CN104158412A - Synchronous rectification module power supply integrating self-driving circuit and external driving circuit - Google Patents
Synchronous rectification module power supply integrating self-driving circuit and external driving circuit Download PDFInfo
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- CN104158412A CN104158412A CN201410348973.4A CN201410348973A CN104158412A CN 104158412 A CN104158412 A CN 104158412A CN 201410348973 A CN201410348973 A CN 201410348973A CN 104158412 A CN104158412 A CN 104158412A
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Abstract
The invention discloses a synchronous rectification module power supply integrating a self-driving circuit and an external driving circuit. The synchronous rectification module power supply comprises an input filter circuit, a switching circuit, a transformer isolated conversion circuit, an output rectifying circuit, an output filter circuit, a feedback circuit, a control circuit, the self-driving circuit and the external driving circuit. The module power supply has the advantages that the power supply output efficiency can be improved effectively; particularly, when the module power supply is applied to a low-voltage high-current circumstance, the output power can be more reliable and stable; the requirement on the input condition is relatively low due to the driving manner integrating self-driving and external driving, so that the input voltage range can be wider; as external driving signals and self-driving signals are kept in a relatively complemented relationship, when the external driving circuit is switched on, the self-driving circuit is switched off, and when the self-driving circuit is switched on, the external driving circuit is switched off. Therefore, simultaneous switching on of a rectifier tube and a follow current tube can be avoided effectively to avoid short circuit phenomena.
Description
Technical field
The present invention relates to electronic circuit field, be specifically related to the synchronous rectification modular power source that a kind of self-powered combines with outer crystal drive circuit.
Background technology
Along with the development of modular power source, all trades and professions increase year by year for the use amount of modular power source, use the mode of modular power source different, have diversified requirement for the performance of modular power source.For adapting to market condition now, the design of modular power source mainly consider following some, as the input range of module develop to wide input, the output of module will develop to low-voltage, high-current, the efficiency of module is wanted height, module will be to miniaturization development etc.Based on above-mentioned condition, current used modular power source generally includes input filter circuit, switching circuit, control circuit, transformer isolation translation circuit, output rectification circuit, output filter circuit and feedback circuit.But the electronic devices and components in modular power source can be subject to the impact of electromagnetic interference, the feedback signal that causes feedback unit to produce is unstable.For example, the frequency electromagnetic waves that transformer produces can cause interference to the conducting of MOS pipe and cut-off, cause the ON time of MOS pipe longer, make to flow through electric current amplification in the primary coil of transformer larger, make thus feedback signal sport high level signal by low level signal.This, high level signal will make the duty ratio of control unit pulse voltage do the adjustment making mistake moment, not only caused that power module output voltage is unstable, circuit power loss is larger, and its circuit more complicated, be difficult for miniaturization.
Summary of the invention
The technical problem to be solved in the present invention is to provide the synchronous rectification modular power source that a kind of self-powered combines with outer crystal drive circuit, and input range but also circuit that this modular power source not only can effectively obtain the output of stable power supply, reduce circuit loss, widen modular power source are simple and easy to miniaturization.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
The synchronous rectification modular power source that a kind of self-powered combines with outer crystal drive circuit, comprise input filter circuit, switching circuit, transformer isolation translation circuit, output rectification circuit, output filter circuit, feedback circuit, control circuit, also comprise self-driving circuit and outer crystal drive circuit, the input of described input filter circuit is connected with DC power supply, and its output is connected with the input of described transformer isolation translation circuit, the output of described control circuit respectively via described switching circuit; The output of described transformer isolation translation circuit is connected with the input of described output rectification circuit, the input of described self-driving circuit respectively; The output of described output rectification circuit is connected with the input of load, described feedback circuit respectively via described output filter circuit; The output of described feedback circuit is connected with the input of control circuit, and the output of described control circuit is connected with the input of output rectification circuit through outer crystal drive circuit, and the output of described self-driving circuit is connected with the input of output rectification circuit.
Described self-driving circuit is mainly made up of the first field effect transistor, two electric capacity, two diodes, voltage stabilizing didoe, multiple resistance; The source electrode of described the first field effect transistor is through the second resistance, the 3rd grounding through resistance, and the grid of the first field effect transistor divides two-way to be connected with the negative electrode of voltage stabilizing didoe, the negative electrode of the 3rd diode respectively; Described output rectification circuit has the second field effect transistor, transformer isolation translation circuit has the first transformer, the node of the anode of described the 3rd diode between the second resistance and the 3rd resistance is connected with the grid of the second field effect transistor, the drain electrode of described the first field effect transistor is connected with the secondary coil Same Name of Ends of the first transformer, the anode of described voltage stabilizing didoe is connected with the auxiliary winding different name end of the first transformer, and the grid of described the first field effect transistor is connected with the different name end of the auxiliary winding of the first transformer through the first resistance, the first electric capacity; The auxiliary Motor Winding Same Name of Ends of described the first transformer is connected with the anode of the first diode, the negative electrode of the first diode is connected with the grid of the first field effect transistor through the first resistance, described the second Capacitance parallel connection is at the two ends of voltage stabilizing didoe, and the anode of described voltage stabilizing didoe is connected with the earth terminal of the 3rd resistance.
Described self-driving circuit also comprises the second diode, and the negative electrode of described the second diode is connected with the negative electrode of the first diode, and the anode of the second diode is connected with the grid of the first field effect transistor.
Described outer crystal drive circuit comprises the second transformer, the 3rd electric capacity, the 4th diode and resistance, the primary coil Same Name of Ends of described the second transformer is connected with the output of control circuit, its different name end ground connection, the secondary coil different name end of described the second transformer is connected with the negative electrode of the 4th diode by the 3rd electric capacity, the anode of the 4th diode is connected with the secondary coil Same Name of Ends of the second transformer, described the 4th resistance is connected in parallel on the two ends of the 3rd electric capacity, the 5th resistance is connected in parallel on the two ends of the 4th diode, described output rectification circuit has the 3rd field effect transistor, the negative electrode of described the 4th diode is connected with the grid of the 3rd field effect transistor, the plus earth of the 4th diode.
Described outer crystal drive circuit also comprises the first triode, the second triode and the 6th resistance; The base stage of described the first triode is connected with the base stage of the second triode, the emitter of the first triode is connected with the collector electrode of the second triode, the collector electrode of the first triode is connected with the accessory power supply that inside modules produces through the 6th resistance, the emitter of the second triode is connected with the anode of the 4th diode, the base stage of the second triode is connected with the negative electrode of the 4th diode, and the grid of described the 3rd field effect transistor is connected with the emitter of the first triode.
The invention has the beneficial effects as follows: (1) modular power source of the present invention can effectively improve the delivery efficiency of power supply, be especially applied in low-voltage, high-current occasion, can allow power output more reliably more stable; Drive the type of drive combining with self-powered outward relative loose to the requirement of initial conditions, be applicable to wider input voltage range.(2) utilize MOSFET pipe to substitute rectifier diode and the fly-wheel diode in traditional rectification circuit, and control opening and turn-offing of MOSFET pipe with driving signal, rectification efficiency that can more effective raising rectification circuit, reduces circuit loss.(3) outer signal and the self-powered of driving drives signal keeping complementary relation, drives outward while opening, and self-powered drives and turn-offs; Self-powered drives while opening, drives and turn-offs outward, can effectively prevent that rectifying tube and continued flow tube are simultaneously open-minded, occurs the phenomenon of short circuit.(4) self-driving circuit combines auxiliary transformer winding and pressure limiting circuit, not only can realize wide range input, and can make be stabilized in+12V of rectifying tube driving voltage left and right, thereby makes the gate source voltage of rectifying tube unlikely too high.Self-driving circuit does not have loaded down with trivial details composition simultaneously, can reduce components and parts use amount, dwindles cost, contributes to compact power supply.(5) outer crystal drive circuit combines isolating transformer with push-pull circuit, not only can adapt to wide input voltage requirement, and can drive better afterflow metal-oxide-semiconductor, also can reduce components and parts use amount simultaneously, further dwindles cost.
Brief description of the drawings
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, the synchronous rectification modular power source that a kind of self-powered combines with outer crystal drive circuit, comprise input filter circuit 1, switching circuit 2, transformer isolation translation circuit 3, output rectification circuit 4, output filter circuit 5, feedback circuit 6, control circuit 7, also comprise self-driving circuit 8 and outer crystal drive circuit 9; The input of input filter circuit 1 is connected with DC power supply, and its output is connected with the input of transformer isolation translation circuit 3, the output of control circuit 7 respectively via switching circuit 2; The output of transformer isolation translation circuit 3 is connected with the input of output rectification circuit 4, the input of self-driving circuit 8 respectively; The output of output rectification circuit 4 is connected with the input of load, feedback control circuit 6 respectively via output filter circuit 1; The output of feedback circuit 6 is connected with the input of control circuit 7, and the output of control circuit 7 is connected with the input of output rectification circuit 4 through outer crystal drive circuit 9, and the output of self-driving circuit 8 is connected with the input of output rectification circuit 4.Self-driving circuit 8 and drive circuit 9 outward and combine, can widen the input voltage range of module, and conventional power module input range is 2:1, and modular power MOD can reach 60W/in
3, adopting foregoing circuit can realize input range is 4:1, and power density is up to 120W/in
3.
Self-driving circuit is mainly made up of the first field effect transistor Q1, two capacitor C 1, C2, two diode D1, D4, voltage stabilizing didoe D3, multiple resistance R 1, R2, R3, R4; The source electrode of the first field effect transistor Q1 is through the second resistance R 2, the 3rd resistance R 3 ground connection, and the grid of the first field effect transistor Q1 divides two-way to be connected with the negative electrode of voltage stabilizing didoe D3, the negative electrode of the 3rd diode D4 respectively; Output rectification circuit has the second field effect transistor Q6, transformer isolation translation circuit has the first transformer T1, the node of the anode of the 3rd diode D4 between the second resistance R 2 and the 3rd resistance R 3 is connected with the grid of the second field effect transistor Q6, the drain electrode of the first field effect transistor Q1 is connected with the secondary coil N2 Same Name of Ends of the first transformer T1, the anode of voltage stabilizing didoe D3 is connected with the auxiliary winding N3 different name end of the first transformer T1, and the grid of the first field effect transistor Q1 is connected with the different name end of the auxiliary winding N3 of the first transformer T1 through the first resistance R 1, the first capacitor C 1; The auxiliary winding N3 Same Name of Ends of the first transformer T1 is connected with the anode of the first diode D1, the negative electrode of the first diode D1 is connected with the grid of the first field effect transistor Q1 through the first resistance R 1, the second capacitor C 2 is connected in parallel on the two ends of voltage stabilizing didoe D3, and the anode of voltage stabilizing didoe D3 is connected with the earth terminal of the 3rd resistance R 3.
Self-driving circuit also comprises the second diode D2, and the negative electrode of the second diode D2 is connected with the negative electrode of the first diode D1, and the anode of the second diode D2 is connected with the grid of the first field effect transistor Q1.The second diode D2 can accelerate the switching speed of the first field effect transistor Q1, plays the effect that reduces switching loss.
Outer crystal drive circuit 9 comprises the second transformer T2, the 3rd capacitor C 3, the 4th diode D5 and resistance R 4, R5, the primary coil Same Name of Ends of the second transformer T2 is connected with the output of control circuit 7, its different name end ground connection, the secondary coil different name end of the second transformer T2 is connected with the negative electrode of the 4th diode D5 by the 3rd capacitor C 3, the anode of the 4th diode D5 is connected with the secondary coil Same Name of Ends of the second transformer T2, the 4th resistance R 4 is connected in parallel on the two ends of the 3rd capacitor C 3, the 5th resistance R 5 is connected in parallel on the two ends of the 4th diode D5, described output rectification circuit 4 has the 3rd field effect transistor Q7 and the 4th field effect transistor Q8, the negative electrode of the 4th diode D5 is connected with the grid of the 3rd field effect transistor Q7, the plus earth of the 4th diode D5.
Outer crystal drive circuit 9 also comprises the first triode Q2, the second triode Q3 and the 6th resistance R 6; The base stage of the first triode Q2 is connected with the base stage of the second triode Q3, the emitter of the first triode Q2 is connected with the collector electrode of the second triode Q3, the collector electrode of the first triode Q2 is connected with high level through the 6th resistance R 6, the emitter of the second triode Q3 is connected with the anode of the 4th diode D5, and the base stage of the second triode Q3 is connected with the negative electrode of the 4th diode D5.The first triode Q2 and the second triode Q3 can strengthen the driving force of the 3rd field effect transistor Q7 and the 4th field effect transistor Q8, thereby make the 3rd field effect transistor Q7 and the 4th field effect transistor Q8 be operated in optimum state.
In the time that modular power source is worked, 8 pin of control chip LM5025AMTCX produce identical pulse signal OUTA and the OUTB of two-way with 9 pin, and OUTA is used for driving main switch Q5; OUTB separates two-way, and a road drives clamper tube Q4, and the driving transformer of leading up to drives continued flow tube Q7, Q8.Rectifying part circuit working principle is as follows: when the second field effect transistor Q6 conducting, when the 3rd field effect transistor Q7 and the 4th field effect transistor Q8 turn-off, the second field effect transistor Q6, transformer secondary winding N2, inductance L 1, capacitor C 6 form charging circuit; When the second field effect transistor Q6 turn-offs, when the 3rd field effect transistor Q7 and the 4th field effect transistor Q8 open, inductance L 1, capacitor C 6, the 3rd field effect transistor Q7 and the 4th field effect transistor Q8 composition freewheeling circuit.The driving signal of the 3rd field effect transistor Q7 and the 4th field effect transistor Q8 is from external drive transformer T2, the driving signal of the driving signal of the 3rd field effect transistor Q7 and the 4th field effect transistor Q8 and the second field effect transistor Q6 is complementary and with dead band, in figure, VCC is 10V accessory power supply, wherein triode Q2, Q3 composition push-pull circuit, the load capacity of raising circuit.Here the push-pull circuit of external drive transformer T2 and triode Q2, Q3 composition is referred to as to outer crystal drive circuit.The driving of rectifying tube Q6 adopts self-driving circuit, within auxiliary winding N3 is controlled at certain scope by certain no-load voltage ratio by wide input voltage.The voltage stabilizing circuit that pressure limiting circuit mainly consists of metal-oxide-semiconductor Q1 and resistance R 2, R3 is realized voltage regulation result, rectifying tube Q6 driving voltage is after self-driving circuit is processed, substantially be stabilized in+12V, not only can make the driving voltage of the second field effect transistor Q6 within safe range, and can adapt to wide input voltage range.This drive circuit combines the feature of outer driving and self-driven technology, without special driving chip, utilizes driving transformer to realize driving isolation, can solve dead band and the common conduct problem of driving.
Claims (5)
1. the synchronous rectification modular power source that self-powered combines with outer crystal drive circuit, comprise input filter circuit, switching circuit, transformer isolation translation circuit, output rectification circuit, output filter circuit, feedback circuit, control circuit, it is characterized in that: also comprise self-driving circuit and outer crystal drive circuit, the input of described input filter circuit is connected with DC power supply, and its output is connected with the input of described transformer isolation translation circuit, the output of described control circuit respectively via described switching circuit; The output of described transformer isolation translation circuit is connected with the input of described output rectification circuit, the input of described self-driving circuit respectively; The output of described output rectification circuit is connected with the input of load, described feedback circuit respectively via described output filter circuit; The output of described feedback circuit is connected with the input of control circuit, and the output of described control circuit is connected with the input of output rectification circuit through outer crystal drive circuit, and the output of described self-driving circuit is connected with the input of output rectification circuit.
2. the synchronous rectification modular power source that a kind of self-powered according to claim 1 combines with outer crystal drive circuit, is characterized in that: described self-driving circuit is mainly made up of the first field effect transistor (Q1), two electric capacity (C1, C2), two diodes (D1, D4), voltage stabilizing didoe (D3), multiple resistance (R1, R2, R3, R4), the source electrode of described the first field effect transistor (Q1) is through the second resistance (R2), the 3rd resistance (R3) ground connection, and the grid of the first field effect transistor (Q1) divides two-way to be connected with the negative electrode of voltage stabilizing didoe (D3), the negative electrode of the 3rd diode (D4) respectively, described output rectification circuit has the second field effect transistor (Q6), transformer isolation translation circuit has the first transformer (T1), the node of the anode of described the 3rd diode (D4) between the second resistance (R2) and the 3rd resistance (R3) is connected with the grid of the second field effect transistor (Q6), the drain electrode of described the first field effect transistor (Q1) is connected with secondary coil (N2) Same Name of Ends of the first transformer (T1), the anode of described voltage stabilizing didoe (D3) is connected with auxiliary winding (N3) the different name end of the first transformer (T1), the grid of described the first field effect transistor (Q1) is through the first resistance (R1), the first electric capacity (C1) is connected with the different name end of the auxiliary winding (N3) of the first transformer (T1), auxiliary winding (N3) Same Name of Ends of described the first transformer (T1) is connected with the anode of the first diode (D1), the negative electrode of the first diode (D1) is connected with the grid of the first field effect transistor (Q1) through the first resistance (R1), described the second electric capacity (C2) is connected in parallel on the two ends of voltage stabilizing didoe (D3), and the anode of described voltage stabilizing didoe (D3) is connected with the earth terminal of the 3rd resistance (R3).
3. the synchronous rectification modular power source that a kind of self-powered according to claim 2 combines with outer crystal drive circuit, it is characterized in that: described self-driving circuit also comprises the second diode (D2), the negative electrode of described the second diode (D2) is connected with the negative electrode of the first diode (D1), and the anode of the second diode (D2) is connected with the grid of the first field effect transistor (Q1).
4. the synchronous rectification modular power source that a kind of self-powered according to claim 1 combines with outer crystal drive circuit, is characterized in that: described outer crystal drive circuit comprises the second transformer (T2), the 3rd electric capacity (C3), the 4th diode (D5) and resistance (R4, R5), the primary coil Same Name of Ends of described the second transformer (T2) is connected with the output of control circuit, its different name end ground connection, the secondary coil different name end of described the second transformer (T2) is connected with the negative electrode of the 4th diode (D5) by the 3rd electric capacity (C3), the anode of the 4th diode (D5) is connected with the secondary coil Same Name of Ends of the second transformer (T2), described the 4th resistance (R4) is connected in parallel on the two ends of the 3rd electric capacity (C3), the 5th resistance (R5) is connected in parallel on the two ends of the 4th diode (D5), described output rectification circuit has the 3rd field effect transistor (Q7), the negative electrode of described the 4th diode (D5) is connected with the grid of the 3rd field effect transistor (Q7), the plus earth of the 4th diode (D5).
5. the synchronous rectification modular power source that a kind of self-powered according to claim 4 combines with outer crystal drive circuit, is characterized in that: described outer crystal drive circuit also comprises the first triode (Q2), the second triode (Q3) and the 6th resistance (R6); The base stage of described the first triode (Q2) is connected with the base stage of the second triode (Q3), the emitter of the first triode (Q2) is connected with the collector electrode of the second triode (Q3), the collector electrode of the first triode (Q2) is connected with power supply through the 6th resistance (R6), the emitter of the second triode (Q3) is connected with the anode of the 4th diode (D5), the base stage of the second triode (Q3) is connected with the negative electrode of the 4th diode (D5), and the grid of described the 3rd field effect transistor (Q7) is connected with the emitter of the first triode (Q2).
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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 | 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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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 | 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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