1
Or RCD clamper flyback converters as shown in Figure 3 and Figure 5, but the flyback converter in disclosure preferred embodiment is not limited to
This.
Further, in certain embodiments, the auxiliary switch of flyback converter 610 can be clamper as shown in Figure 1
Pipe S2Or synchronous rectifier S as shown in Figure 3R, but the auxiliary switch in the preferred embodiment of the disclosure is without being limited thereto, such as
Secondary side as shown in Figure 5 is the RCD clamper flyback converters of diode rectification, and auxiliary switch can be to be parallel to diode D1
Switch SauxOr its auxiliary switch can be to be series at auxiliary winding WauxSwitch Saux_VCC.It should be noted that in this public affairs
It opens in preferred embodiment, control device 600 can be adapted for different operating modes, including discontinuous mode and critical continuous mode mould
Formula, the disclosure is to this without particular determination.
In some embodiments of the disclosure, the realization of voltage integrating meter function can there are many modes, such as may be used
Digital circuit can also use analog line.It is illustrated below herein with analog line.Voltage integrating meter electricity as shown in Figure 8
Road includes amplifier and resistance R1-R4To Rsense, but not limited to this.As long as by circuit theory it is found that meeting following formula:
Also that is, R1=R2, R3=R4,
It can obtain:
Due to RsenseFor known fixed, therefore formula (4) is i.e. by voltage signal VoIt is converted into current signal Isense.Electricity consumption
Flow signal IsenseTo a capacitance CsenseCharging, capacitance CsenseOn voltage i.e. be presented as output voltage VoIntegrated signal
It can obtain:
Due to CsenseAnd RsenseIt is known parameters, therefore by detecting output voltage VoIt can be obtained output voltage integral letter
Number Vsense。
Fig. 8 is the voltage integral circuit figure of disclosure another embodiment.As shown in Figure 8:Enable signal acts on out
Close pipe S1, and it is effective to be arranged to low level:When enable signal is high level, switching tube S1It is closed, integrates circuit not work at this time
Make;When enable signal is low level, switching tube S1It disconnects, integral circuit is started to work.Reset signal acts on switching tube S2,
And it is effective to be arranged to high level:When reset signal is low level, switching tube S2It disconnects, capacitance CsenseIt is electrically charged, with detection
Voltage integrating meter signal Vsense, integral circuit holding working condition;When reset signal is high level, switching tube S2It is closed, capacitance
CsenseIt is completely discharged, at this time voltage integrating meter signal VsenseIt is 0, integral circuit resets, and integrating circuit is stopped.In another
In embodiment, the significant level signal of integrated signal also can be high level, and the significant level signal of reset signal also can be low electricity
It is flat, it is not limited herein.In another embodiment, switching tube S1 and enable signal can need not be also set, same controllable integral
The working condition of circuit.
It should be noted that in certain embodiments, for discontinuous operating mode, the enable signal of integral unit can
It is obtained with open signal by auxiliary switch.As shown in Fig. 2, in t2 moment S2The rising edge skip signal of drive signal is
The open signal of auxiliary switch, as shown in figure 9, in the S at t2 momentRThe rising edge skip signal of drive signal is auxiliary switch
Open signal can obtain enable signal by detecting this rising edge skip signal.It should be noted that enable signal
Can be synchronous with this rising edge skip signal, can also be to do certain delay by the rising edge skip signal to obtain.
Further, in certain embodiments, for critical continuous conduction mode, the enable signal of integrating circuit can lead to
Spend zero crossing (such as Fig. 4, the t1 moment for detecting excitatory negative current;Such as Figure 10, t1 moment) it obtains.Specifically, can pass through
Excitatory negative current zero crossing is realized in current transformer, itself internal resistance of sample resistance or power device internal resistance such as auxiliary switch
Detection.
It should be noted that in certain embodiments, the reset signal of integral unit can pass through the shutdown of auxiliary switch
Signal (the t3 moment S of such as Fig. 22The failing edge skip signal of drive signal, such as the t2 moment S of Fig. 4RThe failing edge of drive signal is jumped
Varying signal, such as the t3 moment S of Fig. 9RThe failing edge skip signal of drive signal, such as the t2 moment S of Figure 102The decline of drive signal
Along skip signal) it obtains, such as can be synchronous with the cut-off signals of auxiliary switch, or the cut-off signals are centainly prolonged
It obtains late.
Figure 11 is an a kind of specific embodiment of control device.As shown in figure 11, control device 1100 is anti-for controlling
Exciting converter 1110, wherein control device 1100 include:Output voltage integral unit 1120 compares control unit 1130 and excitatory
Negative current benchmark setup unit 1140.Flyback converter 1110 is RCD clamper flyback converters, including primary side switch unit,
Secondary side rectifier unit, transformer T and output capacitance Co, wherein primary side switch unit includes primary side power switch tube S1,
Secondary side rectifier unit includes synchronous rectifier SR, and secondary side rectifier unit respectively with transformer T and output capacitance CoElectrically connect
It connects.In this present embodiment, flyback converter 1110 works in discontinuous mode.
In this embodiment, control device 1100 passes through synchronous rectifier SRSecond conducting open signal, such as Fig. 9 institutes
The t shown2The S at momentRDrive signal enables output voltage integral unit 1120 to obtain enable signal by enable signal;It is defeated
Go out output voltage signal V of the voltage integrating meter unit 1120 according to receptionoIt is integrated, according to formula (2) to obtain primary side line
Enclose the amplitude I of excitatory negative currentm_n, and be transported to and compare control unit 1130;Compare control unit 1130 by comparing sharp
Magnetic negative current amplitude Im_nWith the reference value I of excitatory negative current benchmark setup unit 1140m_N, wait for Im_nReach reference value Im_NWhen,
That is Im_nMore than or equal to reference value Im_NWhen, compare the output control signal of control unit 1130 to turn off synchronous rectifier SR.Together
When, compare control unit 1130 according to synchronous rectifier SRCut-off signals output reset signal it is single to reset output voltage integral
Member 1120.
Figure 12 is a kind of another specific embodiment of control device.As shown in figure 12, the control device 1200 is for controlling
Flyback converter 1210 processed, the control device 1200 include:Output voltage integral unit 1220 compares control unit 1230 and swashs
Magnetic negative current benchmark setup unit 1240.Flyback converter 1210 is active clamp flyback converter, including primary side switch list
Member, secondary side rectifier unit, transformer T and output capacitance Co, wherein primary side switch unit includes primary side power switch tube
S1With clamper tube S2, secondary side rectifier unit includes synchronous rectifier SR, and secondary side rectifier unit respectively with transformer T and defeated
Go out capacitance CoElectrical connection.In this present embodiment, flyback converter works in discontinuous mode.
In this embodiment, control device 1200 is by clamper tube S2Open signal, such as the S at the t2 moment of Fig. 22It is open-minded
Signal, to obtain integral unit enable signal, enable signal is for enabling output voltage integral unit 1220;Output voltage signal
VoIt is transported to output voltage integral unit 1220;Output voltage integral unit 1220 is according to output voltage signal VoIt is integrated, with
Obtain the amplitude I of the excitatory negative current of primary side coilm_n, and be transported to and compare control unit 1230;Compare control unit
1230 by comparing excitatory negative current amplitude Im_nWith the reference value I of excitatory negative current benchmark setup unit 1240m_N, wait for Im_nIt reaches
To reference value Im_NWhen, compare the output control signal of control unit 1230 to turn off clamper tube S2.Compare control unit 1230 simultaneously
According to clamper tube S2Cut-off signals export integral unit reset signal to reset output voltage integral unit 1220.
For the setting of excitatory negative current a reference value, through known to research:(V is inputted in low pressurebus<nVo) when, without excitatory
The help of negative current, you can realize that the no-voltage of primary side power tube is opened (ZVS);In high input voltage (Vbus>nVo) when, in order to
Realize that the no-voltage of primary side power tube is opened (ZVS), the minimum amplitude of excitatory negative current needs to meet:
According to above-mentioned formula (7), for a specific circuit design, turn ratio n, the magnetizing inductance sensibility reciprocal of transformer
LmAnd parasitic capacitance capacitance CEQIt is fixed, in order to realize that the no-voltage of primary side power tube is opened (ZVS), excitatory negative current
Reference value Im_NWith input voltage VbusWith output voltage VOIt is related.Excitatory negative current benchmark setup unit can be based on anti-as a result,
The input voltage V of exciting converterbusWith output voltage VOExcitatory negative current reference value I is adjusted in real timem_N。
However, using the above method, in order to adjust excitatory negative current reference value I in real timem_N, need two changes of real time monitoring
Amount:Input voltage VbusWith output voltage VO, such way can increase the complexity of control.Further known to research:Inverse-excitation converting
Device is in high input voltage (Vbus>nVo) in the case of when working, influence of the output voltage for excitatory negative current a reference value can be ignored,
The a reference value of i.e. excitatory negative current is only related with input voltage, to enormously simplify the setting of excitatory negative current a reference value.
In some embodiments, the setting for excitatory negative current a reference value can have the following two kinds setting method:
Fixed reference value setting method:No-voltage to realize primary side power switch tube in full input voltage range is open-minded
(ZVS), a reference value of excitatory negative current is set by maximum input voltage, i.e.,:
Wherein:Vbus_maxFor input voltage maximum value.
For fixed reference value setting method, when input voltage is maximum value Vbus_maxWhen, primary side can be met just
The no-voltage of power switch tube is opened (ZVS);But when input voltage is low-voltage, excitatory negative electricity caused by the control method
The amplitude that stream Amplitude Ration primary side power tube no-voltage opens the excitatory negative current needed for (ZVS) is big, thus can bring additional
Loss, is unfavorable for efficiency optimization.Certainly, it be not that the setting of fixed reference value may be used in very high application scenario to efficiency requirements
Method.
The application scenario relatively high to efficiency requirements can adopt the setting that excitatory negative current a reference value changes with input voltage
Method optimizes the efficiency of converter.Therefore, can be by excitatory negative current reference value:
Wherein:Im_N(Vbus) it is excitatory negative current a reference value.
For a specific circuit design, magnetizing inductance sensibility reciprocal LmWith parasitic capacitance capacitance CEQIt is fixed, by above-mentioned
Formula (10) is it is found that excitatory negative current a reference value and input voltage VbusDirectly proportional, excitatory negative current benchmark setup unit can basis
The input voltage value V that input voltage measurement unit detectsbus, directly calculate excitatory negative current reference value Im_N。
Figure 13 is a kind of another specific embodiment of control device.Figure 13 is similar with the structure of Figure 11, but Figure 13 is also wrapped
A specific example containing excitatory negative current benchmark setup unit.Shown in Figure 13, control device 1300 also includes that input voltage is examined
Unit 1360 is surveyed, in this present embodiment, input voltage measurement unit 1360 includes first resistor R1With second resistance R2, and pass through
First resistor R1With second resistance R2The mode of partial pressure detects input voltage information Vbus.Excitatory negative current benchmark setup unit
1340 receive the input voltage information V from input voltage measurement unit 1360bus, for setting excitatory negative current a reference value
Im_N, which, which is transported to, compares control unit 1330;Output voltage integral unit 1320 is according to the defeated of input
Go out voltage signal to be integrated, to obtain the amplitude I of the excitatory negative current of primary side coilm_n, and be transported to and compare control list
Member 1330.Compare control unit 1330 by comparing the excitatory negative current amplitude I obtained from output voltage integral unit 1320m_n
With the excitatory negative current reference value I of excitatory negative current benchmark setup unit 1340m_N, wait for Im_nReach excitatory negative current a reference value
Im_NWhen, compare the output control signal of control unit 1330 to turn off synchronous rectifier SR, while exporting integral unit reset signal
To reset output voltage integral unit 1320.At the same time, by the secondary conducting open signal of synchronous rectifier (when Fig. 9, t2
The S at quarterRDrive signal) integral unit enable signal is obtained, output voltage integral unit 1320 is enabled by enable signal.
Figure 14 shows a kind of another specific embodiment of control device.Figure 14 is similar with the structure of Figure 11, but Figure 14
Also include a specific example of excitatory negative current benchmark setup unit.Shown in Figure 14, control device 1400 also includes input electricity
Detection unit 1460 is pressed, in this present embodiment, input voltage measurement unit 1460 includes first resistor R1With second resistance R2, and
Input voltage information V is detected by electric resistance partial pressure modebus.Input voltage measurement unit 1460 is by input voltage information VbusIt is defeated
Enter to excitatory negative current benchmark setup unit 1440 for setting a reference value;By clamper tube S2Open signal it is single to obtain integral
First enable signal enables output voltage integral unit 1420 by enable signal;Output voltage signal Vo is transported to output voltage
Integral unit 1420;Output voltage integral unit 1420 is integrated according to the output voltage signal of input, to obtain primary side
The amplitude I of coil excitation negative currentm_n, and be transported to and compare control unit 1430;Compare control unit 1430 by comparing
The excitatory negative current amplitude I obtained from output voltage integral unit 1420m_nWith the base of excitatory negative current benchmark setup unit 1440
Quasi- value Im_N, wait for Im_nReach reference value Im_NWhen, compare the output control signal of control unit 1430 to turn off clamper tube S2, simultaneously
Integral unit reset signal is exported to reset output voltage integral unit 1420.
In addition, in disclosure preferred embodiment, additionally provide a kind of control method, the control method can be applied to as
Flyback converter shown in Fig. 6-Figure 14, which includes an auxiliary switch, and referring to Fig.1 shown in 5, control method can be with
Include the following steps:
Step S1510:It is integrated by the output voltage to flyback converter excitatory in flyback converter to obtain
The amplitude of negative current;
Step S1520:The amplitude of the excitatory negative current obtained is compared with excitatory negative current a reference value;And
Step S1530:The shutdown of auxiliary switch is controlled to realize the primary side power of flyback converter according to comparison result
The no-voltage of switching tube is open-minded.
Control method according to this embodiment, on the one hand, integrated by the output voltage to flyback converter to obtain
The amplitude for obtaining the excitatory negative current in flyback converter, can obtain the width of the excitatory negative current under different output voltages in real time
Value;On the other hand, the amplitude of the excitatory negative current obtained is compared with excitatory negative current a reference value, according to comparison result
The shutdown of auxiliary switch is controlled, can be realized in full input voltage range by reasonably setting excitatory negative current a reference value
No-voltage of (such as 90~264Vac) the primary side switch pipe under different output voltages is open-minded.
Further, in certain embodiments, which can also include:By the width of the excitatory negative current obtained
Value is compared with excitatory negative current a reference value, the control auxiliary when amplitude of excitatory negative current is more than excitatory negative current a reference value
Switch-off.
Further, in certain embodiments, which can also include:Input voltage based on flyback converter
Set excitatory negative current a reference value.
Further, in certain embodiments, the input voltage based on flyback converter sets excitatory negative current a reference value
May include:The maximum value of input voltage based on flyback converter sets excitatory negative current a reference value.
In addition, in certain embodiments, which can also include:Input voltage based on the flyback converter
Excitatory negative current a reference value is set with the output voltage of flyback converter.
It should be noted that in certain embodiments, flyback converter is that RCD clampers flyback converter or active clamp are anti-
Exciting converter.
It should be noted that in certain embodiments, the operating mode of flyback converter is discontinuous mode or critical continuous mode
Pattern.
It should be noted that in certain embodiments, auxiliary switch is synchronous rectifier, clamper tube or is connected in parallel on flyback
Switch on the secondary side rectifier unit of converter.
Further, in certain embodiments, carrying out integral to the output voltage of flyback converter includes:In response to enabled
Signal starts to integrate the output voltage of flyback converter by integrating circuit, and in response to a reset signal to integral
Circuit is resetted.
Further, in certain embodiments, under discontinuous mode, described make is obtained by the open signal of auxiliary switch
It can signal;And under critical continuous conduction mode, the zero crossing by detecting excitatory negative current obtains enable signal.
Further, in certain embodiments, pass through itself internal resistance of current transformer, sample resistance or auxiliary switch
To detect the zero crossing of excitatory negative current.
Further, in certain embodiments, reset signal is obtained by the cut-off signals of auxiliary switch.
Further, in certain embodiments, realize that the no-voltage of the primary side power switch tube of flyback converter is open-minded
Including:Realize that the primary side power of flyback converter is opened by the resonance of magnetizing inductance and parasitic capacitance in flyback converter
The no-voltage for closing pipe is open-minded.
Those skilled in the art will readily occur to the other of the disclosure after considering specification and invention of the disclosure
Embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or suitable
The variation of answering property follows the general principles of this disclosure and includes the undocumented prior art in the art of the disclosure.And this
Disclosed the description and examples are only to be considered as illustrative, and the scope of the present invention is determined by appended claims.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (29)
1. a kind of control device, is applied to flyback converter, the flyback converter includes an auxiliary switch, the control device
Including:
Output voltage integral unit obtains the flyback for being integrated by the output voltage to the flyback converter
The amplitude of excitatory negative current in converter;And
Compare control unit, for the amplitude of the excitatory negative current obtained to be compared with an excitatory negative current a reference value,
And the shutdown of the auxiliary switch is controlled according to comparison result.
2. control device as described in claim 1, which is characterized in that the auxiliary switch is synchronous rectifier, clamper tube, simultaneously
The switch that is associated on the secondary side rectifier unit of the flyback converter or the auxiliary winding for being series at the flyback converter
Switch.
3. control device as described in claim 1, which is characterized in that the operating mode of the flyback converter is discontinuous mode
Or critical continuous conduction mode.
4. control device as claimed in claim 3, which is characterized in that integrated to the output voltage of the flyback converter
Including:Start the output voltage integral unit by an enable signal, and by a reset signal to the output voltage
Integral unit is resetted.
5. control device as claimed in claim 4, which is characterized in that under discontinuous mode, by detecting the auxiliary switch
Open signal obtain the enable signal;And under critical continuous conduction mode, by the zero passage for detecting the excitatory negative current
Point obtains the enable signal.
6. control device as claimed in claim 5, which is characterized in that the zero crossing of the detection excitatory negative current includes:It is logical
Itself internal resistance of overcurrent mutual inductor, sample resistance or the auxiliary switch detects the zero crossing of the excitatory negative current.
7. control device as claimed in claim 4, which is characterized in that the cut-off signals by detecting the auxiliary switch obtain
The reset signal.
8. control device as described in claim 1, which is characterized in that the relatively control unit, in described excitatory negative
When the amplitude of electric current is greater than or equal to the excitatory negative current a reference value, the shutdown of the auxiliary switch is controlled.
9. control device as described in claim 1, which is characterized in that the flyback converter is RCD clamper flyback converters
Or active clamp flyback converter.
10. control device as described in claim 1, which is characterized in that the control device further includes:
First excitatory negative current benchmark setup unit, it is described excitatory negative for the input voltage setting based on the flyback converter
Current reference value.
11. control device as described in claim 1, which is characterized in that the control device further includes:
Second excitatory negative current benchmark setup unit is used for the input voltage based on the flyback converter and the inverse-excitation converting
The output voltage of device sets the excitatory negative current a reference value.
12. control device as described in claim 1, which is characterized in that the output voltage of the flyback converter is variable.
13. control device as claimed in claim 12, which is characterized in that the output voltage of the flyback converter be 5V, 9V,
15V or 20V.
14. a kind of Switching Power Supply, which is characterized in that including any control device in claim 1-13.
15. a kind of control method, is applied to flyback converter, the flyback converter includes an auxiliary switch, which is characterized in that
The control method includes:
It is integrated by the output voltage to the flyback converter to obtain the excitatory negative current in the flyback converter
Amplitude;
The amplitude of the excitatory negative current obtained is compared with an excitatory negative current a reference value;And
The shutdown of the auxiliary switch is controlled according to comparison result to realize the primary side power switch tube of the flyback converter
No-voltage it is open-minded.
16. control method as claimed in claim 15, which is characterized in that the auxiliary switch be synchronous rectifier, clamper tube,
The switch that is connected in parallel on the secondary side rectifier unit of the flyback converter or the auxiliary winding for being series at the flyback converter
Switch.
17. control method as claimed in claim 15, which is characterized in that the operating mode of the flyback converter is interrupted mould
Formula or critical continuous conduction mode.
18. control method as claimed in claim 17, which is characterized in that accumulated to the output voltage of the flyback converter
Divide and includes:
Start to integrate the output voltage of the flyback converter by an integral circuit in response to an enable signal, and
The integral circuit is resetted in response to a reset signal.
19. control method as claimed in claim 18, which is characterized in that under discontinuous mode, opened by detecting the auxiliary
The open signal of pass obtains the enable signal;And under critical continuous conduction mode, by the mistake for detecting the excitatory negative current
Zero obtains the enable signal.
20. control method as claimed in claim 19, which is characterized in that pass through current transformer, sample resistance or described
Itself internal resistance of auxiliary switch detects the zero crossing of the excitatory negative current.
21. control method as claimed in claim 18, which is characterized in that obtain institute by the cut-off signals of the auxiliary switch
State reset signal.
22. control method as claimed in claim 15, which is characterized in that realize that the primary side power of the flyback converter is opened
Close pipe no-voltage open including:
The flyback converter is realized by the resonance of a magnetizing inductance and a parasitic capacitance in the flyback converter
The no-voltage of primary side power switch tube is open-minded.
23. control method as claimed in claim 15, which is characterized in that control the pass of the auxiliary switch according to comparison result
Break and also includes to realize that the no-voltage of the primary side power switch tube of the flyback converter is opened:
When the amplitude of the excitatory negative current is greater than or equal to the excitatory negative current a reference value, the auxiliary switch is controlled
Shutdown.
24. control method as claimed in claim 15, which is characterized in that the flyback converter is RCD clamper inverse-excitation convertings
Device or active clamp flyback converter.
25. control method as claimed in claim 15, which is characterized in that the control method further includes:
Input voltage based on the flyback converter sets the excitatory negative current a reference value.
26. control method as claimed in claim 25, which is characterized in that the input voltage setting based on the flyback converter
The excitatory negative current a reference value includes:
The maximum value of input voltage based on the flyback converter sets the excitatory negative current a reference value.
27. control method as claimed in claim 15, which is characterized in that the control method further includes:
The output voltage of input voltage and the flyback converter based on the flyback converter sets the excitatory negative current
A reference value.
28. control method as claimed in claim 15, which is characterized in that the output voltage of the flyback converter is variable.
29. control method as claimed in claim 28, which is characterized in that the output voltage of the flyback converter be 5V, 9V,
15V or 20V.
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| CN202110747540.6A CN113595399A (en) | 2017-04-10 | 2017-06-30 | Control device and control method |
| TW106127166A TWI664801B (en) | 2017-04-10 | 2017-08-10 | Switching power, control apparatus and control method |
| US15/944,815 US10333418B2 (en) | 2017-04-10 | 2018-04-04 | Control device and control method |
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| CN110531219A (en) * | 2019-09-05 | 2019-12-03 | 上海芯荃微电子科技有限公司 | A kind of exchange detection method and circuit using switch drain |
| CN110798075A (en) * | 2019-11-08 | 2020-02-14 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and switching converter using same |
| CN111464036A (en) * | 2019-07-05 | 2020-07-28 | 西安矽力杰半导体技术有限公司 | Switch state control method, control circuit and flyback converter |
| CN112701882A (en) * | 2020-12-22 | 2021-04-23 | 杰华特微电子（杭州）有限公司 | Control circuit and control method of flyback converter |
| CN112713778A (en) * | 2019-10-24 | 2021-04-27 | 立锜科技股份有限公司 | Switching control circuit and method for controlling flyback power supply circuit |
| CN112994465A (en) * | 2021-02-08 | 2021-06-18 | 康舒科技股份有限公司 | Power supply device and control method thereof |
| CN113131747A (en) * | 2021-03-16 | 2021-07-16 | 广州金升阳科技有限公司 | Flyback converter control method and control device thereof |
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| CN112701882A (en) * | 2020-12-22 | 2021-04-23 | 杰华特微电子（杭州）有限公司 | Control circuit and control method of flyback converter |
| CN112994465A (en) * | 2021-02-08 | 2021-06-18 | 康舒科技股份有限公司 | Power supply device and control method thereof |
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Also Published As
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|---|---|
| CN113595399A (en) | 2021-11-02 |
| TWI664801B (en) | 2019-07-01 |
| TW201838309A (en) | 2018-10-16 |
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