CN203911791U - Synchronous rectification drive circuit of active clamping forward converter - Google Patents
Synchronous rectification drive circuit of active clamping forward converter Download PDFInfo
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- CN203911791U CN203911791U CN201420231701.1U CN201420231701U CN203911791U CN 203911791 U CN203911791 U CN 203911791U CN 201420231701 U CN201420231701 U CN 201420231701U CN 203911791 U CN203911791 U CN 203911791U
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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
Abstract
The utility model provides a synchronous rectification drive circuit of an active clamping forward converter. The circuit comprises a transformer with a secondary main winding and a secondary auxiliary winding, a first switch tube connected between the dotted terminal of the secondary main winding and ground, a first clamper tube connected between the different name end of the secondary main winding and the first switch tube, a second switch tube connected between the different name end of the secondary main winding and the ground, a second clamper tube connected between the dotted terminal of the secondary auxiliary winding and the second switch tube, and a rectifier tube and a voltage regulator circuit connected in series between the joint point and the dotted terminal of the secondary main winding, the joint point joins the first clamper tube and the second clamper tube, and an output inductor connected between the dotted terminal of the secondary main winding and an output end, and a filter capacitor connected with two ends of the output in a bridging manner. When voltage of the dotted terminal of the secondary windings of the transformer is relatively high, voltage difference between drain-source electrodes of the second clamper tube is flexibly changed through adjusting the number of turns of winding, so the circuit operates under relatively low voltage stress conditions, thereby reducing loss in an operating process and improving reliability of the circuit.
Description
Technical field
The utility model belongs to DC/DC power circuit field, is specifically related to a kind of synchronous rectification driving circuit of Active Clamped Forward Converters.
Background technology
At present, the application of the power supply of the large electric current of output LOW voltage in the communications field is more and more wider, the power supply conversion efficiency that this just has relatively high expectations.In order to keep the high efficiency of power supply conversion, conventionally adopt the synchronous rectification of secondary.
Key in synchronous rectification is Driving technique.Using now the widest mode is the mode that self-powered or winding drive.Self-device synchronous rectification is because its circuit is simple, device is few, with low cost being used widely.But the rectifying tube of this mode and continued flow tube driving voltage change with the variation of input voltage, the too high meeting of driving voltage brings extra gate drive loss, and the conducting resistance of the too low metal-oxide-semiconductor of driving voltage is large, conduction loss increases.If driving voltage can be too high, the ability to bear that exceeds the two ends, grid source of metal-oxide-semiconductor can cause the fault of burning pipe.
In order to solve the too high problem of bringing of rectifying tube and continued flow tube driving voltage, prior art has provided a kind of follow-on synchronous commutation self-driving circuit scheme, refers to Fig. 1.In Fig. 1, direct-current input power supplying Vin charges to input capacitance C1, and the discharging current of input capacitance C1 is input to the elementary Same Name of Ends of the former limit of main transformer winding P1; The elementary different name end of the former limit of main transformer winding P1 is by an active clamp circuit ground connection.Wherein active clamp circuit is made up of nmos switch pipe Q1, PMOS switching tube Q2, clamp capacitor C5, in parallel with nmos switch pipe Q1 after clamp capacitor C5 and PMOS switching tube Q2 series connection, the grid of nmos switch pipe Q1 connects a drive output of pwm control circuit, and the grid of PMOS switching tube Q2 connects another drive output of pwm control circuit.Circuit of synchronous rectification is made up of two nmos switch pipe Q6 (rectifying tube), Q5 (continued flow tube), main transformer secondary winding S1 Same Name of Ends connects the drain electrode of continued flow tube Q5, and connect the grid of rectifying tube Q6 by nmos switch pipe Q3, the drain electrode of main transformer secondary winding S1 different name termination rectifying tube Q6, and connect the grid of continued flow tube Q5, the source ground of nmos switch pipe Q5 and Q6 by nmos switch pipe Q4; Wherein the drain electrode of nmos switch pipe Q3 connects main transformer secondary winding S1 Same Name of Ends, the source electrode of nmos switch pipe Q3 connects the grid of rectifying tube Q6, after being connected, the grid of nmos switch pipe Q3 and Q4 is connected to the output of voltage stabilizing circuit, the input of voltage stabilizing circuit is connected by diode D1 with main transformer secondary winding S1 Same Name of Ends, and is connected to ground by C4.One termination main transformer secondary winding S1 Same Name of Ends of inductance L 1, the other end is by capacitor C 2 ground connection; The tie point of inductance L 1 and capacitor C 2 is connected to the output of whole converter.
The scheme of Fig. 1 by increase nmos switch pipe Q3 and Q4 respectively clamper lived in rectifying tube Q6 and continued flow tube Q5 driving voltage, rectifying tube Q6 and continued flow tube Q5 driving voltage are no longer changed with the variation of input voltage, solved that driving voltage is too high brings extra gate drive loss.But the problem that the scheme of Fig. 1 still exists is: in the time that transformer secondary winding S1 Same Name of Ends voltage is higher, can between the drain-source utmost point of clamper tube Q3, produce higher voltage stress, increase the switching loss of clamper tube Q3, clamper tube Q3 can form focus simultaneously, reduces circuit reliability.
Utility model content
The utility model provides a kind of synchronous rectification driving circuit of Active Clamped Forward Converters, and its object is, avoids in the time that transformer secondary winding voltage is higher, produces higher voltage stress and the problem of switching loss on clamper tube, improves circuit reliability.
A synchronous rectification driving circuit for Active Clamped Forward Converters, comprising:
With the transformer of secondary main winding and the auxiliary winding of secondary;
Be connected in the first switching tube between Same Name of Ends and the ground of secondary main winding;
Be connected in the first clamper tube between different name end and first switching tube of secondary main winding;
Be connected in the second switch pipe between different name end and the ground of secondary main winding;
Be connected in secondary and assist the second clamper tube between Same Name of Ends and the second switch pipe of winding, the residue terminals of the second clamper tube and the residue terminals of the first clamper tube join;
Be connected in the outputting inductance between the Same Name of Ends of secondary main winding and converter output and be connected across converter output two ends filter capacitor.
Further, also comprise the voltage buffer circuit between different name end and the ground that is connected in the auxiliary winding of secondary, described voltage buffer circuit is made up of resistance and Capacitance parallel connection.
Further, described the first switching tube and second switch pipe adopt NMOS pipe to realize.
Further, described the first clamper tube and the second clamper tube adopt two independently NMOS pipe realize or adopt one comprise two independently the assembly of NMOS pipe realize, or one or two among them adopts other device of periodically connect secondary main winding and auxiliary winding to realize, described other device is digital control switch, bipolar devices or fieldtron.
Useful technique effect of the present utility model is embodied in:
The utility model is in the time that transformer secondary Motor Winding Same Name of Ends voltage is higher, assist the number of turn of winding can provide more flexibly suitable supply power voltage to be given to the drain electrode of the second clamper tube by secondary, the second clamper tube is operated under lower voltage stress, reduce the second clamper tube switching loss in the course of the work, thereby improve circuit reliability.Further, between the different name end of the auxiliary winding of secondary and ground, set up voltage buffer circuit, its Same Name of Ends voltage at secondary winding is timing, reduces the voltage difference between drain electrode and the source electrode of the second clamper tube, reduces its switching loss; When negative, reduce the voltage difference between grid and the source electrode of the second clamper tube at the Same Name of Ends voltage of secondary winding.This voltage buffer circuit can reduce the drain-source utmost point and the gate-source voltage stress of the second clamper tube, makes the switching loss of the second clamper tube be controlled at minimum value, effectively prevents that the gate-source voltage value of clamper tube from exceeding rated specification.
Brief description of the drawings
Fig. 1 is a kind of circuit of synchronous rectification structure chart of existing modified model Active Clamped Forward Converters.
Fig. 2 is the first execution mode schematic diagram of the Active Clamped Forward Converters circuit of synchronous rectification that provides of the utility model.
Fig. 3 is the schematic diagram of the second execution mode of the Active Clamped Forward Converters circuit of synchronous rectification that provides of the utility model.
Fig. 4 is a kind of specific embodiment that has adopted Active Clamped Forward Converters circuit of synchronous rectification shown in Fig. 2.
Fig. 5 is the oscillogram that has adopted the key node of a kind of specific embodiment of Active Clamped Forward Converters circuit of synchronous rectification shown in Fig. 2.
Fig. 6 is a kind of specific embodiment that has adopted Active Clamped Forward Converters circuit of synchronous rectification shown in Fig. 3.
Fig. 7 is the oscillogram that has adopted the key node of a kind of specific embodiment of Active Clamped Forward Converters circuit of synchronous rectification shown in Fig. 3.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.In addition,, in each execution mode of described the utility model, involved technical characterictic just can combine mutually as long as do not form each other conflict.
Fig. 2 is the first execution mode structural representation of the Active Clamped Forward Converters synchronous rectification driving circuit that provides of the utility model.In this embodiment, synchronous rectification driving circuit comprises the second switch pipe Q6 (rectifying tube) being connected between transformer secondary main winding S1 different name end and ground, and is connected to the first switching tube Q5 (continued flow tube) between transformer secondary main winding S1 Same Name of Ends and ground.Between the Same Name of Ends of transformer secondary main winding S1 and the output of circuit, be connected to outputting inductance L1, the other end of inductance L 1 is by filter capacitor C2 ground connection.The grid of second switch pipe Q6 is connected with the Same Name of Ends of the auxiliary winding S2 of transformer secondary by the second clamper tube Q3, and the grid of the first switching tube Q5 is connected with transformer secondary main winding S1 different name end by the first clamper tube Q4.The drain electrode of second switch pipe Q6 is connected with transformer secondary main winding S1 different name end, the source ground of second switch pipe Q6, the grid of second switch pipe Q6 is connected with the source electrode of the second clamper tube Q3, the drain electrode of the second clamper tube Q3 is connected with the Same Name of Ends of the auxiliary winding S2 of transformer secondary, the different name end ground connection of the auxiliary winding S2 of transformer secondary; The drain electrode of the first switching tube Q5 is connected with the Same Name of Ends of transformer secondary main winding S1, the source ground of second switch pipe Q6, the grid of the first switching tube Q5 is connected with the source electrode of the first clamper tube Q4, and the drain electrode of the first clamper tube Q4 is connected with the different name end of transformer secondary main winding S1; Two clamper tube Q3 are connected with the grid of Q4, and are jointly connected with the output of voltage stabilizing circuit, and the input of voltage stabilizing circuit connects the rear Same Name of Ends that connects secondary main winding S1 of rectifying tube D1 (diode).
In synchronous rectification driving circuit in the utility model, in the time of the switching tube Q1 conducting of former limit, the Same Name of Ends of transformer secondary winding S2 is positive voltage, just lower negative on meeting in the drawings, this voltage is applied directly in the drain electrode of clamper tube Q3, and the gate-source voltage of clamper tube Q3 poor be on the occasion of, and this voltage difference is greater than the threshold voltage of clamper tube Q3, make clamper tube Q3 conducting, and then make rectifying tube Q6 conducting, again due to the effect of clamper tube Q3, making that the gate-source voltage of rectifying tube Q6 is poor can be along with the change in voltage of transformer secondary winding S2 Same Name of Ends, its maximum is the threshold voltage value that stabilized circuit outputting voltage value deducts clamper tube Q3.Transformer secondary winding S1 provide energy by outputting inductance L1 and rectifying tube Q6 to output loading, and the linear rising of the electric current of outputting inductance L1.
In the time that former limit switching tube Q1 turn-offs, the different name end of transformer secondary winding S1 is positive voltage, and this voltage, by clamper tube Q4, is added on the grid of continued flow tube Q5, makes continued flow tube Q5 conducting.The different name end of transformer secondary winding S2 is positive voltage simultaneously, under satisfied in the drawings upper bearing, just, the electric charge of rectifying tube Q6 grid is discharged rapidly by the parasitic diode of clamper tube Q4, and rectifying tube Q6 turn-offs.Now the electric current of outputting inductance L1 is realized afterflow by continued flow tube Q5, for output provides electric current, and linear decline of electric current on outputting inductance L1.
In the time that transformer secondary Motor Winding Same Name of Ends voltage is higher, assist the number of turn of winding can provide more flexibly suitable supply power voltage to be given to the drain electrode of the second clamper tube by secondary, the second clamper tube is operated under lower voltage stress, reduce the second clamper tube switching loss in the course of the work, thereby improve circuit reliability.
Fig. 3 is Active Clamped Forward Converters synchronous rectification driving circuit the second execution mode structural representation that the utility model provides, which is the further improvement to first kind of way, its improvement is, between the different name end of the auxiliary winding S2 of secondary and ground, be connected in series voltage buffer circuit, this voltage buffer circuit can reduce the drain-source utmost point and the gate-source voltage stress of the second clamper tube Q3, make the switching loss of the second clamper tube Q3 be controlled at minimum value, improve conversion efficiency and the reliability of circuit.
Voltage buffer circuit is made up of capacitor C 3 and resistance R 3 parallel connections.The electric charge of capacitor C 3 is opened with blocking interval (being also positive period and negative cycle) and is shifted to regulate by secondary winding S2 at Q1; The pressure reduction at secondary winding S2 two ends is to be determined by the turn ratio of S2 and P1, fixes.In the time that switching tube Q1 opens, the Same Name of Ends voltage of secondary winding S2 is for just, now the electric charge in C3 discharges by S2, and formed the different name terminal potential of secondary winding S2 lower than the current potential of ground level, so the pressure reduction between drain electrode and the source electrode of the second clamper tube Q3 can be lower than secondary winding S2 different name end without R3 and the directly grounded situation of C3; In the time that switching tube Q1 turn-offs, the Same Name of Ends voltage of secondary winding S2 is for negative, now electric charge charges to capacitor C 3 by S2, make the different name terminal potential current potential of level above Ground of S2, so the drain electrode of the second clamper tube Q3 and source potential can be higher than secondary winding S2 different name end without R3 and the directly grounded situations of C3, now can play the effect that regulates the second clamper tube Q3 grid source electrode and drain-source interpolar pressure reduction.Resistance R 3 plays the effect of optimizing the voltage rise and fall time on C3.
Described second switch pipe and the second clamper tube adopt two independently NMOS pipe realizations, or adopt one to comprise two independently assembly realizations of NMOS pipe, or one or two among them adopts other device of periodically connect secondary main winding and auxiliary winding to realize, described other device is digital control switch, bipolar devices or fieldtron.
Fig. 4 shows an embodiment of the synchronous rectification driving circuit of Active Clamped Forward Converters shown in Fig. 2 the first execution mode.Transformer TX1 contains the auxiliary winding S2 of former limit winding P1 and secondary main winding S1 and secondary, and former limit winding P1 and the secondary main winding S1 turn ratio are 1:1, and the turn ratio of P1 and S2 is 4:1 simultaneously, is input as 48V direct voltage, and the switching frequency of switching tube Q1 is 300KHZ.Capacitor C 6, C4 and resistance R 4, R5 and voltage-stabiliser tube D2 have formed the voltage stabilizing circuit of an about 10V output.For convenience, this circuit diagram has used and the essentially identical circuit structure of Fig. 2 and components and parts label.
Fig. 5 shows the key node oscillogram of implementing circuit shown in Fig. 4, there is respectively the grid source electrode oscillogram Q1-Vgs of former limit switching tube Q1, the drain-source utmost point oscillogram Q5-Vds of secondary continued flow tube Q5, the grid source electrode oscillogram Q3-Vgs of clamper tube Q3 and drain-source utmost point oscillogram Q3-Vds, and output voltage waveform Vo.The maximum that can find out Q3-Vds from oscillogram is about 5V, illustrates by employing and assists winding S2 separately to after Q3 power supply, makes the drain-source voltage stress of Q3 reduce about 35V.
Fig. 6 shows an embodiment of the synchronous rectification driving circuit of Active Clamped Forward Converters shown in Fig. 3 the second execution mode.Transformer TX1 contains the auxiliary winding S2 of former limit winding P1 and secondary main winding S1 and secondary, this circuit is the effect that better embodies voltage buffer circuit R3 and C3, former limit winding P1 and the secondary main winding S1 turn ratio are 1:1, the turn ratio of P1 and S2 is 2:1 simultaneously, be input as 48V direct voltage, the switching frequency of switching tube Q1 is 300KHZ.Capacitor C 6, C4 and resistance R 4, R5 and voltage-stabiliser tube D2 have formed the voltage stabilizing circuit of an about 10V output.For convenience, this circuit diagram has used and the essentially identical circuit structure of Fig. 3 and components and parts part label.
Fig. 7 shows the key node oscillogram of implementing circuit shown in Fig. 6, there is respectively the grid source electrode oscillogram Q1-Vgs of former limit switching tube Q1, the drain-source utmost point oscillogram Q5-Vds of secondary continued flow tube Q5, voltage in capacitor C 3, the drain-source utmost point oscillogram Q3-Vds of clamper tube Q3 and grid source electrode oscillogram Q3-Vgs, and output voltage waveform Vo.From oscillogram, can find out, the voltage in capacitor C 3 is to change with the switch periods of switching tube Q1, and positive peak is about 8V, be about-8V of negative peak; The drain-source voltage stress maximum of clamper tube Q3 is about 8V simultaneously, and gate-source voltage stress is about 11V.Illustrate that buffer circuit R3 and C3 can well reduce the drain-source utmost point of clamper tube Q3 and the voltage stress of grid source electrode.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. a synchronous rectification driving circuit for Active Clamped Forward Converters, is characterized in that, comprising:
With the transformer of secondary main winding and the auxiliary winding of secondary;
Be connected in the first switching tube between Same Name of Ends and the ground of secondary main winding;
Be connected in the first clamper tube between different name end and first switching tube of secondary main winding;
Be connected in the second switch pipe between different name end and the ground of secondary main winding;
Be connected in secondary and assist the second clamper tube between Same Name of Ends and the second switch pipe of winding, the residue terminals of the second clamper tube and the residue terminals of the first clamper tube join;
Be connected in the outputting inductance between the Same Name of Ends of secondary main winding and converter output and be connected across converter output two ends filter capacitor.
2. the synchronous rectification driving circuit of Active Clamped Forward Converters according to claim 1, it is characterized in that, also comprise the voltage buffer circuit between different name end and the ground that is connected in the auxiliary winding of secondary, described voltage buffer circuit is made up of resistance and Capacitance parallel connection.
3. the synchronous rectification driving circuit of Active Clamped Forward Converters according to claim 1 and 2, is characterized in that, described the first switching tube and second switch pipe adopt NMOS pipe to realize.
4. the synchronous rectification driving circuit of Active Clamped Forward Converters according to claim 1 and 2, it is characterized in that, described the first clamper tube and the second clamper tube adopt two independently NMOS pipe realize or adopt one comprise two independently the assembly of NMOS pipe realize, or one or two among them adopts other device of periodically connect secondary main winding and auxiliary winding to realize, described other device is digital control switch, bipolar devices or fieldtron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231701.1U CN203911791U (en) | 2014-05-07 | 2014-05-07 | Synchronous rectification drive circuit of active clamping forward converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231701.1U CN203911791U (en) | 2014-05-07 | 2014-05-07 | Synchronous rectification drive circuit of active clamping forward converter |
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| CN203911791U true CN203911791U (en) | 2014-10-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099232A (en) * | 2014-05-07 | 2015-11-25 | 武汉永力睿源科技有限公司 | Synchronous rectification drive circuit for active clamping forward converter |
| CN106411134A (en) * | 2015-07-30 | 2017-02-15 | 罗姆股份有限公司 | DC/DC converter, power supply device, power adapter and electronic device |
| TWI751768B (en) * | 2020-11-02 | 2022-01-01 | 宏碁股份有限公司 | Soft-start boost converter |
-
2014
- 2014-05-07 CN CN201420231701.1U patent/CN203911791U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099232A (en) * | 2014-05-07 | 2015-11-25 | 武汉永力睿源科技有限公司 | Synchronous rectification drive circuit for active clamping forward converter |
| CN106411134A (en) * | 2015-07-30 | 2017-02-15 | 罗姆股份有限公司 | DC/DC converter, power supply device, power adapter and electronic device |
| TWI751768B (en) * | 2020-11-02 | 2022-01-01 | 宏碁股份有限公司 | Soft-start boost converter |
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