CN103280959B - Synchronous rectification circuit of switching power supply converter - Google Patents
Synchronous rectification circuit of switching power supply converter Download PDFInfo
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- 238000004804 winding Methods 0.000 claims abstract description 97
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Abstract
The invention discloses a synchronous rectification circuit of a switching power supply converter, which comprises a transformer, a synchronous finishing output circuit connected with a primary coil winding of the transformer, and a control circuit connected between a secondary coil winding of the transformer and a power supply load; the control circuit is formed by connecting at least a switching tube, a first chip and a second chip, wherein the first chip and the second chip are connected to the positive end of the secondary coil winding after being connected, and are connected between the input end and the control end of the switching tube; the output end of the switching tube is connected with the reverse end of the secondary coil winding; and a one-way conduction element is arranged on a branch circuit of the second chip connected with the output end of the switch tube, so that reverse current generated by induction of the secondary coil winding is blocked from flowing into the second chip through the branch circuit.
Description
Technical field
The present invention relates to a kind of switching power circuit field, relate more specifically to the switching power converters circuit of synchronous rectification that the temperature rise of a kind of part restrictor device is too high.
Background technology
Fig. 1 is the switching power converters circuit of synchronous rectification representing prior art, comprises the synchronous arrangement output circuit 11 that transformer T1 connects with the primary coil winding L 1 of described transformer T1, the second control circuit 22 being connected to the first control circuit 21 between the secondary coil winding L 2 of described transformer and power source loads R10 and being connected between the secondary coil winding L 3 of described transformer and power source loads R10.Described first control circuit 21 is the same with the internal structure of second control circuit 22, such as, get first control circuit 21 to specifically describe, comprise switch mosfet pipe Q5, the first chip U1 (MMDT4413) and the second chip U2 (MMDT4401), wherein, described U1 and U2 is integrated circuit, and it is equivalent to the discrete component composition in square frame.
Concrete, described first chip U1 comprises the 3rd triode Q3 and the 4th triode Q4, the emitter of described 3rd triode Q3 is connected with the emitter of described 4th triode Q4, and be connected to the grid of described switching tube Q5, the collector electrode of described 3rd triode Q3 connects one end of described secondary coil winding L 2, the collector electrode of described 4th triode Q4 connects the source electrode of described switching tube Q5, described 3rd triode Q3 is connected with the base stage of the 4th triode Q4, and is connected to the source electrode of switching tube Q5 by resistance R1; The drain electrode of described switching tube connects the other end of described secondary coil winding L 2.Described second chip comprises the first triode Q1 and the second triode Q2, the emitter of described second triode Q2 connects the source electrode of described switching tube Q5, collector electrode connects the base stage of described 3rd triode Q3, and one end of described secondary coil winding L 2 is connected to by resistance R2, base stage connects the base stage of described first triode Q1; One end that the emitter of described first triode Q1 is connected to described secondary coil winding L 2 by resistance R3, connect its base stage, the collector electrode of described first triode Q1 is connected to the drain electrode of described switching tube Q5 by resistance R4 simultaneously.
Concrete, the electric current of each winding of L1, L2, L3 within each work period of transformer T1 is made up of forward current and reverse current, and the sense of current and phase place are determined by the Same Name of Ends of winding.And the first triode Q1 of the second control chip U2 inside can equivalence become diode D3 to understand, as shown in Figure 1.L1 winding positive half period and negative half-cycle conducting in turn within each work period in transformer T1, and inner winding L 2 the inductive current direction phase place of L3 contrary, when winding L 2 sense of current is towards (winding L 2 reverse current) during the direction of the arrow 1 in Fig. 1, switching tube Q5 closes, but reverse current can flow through the first triode Q1 of R4 → the second control chip U2 inside (as shown in FIG., first triode Q1 can be equivalent to diode D3 ') other end of the load R10 of the be knot → power supply of the second triode Q2 of → the second control chip U2 inside → get back to winding L 2 forms loop.The reason forming reverse current on this loop is caused by the first triode Q1 (equivalent diode D3) reverse recovery time of the second control chip U2 inside is grown, the reverse current in this loop is directly proportional to power source loads and operating frequency, if operating frequency is higher and power source loads is heavier, thus causing the reverse current of this branch road, larger (reverse recovery time is a characterisitic parameter of diode, reverse recovery time, the longer reverse current of diode that causes was larger), this electric current causes the second control chip U2 to generate heat serious and temperature rising more than 65 degree is (same, the second control chip U4 that also can have influence on second control circuit 22 generates heat seriously and temperature rising more than 65 degree), thus affect the work of switching power converters to a certain extent, reduce the life-span that product uses.
Summary of the invention
The object of this invention is to provide a kind of switching power converters circuit of synchronous rectification, heating and the temperature that effectively can reduce control chip raise, thus improve the useful life of product.
For achieving the above object, the invention provides a kind of switching power converters circuit of synchronous rectification, comprise the synchronous arrangement output circuit of transformer and the primary coil winding switching of described transformer, be connected to control circuit between the secondary coil winding of described transformer and power source loads; Described control circuit is is at least connected and composed by switching tube, the first chip and the second chip, is connected to the forward end of described secondary coil winding after described first chip is connected with the second chip, and between the input being connected to described switching tube and control end; The output of described switching tube connects the backward end of described secondary coil winding; It is characterized in that, the branch road that described second chip is connected with the output of described switching tube is provided with one-way conduction original paper, thus the described branch road that reverses current through blocking described secondary coil winding induction generation flows into described second chip.
As the improvement of such scheme, described one-way conduction original paper is diode.
As the improvement of such scheme, described first chip comprises the 3rd triode Q3 and the 4th triode Q4, the emitter of described 3rd triode Q3 is connected with the emitter of described 4th triode Q4, and be connected to the grid of described switching tube, the collector electrode of described 3rd triode Q3 connects the forward end of described secondary coil winding, the collector electrode of described 4th triode Q4 connects the source electrode of described switching tube, described 3rd triode Q3 is connected with the base stage of the 4th triode Q4, and is connected to the source electrode of switching tube by resistance R1; The drain electrode of described switching tube connects the backward end of described secondary coil winding; Described second chip comprises the first triode Q1 and the second triode Q2, the emitter of described second triode Q2 connects the source electrode of described switching tube, collector electrode connects the base stage of described 3rd triode Q3, and the forward end of described secondary coil winding is connected to by resistance R2, base stage connects the base stage of described first triode Q1; The forward end that the emitter of described first triode Q1 is connected to described secondary coil winding by resistance R3, connect its base stage, the collector electrode of described first triode Q1 is connected to the drain electrode of described switching tube by resistance R4 and described diode D1 simultaneously.
As the improvement of such scheme, described switching tube is MOSFET pipe, and described first triode Q1, the second triode Q2 and the 3rd triode Q3 are NPN triode, and described 4th triode Q4 is PNP triode.
As the improvement of such scheme, described secondary coil winding comprises multiple winding, and each winding switching correspondence connects a described control circuit, and connects an isolation capacitance between each control circuit.
As the improvement of such scheme, described secondary coil winding comprises two windings, and the inductive current direction phase place of two windings is contrary.
As the improvement of such scheme, described synchronous arrangement output circuit can be single-ended reverse exciting, half-bridge or LLC topology and synchronously arranges output circuit.
As the improvement of such scheme, between described control circuit and power source loads, also connect filter circuit.Compared with prior art, switching power converters circuit of synchronous rectification of the present invention is by arranging increase one-way conduction element (diode), thus the described branch road that reverses current through blocking described secondary coil winding induction generation flows into chip.Concrete, make the control chip of control circuit be connected to the drain electrode of switching tube by the resistance of connecting and diode.Like this, the reverse current flowing through resistance is blocked by diode, thus limits the formation of this reverse current, and then effectively reduces the heating of control chip, improves circuit reliability, thus improves the useful life of product.
By following description also by reference to the accompanying drawings, the present invention will become more clear, and these accompanying drawings are for explaining embodiments of the invention.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the switching power converters circuit of synchronous rectification of prior art;
Fig. 2 is the circuit diagram of the first embodiment of switching power converters circuit of synchronous rectification of the present invention;
Fig. 3 is the circuit diagram of the second embodiment of switching power converters circuit of synchronous rectification of the present invention;
Fig. 4 is the circuit diagram of the 3rd embodiment of switching power converters circuit of synchronous rectification of the present invention.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, element numbers similar in accompanying drawing represents similar element.
Embodiment 1
Please refer to Fig. 2, is the circuit diagram of the first embodiment of switching power converters circuit of synchronous rectification of the present invention.Described switching power converters circuit of synchronous rectification comprises synchronous arrangement output circuit 11 that transformer T1 connects with the primary coil winding L 1 of described transformer T1, control circuit 21 between the secondary coil winding L 2 being connected to described transformer T1 and power source loads R10.Described control circuit 21 comprises switching tube Q5 (MOSFET), the first chip U1 (MMDT4413) and the second chip U2 (MMDT4401), wherein, described U1 and U2 is integrated circuit, and it is equivalent to the discrete component composition in square frame.
Concrete, described first chip U1 comprises the 3rd triode Q3 and the 4th triode Q4, the emitter of described 3rd triode Q3 is connected with the emitter of described 4th triode Q4, and be connected to the grid of described switching tube Q5 simultaneously, the collector electrode of described 3rd triode Q3 connects the forward end of described secondary coil winding L 2, the collector electrode of described 4th triode Q4 connects the source electrode of described switching tube Q5, described 3rd triode Q3 is connected with the base stage of the 4th triode Q4, and is connected to the source electrode of switching tube Q5 by resistance R1; The drain electrode of described switching tube Q5 connects the backward end of described secondary coil winding L 2, and the source electrode of described switching tube Q5 is connected to one end of power source loads R10, and the other end of described power source loads R10 is connected to the forward end of described secondary coil winding L 2.Described second chip U2 comprises the first triode Q1 and the second triode Q2, the emitter of described second triode Q2 connects the source electrode of described switching tube Q5, collector electrode connects the base stage of described 3rd triode Q3, and the forward end of described secondary coil winding L 2 is connected to by resistance R2, base stage connects the base stage of described first triode Q1.The emitter of described first triode Q1 is connected to the forward end of described secondary coil winding L 2 by resistance R3, connect its base stage, and the collector electrode of described first triode Q1 is by being connected to the drain electrode of described switching tube Q5 after the resistance R4 of series connection and diode D1 simultaneously.
In the present embodiment, realize opening of switch tube Q5 by the first control chip U1, control chip U2 and peripheral element R1, R2, R3, R4 and diode D1 and close, thus control synchronization rectification.When electric current inflow transformer L1 Motor Winding Same Name of Ends, L2 Motor Winding Same Name of Ends outflow of bus current, switching tube Q5 is open-minded; When outflow of bus current transformer L1 Motor Winding Same Name of Ends, L2 Motor Winding Same Name of Ends electric current flows into, and switching tube Q5 closes.
Concrete, when electric current inflow transformer L1 Motor Winding Same Name of Ends, L2 Motor Winding Same Name of Ends outflow of bus current, (when namely the inside winding L 2 of transformer is positive), at this moment the sense of current is towards the direction of arrow in Fig. 22, and Q5 is open-minded for switch MOS (synchronous rectification) pipe, and flows through the forward of the control loop sense of current towards diode D1 of resistance R4, can loop be formed, belong to and normally working.
When outflow of bus current transformer L1 Motor Winding Same Name of Ends, L2 Motor Winding Same Name of Ends electric current flows into (when namely the inside winding L 2 of transformer is anti-phase), when the sense of current is towards the direction of arrow in Fig. 21, and the control loop reverse current flowing through resistance R4 can be blocked by diode D1, this reverse current as shown in phantom in FIG., is unwanted when circuit normally works.Therefore, block this reverse current and can improve the rising of control second chip U2 temperature, thus improve the reliability of circuit.
Preferably, in the present embodiment, described first triode Q1, the second triode Q2 and the 3rd triode Q3 are NPN triode, and described 4th triode Q4 is PNP triode.
Preferably, in the present embodiment, described synchronous arrangement output circuit 11 can be half-bridge or LLC topology synchronously arranges output circuit, and its concrete structure is familiar with by the art personnel, is not described in detail at this.
Preferably, in the present embodiment, also filter circuit can be connected between described control circuit 21 and power source loads R10.
Understandable, the switching power converters circuit of synchronous rectification of the present embodiment is single channel circuit of synchronous rectification, and transformer T only has a secondary coil winding (L2), namely only realizes synchronous rectification by a control circuit.
Embodiment 2
Please refer to Fig. 3, is the circuit diagram of the second embodiment of switching power converters circuit of synchronous rectification of the present invention.The same with the switching power converters circuit of synchronous rectification of the first embodiment, the synchronous arrangement output circuit 11 that transformer T1 connects with the primary coil winding L 1 of described transformer T1, the control circuit 21 between the secondary coil winding L 2 being connected to described transformer T1 and power source loads R10.Described control circuit 21 comprises switching tube Q5 (MOSFET), the first chip U1 (MMDT4413) and the second chip U2 (MMDT4401), wherein, described U1 and U2 is integrated circuit, and it is equivalent to the discrete component composition in square frame.
Wherein, the circuit structure of described control circuit 21 is identical with the control circuit 21 of the first embodiment with operation principle (with reference to figure 2), is not described in detail in this.
With the first embodiment unlike, the switching power converters circuit of synchronous rectification of the present embodiment is that single-ended reverse exciting synchronously arranges output circuit.
Embodiment 3
Please refer to Fig. 4, is the circuit diagram of the 3rd embodiment of switching power converters circuit of synchronous rectification of the present invention.The same with the switching power converters circuit of synchronous rectification of the first embodiment, described switching power converters circuit of synchronous rectification comprises synchronous arrangement output circuit 11 that transformer T1 connects with the primary coil winding L 1 of described transformer T1, first control circuit 21 between the secondary coil winding L 2 being connected to described transformer T1 and power source loads R10.
With the first embodiment unlike, described switching power converters circuit of synchronous rectification also comprise transformer T secondary coil winding L 3, be connected to second control circuit 22 between described secondary coil winding L 3 and power source loads R10.Wherein, the inductive current direction phase place of secondary coil winding L 2 and L3 is contrary.And connect an isolation capacitance C1 between described first control circuit 21 and second control circuit 22 with isolation.
Wherein, the circuit structure of described first control circuit 21 is identical with the control circuit 21 of the first embodiment with operation principle (with reference to figure 2), is not described in detail in this.
And the circuit structure of described second control circuit 22 is identical with first control circuit 21, specifically comprise: switching tube Q6 (MOSFET), the 3rd chip U3 (MMDT4413) and the 4th chip U4 (MMDT4401), wherein, described U3 and U4 is integrated circuit, and it is equivalent to the discrete component composition in square frame.
Concrete, described 3rd chip U3 comprises the 7th triode Q7 and the 8th triode Q8, the emitter of described 7th triode Q7 is connected with the emitter of described 8th diode Q8, and be connected to the grid of described switching tube Q6 simultaneously, the collector electrode of described 7th triode Q7 connects the forward end of described secondary coil winding L 3, the collector electrode of described 8th triode Q8 connects the source electrode of described switching tube Q6, described 7th triode Q7 is connected with the base stage of the 8th triode Q8, and is connected to the source electrode of switching tube Q5 by resistance R5; The drain electrode of described switching tube Q5 connects the backward end of described secondary coil winding L 3, and the source electrode of described switching tube Q6 is connected to one end of power source loads R10, and the other end of described power source loads R10 is connected to the forward end of described secondary coil winding L 3.Described 4th chip U4 comprises the 5th triode Q5 and the 6th triode Q6, the emitter of described 6th triode Q6 connects the source electrode of described switching tube Q6, collector electrode connects the base stage of described 7th triode Q7, and the forward end of described secondary coil winding L 3 is connected to by resistance R6, base stage connects the base stage of described 5th triode Q5.The emitter of described 5th triode Q5 is connected to the forward end of described secondary coil winding L 3 by resistance R7, connect its base stage, and the collector electrode of described 5th triode Q5 is by being connected to the drain electrode of described switching tube Q6 after the resistance R8 of series connection and diode D2 simultaneously.
In the present embodiment, realize opening and closing of switch tube Q5 and Q6 by the first control chip U1, the second control chip U2, the 3rd control chip U3, the 4th control chip U4 and peripheral element etc., thus control synchronization rectification.When the L1 Motor Winding Same Name of Ends of electric current inflow transformer T, L2 Motor Winding Same Name of Ends outflow of bus current, switching tube Q5 is open-minded; L3 Motor Winding Same Name of Ends outflow of bus current simultaneously, switching tube Q6 closes.When the L1 Motor Winding Same Name of Ends of outflow of bus current transformer T, L2 Motor Winding Same Name of Ends electric current flows into, and switching tube Q5 closes, and at this moment L3 Motor Winding Same Name of Ends electric current flows into, and switching tube Q6 is open-minded.
Concrete, when electric current inflow transformer L1 Motor Winding Same Name of Ends, L2 Motor Winding Same Name of Ends outflow of bus current, (when namely the inside winding L 2 of transformer is positive), at this moment the sense of current is towards the direction of arrow in Fig. 42, and Q5 is open-minded for switch MOS (synchronous rectification) pipe, and flows through the forward of the control loop sense of current towards diode D1 of resistance R4, can loop be formed, belong to and normally working.
When outflow of bus current transformer L1 Motor Winding Same Name of Ends, L2 Motor Winding Same Name of Ends electric current flows into (when namely the inside winding L 2 of transformer is anti-phase), when the sense of current is towards the direction of arrow in Fig. 21, and the control loop reverse current flowing through resistance R4 can be blocked by diode D1, this reverse current as shown in phantom in FIG., is unwanted when circuit normally works.Therefore, block this reverse current and can improve the rising of control second chip U2 temperature, thus improve the reliability of circuit.
In like manner, when outflow of bus current transformer L1 Motor Winding Same Name of Ends, L3 Motor Winding Same Name of Ends electric current flows into, at this moment the sense of current is towards the direction of arrow in Fig. 44, Q6 is open-minded for switch MOS (synchronous rectification) pipe, and flow through the forward of the control loop sense of current towards diode D2 of resistance R8, can loop be formed, belong to and normally working.
When electric current inflow transformer L1 Motor Winding Same Name of Ends, L3 Motor Winding Same Name of Ends outflow of bus current, when the sense of current is towards the direction of arrow in Fig. 43, and the control loop reverse current flowing through resistance R8 can be blocked by diode D2, this reverse current direction is not shown in the figures, is unwanted when circuit normally works.Therefore, block this reverse current and can improve the rising of control the 4th chip U4 temperature, thus improve the reliability of circuit.
Preferably, in the present embodiment, described first triode Q1, the second triode Q2 and the 3rd triode Q3 are NPN triode, and described 4th triode Q4 is PNP triode.Described 5th triode Q5, the 6th triode Q6 and the 7th triode Q7 are NPN triode, and described 8th triode Q8 is PNP triode.
Preferably, in the present embodiment, described synchronous arrangement output circuit 11 can be half-bridge or LLC topology synchronously arranges output circuit, and its concrete structure is familiar with by the art personnel, is not described in detail at this.
Preferably, in the present embodiment, also filter circuit can be connected between described first control circuit 21 and power source loads R10.
Understandable, the switching power converters circuit of synchronous rectification of the present embodiment is two-way circuit of synchronous rectification, and transformer T has two secondary coil windings (L2 and L3), namely only realizes synchronous rectification by two control circuits.
Understandable, the switching power converters circuit of synchronous rectification of the present embodiment also can be Multi-path synchronous rectification circuit, and Multi-path synchronous rectification is the repeated application of single channel synchronous rectification.
More than in conjunction with most preferred embodiment, invention has been described, but the present invention is not limited to the embodiment of above announcement, and should contain various carry out according to essence of the present invention amendment, equivalent combinations.
Claims (6)
1. a switching power converters circuit of synchronous rectification, comprises the synchronous arrangement output circuit of transformer and the primary coil winding switching of described transformer, is connected to control circuit between the secondary coil winding of described transformer and power source loads; Described control circuit is is at least connected and composed by switching tube, the first chip and the second chip, is connected to the forward end of described secondary coil winding after described first chip is connected with the second chip, and between the input being connected to described switching tube and control end; The output of described switching tube connects the backward end of described secondary coil winding; It is characterized in that, the branch road that described second chip is connected with the output of described switching tube is provided with one-way conduction original paper, thus the described branch road that reverses current through blocking described secondary coil winding induction generation flows into described second chip;
Described one-way conduction original paper is diode;
Described first chip comprises the 3rd triode Q3 and the 4th triode Q4, the emitter of described 3rd triode Q3 is connected with the emitter of described 4th triode Q4, and be connected to the grid of described switching tube, the collector electrode of described 3rd triode Q3 connects the forward end of described secondary coil winding, the collector electrode of described 4th triode Q4 connects the source electrode of described switching tube, described 3rd triode Q3 is connected with the base stage of the 4th triode Q4, and is connected to the source electrode of switching tube by resistance R1; The drain electrode of described switching tube connects the backward end of described secondary coil winding; Described second chip comprises the first triode Q1 and the second triode Q2, the emitter of described second triode Q2 connects the source electrode of described switching tube, collector electrode connects the base stage of described 3rd triode Q3, and the forward end of described secondary coil winding is connected to by resistance R2, base stage connects the base stage of described first triode Q1; The forward end that the emitter of described first triode Q1 is connected to described secondary coil winding by resistance R3, connect its base stage, the collector electrode of described first triode Q1 is connected to the drain electrode of described switching tube by resistance R4 and described diode D1 simultaneously.
2. switching power converters circuit of synchronous rectification as claimed in claim 1, it is characterized in that: described switching tube is MOSFET pipe, described first triode Q1, the second triode Q2 and the 3rd triode Q3 are NPN triode, and described 4th triode Q4 is PNP triode.
3. switching power converters circuit of synchronous rectification as claimed in claim 1, it is characterized in that: described secondary coil winding comprises multiple winding, each winding switching correspondence connects a described control circuit, and connects an isolation capacitance between each control circuit.
4. switching power converters circuit of synchronous rectification as claimed in claim 3, it is characterized in that: described secondary coil winding comprises two windings, and the inductive current direction phase place of two windings is contrary.
5. switching power converters circuit of synchronous rectification as claimed in claim 1, is characterized in that: described synchronous arrangement output circuit can be single-ended reverse exciting, half-bridge or LLC topology and synchronously arranges output circuit.
6. switching power converters circuit of synchronous rectification as claimed in claim 1, is characterized in that: also connect filter circuit between described control circuit and power source loads.
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| CN201310188649.6A CN103280959B (en) | 2013-05-20 | 2013-05-20 | Synchronous rectification circuit of switching power supply converter |
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| CN201310188649.6A CN103280959B (en) | 2013-05-20 | 2013-05-20 | Synchronous rectification circuit of switching power supply converter |
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| KR0144540B1 (en) * | 1994-08-25 | 1998-10-01 | 김광호 | Surge protection circuit of smps |
| TWI220084B (en) * | 2003-06-09 | 2004-08-01 | Acbel Polytech Inc | Synchronous rectifying power converter controlled by current transformer |
| KR100568319B1 (en) * | 2004-10-22 | 2006-04-05 | 삼성전기주식회사 | Flyback converter with synchronous rectifier |
| CN2753053Y (en) * | 2004-12-03 | 2006-01-18 | 深圳市核达中远通电源技术有限公司 | Isolation driving circuit used for synchronous rectification |
| WO2010056989A1 (en) * | 2008-11-14 | 2010-05-20 | Flextronics International Usa, Inc. | Driver for a synchronous rectifier and power converter employing the same |
| CN201352771Y (en) * | 2008-11-26 | 2009-11-25 | 天宝电子（惠州）有限公司 | Synchronous rectifier circuit |
| CN201466997U (en) * | 2009-07-20 | 2010-05-12 | 英飞特电子（杭州）有限公司 | Current control synchronous rectification drive circuits |
| CN101895207A (en) * | 2010-06-28 | 2010-11-24 | 华为技术有限公司 | Control circuit and method and power supply device |
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