CN104578739A - Active clamping circuit of quasi-resonant flyback converter - Google Patents
Active clamping circuit of quasi-resonant flyback converter Download PDFInfo
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- CN104578739A CN104578739A CN201510027788.XA CN201510027788A CN104578739A CN 104578739 A CN104578739 A CN 104578739A CN 201510027788 A CN201510027788 A CN 201510027788A CN 104578739 A CN104578739 A CN 104578739A
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- switching tube
- resistance
- electric capacity
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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
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, particularly relate to a kind of active clamping circuir of quasi-resonance inverse excitation type converter.
Background technology
At present, power metal-the oxide semiconductor field effect transistor (metal-oxide-semiconductor) of quasi-resonance (QR) inverse excitation type converter is when being converted to conducting by cut-off, there is minimum drain-source voltage, reduce On current spike and there is less conduction loss, alleviate the electromagnetic interference of power supply (EMI); It is the same with traditional inverse excitation type converter simultaneously, and topological structure is simple, is widely used in middle low power Switching Power Supply.But, the power MOS pipe of quasi-resonance inverse excitation type converter is when being converted to cut-off by conducting, the resonance that output capacitance between leakage inductance and drain-source produces will bring due to voltage spikes and electromagnetic interference, in this, compared with classical inverse excitation type converter, quasi-resonance inverse excitation type converter, without any improvement, still suppresses due to voltage spikes by RCD clamp, this part energy is consumed by resistance heating, reduces transducer effciency and fails effectively to reduce electromagnetic interference.As shown in Figure 1, Fig. 1 is the Emmitter diven quasi circuit structure diagram of tradition with RCD clamp, and Fig. 2 is the voltage oscillogram between switching tube Q2 drain-source.
Summary of the invention
The object of the invention is to the active clamping circuir by a kind of quasi-resonance inverse excitation type converter, solve the problem that above background technology part is mentioned.
For reaching this object, the present invention by the following technical solutions:
An active clamping circuir for quasi-resonance inverse excitation type converter, comprises 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 described clamping capacitance C1 is connected with the non-same polarity of the positive pole of direct voltage source E1 in converter, the elementary main winding NP of isolating transformer, and the other end connects the drain electrode of clamp switch pipe Q1, the source electrode of described clamp switch pipe Q1 and the Same Name of Ends of the elementary main winding NP of isolating transformer, the non-same polarity of the auxiliary winding NAU of the elementary increase of isolating transformer, the drain electrode of switching tube Q2, the negative pole of electric capacity C2, one end of resistance R1, one end of electric capacity C4, the grid of switching tube Q3 connects, the auxiliary Same Name of Ends of winding NAU and the anode of diode D1, one end of electric capacity C3 connects, the other end of electric capacity C3 and the other end of resistance R1, one end of resistance R2 connects, the other end of resistance R2 and the other end of electric capacity C4, the grid of switching tube Q3 connects, the negative electrode of diode D1 and one end of resistance R3, the positive pole of electric capacity C2 connects, the other end of resistance R3 and the grid of clamp switch pipe Q1, the drain electrode of switching tube Q3 connects, the source electrode of described switching tube Q2 connects the negative pole of direct voltage source E1, and grid connects the output of quasi resonant control KT1.
The active clamping circuir of the quasi-resonance inverse excitation type converter that the present invention proposes solves traditional quasi-resonance inverse excitation type converter Problems existing, clamping capacitance C1 and clamp switch pipe Q1 is also accessed in its elementary main winding NP two ends at isolating transformer, at the auxiliary winding NAU of elementary increase by of isolating transformer, its non-same polarity is connected with the source electrode of clamp switch pipe Q1, Same Name of Ends output signal is via electric capacity C3, resistance R1 forms the resistance R2 of differential and cascade, after the integration delay process that electric capacity C4 forms, regular pulses rear drive clamp switch pipe Q1 is shaped to through switching tube Q3, the drive singal of this clamp switch pipe Q1 and the drive singal of switching tube Q2 and main switch are complementary unlike other active clamping circuir in phase place, its pulsewidth is fixed and narrower, energy total reflux discharges the energy of leakage inductance, because the ON time of clamp switch pipe Q1 is short, therefore the metal-oxide-semiconductor that current specification is little can be adopted, improve the efficiency of quasi-resonance inverse excitation type converter and reduce electromagnetic interference.
Accompanying drawing explanation
Fig. 1 is the Emmitter diven quasi circuit structure diagram of tradition with RCD clamp;
Fig. 2 is the voltage oscillogram between switching tube Q2 drain-source;
The active clamping circuir structure chart of the quasi-resonance inverse excitation type converter that Fig. 3 provides for the embodiment of the present invention;
Voltage oscillogram between the switching tube Q2 drain-source that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content, unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Please refer to shown in Fig. 3, the active clamping circuir structure chart of the quasi-resonance inverse excitation type converter that Fig. 3 provides for the embodiment of the present invention.
In the present embodiment, the active clamping circuir of quasi-resonance inverse excitation type converter specifically comprises 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.
Concrete, one end of described clamping capacitance C1 is connected with the non-same polarity of the positive pole of direct voltage source E1 in converter, the elementary main winding NP of isolating transformer, the other end connects the drain electrode of clamp switch pipe Q1, and the secondary winding NS two ends of described isolating transformer are connected with diode D2, electric capacity C5, the source electrode of described clamp switch pipe Q1 and the Same Name of Ends of the elementary main winding NP of isolating transformer, the non-same polarity of the auxiliary winding NAU of the elementary increase of isolating transformer, the drain electrode of switching tube Q2, the negative pole of electric capacity C2, one end of resistance R1, one end of electric capacity C4, the grid of switching tube Q3 connects, the auxiliary Same Name of Ends of winding NAU and the anode of diode D1, one end of electric capacity C3 connects, the other end of electric capacity C3 and the other end of resistance R1, one end of resistance R2 connects, the other end of resistance R2 and the other end of electric capacity C4, the grid of switching tube Q3 connects, the negative electrode of diode D1 and one end of resistance R3, the positive pole of electric capacity C2 connects, the other end of resistance R3 and the grid of clamp switch pipe Q1, the drain electrode of switching tube Q3 connects, the source electrode of described switching tube Q2 connects the negative pole of direct voltage source E1, and grid connects the output of quasi resonant control KT1.It should be noted that, described clamp switch pipe Q1 can select any one of NMOS tube or PMOS.Described switching tube Q3, as pulse shaper, can select NMOS tube to realize, and also can be combined by a NMOS tube shaping and a NMOS tube paraphase and replace.The pulse signal that the power supply of pulse shaper directly produces from auxiliary winding NAU provides after diode D1 rectification and electric capacity C2 filtering.
NMOS tube is selected with clamp switch pipe Q1, switching tube Q3 selects PMOS to be example, in the present embodiment, the active clamping circuir of quasi-resonance inverse excitation type converter is connected in series with an a clamping capacitance C1 and clamp switch pipe Q1 and replaces RCD circuit in Fig. 1, the source driving signal of clamp switch pipe Q1 is produced by the auxiliary winding NAU of the elementary increase of isolating transformer, and the non-same polarity of auxiliary winding NAU is connected with the source electrode of clamp switch pipe Q1 and the common reference point of gate drive signal process as clamp switch pipe Q1.The signal that auxiliary winding NAU Same Name of Ends exports is shaped to regular pulsed drive clamp switch pipe Q1 by switching tube Q3 after forming the integration delay process of resistance R2, electric capacity C4 composition of differential and cascade via electric capacity C3, resistance R1; The drive singal of this clamp switch pipe and the drive singal of switching tube Q2 and main switch are complementary unlike conventional active clamp circuit in phase place, its pulsewidth is fixed and narrower, as long as energy total reflux discharges the energy of leakage inductance, because the ON time of clamp switch pipe is short, therefore the MOSFET that current specification is little can be adopted, therefore, when increasing limited cost, further increasing the efficiency of Emmitter diven quasi and reducing electromagnetic interference.Voltage oscillogram between the present embodiment breaker in middle pipe Q2 drain-source as shown in Figure 4.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (1)
1. the active clamping circuir of a quasi-resonance inverse excitation type converter, it is characterized in that, comprise 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 described clamping capacitance C1 is connected with the non-same polarity of the positive pole of direct voltage source E1 in converter, the elementary main winding NP of isolating transformer, and the other end connects the drain electrode of clamp switch pipe Q1, the source electrode of described clamp switch pipe Q1 and the Same Name of Ends of the elementary main winding NP of isolating transformer, the non-same polarity of the auxiliary winding NAU of the elementary increase of isolating transformer, the drain electrode of switching tube Q2, the negative pole of electric capacity C2, one end of resistance R1, one end of electric capacity C4, the grid of switching tube Q3 connects, the auxiliary Same Name of Ends of winding NAU and the anode of diode D1, one end of electric capacity C3 connects, the other end of electric capacity C3 and the other end of resistance R1, one end of resistance R2 connects, the other end of resistance R2 and the other end of electric capacity C4, the grid of switching tube Q3 connects, the negative electrode of diode D1 and one end of resistance R3, the positive pole of electric capacity C2 connects, the other end of resistance R3 and the grid of clamp switch pipe Q1, the drain electrode of switching tube Q3 connects, the source electrode of described switching tube Q2 connects the negative pole of direct voltage source E1, and grid connects the output of quasi resonant control KT1.
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 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510027788.XA CN104578739B (en) | 2015-01-20 | 2015-01-20 | Active clamping circuit of quasi-resonant flyback converter |
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| CN104578739A true CN104578739A (en) | 2015-04-29 |
| CN104578739B CN104578739B (en) | 2017-04-26 |
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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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086789A (en) * | 2017-04-27 | 2017-08-22 | 天宝电子（惠州）有限公司 | A kind of switching power converters of secondary control quasi-resonance |
| CN107196517A (en) * | 2017-07-04 | 2017-09-22 | 广州金升阳科技有限公司 | The drive circuit and driving method of clamp switch in Switching Power Supply |
| CN112271926A (en) * | 2020-09-27 | 2021-01-26 | 东南大学 | Prediction current mode control method of GaN-based active clamping flyback converter |
Citations (4)
| 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 |
| WO2014131455A1 (en) * | 2013-02-28 | 2014-09-04 | Telefonaktiebolaget L M Ericsson (Publ) | Forward-flyback topology switched mode power supply |
| 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 |
-
2015
- 2015-01-20 CN CN201510027788.XA patent/CN104578739B/en active Active
Patent Citations (4)
| 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 |
| WO2014131455A1 (en) * | 2013-02-28 | 2014-09-04 | Telefonaktiebolaget L M Ericsson (Publ) | Forward-flyback topology switched mode power supply |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086789A (en) * | 2017-04-27 | 2017-08-22 | 天宝电子（惠州）有限公司 | A kind of switching power converters of secondary control quasi-resonance |
| 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 |
| CN107196517A (en) * | 2017-07-04 | 2017-09-22 | 广州金升阳科技有限公司 | The drive circuit and driving method of clamp switch in Switching Power Supply |
| CN112271926A (en) * | 2020-09-27 | 2021-01-26 | 东南大学 | Prediction current mode control method of GaN-based active clamping flyback converter |
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| CN104578739B (en) | 2017-04-26 |
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