CN104578739B - Active clamping circuit of quasi-resonant flyback converter - Google Patents
Active clamping circuit of quasi-resonant flyback converter Download PDFInfo
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- CN104578739B CN104578739B CN201510027788.XA CN201510027788A CN104578739B CN 104578739 B CN104578739 B CN 104578739B CN 201510027788 A CN201510027788 A CN 201510027788A CN 104578739 B CN104578739 B CN 104578739B
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- switching tube
- resistance
- electric capacity
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- clamping
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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
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an active clamping circuit of a quasi-resonant flyback converter. According to the circuit, a clamping capacitor C1 and a clamping switching tube Q1 are connected into the two ends of an isolation transformer primary main winding NP in parallel, an auxiliary winding NAU is added to the primary main winding of an isolation transformer, the non-dotted terminal of the auxiliary winding NAU is connected with the source electrode of the clamping switching tube Q1, the dotted terminal of the auxiliary winding NAU outputs signals, after delay processing is carried out on the signals through a differential formed by a capacitor C3 and a resistor R1 and an integral formed by a resistor R2 and a capacitor C4 which are cascaded, and the signals are shaped by a switching tube Q3 to form regular pulses to drive the clamping switching tube Q1. The driving signal of the clamping switching tube Q1 and the driving signal of a main switching tube are not complementary in phase like a traditional active clamping circuit, the pulse width is fixed and narrow, the energy of a leakage inductor can completely flow back and be released, and due to the fact that the connecting time of the clamping switching tube Q1 is short, an MOS transistor with a small current specification can be adopted, the efficiency of the quasi-resonant flyback converter is improved, and electromagnetic interference is reduced.
Description
Technical field
The present invention relates to power technique fields, more particularly to a kind of active clamping circuir of quasi-resonance inverse excitation type converter.
Background technology
At present, the power metal-oxide semiconductor field effect transistor (metal-oxide-semiconductor) of quasi-resonance (QR) inverse excitation type converter
From cut-off to conducting conversion when, with minimum drain-source voltage, reduce conducting electric current spike and have less conduction loss,
Alleviate the electromagnetic interference (EMI) of power supply；Simultaneously it is the same with tradition inverse excitation type converter, and topological structure is simple, in medium and small work(
It is widely used in rate Switching Power Supply.But, the power MOS pipe of quasi-resonance inverse excitation type converter is being become from conducting to cut-off
When changing, the resonance that the output capacitance between leakage inductance and drain-source is produced will bring due to voltage spikes and electromagnetic interference, in this, with biography
System inverse excitation type converter is compared, and quasi-resonance inverse excitation type converter does not have any improvement, and voltage point is suppressed still through RCD clamps
Peak, this portion of energy is consumed by resistance heating, is reduced transducer effciency and is failed effectively to reduce electromagnetic interference.Such as Fig. 1 institutes
Show, Fig. 1 is Emmitter diven quasi circuit structure diagram of the tradition with RCD clamps, Fig. 2 is the voltage between switching tube Q2 drain-sources
Oscillogram.
The content of the invention
It is an object of the invention to pass through a kind of active clamping circuir of quasi-resonance inverse excitation type converter to solve the above back of the body
The problem that scape technology segment is mentioned.
It is that, up to this purpose, the present invention is employed the following technical solutions：
A kind of active clamping circuir of quasi-resonance inverse excitation type converter, including clamping capacitance C1, clamp switch pipe Q1, switch
Pipe Q2, diode D1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, electric capacity C4 and switching tube Q3；Wherein, it is described
The non-same polarity of one end of clamping capacitance C1 main winding NP primary with the positive pole of direct voltage source E1, isolating transformer in converter
Connection, the other end connects the drain electrode of clamp switch pipe Q1；The source electrode of the clamp switch pipe Q1 it is primary with isolating transformer it is main around
Non-same polarity, the drain electrode of switching tube Q2, the electric capacity of the Same Name of Ends of group NP, primary increased assists winding NAU of isolating transformer
The negative pole of C2, one end of resistance R1, one end of electric capacity C4, the source electrode connection of switching tube Q3, the Same Name of Ends of assists winding NAU and two
The anode of pole pipe D1, one end connection of electric capacity C3, the other end of electric capacity C3 connects with one end of the other end of resistance R1, resistance R2
Connect, the other end of resistance R2 is connected with the grid of the other end of electric capacity C4, switching tube Q3, the negative electrode of diode D1 is with resistance R3's
One end, the positive pole connection of electric capacity C2, the other end of resistance R3 is connected with the drain electrode of the grid of clamp switch pipe Q1, switching tube Q3；
The source electrode of the switching tube Q2 connects the negative pole of direct voltage source E1, and grid connects the output end of quasi resonant control KT1.
The active clamping circuir of quasi-resonance inverse excitation type converter proposed by the present invention solves traditional quasi-resonance inverse-excitation type and becomes
The problem that parallel operation is present, it is at the primary main winding NP two ends of isolating transformer and accesses clamping capacitance C1 and clamp switch pipe
Q1, primary in isolating transformer increases assists winding NAU, and its non-same polarity is connected with the source electrode of clamp switch pipe Q1,
Same Name of Ends output signal is constituted at the integration time delay of resistance R2, the electric capacity C4 composition of differential and cascade via electric capacity C3, resistance R1
After reason, Jing after switching tube Q3 is shaped to regular pulses drive clamp switch pipe Q1, the drive signal of this clamp switch pipe Q1 with
Switching tube Q2 be main switch drive signal unlike other active clamping circuirs be in phase place it is complementary, its pulsewidth consolidate
Fixed and narrower, energy total reflux discharges the energy of leakage inductance, because the ON time of clamp switch pipe Q1 is short, therefore can adopt
The little metal-oxide-semiconductor of current specification, improves the efficiency of quasi-resonance inverse excitation type converter and reduces electromagnetic interference.
Description of the drawings
Fig. 1 is Emmitter diven quasi circuit structure diagram of the tradition with RCD clamps；
Fig. 2 is the voltage oscillogram between switching tube Q2 drain-sources；
Fig. 3 is the active clamping circuir structure chart of quasi-resonance inverse excitation type converter provided in an embodiment of the present invention；
Fig. 4 is the voltage oscillogram between switching tube Q2 drain-sources provided in an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples the invention will be further described.It is understood that tool described herein
Body embodiment is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, for the ease of retouching
State, part related to the present invention rather than full content are illustrate only in accompanying drawing, it is unless otherwise defined, used herein all
Technology and scientific terminology it is identical with the implication that is generally understood that of those skilled in the art for belonging to the present invention.Made herein
Term is intended merely to describe the purpose of specific embodiment, it is not intended that of the invention in limiting.Term as used herein
" and/or " including the arbitrary and all of combination of one or more related Listed Items.
Refer to shown in Fig. 3, Fig. 3 is the active clamping circuir of quasi-resonance inverse excitation type converter provided in an embodiment of the present invention
Structure chart.
The active clamping circuir of quasi-resonance inverse excitation type converter specifically includes clamping capacitance C1, clamp switch in the present embodiment
Pipe Q1, switching tube Q2, diode D1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, electric capacity C4 and switching tube Q3.
Specifically, in one end of the clamping capacitance C1 and converter at the beginning of positive pole, the isolating transformer of direct voltage source E1
The non-same polarity connection of level main winding NP, the other end connects the drain electrode of clamp switch pipe Q1, the secondary of the isolating transformer around
Group NS two ends are connected with diode D2, electric capacity C5；The source electrode of the clamp switch pipe Q1 and isolating transformer primary main winding NP
Same Name of Ends, the non-same polarity of primary increased assists winding NAU of isolating transformer, the drain electrode of switching tube Q2, electric capacity C2
Negative pole, one end of resistance R1, one end of electric capacity C4, the source electrode connection of switching tube Q3, the Same Name of Ends and diode of assists winding NAU
The anode of D1, one end connection of electric capacity C3, the other end of electric capacity C3 is connected with one end of the other end of resistance R1, resistance R2, electricity
The other end of resistance R2 is connected with the other end of electric capacity C4, the grid of switching tube Q3, the negative electrode of diode D1 and one end of resistance R3,
The positive pole connection of electric capacity C2, the other end of resistance R3 is connected with the drain electrode of the grid of clamp switch pipe Q1, switching tube Q3；It is described to open
The source electrode for closing pipe Q2 connects the negative pole of direct voltage source E1, and grid connects the output end of quasi resonant control KT1.Need explanation
It is that the clamp switch pipe Q1 can select any one of NMOS tube or PMOS.The switching tube Q3, can used as pulse shaper
To realize from NMOS tube, also replacement can be combined by a NMOS tube shaping and a NMOS tube paraphase.The confession of pulse shaper
The pulse signal that electricity is directly produced from assists winding NAU is provided Jing after diode D1 rectifications and electric capacity C2 filtering.
NMOS tube, switching tube Q3 is selected to select as a example by PMOS with clamp switch pipe Q1, quasi-resonance flyback in the present embodiment
The active clamping circuir of formula converter replaces RCD circuits in Fig. 1 with a clamping capacitance C1 and a clamp switch pipe Q1 concatenation,
The source driving signal of clamp switch pipe Q1 is produced by primary increased assists winding NAU of isolating transformer, assists winding NAU
Non-same polarity be connected with the source electrode of clamp switch pipe Q1 and as clamp switch pipe Q1 gate drive signal process public ginseng
Examination point.The signal of assists winding NAU Same Name of Ends output constitutes resistance R2, the electric capacity of differential and cascade via electric capacity C3, resistance R1
After the integration delay process of C4 compositions, regular pulsed drive clamp switch pipe Q1 is shaped to by switching tube Q3；This clamp is opened
The drive signal and switching tube Q2 for closing pipe is the drive signal of main switch unlike conventional active clamp circuit is mutual in phase place
Mend, its pulsewidth is fixed and narrower, if can total reflux discharge the energy of leakage inductance because clamp switch pipe is led
The logical time is short, therefore can adopt the little MOSFET of current specification, therefore in the case where limited cost is increased, further increases standard
The efficiency of harmonic anti exciting converter and reduce electromagnetic interference.Voltage oscillogram between the present embodiment breaker in middle pipe Q2 drain-sources is as schemed
Shown in 4.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (1)
1. a kind of active clamping circuir of quasi-resonance inverse excitation type converter, it is characterised in that including clamping capacitance C1, clamp switch
Pipe Q1, switching tube Q2, diode D1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, electric capacity C4 and switching tube Q3；
Wherein, one end of the clamping capacitance C1 and the positive pole of direct voltage source E1, isolating transformer primary main winding NP in converter
Non-same polarity connection, the other end connect clamp switch pipe Q1 drain electrode；The source electrode of the clamp switch pipe Q1 with isolate transformation
The Same Name of Ends of device primary main winding NP, the non-same polarity of primary increased assists winding NAU of isolating transformer, switching tube Q2
Drain electrode, the negative pole of electric capacity C2, one end of resistance R1, one end of electric capacity C4, the source electrode connection of switching tube Q3, assists winding NAU
Same Name of Ends is connected with the anode of diode D1, one end of electric capacity C3, the other end of electric capacity C3 and the other end of resistance R1, resistance R2
One end connection, the other end of resistance R2 is connected with the grid of the other end of electric capacity C4, switching tube Q3, the negative electrode of diode D1 and
One end of resistance R3, the positive pole connection of electric capacity C2, the other end of resistance R3 and grid, the leakage of switching tube Q3 of clamp switch pipe Q1
Pole connects；The source electrode of the switching tube Q2 connects the negative pole of direct voltage source E1, and grid connects the output of quasi resonant control KT1
End.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510027788.XA CN104578739B (en) | 2015-01-20 | 2015-01-20 | Active clamping circuit of quasi-resonant flyback converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510027788.XA CN104578739B (en) | 2015-01-20 | 2015-01-20 | Active clamping circuit of quasi-resonant flyback converter |
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| Publication Number | Publication Date |
|---|---|
| CN104578739A CN104578739A (en) | 2015-04-29 |
| CN104578739B true CN104578739B (en) | 2017-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510027788.XA Active CN104578739B (en) | 2015-01-20 | 2015-01-20 | Active clamping circuit of quasi-resonant flyback converter |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086789B (en) * | 2017-04-27 | 2023-06-02 | 天宝电子（惠州）有限公司 | Secondary control quasi-resonance switching power supply converter |
| CN107196517B (en) * | 2017-07-04 | 2019-07-19 | 广州金升阳科技有限公司 | The driving circuit of clamp switch in Switching Power Supply |
| CN112271926B (en) * | 2020-09-27 | 2021-09-07 | 东南大学 | Prediction current mode control method of GaN-based active clamp flyback converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102763315A (en) * | 2010-02-23 | 2012-10-31 | 株式会社村田制作所 | Switching power supply apparatus |
| CN103368402A (en) * | 2012-03-26 | 2013-10-23 | 株式会社村田制作所 | Switching power supply apparatus |
| CN204465333U (en) * | 2015-01-20 | 2015-07-08 | 无锡三石电子有限公司 | A kind of active clamping circuir of quasi-resonance inverse excitation type converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9559601B2 (en) * | 2013-02-28 | 2017-01-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Forward-flyback topology switched mode power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102763315A (en) * | 2010-02-23 | 2012-10-31 | 株式会社村田制作所 | Switching power supply apparatus |
| CN103368402A (en) * | 2012-03-26 | 2013-10-23 | 株式会社村田制作所 | Switching power supply apparatus |
| CN204465333U (en) * | 2015-01-20 | 2015-07-08 | 无锡三石电子有限公司 | A kind of active clamping circuir of quasi-resonance inverse excitation type converter |
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