CN108199565A - A kind of prebias control circuit and prebias control method - Google Patents
A kind of prebias control circuit and prebias control method Download PDFInfo
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- CN108199565A CN108199565A CN201810084133.XA CN201810084133A CN108199565A CN 108199565 A CN108199565 A CN 108199565A CN 201810084133 A CN201810084133 A CN 201810084133A CN 108199565 A CN108199565 A CN 108199565A
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- 238000012935 Averaging Methods 0.000 claims abstract description 44
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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
- 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
- H02M1/36—Means for starting or stopping converters
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a kind of prebias control circuit and prebias control methods, applied to synchronous rectification power inverter, the present invention is identical with the rectifying tube driving signal frequency of synchronous rectification by the phase shift duplicate circuit in prebias control circuit and negater circuit generation one, delayed phase, high level part is mutually superimposed, and the basically identical signal of pulse width of non-superimposed part, the signal produced after prebias Signal averaging driving circuit one it is identical with the rectifying tube driving signal frequency of synchronous rectification, the consistent signal of duty ratio, new drive signal of the signal as synchronous freewheeling pipe.Therefore, avoiding continued flow tube, usually because duty ratio is in, the anti-filling of outlet side pre-bias voltage source energy caused by maximum value and reverse current are excessive to cause synchronous freewheeling tube failure, power inverter to start failure, damage and repeated the fatal problems such as machine on startup, it is achieved thereby that prebias controls startup.
Description
Technical field
The present invention relates to DC/DC supply convertor synchronous rectification actuation techniques field, more particularly to a kind of prebias control
Circuit processed and prebias control method.
Background technology
In DC/DC converter technical fields, generally using synchronous rectification, to promote transfer efficiency.And prebias skill
Art solution is the technical issues of synchronous rectification must face.In the synchronous rectification side of the converters such as normal shock, flyback
In case, since the pwm control circuit of primary side can generally take soft-start circuit, then DC/DC synchronous rectifier converters is caused to open
In dynamic process, main duty ratio is gradually spread out, and is changed from small to big, i.e., the duty ratio of rectifying tube is gradually increased by very small value, but
Since the drive signal of rectifying tube and continued flow tube is complementary relationship, then the duty ratio of continued flow tube is from becoming smaller greatly.
At this time if adding bias voltage in outlet side, will appear because the duty ratio of continued flow tube is led much larger than rectifying tube
It causes bias voltage can be by afterflow tube discharge, and then reverse current occurs, eventually lead to the synchronous rectification tube failure of converter, i.e.,
Prebias plays machine problem；Another situation also results in prebias above and plays machine problem, i.e., higher (such as in output voltage
More than 12V) when, DC/DC synchronous rectifier converters are during startup and shutdown, since DC/DC synchronous rectifier converters export
Capacitance is generally bigger, when DC/DC synchronous rectifier converter output no-loads, then DC/DC synchronous rectifier converters output capacitance
Electric energy be difficult to bleed off, i.e., output voltage is higher, and the energy in output capacitance is bigger；When DC/DC synchronous rectifier converters export
When electric energy on capacitance is not bled off, if DC/DC synchronous rectifier converters start at this moment, since the service time of continued flow tube is remote
More than rectifying tube, so the electric energy on capacitance can cause DC/DC same by the afterflow tube discharge of DC/DC synchronous rectifier converters
The electric energy of step rectifier converter toward load conveying is much smaller than output capacitance toward the electric energy to discharge in DC/DC synchronous rectifier converters,
There is the serious anti-sink current of output, while the output voltage of DC/DC synchronous rectifier converters is caused to establish failure, serious meeting
Power module is caused to damage or fail, the not serious DC/DC synchronous rectifier converters that will also result in play machine failure, short so as to trigger
It protects on road so that rear class equipment is constantly restarted, and influences the reliability of rear class equipment.
Invention content
It is an object of the invention to propose a kind of prebias control circuit and prebias control method, to realize using synchronization
Rectifier converter continued flow tube in start-up course occurs that output current is counter to be filled, and synchronous rectifier converter is caused to start failure, damage
The problem of with machine has been repeated.
In order to achieve the above objectives, the present invention provides following technical schemes：
A kind of prebias control circuit, applied to synchronous rectification power inverter, the synchronous rectification power inverter is
Single-end ortho-exciting synchronous rectification topology, it is former that the synchronous rectification power inverter includes rectifying tube driving signal output end, continued flow tube
Beginning driving signal output end and the new driving signal input of continued flow tube, the rectifying tube driving signal output end are used to export secondary
Synchronous rectification drive signal DRIVER_A, while one of input signal as the prebias control circuit, the afterflow
Original drive signal DRIVER_B is managed for another input signal as the prebias control circuit, the secondary
The original drive signal DRIVER_B of the continued flow tube of synchronous rectification drive signal DRIVER_A and the secondary is complementary relationship, described
Prebias control circuit includes：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit, prebias signal screen
Circuit is covered, wherein：
The input terminal of the phase shift duplicate circuit is connected with the rectifying tube driving signal output end, the prebias signal
The first input end of superposition driving circuit is connected with the original driving signal output end of the continued flow tube；
The output terminal of the phase shift duplicate circuit is connected with the first input end of the negater circuit, the negater circuit
Output terminal is connected with the second input terminal of the prebias Signal averaging driving circuit, the prebias Signal averaging driving circuit
Output terminal be connected with the new driving signal input of the continued flow tube；
The input terminal of the prebias signal shielding circuit is connected with the output terminal of the synchronous rectification power inverter, institute
The output terminal for stating prebias signal shielding circuit is connected with the second input terminal of the negater circuit；
The synchronous rectification drive signal DRIVER_A of the secondary inputs the phase shift duplicate circuit, generates a frequency phase
Same reverse signal, the synchronous rectification of the low level retention time slightly larger than the secondary in each period of the reverse signal are driven
The high level width of dynamic signal DRIVER_A, the reverse signal input the negater circuit, generate one and the reversed letter
The reverse signal of number phase complements；
The prebias Signal averaging driving circuit is by the original drive signal DRIVER_B of the synchronous freewheeling pipe of the secondary
A new drive signal is generated with after the superposition of the output signal of the negater circuit, as the new drive signal of the continued flow tube,
Drive the continued flow tube of the synchronous rectification power inverter；
The input signal of the prebias signal shielding circuit is the output voltage of the synchronous rectification power inverter, when
When the synchronous rectification power inverter is completed to start, described one disable signal of prebias signal shielding circuit output, by institute
State the output signal shielding of negater circuit.
Preferably, the phase shift duplicate circuit includes：First diode, the first capacitance, second resistance, the 5th resistance,
Two switching tubes, the 4th switching tube and the first operational amplifier, wherein：
The anode of first diode is connected with the grid of the second switch pipe, and common end is answered as the phase shift
The input terminal of circuit processed is connected with the rectifying tube driving signal output end；
The cathode of first diode is connected with one end of the second resistance, the other end of the second resistance and institute
State the 4th resistance, first capacitance is connected with the common end of the inverting input of first operational amplifier, common end
Input X_C signals；
The other end of 4th resistance is connected with the drain electrode of the 4th switching tube, the grid of the 4th switching tube with
5th resistance is connected with the common end of the second switch pipe, the other end and the first power supply phase of the 5th resistance
Even, the other end of the source electrode of the second switch pipe, the source electrode of the 4th switching tube and first capacitance with publicly
End is connected；
The normal phase input end of first operational amplifier is connected with the first reference voltage, first operational amplifier
Ground terminal is connected with the common, and the power input of first operational amplifier is connected with the second power supply, will
The X_C signals generate X_D signals compared with first reference voltage, and the output terminal of first operational amplifier is as institute
The output terminal for stating phase shift duplicate circuit is connected with the first input end of the negater circuit.
Preferably, the second switch pipe and the 4th switching tube are NMOS switch pipe.
Preferably, the negater circuit includes：3rd resistor and first switch pipe, wherein：
One end of the 3rd resistor is defeated as first input end and the phase shift duplicate circuit of the negater circuit
Outlet is connected, and the other end of the 3rd resistor is connected with the grid of the first switch pipe, and common end is as described reversed
Second input terminal of circuit is connected with the output terminal of the prebias signal shielding circuit；
The source electrode of the first switch pipe is connected with the common, and X_F is exported from the drain electrode of the first switch pipe
Signal, and driven the drain electrode of the first switch pipe as the output terminal of the negater circuit with the prebias Signal averaging
Second input terminal of circuit is connected.
Preferably, the first switch pipe is NMOS switch pipe.
Preferably, the prebias Signal averaging driving circuit includes：First resistor, the 6th resistance, the 7th resistance, second
Diode, third diode and third switching tube, wherein：
The common end of the first resistor and the 6th resistance as the prebias Signal averaging driving circuit the
Two output terminals are connected with the output terminal of the negater circuit；
The other end of the first resistor is connected with first power supply, the other end of the 6th resistance with it is described
The cathode of third diode is connected with the common end of the grid of the third switching tube；
The anode of the third diode is connected with the source electrode of the third switching tube, and common end is as the prebias
The output terminal of Signal averaging driving circuit is connected with the new driving signal input of the continued flow tube；
The drain electrode of the third switching tube is connected with the 7th resistance, the other end and described second of the 7th resistance
The cathode of diode is connected, and the anode of second diode is inputted as the first of the prebias Signal averaging driving circuit
End is connected with the original driving signal output end of continued flow tube of the synchronous rectification power inverter.
Preferably, the third switching tube is NMOS switch pipe.
Preferably, the prebias signal shielding circuit includes：8th resistance, the 9th resistance, the tenth resistance, the second electricity
Appearance, third capacitance, second operational amplifier and the 4th diode, wherein：
Input terminal and the synchronous rectification work(of the one end of 9th resistance as the prebias signal shielding circuit
The output terminal of rate converter is connected, the other end of the 9th resistance and second capacitance, the 8th resistance and described
The inverting input of second operational amplifier is connected, the other end and institute of the other end of second capacitance with the 8th resistance
Common is stated to be connected；
One end of tenth resistance is connected with the second reference voltage, the other end and the third electricity of the tenth resistance
Appearance is connected with the normal phase input end of the second operational amplifier, the other end of the third capacitance and the common phase
Even；
The output terminal of the second operational amplifier is connected with the cathode of the 4th diode, common end output X_E
Signal, the anode of the 4th diode as output terminal and the negater circuit of the prebias signal shielding circuit the
Two input terminals are connected.
A kind of prebias control method, applied to the prebias control circuit described in above-mentioned any one, the prebias control
Circuit processed is applied to synchronous rectification power inverter, and the synchronous rectification power inverter is opened up for single-ended whole positive exciting synchronous rectification
Flutter, the synchronous rectification power inverter include rectifying tube driving signal output end, the original driving signal output end of continued flow tube and
The new driving signal output end of continued flow tube, the rectifying tube driving signal output end are used to export the synchronous rectification drive signal of secondary
DRIVER_A, while one of input signal as the prebias control circuit, the original drive signal of continued flow tube
DRIVER_B is for another input signal as the prebias control circuit, the synchronous rectification driving letter of the secondary
The original drive signal DRIVER_B of continued flow tube of number DRIVER_A and the secondary are complementary relationship, the prebias control circuit
Including：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit, prebias signal shielding circuit, it is described pre- inclined
Control method is put to include：
The synchronous rectification power inverter starting state identification, i.e., output voltage is established from beginning setting up to completing；
In the synchronous rectification power converters device start-up course, by the synchronous rectification drive signal of the secondary
DRIVER_A generates the identical reverse signal of a frequency, each period of the reverse signal by the phase shift duplicate circuit
The low level retention time slightly larger than the secondary synchronous rectification drive signal DRIVER_A high level width, it is described reversely
Signal inputs the negater circuit, generates a reverse signal with the reverse signal phase complements；
The prebias Signal averaging driving circuit is by the original drive signal DRIVER_B of the synchronous freewheeling pipe of the secondary
With the output signal of the negater circuit, a new drive signal is generated after superposition, as the new drive signal of the continued flow tube,
Drive the continued flow tube of the synchronous rectification power inverter；
At the end of the synchronous rectification power converters device starts, the prebias signal shielding circuit passes through inspection
The output voltage of the synchronous rectification power inverter is surveyed, it is described pre- when the synchronous rectification power inverter is completed to start
Offset signal screened circuit exports a disable signal, and the output signal of the negater circuit is shielded；
At the end of the synchronous rectification power converters device starts, prebias control function terminates, the synchronization
Continued flow tube drive signal is directly from the original driving signal output end of the continued flow tube, so as to which entire circuit is according to original state
It starts to work, the drive signal of practical rectifying tube and continued flow tube restores complementary relationship, and the synchronous rectification power inverter starts
Normal work.
It can be seen via above technical scheme that compared with prior art, the invention discloses a kind of prebias control circuits
And prebias control method, applied to synchronous rectification power inverter, which includes：Phase shift duplicate circuit,
Negater circuit, prebias Signal averaging driving circuit and prebias signal shielding circuit, the present invention control electricity by prebias
Phase shift duplicate circuit in road and negater circuit generate one it is identical with the rectifying tube driving signal frequency of synchronous rectification, phase it
Afterwards, high level part is mutually superimposed, and the basically identical signal of pulse width of non-superimposed part, the signal are believed by prebias
A, duty ratio consistent letter identical with the rectifying tube driving signal frequency of synchronous rectification is produced after number superposition driving circuit
Number, and the failing edge same-phase of the rising edge of the signal and the rectifying tube drive signal of synchronous rectification.The signal is continuous as synchronizing
The new drive signal of flow tube.Therefore, continued flow tube is avoided on startup usually because duty ratio exports caused by being in maximum value
Side pre-bias voltage source energy, which instead fills, and reverse current is excessive causes synchronous freewheeling tube failure, power inverter to start failure, damage
Badly and the fatal problems such as machine are repeated, it is achieved thereby that prebias control starts.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of prebias control circuit structural representation that the embodiment of the present invention one provides；
Fig. 2 is the principle schematic of synchronous rectification power inverter provided by Embodiment 2 of the present invention；
Fig. 3 is prebias control circuit principle schematic provided by Embodiment 2 of the present invention；
Fig. 4 is the timing waveform that continued flow tube drive signal G2 provided by Embodiment 2 of the present invention is generated；
Fig. 5 is the principle schematic of synchronous rectification power inverter that the embodiment of the present invention three provides；
Fig. 6 is the prebias control circuit principle schematic that the embodiment of the present invention three provides；
Fig. 7 is a kind of prebias control method flow diagram that the embodiment of the present invention four provides.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
The machine of rising be exactly power supply since powering on, process that output voltage rises to rated value by 0.It is exactly same that prebias, which plays machine,
The output for walking unregulated power converter adds a voltage source higher than rated output voltage, such as 5.5V, if module is specified defeated
Go out is 5V, then in start-up course of the output voltage from 0 to 5V, since outside 5.5V voltage sources exist, electric current can be caused to fall
Stream, and there are various problems.When output plus a big capacitance, if the electricity on capacitance is not put it clean, synchronous rectification at this time
Power inverter restarts, and also will appear same anti-electric problem.
Embodiment one
Shown in Figure 1, an embodiment of the present invention provides a kind of prebias control circuits, are applied to synchronous rectification power
Converter 101, synchronous rectification power inverter 101 are single-end ortho-exciting synchronous rectification topology, and synchronous rectification power inverter 101 wraps
Include the original driving signal output end of rectifying tube driving signal output end, continued flow tube and the new driving signal input of continued flow tube, rectification
Pipe driving signal output end is used to export the synchronous rectification drive signal DRIVER_A of secondary, while is controlled as the prebias
In addition one of input signal of circuit, the original drive signal DRIVER_B of continued flow tube are used for as the prebias control circuit
One input signal, the synchronous rectification drive signal DRIVER_A of secondary and the original drive signal DRIVER_B of the continued flow tube of secondary
For complementary relationship, then prebias control circuit includes：Phase shift duplicate circuit 102, negater circuit 103, prebias Signal averaging drive
Dynamic circuit 104, prebias signal shielding circuit 105, wherein：
As shown in Figure 1, the input terminal of phase shift duplicate circuit 102 is connected with rectifying tube driving signal output end, prebias letter
The first input end of number superposition driving circuit 104 is connected with the original driving signal output end of continued flow tube；Phase shift duplicate circuit 102
Output terminal is connected with the first input end of negater circuit 103, output terminal and the prebias Signal averaging driving electricity of negater circuit 103
Second input terminal on road 104 is connected, and output terminal and the new drive signal of continued flow tube of prebias Signal averaging driving circuit 104 input
End is connected；The input terminal of prebias signal shielding circuit 105 is connected with the output terminal of synchronous rectification power inverter 101, pre- inclined
The output terminal of confidence screened circuit 105 is connected with the second input terminal of negater circuit 103.
Specifically, the synchronous rectification drive signal DRIVER_A input phase shifts duplicate circuit 102 of secondary, generates a frequency
Identical reverse signal, the synchronous rectification driving of the low level retention time slightly larger than secondary in each period of the reverse signal are believed
The reverse signal is inputted negater circuit 103 by the high level width of number DRIVER_A, generate one it is mutual with the reverse signal phase
The reverse signal of benefit, prebias Signal averaging driving circuit is by the original drive signal DRIVER_B of the synchronous freewheeling pipe of secondary and instead
A new drive signal is generated after the output signal superposition of circuit 103, as the new drive signal of the continued flow tube, drives institute
State the continued flow tube of synchronous rectification power inverter；The input signal of prebias signal shielding circuit 105 becomes for synchronous rectification power
The output voltage of parallel operation 101, when synchronous rectification power inverter 101 is completed to start, prebias signal shielding circuit 105 exports
One disable signal shields the output signal of negater circuit 103, i.e., after the completion of output voltage is established, prebias function is
Through realizing and no longer working.
The embodiment of the present invention one discloses a kind of prebias control circuit, and applied to synchronous rectification power inverter, this is pre-
Bias control circuit includes：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit and prebias signal screen
Circuit is covered, the present invention generates one and synchronous rectification by the phase shift duplicate circuit in prebias control circuit and negater circuit
Rectifying tube driving signal frequency is identical, and after phase, high level part is mutually superimposed, and the pulse width of non-superimposed part is basic
Consistent signal, which produces one after prebias Signal averaging driving circuit and the rectifying tube of synchronous rectification drives
Signal frequency is identical, the consistent signal of duty ratio, and under the rising edge of the signal and the rectifying tube drive signal of synchronous rectification
It drops along same-phase.New drive signal of the signal as synchronous freewheeling pipe.Therefore, avoid continued flow tube on startup usually because
Duty ratio is in that outlet side pre-bias voltage source energy caused by maximum value instead fills and reverse current is excessive leads to synchronous freewheeling pipe
Failure, power inverter start failure, damage and have repeated the fatal problems such as machine, it is achieved thereby that prebias control starts.
Embodiment two
On the basis of embodiment one, the embodiment of the present invention two provides a kind of applied to the pre- inclined of DC/DC forward conversions
Control circuit is put, including：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit, prebias signal shielding electricity
The specific implementation circuit on road.
As shown in Fig. 2, the synchronous rectifier converter is a kind of forward converter, Q101 is primary side switch pipe, Q102 and
C103 is respectively clamper tube and clamp capacitor, and the drive signal of switching tube and clamper tube comes from PWM controller, PWM controller
Also the two signals of synchronous rectification the drive signal DRIVER_A and DRIVER_B of output secondary are complementary relationship simultaneously.T101 is
Isolating transformer, secondary drive synchronous rectification using it, and the drive signal DRIVER_A of rectifying tube Q201 is controlled directly from PWM
Device, outputs of the drive signal G2 of continued flow tube Q202 from prebias Signal averaging driving circuit 104.
As shown in figure 3, give phase shift duplicate circuit 102, negater circuit 103, prebias Signal averaging driving circuit
104th, the circuit connecting relation between prebias signal shielding circuit 105.The input signal of phase shift duplicate circuit 102 is
DRIVER_A, output signal X_D, the input signal of negater circuit 103 are X_D, output signal X_F, prebias signal screen
Cover the input signal X_F and DRIVER_B of circuit 104, output signal G2.
As shown in figure 3, the phase shift duplicate circuit 102 includes：First diode D1, the first capacitance C1, second resistance R2,
5th resistance R5, second switch pipe Q2, the 4th switching tube Q4 and the first operational amplifier IC1A, wherein：
The anode of first diode D1 is connected with the grid of second switch pipe Q2, and common end is as phase shift duplicate circuit
102 input terminal is connected with rectifying tube driving signal output end；The cathode of first diode D1 and one end phase of second resistance R2
Even, the inverting input of the other end of second resistance R2 and the 4th resistance R4, the first capacitance C1 and the first operational amplifier IC1A
Common end be connected, common end input X_C signals；The other end of 4th resistance R4 is connected with the drain electrode of the 4th switching tube Q4,
The grid of 4th switching tube Q4 is connected with the common end of the 5th resistance R5 and second switch pipe Q2, the other end of the 5th resistance R5 with
First power supply VCC is connected, the source electrode of second switch pipe Q2, the source electrode of the 4th switching tube Q4 and the first capacitance C1 it is another
End is connected with common GND；The normal phase input end of first operational amplifier IC1A is connected with the first reference voltage V ref1, the
The ground terminal of one operational amplifier IC1A is connected with common GND, the power input of the first operational amplifier IC1A and
Two power supply VCC2 are connected, and X_C signals are generated X_D signals, the first operational amplifier compared with the first reference voltage V ref1
The output terminal of IC1A is connected as the output terminal of phase shift duplicate circuit 102 with the first input end of negater circuit 103.
Preferably, the second switch pipe Q2 and the 4th switching tube Q4 is NMOS switch pipe.
As shown in figure 3, the negater circuit 103 includes：3rd resistor R3 and first switch pipe Q1, wherein：
One end of 3rd resistor R3 is as the first input end of negater circuit 103 and the output terminal of phase shift duplicate circuit 102
Be connected, the other end of 3rd resistor R3 is connected with the grid of first switch pipe Q1, common end as negater circuit 103 second
Input terminal is connected with the output terminal of prebias signal shielding circuit 105；The source electrode of first switch pipe Q1 and common GND phases
Even, X_F signals are exported from the drain electrode of first switch pipe Q1, and using the drain electrode of first switch pipe Q1 as the defeated of negater circuit 103
Outlet is connected with the second input terminal of prebias Signal averaging driving circuit 104.
Preferably, the first switch pipe Q1 is NMOS switch pipe.
As shown in figure 3, the prebias Signal averaging driving circuit 104 includes：First resistor R1, the 6th resistance R6,
Seven resistance R7, the second diode D2, third diode D3 and third switching tube Q3, wherein：
Second output of the common end of first resistor R1 and the 6th resistance R6 as prebias Signal averaging driving circuit 104
End is connected with the output terminal of negater circuit 103；The other end of first resistor R1 is connected with the first power supply VCC, the 6th resistance
The other end of R6 is connected with the common end of the cathode of third diode D3 and the grid of third switching tube Q3；Third diode D3's
Anode is connected with the source electrode of third switching tube Q3, common end as prebias Signal averaging driving circuit 104 output terminal with
The new driving signal input of continued flow tube is connected；The drain electrode of third switching tube Q3 is connected with the 7th resistance R7, and the 7th resistance R7's is another
One end is connected with the cathode of the second diode D2, and the anode of the second diode D2 is as prebias Signal averaging driving circuit 104
First input end be connected with the original driving signal output end of the continued flow tube of synchronous rectification power inverter 101.
Preferably, the third switching tube Q3 is NMOS switch pipe.
As shown in figure 3, the prebias signal shielding circuit 105 includes：8th resistance R8, the 9th resistance R9, the tenth electricity
R10, the second capacitance C2, third capacitance C3, second operational amplifier IC2A and the 4th diode D4 are hindered, wherein：
One end of 9th resistance R9 is as the input terminal of prebias signal shielding circuit 105 and synchronous rectification power inverter
101 output terminal is connected, the other end of the 9th resistance R9 and the second capacitance C2, the 8th resistance R8 and second operational amplifier
The inverting input of IC2A is connected, and the other end of the second capacitance C2 is connected with the other end of the 8th resistance R8 with common GND；
One end of tenth resistance R10 is connected with the second reference voltage V CC2, the other end and the third capacitance C3 and second of the tenth resistance R10
The normal phase input end of operational amplifier IC2A is connected, and the other end of third capacitance C3 is connected with common GND；Second operation is put
The output terminal of big device IC2A is connected with the cathode of the 4th diode D4, common end output X_E signals, the sun of the 4th diode D4
Pole is connected as the output terminal of prebias signal shielding circuit 105 with the second input terminal of negater circuit 103.
It is illustrated in figure 4 the timing waveform of continued flow tube drive signal G2 generations.It can be seen from the figure that DRIVER_A and
DRIVER_B is complementary.When synchronous rectification power inverter starts, the pulse width of DRIVER_A is because of soft starting circuit
Usually very small, the pulse width of opposite DRIVER_B is then very big, also therefore, when output has bias voltage or does not put
During the capacitance of electricity, continued flow tube will appear reverse current, i.e. bias voltage source or the load capacitance for having energy can pass through continued flow tube
Circuit discharge, cause continued flow tube fail and synchronous rectification power inverter start failure.
The core of patent of the present invention be exactly be supplied in start-up course continued flow tube drive signal pulse width be by
Limitation, and it is basically identical with the pulse width of rectifying tube, above-mentioned phenomenon is avoided the occurrence of with this.Specifically, the rising of X_C signals
Second resistance R2 and the first capacitance C1 chargings are produced along by DRIVER_A, when DRIVER_A is turned off, on the first capacitance C1
Electricity is discharged by the 4th resistance R4 and the 5th switching tube Q5, produces failing edge, and the time of rising edge and failing edge can pass through
Parameter between adjustment second resistance R2, the first capacitance C1, the 4th resistance R4 adjusts.First operational amplifier IC1A is at a high speed
Operational amplifier, voltage on the basis of the first reference voltage V ref1 are produced after X_C signals and the first reference voltage V ref1
X_D signals, i.e.,：When X_C signal amplitudes are more than the first reference voltage V ref1, low level is exported.First switch pipe Q1 and third
Resistance R3 constitutes a reverser, and when X_D signals are low level, first switch pipe Q1 is disconnected, i.e., X_F signals are high electricity
It is flat；When X_D signals are high level, first switch pipe Q1 conductings, then X_F signals are low level.X_F signals go control third to open
The grid of pipe Q3 is closed, when X_F signals are high level, third switching tube Q3 conductings, the high level signal of DRIVER_B can transmit
To G2, when X_F signals are low level, third switching tube Q3 shutdowns even if DRIVER_B signals are high level, can not transmit
To G2, so prebias Signal averaging driving circuit 104 realizes ' with ' output relation of X_F signals and DRIVER_B signals.
The signal of final G2 is as shown in Figure 4, it is clear that, pulse width is less than DRIVER_B, can realize consistent with DRIVER_A.Work as G2
When signal is added to continued flow tube Q202, synchronous rectification power inverter realizes prebias control and starts.
The embodiment of the present invention two disclose it is a kind of applied to single-ended forward converter secondary it drive synchronous rectification topology it is pre-
Bias control circuit, the circuit by the way that the drive signal of rectifying tube is converted into the controlled continued flow tube drive signal of pulse width,
Synchronous rectification control function during startup is realized, is preferably avoided because being generated during continued flow tube pulse width maximum when starting
Backward energy pour in down a chimney with reverse current problem, while improve single-ended forward converter secondary it drive synchronous rectification topology can
By property.
Embodiment three
The present embodiment three provides a kind of synchronous rectification flyback converter prebias control applied to DC/DC flyback converters
Circuit processed, Switching Power Supply has many underlying topology structures, and in addition to normal shock, also single-ended reverse exciting, BUCK is recommended, half-bridge, full-bridge
Deng, more than control circuit also be adapted on the topological structure other than above-mentioned forward topology.Because synchronizing for flyback converter is whole
Flow tube Q201 drive signals and the drive signal of switching tube Q101 are complementary relationships, so on startup, the drive of switching tube Q101
Dynamic signal is small duty ratio (i.e. narrow pulse width state), and the drive signal of synchronous rectifier is then in maximum duty cycle (i.e.
Broad pulse width state), if there is no prebias control circuit, phenomena such as also will appear reverse current and start failure.
As shown in Figure 5 and Figure 6, the embodiment of the present invention three provide it is a kind of applied to flyback converter synchronous rectification topology
Prebias control circuit, specifically, synchronous rectification flyback converter as shown in figure 5, prebias control circuit as shown in fig. 6, need
It is noted that Fig. 6 is on the basis of Fig. 3, the prebias Signal averaging driving circuit in Fig. 3 is only added in the two or two pole
The DRIVER_B signals of pipe D2 anodes have made DRIVER_A signals into.In the present embodiment, DRIVER_A signals also come from
PWM controller, and at the same time being the drive signal of switching tube Q101.The prebias control circuit proposed through this embodiment, it is single
End counter exciting synchronous rectification converter can also realize prebias control function, preferably avoid because continued flow tube pulse is wide when starting
The backward energy that degree generates when maximum pours in down a chimney and reverse current problem.
It is pre- partially that the embodiment of the present invention three discloses a kind of synchronous rectification flyback converter applied to DC/DC flyback converters
Control circuit is put, the prebias control circuit which provides is controlled by the way that the drive signal of switching tube is converted into pulse width
Rectifying tube drive signal, realize synchronous rectification control function during startup, preferably avoid because start when export it is whole
The backward energy generated during flow tube pulse width maximum pour in down a chimney with reverse current problem, while also improve single end flyback converter
The reliability of its drive synchronous rectification topology of secondary.
It should be noted that single-ended forward converter be for single end flyback converter be also herein important embodiment it
One, operation principle is identical with embodiment one, embodiment two and embodiment three, and details are not described herein.
Example IV
Shown in Figure 7, the invention also discloses a kind of prebias control method, which is applied to upper
The prebias control circuit is stated, which is applied to synchronous rectification power inverter, the synchronous rectification work(
Rate converter for single-end ortho-exciting synchronous rectification topology, the synchronous rectification power inverter include rectifying tube driving signal output end,
The original driving signal output end of continued flow tube and the new driving signal output end of continued flow tube, rectifying tube driving signal output end are used to export
The synchronous rectification drive signal DRIVER_A of secondary, while one of input signal as the prebias control circuit, afterflow
Original drive signal DRIVER_B is managed for another input signal as the prebias control circuit, the synchronization of secondary
The original drive signal DRIVER_B of the continued flow tube of rectification drive signal DRIVER_A and secondary be complementary relationship, then the prebias control
Circuit processed includes：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit, prebias signal shielding circuit, institute
Prebias control method is stated to include：
S701, the identification of synchronous rectification power inverter starting state, i.e., output voltage is established from beginning setting up to completing.
S702, in synchronous rectification power converters device start-up course, by the synchronous rectification drive signal of secondary
DRIVER_A generates the identical reverse signal of a frequency, the low level in each period of reverse signal by phase shift duplicate circuit
High level width of the retention time slightly larger than the synchronous rectification drive signal DRIVER_A of secondary, reverse signal input are reversely electric
Road generates a reverse signal with reverse signal phase complements.
S703, prebias Signal averaging driving circuit are by the original drive signal DRIVER_B of the synchronous freewheeling of secondary and reversely
A new drive signal is generated after the output signal superposition of circuit, as the new drive signal of continued flow tube, drives synchronous rectification work(
The afterflow device of rate converter.
S704, synchronous rectification power converters device start at the end of, prebias signal shielding circuit passes through detection
The output voltage of synchronous rectification power inverter, when synchronous rectification power inverter is completed to start, prebias signal shielding electricity
Road exports a disable signal, and the output signal of negater circuit is shielded.
S705, synchronous rectification power converters device start at the end of, prebias control function terminates, synchronous freewheeling
Pipe drive signal is directly from the original driving signal output end of continued flow tube, so as to which entire circuit starts work according to original state
Make, the drive signal of practical rectifying tube and continued flow tube restores complementary relationship, and synchronous rectification power inverter starts to work normally.
The embodiment of the present invention four discloses a kind of prebias control method, and applied to synchronous rectification power inverter, this is pre-
Bias control circuit includes：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit and prebias signal screen
Circuit is covered, the present invention generates one and synchronous rectification by the phase shift duplicate circuit in prebias control circuit and negater circuit
Rectifying tube driving signal frequency is identical, and after phase, high level part is mutually superimposed, and the pulse width of non-superimposed part is basic
Consistent signal, which produces one after prebias Signal averaging driving circuit and the rectifying tube of synchronous rectification drives
Signal frequency is identical, the consistent signal of duty ratio, and under the rising edge of the signal and the rectifying tube drive signal of synchronous rectification
It drops along same-phase.New drive signal of the signal as synchronous freewheeling pipe.Therefore, avoid continued flow tube on startup usually because
Duty ratio is in that outlet side pre-bias voltage source energy caused by maximum value instead fills and reverse current is excessive leads to synchronous freewheeling pipe
Failure, power inverter start failure, damage and have repeated the fatal problems such as machine, it is achieved thereby that prebias control starts.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this practical relationship or sequence.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion so that article or equipment including a series of elements not only include those elements, but also is wrapped
It includes other elements that are not explicitly listed or further includes as this article or the intrinsic element of equipment.Do not having more
In the case of more limitations, the element that is limited by sentence "including a ...", it is not excluded that in the article including above-mentioned element or
Also there are other identical elements in person's equipment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide range caused.
Claims (9)
1. a kind of prebias control circuit, which is characterized in that applied to synchronous rectification power inverter, the synchronous rectification power
Converter for single-end ortho-exciting synchronous rectification topology, the synchronous rectification power inverter include rectifying tube driving signal output end,
The original driving signal output end of continued flow tube and the new driving signal input of continued flow tube, the rectifying tube driving signal output end are used for
The synchronous rectification drive signal DRIVER_A of secondary, while one of input signal as the prebias control circuit are exported,
The original drive signal DRIVER_B of continued flow tube is for another input signal as the prebias control circuit, institute
The original drive signal DRIVER_B of continued flow tube for stating the synchronous rectification drive signal DRIVER_A and the secondary of secondary is complementation
Relationship, the prebias control circuit include：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit, it is pre- partially
Confidence screened circuit, wherein：
The input terminal of the phase shift duplicate circuit is connected with the rectifying tube driving signal output end, the prebias Signal averaging
The first input end of driving circuit is connected with the original driving signal output end of the continued flow tube；
The output terminal of the phase shift duplicate circuit is connected with the first input end of the negater circuit, the output of the negater circuit
End be connected with the second input terminal of the prebias Signal averaging driving circuit, the prebias Signal averaging driving circuit it is defeated
Outlet is connected with the new driving signal input of the continued flow tube；
The input terminal of the prebias signal shielding circuit is connected with the output terminal of the synchronous rectification power inverter, described pre-
The output terminal of offset signal screened circuit is connected with the second input terminal of the negater circuit；
The synchronous rectification drive signal DRIVER_A of the secondary inputs the phase shift duplicate circuit, and it is identical to generate a frequency
Reverse signal, the synchronous rectification driving of the low level retention time slightly larger than the secondary in each period of the reverse signal are believed
The high level width of number DRIVER_A, the reverse signal input the negater circuit, generate one and the reverse signal phase
The complementary reverse signal in position；
The prebias Signal averaging driving circuit is by the original drive signal DRIVER_B of the synchronous freewheeling pipe of the secondary and institute
A new drive signal is generated after stating the output signal superposition of negater circuit, as the new drive signal of the continued flow tube, driving
The continued flow tube of the synchronous rectification power inverter；
The input signal of the prebias signal shielding circuit is the output voltage of the synchronous rectification power inverter, when described
When synchronous rectification power inverter is completed to start, described one disable signal of prebias signal shielding circuit output will be described anti-
It is shielded to the output signal of circuit.
2. prebias control circuit according to claim 1, which is characterized in that the phase shift duplicate circuit includes：First
Diode, the first capacitance, second resistance, the 5th resistance, second switch pipe, the 4th switching tube and the first operational amplifier,
In：
The anode of first diode is connected with the grid of the second switch pipe, and electricity is replicated in common end as the phase shift
The input terminal on road is connected with the rectifying tube driving signal output end；
The cathode of first diode is connected with one end of the second resistance, the other end of the second resistance and described the
Four resistance, first capacitance are connected with the common end of the inverting input of first operational amplifier, common end input
X_C signals；
The other end of 4th resistance is connected with the drain electrode of the 4th switching tube, the grid of the 4th switching tube with it is described
5th resistance is connected with the common end of the second switch pipe, and the other end of the 5th resistance is connected with the first power supply,
The source electrode of the second switch pipe, the source electrode of the 4th switching tube and the other end of first capacitance and common phase
Even；
The normal phase input end of first operational amplifier is connected with the first reference voltage, the ground connection of first operational amplifier
End is connected with the common, and the power input of first operational amplifier is connected with the second power supply, by described in
X_C signals generate X_D signals compared with first reference voltage, and the output terminal of first operational amplifier is as the shifting
The output terminal of phase duplicate circuit is connected with the first input end of the negater circuit.
3. prebias control circuit according to claim 2, which is characterized in that the second switch pipe and the described 4th is opened
Pipe is closed as NMOS switch pipe.
4. prebias control circuit according to claim 1, which is characterized in that the negater circuit includes：3rd resistor
With first switch pipe, wherein：
One end of the 3rd resistor is as the first input end of the negater circuit and the output terminal of the phase shift duplicate circuit
It is connected, the other end of the 3rd resistor is connected with the grid of the first switch pipe, and common end is as the negater circuit
The second input terminal be connected with the output terminal of the prebias signal shielding circuit；
The source electrode of the first switch pipe is connected with the common, and X_F signals are exported from the drain electrode of the first switch pipe,
And using the first switch pipe drain electrode as the negater circuit output terminal and the prebias Signal averaging driving circuit
The second input terminal be connected.
5. prebias control circuit according to claim 4, which is characterized in that the first switch pipe is NMOS switch
Pipe.
6. prebias control circuit according to claim 1, which is characterized in that the prebias Signal averaging driving circuit
Including：First resistor, the 6th resistance, the 7th resistance, the second diode, third diode and third switching tube, wherein：
The common end of the first resistor and the 6th resistance is second defeated as the prebias Signal averaging driving circuit
Outlet is connected with the output terminal of the negater circuit；
The other end of the first resistor is connected with first power supply, the other end and the third of the 6th resistance
The cathode of diode is connected with the common end of the grid of the third switching tube；
The anode of the third diode is connected with the source electrode of the third switching tube, and common end is as the prebias signal
The output terminal of superposition driving circuit is connected with the new driving signal input of the continued flow tube；
The drain electrode of the third switching tube is connected with the 7th resistance, the other end and the two or two pole of the 7th resistance
The cathode of pipe is connected, the anode of second diode as the prebias Signal averaging driving circuit first input end with
The original driving signal output end of continued flow tube of the synchronous rectification power inverter is connected.
7. prebias control circuit according to claim 6, which is characterized in that the third switching tube is NMOS switch
Pipe.
8. prebias control circuit according to claim 1, which is characterized in that the prebias signal shielding circuit packet
It includes：8th resistance, the 9th resistance, the tenth resistance, the second capacitance, third capacitance, second operational amplifier and the 4th diode,
Wherein：
One end of 9th resistance becomes as the input terminal of the prebias signal shielding circuit with the synchronous rectification power
The output terminal of parallel operation is connected, the other end and second capacitance, the 8th resistance and described second of the 9th resistance
The inverting input of operational amplifier is connected, the other end and the public affairs of the other end of second capacitance with the 8th resistance
Holding altogether is connected；
One end of tenth resistance is connected with the second reference voltage, the other end of the tenth resistance and the third capacitance and
The normal phase input end of the second operational amplifier is connected, and the other end of the third capacitance is connected with the common；
The output terminal of the second operational amplifier is connected with the cathode of the 4th diode, common end output X_E signals,
The anode of 4th diode is second defeated as output terminal and the negater circuit of the prebias signal shielding circuit
Enter end to be connected.
9. a kind of prebias control method, which is characterized in that applied to the prebias described in the claims 1-8 any one
Control circuit, the prebias control circuit are applied to synchronous rectification power inverter, and the synchronous rectification power inverter is single
Whole positive exciting synchronous rectification topology is held, it is former that the synchronous rectification power inverter includes rectifying tube driving signal output end, continued flow tube
Beginning driving signal output end and the new driving signal output end of continued flow tube, the rectifying tube driving signal output end are used to export secondary
Synchronous rectification drive signal DRIVER_A, while one of input signal as the prebias control circuit, the afterflow
Original drive signal DRIVER_B is managed for another input signal as the prebias control circuit, the secondary
The original drive signal DRIVER_B of the continued flow tube of synchronous rectification drive signal DRIVER_A and the secondary is complementary relationship, described
Prebias control circuit includes：Phase shift duplicate circuit, negater circuit, prebias Signal averaging driving circuit, prebias signal screen
Circuit is covered, the prebias control method includes：
The synchronous rectification power inverter starting state identification, i.e., output voltage is established from beginning setting up to completing；
In the synchronous rectification power converters device start-up course, by the synchronous rectification drive signal of the secondary
DRIVER_A generates the identical reverse signal of a frequency, each period of the reverse signal by the phase shift duplicate circuit
The low level retention time slightly larger than the secondary synchronous rectification drive signal DRIVER_A high level width, it is described reversely
Signal inputs the negater circuit, generates a reverse signal with the reverse signal phase complements；
The prebias Signal averaging driving circuit is by the original drive signal DRIVER_B of the synchronous freewheeling pipe of the secondary and institute
The output signal of negater circuit is stated, a new drive signal is generated after superposition, as the new drive signal of the continued flow tube, driving
The continued flow tube of the synchronous rectification power inverter；
At the end of the synchronous rectification power converters device starts, the prebias signal shielding circuit is by detecting
The output voltage of synchronous rectification power inverter is stated, when the synchronous rectification power inverter is completed to start, the prebias
One disable signal of signal shielding circuit output shields the output signal of the negater circuit；
At the end of the synchronous rectification power converters device starts, prebias control function terminates, the synchronous freewheeling
Pipe drive signal is directly from the original driving signal output end of the continued flow tube, so as to which entire circuit starts according to original state
The drive signal of work, practical rectifying tube and continued flow tube restores complementary relationship, and the synchronous rectification power inverter starts normally
Work.
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| CN111176360A (en) * | 2020-01-06 | 2020-05-19 | 深圳市雷能混合集成电路有限公司 | Method for digitally controlling pre-bias starting machine |
| CN111509962A (en) * | 2020-05-26 | 2020-08-07 | 深圳市雷能混合集成电路有限公司 | Control method and device for preventing current backflow and power supply equipment |
| CN112019067A (en) * | 2019-05-31 | 2020-12-01 | 日本电产株式会社 | Power supply unit, motor unit and air supply unit |
| CN112578700A (en) * | 2019-09-30 | 2021-03-30 | 三星电子株式会社 | Electronic device and operation method thereof |
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