CN202550891U - Synchronous power rectifying circuit - Google Patents

Synchronous power rectifying circuit Download PDF

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Publication number
CN202550891U
CN202550891U CN2012201720985U CN201220172098U CN202550891U CN 202550891 U CN202550891 U CN 202550891U CN 2012201720985 U CN2012201720985 U CN 2012201720985U CN 201220172098 U CN201220172098 U CN 201220172098U CN 202550891 U CN202550891 U CN 202550891U
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CN
China
Prior art keywords
circuit
synchronous rectification
power supply
diode
rectification
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Expired - Fee Related
Application number
CN2012201720985U
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Chinese (zh)
Inventor
李胜龙
王琰
程国胜
蒙程飞
陈恒留
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD.
Original Assignee
SHENZHEN JINGFUYUAN TECH Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN2012201720985U priority Critical patent/CN202550891U/en
Priority to PCT/CN2012/080730 priority patent/WO2013155816A1/en
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Publication of CN202550891U publication Critical patent/CN202550891U/en
Anticipated expiration legal-status Critical
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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
    • H02M3/33592—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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • 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

Abstract

The utility model discloses a synchronous power rectifying circuit, which comprises a power output circuit, a synchronous rectifying driving circuit connected with the power output circuit, and a synchronous rectifying control circuit arranged on an output line of the power output circuit, wherein the synchronous rectifying control circuit comprises a switching tube Q2, a dummy load R1, a capacitor C3 and a resistor R3; a first pole of the switching tube Q2 is respectively connected to a positive output end and a negative output end through the capacitor C3 and the resistor R3; a second pole of the switching tube Q2 is connected to the teh positive output end through the dummy load R1; and a third pole of the switching tube Q2 is connected to the negative output end. The synchronous power rectifying circuit is simple, excellent in performance, high in reliability, and power-saving and energy-saving, and used components are small in number, small in size and low in cost.

Description

The power supply circuit of synchronous rectification
Technical field
The utility model relates to field of power supplies, relates in particular to a kind of power supply circuit of synchronous rectification.
Background technology
In contemporary society; Along with continuous progress in science and technology; Requirement to power supply is also increasingly high, and power supply has been the inexorable trend of social development to high power density, high conversion efficiency, volume microminiaturization and modularization, adopts synchronous rectification mostly and be satisfied with above-mentioned condition person simultaneously.Synchronous rectification at present substitutes the conventional diode rectification have been become a kind of inevitablely, and from working method, synchronous rectification is divided into two kinds of independent-excited synchronous rectification and auto-excitation type synchronous rectifications again.Independent-excited synchronous rectification is adopted in traditional synchronous rectification mostly, and Fig. 1 is the circuit diagram of the independent-excited synchronous commutating control circuit of prior art.As shown in Figure 1, it adopts external driven in synchronism control chip U1 to carry out synchronous rectification control.Wherein T1A, T1B, Q2 are the prime power circuit, carry out voltage transformation, power delivery and electrical isolation.U1 is a synchronous rectification control master chip; Wherein to have formed linear voltage-stabilizing circuit be that control chip provides galvanic current to press for Q4, ZD1, R7, C6, C4; Q3, Q5 strengthen the driving force to synchronous rectification metal-oxide-semiconductor Q1 for the totem drive circuit, and R5 is that synchronous rectification detects inductive reactance, and synchronizing signal is input to U1 inside through this resistance with synchronous rectification signal; Thereby judge that through the inner testing circuit of U1 the output synchronizing signal drives Q1; And R1, R3 to be output voltage detect that resistance proportionally amplifies output voltage is input to U1 inside, R4 is that output current detects resistance, output current flows through R4 and on R4, produces pressure drop; This voltage joins U1 inside; Output voltage signal and output current signal, are controlled elementary pwm control circuit through control photoelectric isolating coupler O T1 and are adjusted the purpose that duty ratio reaches control output voltage from control signal of 5 pin output through the U1 internal arithmetic, and R6 is that biasing resistor is that OT1 provides Control current.
Though the generation of common phenomenon can both be controlled precisely and can be avoided to this independent-excited synchronous commutating control circuit in gamut, because circuit structure is complicated, component number is numerous, causes its reliability reduction and cost high.
To the shortcoming of conventional art, other a solution has been proposed in the prior art, i.e. auto-excitation type synchronous rectification, Fig. 2 is the auto-excitation type circuit of synchronous rectification schematic diagram of prior art.As shown in Figure 2; Transformer Winding T1A belongs to main power circuit, and Q1 is the synchronous rectification metal-oxide-semiconductor, and Transformer Winding T1B belongs to synchronous rectification driving winding provides switching drive signal to Q1; Because circuit working elementary control circuit drive signal duty ratio under no-load condition is less; The drive signal duty ratio that causes transformer T1B induction to be come is less can not effectively to drive the complete conducting of synchronous rectification metal-oxide-semiconductor Q1, thus on the output main circuit, increase dummy load R1, R7, R8, to strengthen the duty ratio of primary control signal; Thereby increase driving force, make circuit under idle condition, also can get into the synchronous rectification pattern Q1.
Though this auto-excitation type circuit of synchronous rectification component number reduces a lot; Cost has correspondingly reduced a lot; But because its output increased the dummy load circuit, thereby aspect the reliability of power supply, have following two kinds of defectives significantly: too much the output power consumption increases when then existing the power supply operate as normal, whole efficiency is on the low side can not meet the requirement of present efficient power if dummy load adds; If dummy load adds to such an extent that the too small power supply that then exists has had into not the synchronous rectification state with down to No Load Start the time during circuit in a certain underloading; The loss of power rectifier pipe increases; The lighter can cause the phenomenon of the unloaded vibration of power supply, underloading duty-cycle loss; Weight person directly burns rectifying tube; Have a strong impact on power supply reliability of operation, machine life and use the equipment of this power supply, the useful life of Device and Meters, thereby can't guarantee that the control circuit that Switching Power Supply, linear stabilized power supply and other power work mode are synchronous rectification can both operate as normal.
Summary of the invention
The utility model technical problem to be solved is: a kind of power supply synchronization control circuit is provided, and this circuit is simple, function admirable, high, the power and energy saving of reliability, and used components and parts are considerably less, volume is little, cost is very low.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:.
A kind of power supply circuit of synchronous rectification; Synchronous commutating control circuit on the outlet line that includes power output circuit, the synchronous rectification driving circuit that links to each other with this power output circuit and be arranged on said power output circuit; Said synchronous commutating control circuit has included switching tube Q2, dummy load R1, capacitor C 3 and resistance R 3, and first utmost point of said this switching tube Q2 is connected to the cathode output end and the cathode output end of power supply respectively through said capacitor C 3 and resistance R 3; Second utmost point is connected to said cathode output end through said dummy load R1; The 3rd utmost point is connected to said cathode output end.
As a mentality of designing of the utility model, said synchronous rectification driving circuit is the inverse-excitation type drive circuit.
Preferably:
Said power output circuit includes main power output winding T1A, is arranged on capacitor C 1, the C2 of two parallel connections on its outlet line; And being arranged on the rectifying tube Q1 on the negative pole outlet line, the cathode output end that cathode output end, the negative pole that the positive pole of said capacitor C 1, C2 is connected to said main power output winding T1A is connected to the said main power output winding T1A of the 3rd utmost point of said rectifying tube Q1 then is connected to second utmost point of said rectifying tube Q1;
Said synchronous rectification driving circuit includes the resistance R 2 that rectification drives winding T1B, diode D1 and is connected in parallel on this diode D1 two ends, and first utmost point, the negative pole that the positive pole of said diode D1 is connected to said rectifying tube Q1 is connected to the end of said rectification driving winding T1B, the other end of said rectification driving winding T1B is connected to the outlet line negative pole of said power output circuit.
Perhaps, said synchronous rectification driving circuit is the positive activation type drive circuit.
Preferably:
Said power output circuit includes main power output winding T1A, the capacitor C 1 that is arranged on two parallel connections on its outlet line, C2, is arranged on the rectifying tube Q3 between capacitor C 1, the C2 and is arranged on the rectifying tube Q1 on the negative pole outlet line, and first utmost point of said rectifying tube Q1, Q3 is connected respectively to first synchronous rectification driving circuit and second synchronous rectification driving circuit;
Said first synchronous rectification driving circuit includes the resistance R 2 that rectification drives winding T1B, diode D1 and is connected in parallel on this diode D1 two ends, and first utmost point, the negative pole that the positive pole of said diode D1 is connected to said rectifying tube Q1 is connected to outlet line negative pole that a end that said rectification drives winding T1B, the other end that said rectification drives winding T1B be connected to said power output circuit, between the positive pole of diode D1 and power output circuit negative pole, also is provided with a resistance R 4;
Said second synchronous rectification driving circuit includes the resistance R 6 that rectification drives winding T1C, diode D2 and is connected in parallel on this diode D2 two ends, and first utmost point, the negative pole that the positive pole of said diode D2 is connected to said rectifying tube Q3 is connected to outlet line negative pole that a end that said rectification drives winding T1C, the other end that said rectification drives winding T1C be connected to said power output circuit, between the positive pole of diode D1 and power output circuit negative pole, also is provided with a resistance R 5.
Preferably; Said capacitor C 3 is free of attachment to outlet line; And be connected to the power end of an auxiliary power supply circuit; Said auxiliary power supply circuit comprises the loop that is made up of auxiliary power supply winding T1D, rectifier diode D3 and filter capacitor C4, and the positive pole of said filter capacitor C4 is connected to said power end VCC, and negative pole is connected to said outlet line GND.
Preferably, said switching tube is metal-oxide-semiconductor or triode.
Preferably, first of said metal-oxide-semiconductor very grid, second very drain, the 3rd source electrode very.
The beneficial effect of the utility model is:
The embodiment of the utility model is through utilizing switching tube Q2 control dummy load R1, in the startup moment of power supply, the closed conducting of the switching tube Q2 in the synchronous commutating control circuit, connects dummy load R1, makes power supply get into the synchronous rectification state rapidly; And after the power work output normally; Switching tube Q2 ends, breaks off dummy load R1 rapidly; Synchronous commutating control circuit quits work inoperative, and not loss power supply power just often, this synchronous commutating control circuit are in zero loss state; Thereby reached that circuit is simple, function admirable, energy saving, reliability be high, used components and parts are considerably less, volume is little, the low-down effect of cost.
Below in conjunction with accompanying drawing the utility model is done further to describe in detail.
Description of drawings
Fig. 1 is the circuit theory diagrams of the independent-excited power supply circuit of synchronous rectification of prior art.
Fig. 2 is the circuit theory diagrams of the auto-excitation type power supply circuit of synchronous rectification of prior art.
Fig. 3 is the circuit theory diagrams of power supply circuit of synchronous rectification first embodiment of the utility model.
Fig. 4 is the circuit theory diagrams of power supply circuit of synchronous rectification second embodiment of the utility model.
Fig. 5 is the circuit theory diagrams of power supply circuit of synchronous rectification the 3rd embodiment of the utility model.
Fig. 6 is the circuit theory diagrams of power supply circuit of synchronous rectification the 4th embodiment of the utility model.
Embodiment
Describe first embodiment of the power supply circuit of synchronous rectification that the utility model provide below in detail with reference to figure 3; As shown in Figure 3; Synchronous commutating control circuit on the outlet line that present embodiment mainly includes power output circuit, the synchronous rectification driving circuit that links to each other with this power output circuit and is arranged on said power output circuit; Wherein, Said synchronous commutating control circuit includes switching tube Q2, dummy load R1, capacitor C 3 and resistance R 3, and first utmost point of said this switching tube Q2 is connected to the cathode output end and the cathode output end of power supply respectively through said capacitor C 3 and resistance R 3; Second utmost point is connected to said cathode output end VOUT through said dummy load R1; The 3rd utmost point is connected to said cathode output end GND.
During concrete the realization, said triode Q2 can adopt metal-oxide-semiconductor or triode.When adopting metal-oxide-semiconductor, its first very grid, second very drain, the 3rd source electrode very.
In the startup moment of power supply, the closed conducting of switching tube Q2 in the synchronous commutating control circuit, connect dummy load R1, make power supply get into the synchronous rectification state rapidly; And after the power work output normally, switching tube Q2 ends, breaks off dummy load R1 rapidly, and it is inoperative that synchronous commutating control circuit quits work, and not loss power supply power just often, this synchronous commutating control circuit are in zero loss state, energy saving.
In the present embodiment, what synchronous rectification driving circuit adopted is the inverse-excitation type drive circuit.
In said inverse-excitation type drive circuit; Said power output circuit includes main power drive winding T1A, is arranged on capacitor C 1, the C2 of two parallel connections on its outlet line; And being arranged on the rectifying tube Q1 on the negative pole outlet line, the cathode output end that cathode output end, the negative pole that the positive pole of said capacitor C 1, C2 is connected to said main power output winding T1A is connected to the said main power output winding T1A of the 3rd utmost point of said rectifying tube Q1 then is connected to second utmost point of said rectifying tube Q1
Said synchronous rectification driving circuit includes the resistance R 2 that rectification drives winding T1B, diode D1 and is connected in parallel on this diode D1 two ends, and first utmost point, the negative pole that the positive pole of said diode D1 is connected to said rectifying tube Q1 is connected to the end of said rectification driving winding T1B, the other end of said rectification driving winding T1B is connected to the outlet line negative pole of said power output circuit.
Describe second embodiment of the power supply circuit of synchronous rectification that the utility model provide below in detail with reference to figure 4; As shown in Figure 4, present embodiment and previous embodiment are identical, and its difference only is that what synchronous rectification driving circuit adopted is the positive activation type drive circuit.
In this positive activation type drive circuit; Said power output circuit includes main power output winding T1A, the capacitor C 1 that is arranged on two parallel connections on its outlet line, C2, is arranged on the rectifying tube Q3 between capacitor C 1, the C2 and is arranged on the rectifying tube Q1 on the negative pole outlet line, and first utmost point of said rectifying tube Q1, Q3 is connected respectively to first synchronous rectification driving circuit and second synchronous rectification driving circuit;
Said first synchronous rectification driving circuit includes the resistance R 2 that rectification drives winding T1B, diode D1 and is connected in parallel on this diode D1 two ends, and first utmost point, the negative pole that the positive pole of said diode D1 is connected to said rectifying tube Q1 is connected to outlet line negative pole that a end that said rectification drives winding T1B, the other end that said rectification drives winding T1B be connected to said power output circuit, between the positive pole of diode D1 and power output circuit negative pole, also is provided with a resistance R 4;
Said second synchronous rectification driving circuit includes the resistance R 6 that rectification drives winding T1C, diode D2 and is connected in parallel on this diode D2 two ends, and first utmost point, the negative pole that the positive pole of said diode D2 is connected to said rectifying tube Q3 is connected to outlet line negative pole that a end that said rectification drives winding T1C, the other end that said rectification drives winding T1C be connected to said power output circuit, between the positive pole of diode D1 and power output circuit negative pole, also is provided with a resistance R 5.
Describe the 3rd embodiment of the power supply circuit of synchronous rectification that the utility model provide below in detail with reference to figure 5; As shown in Figure 5; Present embodiment and aforementioned first embodiment are identical, and its difference only is that said capacitor C 3 is free of attachment to outlet line; And be connected to the power end of an auxiliary power supply circuit; Said auxiliary power supply circuit comprises the loop that is made up of auxiliary power supply winding T1D, rectifier diode D3 and filter capacitor C4, and the positive pole of said filter capacitor C4 is connected to said power end VCC, and negative pole is connected to said outlet line GND.
In the present embodiment; Transformer T1D is the auxiliary power supply winding; Give switching tube Q2 power supply through the power end VCC voltage behind D3, the C4 rectifying and wave-filtering through capacitor C 3, this circuit can be applied in and be output as the low-voltage and high-current occasion, is 0.8V/30A, 1.2V/15A etc. such as output voltage; Because output voltage is relatively low; If adopt the circuit of aforementioned each embodiment to be difficult to effective driving switch pipe Q2, therefore, make present embodiment can be applied in above-mentioned low-voltage and high-current occasion through the method for external auxiliary circuit.
Describe the 4th embodiment of the power supply circuit of synchronous rectification that the utility model provide below in detail with reference to figure 6; As shown in Figure 6; Present embodiment and aforementioned the 3rd embodiment are identical, and its difference only is that what synchronous rectification driving circuit adopted is the positive activation type drive circuit; This positive activation type drive circuit is identical with positive activation type drive circuit among aforementioned second embodiment, repeats no more.
The utility model compared with prior art; Both eliminated that independent-excited synchronous commutating control circuit complex structure, component number are numerous, the defective of reliability and cost price aspect, solved the auto-excitation type synchronous commutating control circuit again well because output has increased that the power supply output power consumption that the dummy load circuit brings increases, whole efficiency is on the low side and can not meet the existing phenomenon problem that requires of present efficient power.Its circuit is simple, function admirable, and used components and parts are considerably less, volume is little, cost is low.Main components and parts have only four components and parts such as metal-oxide-semiconductor or the triode of an electric capacity, two resistance and a SOT23 encapsulation; Design very convenient and under the situation of power supply operate as normal; Control circuit quits work inoperative, not loss power supply power just often, thus make economical low-cost reliability synchronous commutating control circuit be in zero loss state; Energy saving is through improving the range of application that can also enlarge circuit.Be applicable to the field of power supplies of equipment, Device and Meters, the control circuit that to relate in particular to Switching Power Supply, linear stabilized power supply and other power work mode be synchronous rectification.
The above is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also are regarded as the protection range of the utility model.

Claims (10)

1. power supply circuit of synchronous rectification; Synchronous commutating control circuit on the outlet line that includes power output circuit, the synchronous rectification driving circuit that links to each other with this power output circuit and be arranged on said power output circuit; It is characterized in that: said synchronous commutating control circuit includes switching tube Q2, dummy load R1, capacitor C 3 and resistance R 3, and first utmost point of said this switching tube Q2 is connected to the cathode output end and the cathode output end of power supply respectively through said capacitor C 3 and resistance R 3; Second utmost point is connected to said cathode output end through said dummy load R1; The 3rd utmost point is connected to said cathode output end.
2. power supply circuit of synchronous rectification as claimed in claim 1 is characterized in that: said synchronous rectification driving circuit is the inverse-excitation type drive circuit.
3. power supply circuit of synchronous rectification as claimed in claim 2 is characterized in that:
Said power output circuit includes main power output winding T1A, is arranged on capacitor C 1, the C2 of two parallel connections on its outlet line; And being arranged on the rectifying tube Q1 on the negative pole outlet line, the cathode output end that cathode output end, the negative pole that the positive pole of said capacitor C 1, C2 is connected to said main power output winding T1A is connected to the said main power output winding T1A of the 3rd utmost point of said rectifying tube Q1 then is connected to second utmost point of said rectifying tube Q1;
Said synchronous rectification driving circuit includes the resistance R 2 that rectification drives winding T1B, diode D1 and is connected in parallel on this diode D1 two ends, and first utmost point, the negative pole that the positive pole of said diode D1 is connected to said rectifying tube Q1 is connected to the end of said rectification driving winding T1B, the other end of said rectification driving winding T1B is connected to the outlet line negative pole of said power output circuit.
4. power supply circuit of synchronous rectification as claimed in claim 1 is characterized in that: said synchronous rectification driving circuit is the positive activation type drive circuit.
5. power supply circuit of synchronous rectification as claimed in claim 4 is characterized in that:
Said power output circuit includes main power output winding T1A, the capacitor C 1 that is arranged on two parallel connections on its outlet line, C2, is arranged on the rectifying tube Q3 between capacitor C 1, the C2 and is arranged on the rectifying tube Q1 on the negative pole outlet line, and first utmost point of said rectifying tube Q1, Q3 is connected respectively to first synchronous rectification driving circuit and second synchronous rectification driving circuit;
Said first synchronous rectification driving circuit includes the resistance R 2 that rectification drives winding T1B, diode D1 and is connected in parallel on this diode D1 two ends, and first utmost point, the negative pole that the positive pole of said diode D1 is connected to said rectifying tube Q1 is connected to outlet line negative pole that a end that said rectification drives winding T1B, the other end that said rectification drives winding T1B be connected to said power output circuit, between the positive pole of diode D1 and power output circuit negative pole, also is provided with a resistance R 4;
Said second synchronous rectification driving circuit includes the resistance R 6 that rectification drives winding T1C, diode D2 and is connected in parallel on this diode D2 two ends, and first utmost point, the negative pole that the positive pole of said diode D2 is connected to said rectifying tube Q3 is connected to outlet line negative pole that a end that said rectification drives winding T1C, the other end that said rectification drives winding T1C be connected to said power output circuit, between the positive pole of diode D1 and power output circuit negative pole, also is provided with a resistance R 5.
6. like each described power supply circuit of synchronous rectification among the claim 1-5; It is characterized in that: said capacitor C 3 is free of attachment to outlet line; And be connected to the power end of an auxiliary power supply circuit; Said auxiliary power supply circuit comprises the loop that is made up of auxiliary power supply winding T1D, rectifier diode D3 and filter capacitor C4, and the positive pole of said filter capacitor C4 is connected to said power end VCC, and negative pole is connected to said outlet line GND.
7. power supply circuit of synchronous rectification as claimed in claim 6 is characterized in that: said switching tube and rectifying tube are metal-oxide-semiconductor or triode.
8. power supply circuit of synchronous rectification as claimed in claim 7 is characterized in that: said metal-oxide-semiconductor first very grid, second very drain, the 3rd source electrode very.
9. like each described power supply circuit of synchronous rectification among the claim 1-5, it is characterized in that: said switching tube is metal-oxide-semiconductor or triode.
10. power supply circuit of synchronous rectification as claimed in claim 9 is characterized in that: said metal-oxide-semiconductor first very grid, second very drain, the 3rd source electrode very.
CN2012201720985U 2012-04-20 2012-04-20 Synchronous power rectifying circuit Expired - Fee Related CN202550891U (en)

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CN2012201720985U CN202550891U (en) 2012-04-20 2012-04-20 Synchronous power rectifying circuit
PCT/CN2012/080730 WO2013155816A1 (en) 2012-04-20 2012-08-29 Synchronous power rectifying circuit

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Application Number Priority Date Filing Date Title
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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW548892B (en) * 2000-11-30 2003-08-21 Delta Electronics Inc Synchronous rectification circuit
JP2005151796A (en) * 2003-09-30 2005-06-09 Sony Corp Switching power supply circuit
CN101030733B (en) * 2007-03-21 2011-04-13 中国科学院电工研究所 Multi-level power converter of light unit cascade
US7764516B2 (en) * 2008-02-21 2010-07-27 System General Corporation Method and apparatus of providing synchronous regulation circuit for offline power converter
CN201349180Y (en) * 2009-01-20 2009-11-18 深圳市振华微电子有限公司 Synchronous rectifier driving circuit

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