CN105553277B - A kind of digital synchronous rectification control method, device and Switching Power Supply - Google Patents
A kind of digital synchronous rectification control method, device and Switching Power Supply Download PDFInfo
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- CN105553277B CN105553277B CN201511026069.2A CN201511026069A CN105553277B CN 105553277 B CN105553277 B CN 105553277B CN 201511026069 A CN201511026069 A CN 201511026069A CN 105553277 B CN105553277 B CN 105553277B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of digital synchronous rectification control method, device and Switching Power Supplies.Wherein, the digital synchronous rectification control method includes: to obtain the driving signal DRQ1 of the first switch tube and driving signal DRQ2 of second switch in digital half-bridge circuit of synchronous rectification；When the rising edge of the driving signal DRQ1 of first switch tube and the driving signal DRQ2 of second switch arrive, the driving signal SRQ3 of third switching tube and the driving signal SRQ4 of the 4th switching tube in digital half-bridge circuit of synchronous rectification are triggered according to default opening time and is opened；Before the failing edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of first switch tube arrives, the driving signal SRQ3 of third switching tube and the driving signal SRQ4 of the 4th switching tube in digital half-bridge circuit of synchronous rectification are triggered according to the default shut-in time and is stopped.The present invention is suitable for digital synchronous rectification control.
Description
Technical field
The present invention relates to power electronics field, in particular to a kind of digital synchronous rectifies control method, device and opens
Powered-down source.
Background technique
As the continuous development and internet of power electronic technique are widely applied in every field, big data era is
Through arriving, existing hardware device can no longer meet the market demand, and a large amount of server is applied, so high-performance, big function
The server power supply of rate is just more and more important.
It is illustrated in fig. 1 shown below in the prior art using synchronous rectification control chip.When M1 is opened, IC control metal-oxide-semiconductor SR2 is opened
It is logical；It is open-minded to control SR1 by IC when metal-oxide-semiconductor M2 is opened.In figure VS the and VD foot of IC be respectively hysteresis comparator same phase and reverse phase it is defeated
Enter end.Since hardware synchronization rectification control chip is the switch for controlling metal-oxide-semiconductor by sampling in this scheme, and transformer secondary output
For high frequency concentration zones, sampled signal is easily disturbed；Again because IC chip requires high frequency, the period such as is easily lost in high frequency
Deng various requirements such as underloading, heavy duty, dynamic can not be met simultaneously, so that the control reliability of entire synchronous rectification
It is not high.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State a kind of digital synchronous rectification control method, device and the Switching Power Supply of problem.
According to one aspect of the present invention, the present invention provides a kind of digital synchronous to rectify control method, this method comprises:
Obtain the driving signal DRQ1 of first switch tube and the driving of second switch in digital half-bridge circuit of synchronous rectification
Signal DRQ2；The driving signal DRQ1 of the first switch tube and driving signal DRQ2 of second switch is the drive of two-way complementation
Dynamic signal；
When the rising edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives
When, the driving signal SRQ3 of third switching tube and the are triggered in the digital half-bridge circuit of synchronous rectification according to default opening time
The driving signal SRQ4 of four switching tubes is opened；
When the failing edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives
Before, the driving signal SRQ3 of third switching tube and the are triggered in the digital half-bridge circuit of synchronous rectification according to the default shut-in time
The driving signal SRQ4 of four switching tubes stops.
Wherein, this method further include:
The driving signal SRQ4 triggering for presetting the driving signal SRQ3 and the 4th switching tube of the third switching tube is beaten
ETAD expected time of arrival and departure t2 and triggering shut-in time t1.
Wherein, the driving signal DRQ2's of the driving signal DRQ1 and second switch when the first switch tube is upper
It rises along when arriving, the driving signal of third switching tube in the digital half-bridge circuit of synchronous rectification is triggered according to default opening time
The step of driving signal SRQ4 of SRQ3 and the 4th switching tube is opened are as follows:
When the rising edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives
When, start timing, when the timing time reaches the triggering opening time t2, the driving signal SRQ3 of the third switching tube
It is opened with the driving signal SRQ4 of the 4th switching tube.
Wherein, described when under the driving signal DRQ1 of the first switch tube and the driving signal DRQ2 of second switch
Drop triggers the driving signal of third switching tube in the digital half-bridge circuit of synchronous rectification according to the default shut-in time before arriving
The step of driving signal SRQ4 of SRQ3 and the 4th switching tube stops are as follows:
When the failing edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives
When the preceding time is the triggering shut-in time t1, the driving signal of third switching tube in the number half-bridge circuit of synchronous rectification
The driving signal SRQ4 of SRQ3 and the 4th switching tube stops.
According to another aspect of the invention, the present invention provides a kind of digital synchronous rectifier control device, the device packets
Include: driving signal acquiring unit, for obtain in digital half-bridge circuit of synchronous rectification the driving signal DRQ1 of first switch tube and
The driving signal DRQ2 of second switch；The driving signal DRQ1 of the first switch tube and the driving signal of second switch
DRQ2 is the driving signal of two-way complementation；
Opening unit is triggered, for when the driving signal DRQ1 of the first switch tube and the driving signal of second switch
When the rising edge of DRQ2 arrives, third switching tube in the digital half-bridge circuit of synchronous rectification is triggered according to default opening time
The driving signal SRQ4 of driving signal SRQ3 and the 4th switching tube is opened；
Closing unit is triggered, for when the driving signal DRQ1 of the first switch tube and the driving signal of second switch
Before the failing edge of DRQ2 arrives, third switching tube in the digital half-bridge circuit of synchronous rectification is triggered according to the default shut-in time
The driving signal SRQ4 of driving signal SRQ3 and the 4th switching tube stops.
Wherein, the device further include:
Threshold cell, for presetting the driving signal SRQ3 of the third switching tube and the driving letter of the 4th switching tube
Number SRQ4 triggering opening time t2 and triggering shut-in time t1.
Wherein, the triggering opening unit is also used to driving signal DRQ1 and second switch when the first switch tube
When the rising edge of the driving signal DRQ2 of pipe arrives, start timing, when the timing time reaches the triggering opening time t2,
The driving signal SRQ3 of the third switching tube and the driving signal SRQ4 of the 4th switching tube are opened.
Wherein, the triggering closing unit is also used to driving signal DRQ1 and second switch when the first switch tube
When time before the failing edge arrival of the driving signal DRQ2 of pipe is the triggering shut-in time t1, the number half-bridge synchronizes whole
The driving signal SRQ4 of the driving signal SRQ3 of third switching tube and the 4th switching tube stops in current circuit.
Another aspect according to the present invention, the present invention provides a kind of Switching Power Supply, the Switching Power Supply includes: as above
The digital synchronous rectifier control device.
The beneficial effects of the present invention are: technical solution of the present invention is based on programmable digital circuit of synchronous rectification, by using
It is triggering with the rising edge and failing edge of first switch tube and second switch driving signal in digital half-bridge circuit of synchronous rectification
The driving signal SRQ3 of the third switching tube and the driving signal SRQ4 of the 4th switching tube open the condition with stopping, avoiding
Transformer and the interference of secondary end high-frequency electromagnetic.And the drive of the driving signal SRQ3 and the 4th switching tube of the third switching tube
Dynamic signal SRQ4 is opened and stopping basis presetting opening time and the shut-in time is accurately controlled driving signal, so that digital synchronous
Rectification can allow synchronous rectification maximum magnitude within half of half-bridge period to be connected in the case where ensureing reliability, improve same
Walk the efficiency of rectification.
Detailed description of the invention
Fig. 1 is a kind of circuit of synchronous rectification figure in the prior art；
Fig. 2 is a kind of half-bridge resonance circuit of digital synchronous rectification control method control provided by the invention；
Fig. 3 is a kind of digital synchronous rectification control method flow chart provided by the invention；
Fig. 4 is a kind of structural schematic diagram provided by the invention；
Fig. 5 (a) is that the present invention provides a kind of rectification control method control half-bridge resonance circuit work of digital synchronous in resonance
Point region timing diagram；
Fig. 5 (b) is that the present invention provides a kind of rectification control method control half-bridge resonance circuit work of digital synchronous in resonance
Point left side timing diagram；
Fig. 5 (c) is that the present invention provides a kind of rectification control method control half-bridge resonance circuit work of digital synchronous in resonance
Point right side timing diagram；
Fig. 6 is a kind of digital synchronous rectifier control device structural schematic diagram provided by the invention；
Fig. 7 is a kind of switching power supply structure schematic diagram provided by the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The present invention provides a kind of digital synchronous rectification control method, device and Switching Power Supplies.
Fig. 3 is a kind of digital synchronous rectification control method flow chart provided by the invention；It is humorous based on half-bridge as shown in Figure 2
Shake circuit, and digital synchronous provided by the invention rectifies control method, comprising:
301: obtaining the driving signal DRQ1 of first switch tube and second switch in digital half-bridge circuit of synchronous rectification
Driving signal DRQ2；The driving signal DRQ1 of the first switch tube and driving signal DRQ2 of second switch is that two-way is complementary
Driving signal；
302: when the rising edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube
When arrival, the driving signal SRQ3 of third switching tube in the digital half-bridge circuit of synchronous rectification is triggered according to default opening time
It is opened with the driving signal SRQ4 of the 4th switching tube；
303: when the failing edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube
Before arrival, the driving signal SRQ3 of third switching tube in the digital half-bridge circuit of synchronous rectification is triggered according to the default shut-in time
Stop with the driving signal SRQ4 of the 4th switching tube.
It should be noted that this method further include:
The driving signal SRQ4 triggering for presetting the driving signal SRQ3 and the 4th switching tube of the third switching tube is beaten
ETAD expected time of arrival and departure t2 and triggering shut-in time t1.
It should be noted that described as the driving signal DRQ1 of the first switch tube and the driving signal of second switch
When the rising edge of DRQ2 arrives, third switching tube in the digital half-bridge circuit of synchronous rectification is triggered according to default opening time
The step of driving signal SRQ4 of driving signal SRQ3 and the 4th switching tube is opened are as follows:
When the rising edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives
When, start timing, when the timing time reaches the triggering opening time t2, the driving signal SRQ3 of the third switching tube
It is opened with the driving signal SRQ4 of the 4th switching tube.
It should be noted that described as the driving signal DRQ1 of the first switch tube and the driving signal of second switch
Before the failing edge of DRQ2 arrives, third switching tube in the digital half-bridge circuit of synchronous rectification is triggered according to the default shut-in time
The step of driving signal SRQ4 of driving signal SRQ3 and the 4th switching tube stops are as follows:
When the failing edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives
When the preceding time is the triggering shut-in time t1, the driving signal of third switching tube in the number half-bridge circuit of synchronous rectification
The driving signal SRQ4 of SRQ3 and the 4th switching tube stops.
It should be noted that the first switch tube Q1 and second switch Q2 are half-bridge resonance circuits as shown in Figure 2
In two switching tubes, switch complementary；The third switching tube Q3 and the 4th switching tube Q4 respectively will be with described second
Switching tube Q2 is identical with the phase that first switch tube Q1 is switched；In the identical half-bridge of one group of phase and synchronous rectification switch pipe, together
It is open-minded in the half-bridge switch service time section of its same-phase to walk rectifier switch pipe.The synchronous rectification switch is the third
Switching tube Q3 and the 4th switching tube Q4；The half-bridge switch is the first switch tube Q1 and second switch Q2.
The beneficial effects of the present invention are: technical solution of the present invention is based on programmable digital circuit of synchronous rectification, by using
It is triggering with the rising edge and failing edge of first switch tube and second switch driving signal in digital half-bridge circuit of synchronous rectification
The driving signal SRQ3 of the third switching tube and the driving signal SRQ4 of the 4th switching tube open the condition with stopping, avoiding
Transformer and the interference of secondary end high-frequency electromagnetic.And the drive of the driving signal SRQ3 and the 4th switching tube of the third switching tube
Dynamic signal SRQ4 is opened and stopping basis presetting opening time and the shut-in time is accurately controlled driving signal, so that digital synchronous
Rectification can allow synchronous rectification maximum magnitude within half of half-bridge period to be connected in the case where ensureing reliability, improve and synchronize
The efficiency of rectification.
Based on above embodiments, the realization principle of technical solution of the present invention is described in detail below；It is specific as follows:
Program precondition is digital half-bridge, and the waveform of half-bridge is generated the driving signal of two-way complementation by timer 1, point
It is not denoted as the driving signal that DRQ1 and DRQ2 (shown in Fig. 4) is first switch tube Q1 and second switch Q2 (shown in Fig. 2).SRQ3
It is respectively the driving signal of third switching tube Q3 and the 4th switching tube Q4 (shown in Fig. 2) with SRQ4 (shown in Fig. 4), wherein SRQ4 drives
Dynamic signal is generated by timer 2；SRQ3 driving signal is generated by timer 3；SRQ3 and SRQ4 is respectively with the upper of DRQ2 and DRQ1
Edge is risen as triggering opening signal.Timer 2 starts timing with the rising edge triggering of DRQ1, when delay triggers opening time t2
Between after open SRQ4, be by the time with the failing edge of DRQ1, the failing edge of DRQ1 arrives the triggering shut-in time t1 time in advance
Stop SRQ4；Similarly, timer 3 starts timing with the rising edge triggering of DRQ2, SRQ3 is opened after postponing the t2 time, in advance under DRQ2
Drop shuts down only SRQ3 along the t1 time.Timing diagram is as shown in Figure 4.
Half-bridge resonance circuit works on the right side of the resonance point such as left side Fig. 5 (a), resonance point such as Fig. 5 (b), resonance point such as respectively
Three regions Fig. 5 (c).iLr.For resonant slots current waveform, iDFor the current waveform after transformer secondary output rectification.If half-bridge resonance
Frequency is fr, working frequency fs.
Work is in resonance point, i.e. fs=fr.Assuming that in Fig. 5 (a) shown in T0 moment corresponding diagram 2 in first switch tube Q1
It opens the moment, the pipe Q4 that opens the light of Tsr1 the corresponding 4th is opened the moment, and Tsr2 is that the 4th pipe Q4 that opens the light turns off the moment.4th opens the light pipe Q4
The rising edge triggering opened with first switch tube Q1, delay time t2=Tsr1-T0, t2 will be according to half-bridge-transformers-at this time
Lag time in circuit of synchronous rectification determines；Q4 will shift to an earlier date Q1 shutdown, and t1 will be according to half-bridge-transformer-circuit of synchronous rectification
In the precision of lag time, series resonance inductor, resonant capacitance etc. determine jointly.When the lower half period, second switch Q2 and
Third switching tube Q3 switching sequence is the same as Q1 and Q4.
Work is on the left of resonance point, i.e. when fs < fr.Assuming that in Fig. 5 (b) shown in T0 moment corresponding diagram 2 in Q1 when opening
It carves, Trs1 corresponds to Q4 and opens the moment.The rising edge triggering that Q4 is opened with Q1, delay time t2=Tsr1-T0, t2 will bases at this time
Lag time in half-bridge-transformer-circuit of synchronous rectification determines (general very little, 100ns is for reference)；Q4 ratio Q1 is turned off in advance
Time are as follows:(200ns meaning is with 200ns when fs=fr).Under
When the half period, Q2 and Q3 switching sequence is the same as Q1 and Q4.
Work is on the right side of resonance point, i.e. when fs > fr.Assuming that in Fig. 5 (c) shown in T0 moment corresponding diagram 2 in Q1 when opening
It carves, Tsr1 corresponds to Q4 and opens the moment, and Tsr2 is that Q4 turns off the moment.Q4 is triggered with the rising edge that Q1 is opened, at this time delay time t2
=Tsr1-T0, t2 will be determined according to the lag time in half-bridge-transformer-circuit of synchronous rectification；Q4 will shift to an earlier date Q1 shutdown, t1
It is common according to the precision of lag time, series resonance inductor, resonant capacitance in half-bridge-transformer-circuit of synchronous rectification etc.
It determines.When the lower half period, Q2 and Q3 switching sequence is the same as Q1 and Q4.
Fig. 6 is a kind of digital synchronous rectifier control device structural schematic diagram provided by the invention；The device, comprising:
Driving signal acquiring unit 601, the driving for obtaining first switch tube in digital half-bridge circuit of synchronous rectification are believed
The driving signal DRQ2 of number DRQ1 and second switch；The driving signal DRQ1 of the first switch tube and the drive of second switch
Dynamic signal DRQ2 is the driving signal of two-way complementation；
Opening unit 602 is triggered, for when the driving signal DRQ1 of the first switch tube and the driving of second switch
When the rising edge of signal DRQ2 arrives, switched according to third in the default opening time triggering digital half-bridge circuit of synchronous rectification
The driving signal SRQ3 of pipe and the driving signal SRQ4 of the 4th switching tube are opened；
Closing unit 603 is triggered, for when the driving signal DRQ1 of the first switch tube and the driving of second switch
Before the failing edge of signal DRQ2 arrives, switched according to third in triggering of the default shut-in time digital half-bridge circuit of synchronous rectification
The driving signal SRQ3 of pipe and the driving signal SRQ4 of the 4th switching tube stop.
The device further include:
Threshold cell, for presetting the driving signal SRQ3 of the third switching tube and the driving letter of the 4th switching tube
Number SRQ4 triggering opening time t2 and triggering shut-in time t1.
It should be noted that the triggering opening unit, be also used to when the first switch tube driving signal DRQ1 and
When the rising edge of the driving signal DRQ2 of second switch arrives, start timing, is beaten when the timing time reaches the triggering
ETAD expected time of arrival and departure t2, the driving signal SRQ3 of the third switching tube and the driving signal SRQ4 of the 4th switching tube are opened.
The triggering closing unit is also used to the drive of the driving signal DRQ1 and second switch when the first switch tube
When time before the failing edge arrival of dynamic signal DRQ2 is the triggering shut-in time t1, the number half-bridge circuit of synchronous rectification
The driving signal SRQ3 of middle third switching tube and the driving signal SRQ4 of the 4th switching tube stop.
Fig. 7 is a kind of switching power supply structure schematic diagram provided by the invention；The Switching Power Supply, comprising: number as described above
Synchronous commutation control device.
The beneficial effects of the present invention are: technical solution of the present invention is based on programmable digital circuit of synchronous rectification, by using
It is triggering with the rising edge and failing edge of first switch tube and second switch driving signal in digital half-bridge circuit of synchronous rectification
The driving signal SRQ3 of the third switching tube and the driving signal SRQ4 of the 4th switching tube open the condition with stopping, avoiding
Transformer and the interference of secondary end high-frequency electromagnetic.And the drive of the driving signal SRQ3 and the 4th switching tube of the third switching tube
Dynamic signal SRQ4 is opened and stopping basis presetting opening time and the shut-in time is accurately controlled driving signal, so that digital synchronous
Rectification can allow synchronous rectification maximum magnitude within half of half-bridge period to be connected in the case where ensureing reliability, improve and synchronize
The efficiency of rectification.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (7)
1. a kind of digital synchronous rectifies control method characterized by comprising
Obtain the driving signal DRQ1 of first switch tube and the driving of second switch in half-bridge-transformer-circuit of synchronous rectification
Signal DRQ2；The driving signal DRQ1 of the first switch tube and driving signal DRQ2 of second switch is the drive of two-way complementation
Dynamic signal；
When the rising edge of the driving signal DRQ1 of the first switch tube and the driving signal DRQ2 of second switch arrive, press
According to default opening time t2 trigger in the half-bridge-transformer-circuit of synchronous rectification driving signal SRQ3 of third switching tube and
The driving signal SRQ4 of 4th switching tube is opened；
Before the failing edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives, press
According to default shut-in time t1 trigger in the half-bridge-transformer-circuit of synchronous rectification driving signal SRQ3 of third switching tube and
The driving signal SRQ4 of 4th switching tube stops；
When the opening of the driving signal SRQ4 of the driving signal SRQ3 and the 4th switching tube of the default triggering third switching tube
Between t2 and shut-in time t1, specifically, when half-bridge-transformer-circuit of synchronous rectification working frequency be equal to or more than institute
When stating half-bridge-transformer-circuit of synchronous rectification resonance frequency, the default opening time t2 is same according to the half-bridge-transformer-
The lag time walked in rectification circuit determines that the default shut-in time t1 is according in half-bridge-transformer-circuit of synchronous rectification
Lag time, series resonance inductor, resonant capacitance precision determine jointly；When the half-bridge-transformer-circuit of synchronous rectification
When working frequency is less than the half-bridge-transformer-circuit of synchronous rectification resonance frequency, the default opening time t2 will basis
Lag time in half-bridge-transformer-circuit of synchronous rectification is determining, the default shut-in timeIts
In, fr is the half-bridge-transformer-circuit of synchronous rectification resonance frequency, and fs is the half-bridge-transformer-synchronous rectification electricity
The working frequency on road；
Half-bridge-transformer-the circuit of synchronous rectification further includes first capacitor, the second capacitor, the first inductance, the second inductance and change
Depressor；The anode of the first port connection power supply of the first switch tube Q1, the second port of the first switch tube Q1 and institute
The tie point for stating the first port of second switch Q2 is connect with one end of the first capacitor, and the of the second switch Q2
Two-port netwerk connects the cathode of the power supply, the cathode ground connection of the power supply；The other end of the first capacitor and first electricity
One end of sense connects；The other end of first inductance connect second inductance one end and the primary winding
The tie point of first port；At the beginning of the other end of second inductance connects second port and the transformer of the second switch Q2
The tie point of the second port of grade winding；The first port of the third switching tube Q3 and the first of the transformer secondary output winding
Port connection, the second port ground connection of the third switching tube Q3；The first port and the transformation of the 4th switching tube Q4
The second port of device secondary windings connects, and the second port of the 4th switching tube Q4 is connect with one end of second capacitor,
The other end of second capacitor is connect with the third port of the transformer secondary output winding；
The series resonance inductor includes first inductance and second inductance；The resonant capacitance includes first electricity
Hold and second capacitor.
2. digital synchronous as described in claim 1 rectifies control method, which is characterized in that described when the first switch tube
When the rising edge of driving signal DRQ1 and the driving signal DRQ2 of second switch arrive, according to described in the triggering of default opening time
The driving signal SRQ4 of the driving signal SRQ3 of third switching tube and the 4th switching tube in half-bridge-transformer-circuit of synchronous rectification
The step of opening are as follows:
When the rising edge of the driving signal DRQ1 of the first switch tube and the driving signal DRQ2 of second switch arrive, open
Beginning timing, when the timing time reaches the opening time t2, the driving signal SRQ3 and the 4th of the third switching tube is opened
The driving signal SRQ4 for closing pipe is opened.
3. digital synchronous as claimed in claim 2 rectifies control method, which is characterized in that described when the first switch tube
Before the failing edge of driving signal DRQ1 and the driving signal DRQ2 of second switch arrive, according to described in the triggering of default shut-in time
The driving signal SRQ4 of the driving signal SRQ3 of third switching tube and the 4th switching tube in half-bridge-transformer-circuit of synchronous rectification
The step of stopping are as follows:
Before the failing edge of the driving signal DRQ2 of the driving signal DRQ1 and second switch of the first switch tube arrives
When time is the shut-in time t1, the driving signal SRQ3 of third switching tube in the half-bridge-transformer-circuit of synchronous rectification
Stop with the driving signal SRQ4 of the 4th switching tube.
4. a kind of digital synchronous rectifier control device characterized by comprising
Driving signal acquiring unit, for obtaining the driving signal of first switch tube in half-bridge-transformer-circuit of synchronous rectification
The driving signal DRQ2 of DRQ1 and second switch；The driving signal DRQ1 of the first switch tube and the driving of second switch
Signal DRQ2 is the driving signal of two-way complementation；
Opening unit is triggered, for as the driving signal DRQ1 of the first switch tube and driving signal DRQ2 of second switch
Rising edge when arriving, trigger third switching tube in the half-bridge-transformer-circuit of synchronous rectification according to default opening time t2
Driving signal SRQ3 and the 4th switching tube driving signal SRQ4 open；
Closing unit is triggered, for as the driving signal DRQ1 of the first switch tube and driving signal DRQ2 of second switch
Failing edge arrive before, trigger third switching tube in the half-bridge-transformer-circuit of synchronous rectification according to default shut-in time t1
Driving signal SRQ3 and the 4th switching tube driving signal SRQ4 stop；
Threshold cell, for the driving signal SRQ3 of the default triggering third switching tube and the driving letter of the 4th switching tube
The opening time t2 and shut-in time t1 of number SRQ4, specifically, when the half-bridge-transformer-circuit of synchronous rectification work frequency
Rate be equal to or more than the half-bridge-transformer-circuit of synchronous rectification resonance frequency when, the default opening time t2 according to
Lag time in half-bridge-transformer-circuit of synchronous rectification determines that the default shut-in time t1 is same according to half-bridge-transformer-
The precision of lag time, series resonance inductor, resonant capacitance in step rectification circuit determines jointly；When the half-bridge-transformer-
When the working frequency of circuit of synchronous rectification is less than the half-bridge-transformer-circuit of synchronous rectification resonance frequency, described preset is beaten
ETAD expected time of arrival and departure t2 is determining according to the lag time in half-bridge-transformer-circuit of synchronous rectification, the default shut-in timeWherein, fr is the half-bridge-transformer-circuit of synchronous rectification resonance frequency, and fs is described
Half-bridge-transformer-circuit of synchronous rectification working frequency；
Half-bridge-transformer-the circuit of synchronous rectification further includes first capacitor, the second capacitor, the first inductance, the second inductance and change
Depressor；The anode of the first port connection power supply of the first switch tube Q1, the second port of the first switch tube Q1 and institute
The tie point for stating the first port of second switch Q2 is connect with one end of the first capacitor, and the of the second switch Q2
Two-port netwerk connects the cathode of the power supply, the cathode ground connection of the power supply；The other end of the first capacitor and first electricity
One end of sense connects；The other end of first inductance connect second inductance one end and the primary winding
The tie point of first port；At the beginning of the other end of second inductance connects second port and the transformer of the second switch Q2
The tie point of the second port of grade winding；The first port of the third switching tube Q3 and the first of the transformer secondary output winding
Port connection, the second port ground connection of the third switching tube Q3；The first port and the transformation of the 4th switching tube Q4
The second port of device secondary windings connects, and the second port of the 4th switching tube Q4 is connect with one end of second capacitor,
The other end of second capacitor is connect with the third port of the transformer secondary output winding；
The series resonance inductor includes first inductance and second inductance；The resonant capacitance includes first electricity
Hold and second capacitor.
5. digital synchronous rectifier control device as claimed in claim 4, which is characterized in that the triggering opening unit is also used
In when the rising edge of the driving signal DRQ1 of the first switch tube and the driving signal DRQ2 of second switch arrive, start
Timing, when the timing time reaches the opening time t2, the switch of the driving signal SRQ3 of the third switching tube and the 4th
The driving signal SRQ4 of pipe is opened.
6. digital synchronous rectifier control device as claimed in claim 5, which is characterized in that the triggering closing unit is also used
In when the failing edge of the driving signal DRQ1 of the first switch tube and the driving signal DRQ2 of second switch arrival before when
Between when being the shut-in time t1, in the half-bridge-transformer-circuit of synchronous rectification driving signal SRQ3 of third switching tube and
The driving signal SRQ4 of 4th switching tube stops.
7. a kind of Switching Power Supply characterized by comprising the digital synchronous rectification as described in any one of claim 4 to 6
Control device.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110317453A1 (en) * | 2010-06-28 | 2011-12-29 | Xiaodong Fan | Control circuit, control method, and power supply device |
| CN204465374U (en) * | 2015-03-18 | 2015-07-08 | 深圳市保益新能电气有限公司 | A kind of high-frequency isolation ac-dc conversion circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110317453A1 (en) * | 2010-06-28 | 2011-12-29 | Xiaodong Fan | Control circuit, control method, and power supply device |
| CN204465374U (en) * | 2015-03-18 | 2015-07-08 | 深圳市保益新能电气有限公司 | A kind of high-frequency isolation ac-dc conversion circuit |
Non-Patent Citations (1)
| Title |
|---|
| 超薄高效H-LCD电源关键技术的研究;范杰;《中国优秀硕士学位论文全文数据库信息科技辑》;20110815(第8期);第25-30页第3.1.3-3.1.4节，附图3.7.1、3.7.2、3.9 |
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