CN104158412B - The synchronous rectification modular power source that a kind of self-powered is combined with outer crystal drive circuit - Google Patents
The synchronous rectification modular power source that a kind of self-powered is combined with outer crystal drive circuit Download PDFInfo
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- CN104158412B CN104158412B CN201410348973.4A CN201410348973A CN104158412B CN 104158412 B CN104158412 B CN 104158412B CN 201410348973 A CN201410348973 A CN 201410348973A CN 104158412 B CN104158412 B CN 104158412B
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Abstract
The synchronous rectification modular power source that a kind of self-powered of the present invention is combined with outer crystal drive circuit, including input filter circuit, on-off circuit, transformer isolation translation circuit, output rectification circuit, output filter circuit, feedback circuit, control circuit, self-driving circuit and outer crystal drive circuit.Modular power source of the present invention can effectively improve the delivery efficiency of power supply, especially apply in low-voltage, high-current occasion, and power output can be allowed more reliable more stable；The outer requirement relative loose for driving the type of drive being combined with self-powered to input condition, it is adaptable to broader input voltage range.It is outer to drive the relation that drive signal remains complementation with self-powered drive signal, when outer drive driving is opened, self-powered driving shut-off；When self-powered driving is opened, outer drive driving shut-off can effectively prevent rectifying tube simultaneously open-minded with continued flow tube, the phenomenon for short circuit occur.
Description
Technical field
The present invention relates to electronic circuit field, and in particular to the synchronous rectification module that a kind of self-powered is combined with outer crystal drive circuit
Power supply.
Background technology
With the development of modular power source, all trades and professions increase year by year for the usage amount of modular power source, use modular power source
Mode it is different, have diversified requirement for the performance of modular power source.To adapt to market condition now, module
The design of power supply mainly consider it is following some, such as input range of module develops to width input, and the output of module is big to low pressure
Electric current develops, and the efficiency of module is high, and module will be to miniaturization etc..Based on above-mentioned condition, used module is electric at present
Source generally includes input filter circuit, on-off circuit, control circuit, transformer isolation translation circuit, output rectification circuit, output
Filter circuit and feedback circuit.However, the electronic component in modular power source can be influenceed by electromagnetic interference, cause feedback
Feedback signal produced by member is unstable.For example, the frequency electromagnetic waves produced by transformer can be made to the conducting and cut-off of metal-oxide-semiconductor
Into interference, cause the ON time of metal-oxide-semiconductor longer, the electric current amplification for making to flow through in the primary coil of transformer is larger, thus makes
Feedback signal sports high level signal by low level signal.The moment high level signal will make control unit pulse voltage
Dutycycle make the adjustment that makes mistake, do not only result in that power module output voltage is unstable, circuit power loss is larger, Er Qieqi
Circuit is more complicated, be difficult miniaturization.
The content of the invention
The technical problem to be solved in the present invention is to provide the synchronous rectification module electricity that a kind of self-powered is combined with outer crystal drive circuit
Source, the modular power source not only can effectively obtain stable power supply output, the input for reducing circuit loss, widening modular power source
Scope and circuit is simply easily minimized.
In order to solve the above technical problems, the present invention uses following technical scheme：
The synchronous rectification modular power source that a kind of self-powered is combined with outer crystal drive circuit, including input filter circuit, on-off circuit,
Transformer isolation translation circuit, output rectification circuit, output filter circuit, feedback circuit, control circuit, in addition to self-driving circuit
With outer crystal drive circuit, the input of the input filter circuit is connected with dc source, and its output end is via the on-off circuit point
Input, the output end of the control circuit not with the transformer isolation translation circuit are connected；The transformer isolation becomes
Input, the input of the self-driving circuit of the output end of circuit respectively with the output rectification circuit is changed to be connected；It is described defeated
Go out input of the output end of rectification circuit via the output filter circuit respectively with load, the feedback circuit to be connected；Institute
The output end of feedback circuit is stated with controlling the input of circuit to be connected, the output end of the control circuit is through outer crystal drive circuit and output
The input of rectification circuit is connected, and the output end of the self-driving circuit is connected with the input of output rectification circuit.
The self-driving circuit is main by the first FET, two electric capacity, two diodes, voltage-regulator diode, Duo Ge electricity
Resistance composition；The source electrode of first FET is grounded through second resistance, 3rd resistor, the grid point two-way of the first FET
Negative electrode, the negative electrode of the 3rd diode respectively with voltage-regulator diode is connected；The output rectification circuit have the second FET,
Transformer isolation translation circuit has the first transformer, and the anode of the 3rd diode is through between second resistance and 3rd resistor
Node be connected with the grid of the second FET, first FET drain electrode and the first transformer secondary coil it is same
Name end is connected, and the anode of the voltage-regulator diode is connected with the assists winding different name end of the first transformer, first field-effect
The grid of pipe is connected through first resistor, the first electric capacity with the different name end of the assists winding of the first transformer；First transformer
Assists winding Same Name of Ends be connected with the anode of the first diode, the negative electrode of the first diode is through first resistor and the first field-effect
The grid of pipe is connected, and second electric capacity is connected in parallel on the two ends of voltage-regulator diode, the anode of the voltage-regulator diode and the 3rd electricity
The earth terminal of resistance is connected.
The self-driving circuit also includes the second diode, the negative electrode of second diode and the negative electrode phase of the first diode
Even, the anode of the second diode is connected with the grid of the first FET.
The outer crystal drive circuit includes the second transformer, the 3rd electric capacity, the 4th diode and resistance；Second transformer
Primary coil Same Name of Ends is with controlling the output end of circuit to be connected, and its different name end ground connection, the secondary coil of second transformer is different
Name end is connected by the 3rd electric capacity with the negative electrode of the 4th diode, the anode of the 4th diode and the secondary coil of the second transformer
Same Name of Ends is connected, and the 4th resistor coupled in parallel is at the two ends of the 3rd electric capacity, and the 5th resistor coupled in parallel is at the two ends of the 4th diode, institute
Output rectification circuit is stated with the 3rd FET, the negative electrode of the 4th diode is connected with the grid of the 3rd FET,
The plus earth of 4th diode.
The outer crystal drive circuit also includes the first triode, the second triode and the 6th resistance；The base of first triode
Pole is connected with the base stage of the second triode, and the emitter stage of the first triode is connected with the emitter stage of the second triode, the one or three pole
The colelctor electrode of pipe is connected through the 6th resistance with the accessory power supply that inside modules are produced, the colelctor electrode of the second triode and the four or two pole
The anode of pipe is connected, and the base stage of the second triode is connected with the negative electrode of the 4th diode, the grid of the 3rd FET and
The emitter stage of first triode is connected.
The beneficial effects of the invention are as follows：(1) modular power source of the present invention can effectively improve the output effect of power supply
Rate, is especially applied in low-voltage, high-current occasion, and power output can be allowed more reliable more stable；It is outer to drive the driving being combined with self-powered
Requirement relative loose of the mode to input condition, it is adaptable to broader input voltage range.(2) biography is substituted using MOSFET pipes
The commutation diode and fly-wheel diode united in rectification circuit, and control with drive signal opening and turning off for MOSFET pipes,
The rectification efficiency of rectification circuit can be more effectively improved, circuit loss is reduced.(3) drive signal and self-powered drive signal are driven outside
The relation of complementation is remain, when outer drive driving is opened, self-powered driving shut-off；When self-powered driving is opened, outer drive driving shut-off can have
The phenomenon for preventing rectifying tube simultaneously open-minded with continued flow tube, short circuit occur of effect.(4) self-driving circuit is by transformer assists winding and limit
Volt circuit is combined, and can not only realize wide range input, and rectifying tube driving voltage can be made stable left in+12V
The right side, so that the gate source voltage of rectifying tube is unlikely too high.Self-driving circuit does not have cumbersome composition simultaneously, it is possible to reduce component makes
Consumption, reduces cost, contributes to compact power supply.(5) isolating transformer is combined by outer crystal drive circuit with push-pull circuit, not only may be used
To adapt to wide input voltage requirement, and it can preferably drive afterflow metal-oxide-semiconductor, while component usage amount can also be reduced,
It is further to reduce cost.
Brief description of the drawings
Fig. 1 is circuit block diagram of the invention；
Fig. 2 is circuit diagram of the invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, the synchronous rectification modular power source that a kind of self-powered is combined with outer crystal drive circuit, including input filter circuit
1st, on-off circuit 2, transformer isolation translation circuit 3, output rectification circuit 4, output filter circuit 5, feedback circuit 6, control electricity
Road 7, in addition to self-driving circuit 8 and outer crystal drive circuit 9；The input of input filter circuit 1 is connected with dc source, its output end warp
By the input respectively with transformer isolation translation circuit 3 of on-off circuit 2, the output end of circuit 7 is controlled to be connected；Transformer isolation
Input, the input of self-driving circuit 8 of the output end of translation circuit 3 respectively with output rectification circuit 4 are connected；Export rectified current
Input of the output end on road 4 via output filter circuit 1 respectively with load, feedback control circuit 6 is connected；Feedback circuit 6
Output end is with controlling the input of circuit 7 to be connected, and the output end of control circuit 7 is defeated through outer crystal drive circuit 9 and output rectification circuit 4
Enter end to be connected, the output end of self-driving circuit 8 is connected with the input of output rectification circuit 4.Circuit 9 is removed in self-driving circuit 8 and outer drive
It is combined, the input voltage range of module can be widened, conventional power module input range is 2:1, modular power MOD is reachable
To 60W/in3, use foregoing circuit that input range can be realized for 4:1, and power density is up to 120W/in3。
Self-driving circuit is main by the first FET Q1, two electric capacity C1, C2, two diode D1, D4, voltage-regulator diodes
D3, multiple resistance R1, R2, R3, R4 composition；First FET Q1 source electrode is grounded through second resistance R2,3rd resistor R3, the
One FET Q1 grid point negative electrode, the 3rd diode D4 negative electrode of two-way respectively with voltage-regulator diode D3 is connected；Output
There is rectification circuit the second FET Q6, transformer isolation translation circuit to have the first transformer T1, the 3rd diode D4's
Anode is connected through the node between second resistance R2 and 3rd resistor R3 with the second FET Q6 grid, the first FET
Q1 drain electrode is connected with the first transformer T1 secondary coil N2 Same Name of Ends, voltage-regulator diode D3 anode and the first transformer T1
Assists winding N3 different names end be connected, the first FET Q1 grid is through first resistor R1, the first electric capacity C1 and the first transformation
Device T1 assists winding N3 different name end is connected；The sun of first transformer T1 assists winding N3 Same Name of Ends and the first diode D1
Extremely it is connected, the first diode D1 negative electrode is connected through first resistor R1 with the first FET Q1 grid, and the second electric capacity C2 is simultaneously
Voltage-regulator diode D3 two ends are associated in, voltage-regulator diode D3 anode is connected with 3rd resistor R3 earth terminal.
Self-driving circuit also includes the second diode D2, the negative electrode phase of the second diode D2 negative electrode and the first diode D1
Even, the second diode D2 anode is connected with the first FET Q1 grid.Second diode D2 can accelerate first effect
Should pipe Q1 switching speed, play a part of reduce switching loss.
Outer crystal drive circuit 9 includes the second transformer T2, the 3rd electric capacity C3, the 4th diode D5 and resistance R4, R5；Second transformation
Device T2 primary coil Same Name of Ends is with controlling the output end of circuit 7 to be connected, its different name end ground connection, the second transformer T2 secondary wire
Circle different name end is connected by the 3rd electric capacity C3 with the 4th diode D5 negative electrode, the 4th diode D5 anode and the second transformer
T2 secondary coil Same Name of Ends is connected, and the 4th resistance R4 is connected in parallel on the 3rd electric capacity C3 two ends, and the 5th resistance R5 is connected in parallel on the 4th
Diode D5 two ends, the output rectification circuit 4 has the 3rd FET Q7 and the 4th FET Q8, the 4th diode
D5 negative electrode is connected with the 3rd FET Q7 grid, the 4th diode D5 plus earth.
Outer crystal drive circuit 9 also includes the first triode Q2, the second triode Q3 and the 6th resistance R6；First triode Q2 base
Pole is connected with the second triode Q3 base stage, and the first triode Q2 emitter stage is connected with the second triode Q3 emitter stage, the
One triode Q2 colelctor electrode is connected through the 6th resistance R6 with high level, the second triode Q3 colelctor electrode and the 4th diode D5
Anode be connected, the second triode Q3 base stage is connected with the 4th diode D5 negative electrode.First triode Q2 and the two or three pole
Pipe Q3 can strengthen the 3rd FET Q7 and the 4th FET Q8 driving force, so that the 3rd FET Q7 and
Four FET Q8 are operated in optimum state.
When modular power source works, control chip LM5025AMTCX 8 pin and 9 pin produce two-way identical pulse signal
OUTA and OUTB, OUTA are used to drive main switch Q5；OUTB separates two-way, and clamper tube Q4 is driven all the way, and a-road-through is overdrived
Transformer driving continued flow tube Q7, Q8.Rectifying part circuit operation principle is as follows：When the second FET Q6 conductings, the 3rd effect
Should pipe Q7 and the 4th FET Q8 shut-off when, the second FET Q6, transformer secondary winding N2, inductance L1, electric capacity C6 groups
Into charging circuit；When the second FET Q6 shut-offs, when the 3rd FET Q7 and the 4th FET Q8 are opened, inductance L1,
Electric capacity C6, the 3rd FET Q7 and the 4th FET Q8 composition freewheeling circuits.3rd FET Q7 and the 4th field-effect
Pipe Q8 drive signal from external drive transformer T2, the 3rd FET Q7 and the 4th FET Q8 drive signal with
Second FET Q6 drive signal is complementary and with dead band, and VCC is 10V accessory power supplys, wherein triode Q2, Q3 groups in figure
Into push-pull circuit, the load capacity of circuit is improved.Here electricity is recommended by what external drive transformer T2 and triode Q2, Q3 were constituted
Road is referred to as outer crystal drive circuit.Rectifying tube Q6 driving uses self-driving circuit, and assists winding N3 is inputted width by certain no-load voltage ratio
Voltage control is within the scope of certain.The mu balanced circuit that pressure limiting circuit is mainly made up of metal-oxide-semiconductor Q1 and resistance R2, R3 is come real
Existing voltage regulation result, rectifying tube Q6 driving voltages are stablized after self-driving circuit is handled, substantially in+12V, can not only make second
FET Q6 driving voltage is adapted to wide input voltage range within safe range.The drive circuit is combined
The characteristics of outer driving and self-driven technology, without special driving chip, driving isolation is realized using driving transformer, can be with
Solve the problems, such as driving dead band and common conduct.
Claims (4)
1. the synchronous rectification modular power source that a kind of self-powered is combined with outer crystal drive circuit, including input filter circuit, on-off circuit, change
Depressor isolated variable circuit, output rectification circuit, output filter circuit, feedback circuit, control circuit, it is characterised in that：Also wrap
Self-driving circuit and outer crystal drive circuit are included, the input of the input filter circuit is connected with dc source, and its output end is via described
On-off circuit input respectively with the transformer isolation translation circuit, the output end of the control circuit are connected；It is described to become
The output end of depressor isolated variable circuit input respectively with the output rectification circuit, the input phase of the self-driving circuit
Even；The output end of the output rectification circuit via the output filter circuit respectively with load, the feedback circuit input
End is connected；The output end of the feedback circuit is with controlling the input of circuit to be connected, and the output end of the control circuit is driven through outer
Circuit is connected with the input of output rectification circuit, the output end of the self-driving circuit and the input phase of output rectification circuit
Even；The self-driving circuit is main by the first FET（Q1）, the first electric capacity（C1）, the second electric capacity（C2）, the first diode
（D1）, the 3rd diode（D4）, voltage-regulator diode（D3), first resistor（R1）, second resistance（R2）And 3rd resistor（R3）Group
Into；First FET（Q1）Source electrode through second resistance（R2）, 3rd resistor (R3) ground connection, the first FET（Q1）
Grid point two-way respectively with voltage-regulator diode（D3 negative electrode, the 3rd diode)（D4）Negative electrode be connected；The output rectification
Circuit has the second FET（Q6), transformer isolation translation circuit has the first transformer（T1）, the 3rd diode
（D4）Anode through second resistance（R2）Node and the second FET between 3rd resistor (R3)（Q6）Grid be connected,
First FET（Q1）Drain electrode and the first transformer（T1）Secondary coil（N2）Same Name of Ends is connected, the voltage stabilizing two
Pole pipe（D3 anode and the first transformer)（T1）Assists winding（N3）Different name end is connected, first FET（Q1）'s
Grid is through first resistor（R1）, the first electric capacity（C1）With the first transformer（T1）Assists winding（N3）Different name end be connected；Institute
State the first transformer（T1）Assists winding（N3）Same Name of Ends and the first diode（D1）Anode be connected, the first diode（D1）
Negative electrode through first resistor（R1）With the first FET（Q1）Grid be connected, second electric capacity（C2）It is connected in parallel on voltage stabilizing two
Pole pipe（D3）Two ends, the voltage-regulator diode（D3）Anode be connected with the earth terminal of 3rd resistor (R3).
2. the synchronous rectification modular power source that a kind of self-powered according to claim 1 is combined with outer crystal drive circuit, its feature exists
In：The self-driving circuit also includes the second diode（D2）, second diode（D2）Negative electrode and the first diode（D1）
Negative electrode be connected, the second diode（D2）Anode and the first FET（Q1）Grid be connected.
3. the synchronous rectification modular power source that a kind of self-powered according to claim 1 is combined with outer crystal drive circuit, its feature exists
In：The outer crystal drive circuit includes the second transformer（T2）, the 3rd electric capacity（C3）, the 4th diode（D5）, the 4th resistance（R4）With
5th resistance（R5）；Second transformer（T2）Primary coil Same Name of Ends with control circuit output end be connected, its different name
End ground connection, second transformer（T2）Secondary coil different name end pass through the 3rd electric capacity（C3）With the 4th diode（D5）The moon
Extremely it is connected, the 4th diode（D5）Anode and the second transformer（T2）Secondary coil Same Name of Ends be connected, the 4th resistance
（R4）It is connected in parallel on the 3rd electric capacity（C3）Two ends, the 5th resistance（R5）It is connected in parallel on the 4th diode（D5）Two ends, the output
Rectification circuit has the 3rd FET（Q7）, the 4th diode（D5）Negative electrode and the 3rd FET（Q7）Grid
It is connected, the 4th diode（D5）Plus earth.
4. the synchronous rectification modular power source that a kind of self-powered according to claim 3 is combined with outer crystal drive circuit, its feature exists
In：The outer crystal drive circuit also includes the first triode（Q2）, the second triode（Q3）With the 6th resistance（R6）；One or three pole
Pipe（Q2）Base stage and the second triode（Q3）Base stage be connected, the first triode（Q2）Emitter stage and the second triode（Q3）
Emitter stage be connected, the first triode（Q2）Colelctor electrode through the 6th resistance（R6）It is connected with power supply, the second triode（Q3）'s
Colelctor electrode and the 4th diode（D5）Anode be connected, the second triode（Q3）Base stage and the 4th diode（D5）Negative electrode phase
Even, the 3rd FET（Q7）Grid and the first triode（Q2）Emitter stage be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410348973.4A CN104158412B (en) | 2014-07-22 | 2014-07-22 | The synchronous rectification modular power source that a kind of self-powered is combined with outer crystal drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410348973.4A CN104158412B (en) | 2014-07-22 | 2014-07-22 | The synchronous rectification modular power source that a kind of self-powered is combined with outer crystal drive circuit |
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| CN104158412A CN104158412A (en) | 2014-11-19 |
| CN104158412B true CN104158412B (en) | 2017-07-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081432A (en) * | 1998-05-26 | 2000-06-27 | Artesyn Technologies, Inc. | Active reset forward converter employing synchronous rectifiers |
| CN1481066A (en) * | 2003-06-19 | 2004-03-10 | 艾默生网络能源有限公司 | BUCK convertor containing synchronous rectitication drive circuit |
| CN101917121A (en) * | 2010-07-15 | 2010-12-15 | 电子科技大学 | An Active Clamp Synchronous Rectification Forward Converter |
| CN204068739U (en) * | 2014-07-22 | 2014-12-31 | 合肥华耀电子工业有限公司 | The synchronous rectification modular power source that a kind of self-powered combines with outer crystal drive circuit |
-
2014
- 2014-07-22 CN CN201410348973.4A patent/CN104158412B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081432A (en) * | 1998-05-26 | 2000-06-27 | Artesyn Technologies, Inc. | Active reset forward converter employing synchronous rectifiers |
| CN1481066A (en) * | 2003-06-19 | 2004-03-10 | 艾默生网络能源有限公司 | BUCK convertor containing synchronous rectitication drive circuit |
| CN101917121A (en) * | 2010-07-15 | 2010-12-15 | 电子科技大学 | An Active Clamp Synchronous Rectification Forward Converter |
| CN204068739U (en) * | 2014-07-22 | 2014-12-31 | 合肥华耀电子工业有限公司 | The synchronous rectification modular power source that a kind of self-powered combines with outer crystal drive circuit |
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| CN104158412A (en) | 2014-11-19 |
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