CN107896068A - A kind of synchronous rectification driving circuit - Google Patents
A kind of synchronous rectification driving circuit Download PDFInfo
- Publication number
- CN107896068A CN107896068A CN201711289033.2A CN201711289033A CN107896068A CN 107896068 A CN107896068 A CN 107896068A CN 201711289033 A CN201711289033 A CN 201711289033A CN 107896068 A CN107896068 A CN 107896068A
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- Prior art keywords
- diode
- triode
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- winding
- electric capacity
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Classifications
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of synchronous rectification driving circuit, is related to electronic technology field, and T3 of the invention and T4 is respectively two windings on transformer, wherein, T3 is secondary side winding, and for the transmission of energy, T4 is assists winding.The voltage rise of voltage follow T3 on T4, to open two windings that synchronous rectification Mos pipes M1, CT1 and CT2 are then Current Transmit, wherein, armature winding CT1 is gone here and there in main circuit, and the electric current of Mos pipes is flowed through for detecting, when the electric current in CT1 drops to zero, CT2 will turn off M1, and therefore, synchronous rectification driving circuit of the invention is turned on voltage signal control Mos pipes, current signal control Mos pipe shut-offs, not only efficiency high, and working stability, in the absence of opening by mistake logical situation.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of synchronous rectification driving circuit.
Background technology
In in general inverse-excitation type switch power-supply, the loss of the commutation diode of secondary side be power-efficient material impact because
One of element, this problem can be alleviated by the Schottky diode from low conduction voltage drop.But on the one hand, this improvement pair
The influence of performance is not very significant；On the other hand, if the voltage of output is higher, and Schottky diode is reverse pressure-resistant
It is general relatively low, it is difficult to meet to require.
The content of the invention
It is an object of the invention to：To solve to select the Schottky two of low conduction voltage drop in existing inverse-excitation type switch power-supply
Pole pipe is come to alleviate the effect of commutation diode loss be not fine, and if the voltage of output is higher, and Schottky diode
It is reverse pressure-resistant general relatively low, it is difficult to the problem of satisfaction requires, the present invention provide a kind of synchronous rectification driving circuit.
Technical scheme is as follows：
A kind of synchronous rectification driving circuit, the circuit connecting mode are：Two windings of transformer one end include secondary
Side winding T3 and assists winding T4, secondary side winding T3 one end connect respectively diode D1 negative electrode and polar capacitor C3 just
Pole, the armature winding CT1 of secondary side winding T3 other end connection current transformer one end, the armature winding CT1 other end
Metal-oxide-semiconductor M1 drain electrode is connected, polar capacitor C3 negative pole connects metal-oxide-semiconductor M1 source electrode, and diode D2 anode connection electric current is mutual
The secondary windings CT2 of sensor one end, CT2 this one end connection resistance R2 one end, resistance R2 other end ground connection, it is secondary around
Electric capacity C2 and diode the D4 ground connection of group CT2 other end connection parallel connection, diode D4DE plus earths；The one of assists winding T4
End connection resistance R1 and diode D2 in parallel, diode D2 cathode connected to the transistor Q2 emitter stage, the R1 other end connect
Connect triode Q2 base stage, the one end of triode Q2 emitter stage also with electric capacity C1 is connected, triode Q2 colelctor electrode connection electricity
Hold the C1 other end, diode D6 negative electrode and triode Q1 emitter stage, metal-oxide-semiconductor M1 grid connection diode D6 negative electrode
With triode Q1 emitter stage, triode Q1 base stage connection diode D5 anode, diode D5 negative electrode connection resistance R2
Earth-free one end, triode Q1 grounded collector, assists winding T4 other end ground connection, diode D2 negative electrode are also connected with
There are diode D3 one end, diode D3 other end ground connection.
Specifically, the colelctor electrode of the triode Q2, metal-oxide-semiconductor M1 grid connect electric capacity C4 with triode Q1 emitter stage
One end, electric capacity C4 the other end ground connection.
After such scheme, beneficial effects of the present invention are：
T3 and T4 is respectively two windings on transformer, wherein, T3 is secondary side winding, for the transmission of energy, T4
For assists winding.The voltage rise of voltage follow T3 on T4, it is then electricity to open synchronous rectification Mos pipes M1, CT1 and CT2
Current transformer CT two windings, wherein, armature winding CT1 is gone here and there in main circuit, and the electric current of Mos pipes is flowed through for detecting,
When the electric current in CT1 drops to zero, CT2 will turn off M1, and therefore, synchronous rectification driving circuit of the invention is with voltage signal
Control the conducting of Mos pipes, current signal control Mos pipe shut-offs, not only efficiency high, and working stability, in the absence of opening by mistake logical feelings
Condition.
Brief description of the drawings
Fig. 1 is the circuit diagram of the present invention；
Fig. 2 is that the no-voltage in embodiments of the invention opens circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the present embodiment is carried out clearly and completely
Description, it is clear that described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, belongs to the scope of protection of the invention.
A kind of synchronous rectification driving circuit in the present embodiment, circuit connecting mode are：Two windings of transformer one end
Including secondary side winding T3 and assists winding T4, secondary side winding T3 one end connects diode D1 negative electrode and polarity electricity respectively
Hold C3 positive pole, the armature winding CT1 of secondary side winding T3 other end connection current transformer one end, armature winding CT1
Other end connection metal-oxide-semiconductor M1 drain electrode, polar capacitor C3 negative pole connection metal-oxide-semiconductor M1 source electrode, diode D2 anode connects
Connect the secondary windings CT2 of current transformer one end, CT2 this one end connection resistance R2 one end, resistance R2 another termination
Ground, electric capacity C2 and diode the D4 ground connection of secondary windings CT2 other end connection parallel connection, diode D4DE plus earths；Auxiliary
The resistance R1 and diode D2 of winding T4 one end connection parallel connection, diode D2 cathode connected to the transistor Q2 emitter stage, R1
Other end connecting triode Q2 base stage, the one end of triode Q2 emitter stage also with electric capacity C1 is connected, triode Q2 collection
The electrode connection electric capacity C1 other end, diode D6 negative electrode and triode Q1 emitter stage, metal-oxide-semiconductor M1 grid connect two poles
Pipe D6 negative electrode and triode Q1 emitter stage, triode Q1 base stage connection diode D5 anode, diode D5 negative electrode
The earth-free one end of resistance R2, triode Q1 grounded collector are connected, the assists winding T4 other end is grounded, diode D2's
Negative electrode is also associated with diode D3 one end, diode D3 other end ground connection.The colelctor electrode of the triode Q2, metal-oxide-semiconductor M1
Grid electric capacity C4 one end, electric capacity C4 other end ground connection are connected with triode Q1 emitter stage.
Specifically, during use, circuit of the invention is to open circuit with no-voltage by transformer to be connected,
Specific no-voltage opens circuit as shown in Fig. 2 the course of work of the invention that no-voltage opens circuit is：First stage, become
Depressor primary side Mos pipes turn off, and electric current is from the primary side change of current of transformer to secondary side.For T3 windings by CT1, M1 is output electricity
Container C3 charges.The output voltage of T3 windings is clamped in C3 both end voltages (being about 52V in this application).
Due to the assists winding that T4 windings are transformer, therefore, the voltage ratio of Same Name of Ends B points rises to a height
Voltage.Then B point voltages are charged by diode D2 for capacitor C1, C4.Wherein, the gate pole that capacitor C4 is Mos pipes M1 inputs
Electric capacity, typically smaller than 1nF, it is shown in broken lines.Capacitor C1 is additional electric capacity, takes more than 10 times of C4 capacitances.Because C4 is remote
Less than C1, and capacitance very little, according to the series connection voltage divider principle of capacitor, C point voltages are charged to nearly 10V, M1 conductings quickly.
Meanwhile the energy in Current Transmit from winding CT2 by diode D1 feed-in output capacitor C3, reduce switch drive
Loss, D point voltages are also clamped at about 52V.
Second stage, the electric current for flowing through D1 are reduced to 0, and the electric current for now flowing through CT1 is reduced to Ioff.D1 is turned off, and D point voltages are opened
Begin to reduce, finally turn on triode Q1, the electricity on C4 is let go, and C points are changed into low-voltage, M1 shut-offs, and synchronous rectification terminates.By
In now Ioff>0, the charging process of Circuit Fault on Secondary Transformer is not over yet, diverted via M1 parasitic body diode afterflow, A points, B points
Still it is high voltage.Because C4 is short-circuit by Q1, T4 is that C1 charges by D2, Q1, until C1 is filled.It is worth noting that, C1 it
So from electric capacity and without using resistance, the quick charge to C4 in the first stage is on the one hand ensure that, on the other hand causes the
Loss in two-stage after Q1 conductings thereon is minimized, and improves the efficiency of driving.
Phase III, transformer primary side Mos pipes are turned on again, and A points, B points are negative voltage, and PNP triode Q2 is turned on, C1
It is discharged, ensure that next cycle being capable of normal work again.C point voltages are maintained at low-voltage, and opening by mistake for M1 will not be caused logical.
It is worth noting that, in each cycle, C1 can be by impulse electricity repeatedly.Its loss can be obtained by formula P=1/2CU2f.Wherein,
If C=10nF, U=10V, f=100kHz.Therefore P=50mW, this power being lost on C1.As transformer primary side Mos
After pipe turns off again over time, new a cycle starts.
From circuit above work concrete operating principle during it will be seen that the invention has the advantages that：1)
Various output voltages can be widely used in.2) circuit structure and principle are relatively simple.3) drive loss is small, efficiency high.4) it is electric
Road certainty is good, error-free motion.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the involved claim of limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (2)
1. a kind of synchronous rectification driving circuit, it is characterised in that the circuit connecting mode is：Two windings of transformer one end
Including secondary side winding T3 and assists winding T4, secondary side winding T3 one end connects diode D1 negative electrode and polarity electricity respectively
Hold C3 positive pole, the armature winding CT1 of secondary side winding T3 other end connection current transformer one end, armature winding CT1
Other end connection metal-oxide-semiconductor M1 drain electrode, polar capacitor C3 negative pole connection metal-oxide-semiconductor M1 source electrode, diode D2 anode connects
Connect the secondary windings CT2 of current transformer one end, CT2 this one end connection resistance R2 one end, resistance R2 another termination
Ground, electric capacity C2 and diode the D4 ground connection of secondary windings CT2 other end connection parallel connection, diode D4DE plus earths；Auxiliary
The resistance R1 and diode D2 of winding T4 one end connection parallel connection, diode D2 cathode connected to the transistor Q2 emitter stage, R1
Other end connecting triode Q2 base stage, the one end of triode Q2 emitter stage also with electric capacity C1 is connected, triode Q2 collection
The electrode connection electric capacity C1 other end, diode D6 negative electrode and triode Q1 emitter stage, metal-oxide-semiconductor M1 grid connect two poles
Pipe D6 negative electrode and triode Q1 emitter stage, triode Q1 base stage connection diode D5 anode, diode D5 negative electrode
The earth-free one end of resistance R2, triode Q1 grounded collector are connected, the assists winding T4 other end is grounded, diode D2's
Negative electrode is also associated with diode D3 one end, diode D3 other end ground connection.
A kind of 2. synchronous rectification driving circuit according to claim 1, it is characterised in that the current collection of the triode Q2
Pole, metal-oxide-semiconductor M1 grid connect electric capacity C4 one end, electric capacity C4 other end ground connection with triode Q1 emitter stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711289033.2A CN107896068A (en) | 2017-12-07 | 2017-12-07 | A kind of synchronous rectification driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711289033.2A CN107896068A (en) | 2017-12-07 | 2017-12-07 | A kind of synchronous rectification driving circuit |
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| Publication Number | Publication Date |
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| CN107896068A true CN107896068A (en) | 2018-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711289033.2A Pending CN107896068A (en) | 2017-12-07 | 2017-12-07 | A kind of synchronous rectification driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917301A (en) * | 2020-06-17 | 2020-11-10 | 广州金升阳科技有限公司 | Positive and negative excitation auxiliary circuit and switching power supply circuit comprising same |
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| CN104767407A (en) * | 2015-04-20 | 2015-07-08 | 成都岷创科技有限公司 | Synchronous rectification circuit |
| CN204681262U (en) * | 2015-04-20 | 2015-09-30 | 成都岷创科技有限公司 | Inverse-excitation type switch power-supply circuit of synchronous rectification |
| CN105577000A (en) * | 2014-10-14 | 2016-05-11 | 张从辉 | MOS-tube-based self-driven synchronous rectification drive circuit |
| CN105577001A (en) * | 2014-10-15 | 2016-05-11 | 黄生林 | Hybrid synchronous rectification circuit |
| CN105577002A (en) * | 2014-10-15 | 2016-05-11 | 黄生林 | Synchronization rectification circuit of fly-back switching power supply |
| CN207732658U (en) * | 2017-12-07 | 2018-08-14 | 绵阳伟成科技有限公司 | A kind of synchronous rectification driving circuit for Switching Power Supply |
-
2017
- 2017-12-07 CN CN201711289033.2A patent/CN107896068A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105577000A (en) * | 2014-10-14 | 2016-05-11 | 张从辉 | MOS-tube-based self-driven synchronous rectification drive circuit |
| CN105577001A (en) * | 2014-10-15 | 2016-05-11 | 黄生林 | Hybrid synchronous rectification circuit |
| CN105577002A (en) * | 2014-10-15 | 2016-05-11 | 黄生林 | Synchronization rectification circuit of fly-back switching power supply |
| CN104767407A (en) * | 2015-04-20 | 2015-07-08 | 成都岷创科技有限公司 | Synchronous rectification circuit |
| CN204681262U (en) * | 2015-04-20 | 2015-09-30 | 成都岷创科技有限公司 | Inverse-excitation type switch power-supply circuit of synchronous rectification |
| CN207732658U (en) * | 2017-12-07 | 2018-08-14 | 绵阳伟成科技有限公司 | A kind of synchronous rectification driving circuit for Switching Power Supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917301A (en) * | 2020-06-17 | 2020-11-10 | 广州金升阳科技有限公司 | Positive and negative excitation auxiliary circuit and switching power supply circuit comprising same |
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