CN102122890A - Control method for auxiliary switching tube of active clamp flyback converter - Google Patents
Control method for auxiliary switching tube of active clamp flyback converter Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 230000000295 complement effect Effects 0.000 abstract description 2
- 239000004973 liquid crystal related substance Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000003071 parasitic effect Effects 0.000 description 6
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- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention relates to a control method for an auxiliary switching tube of an active clamp flyback converter. In the flyback converter, severe energy loss and voltage spike of a main switching tube are caused due to leakage inductance of a transformer and leakage inductance of circuits. The conventional solution mainly comprises methods for solving the problems by using residual current device (RCD) clamp, liquid crystal display (LCD) clamp and active clamp, wherein an active clamp circuit can effectively recover leakage inductance energy and obviously improve the efficiency. The invention provides a novel control method on the basis of the conventional active clamp flyback converter topology. In the conventional control method, a primary side switching tube is in complementary conduction with an auxiliary switching tube in each period; and in the control method, the primary side switching tube is switched on in each period, the auxiliary switching tube is controlled by setting voltage of a clamp capacitor in the clamp circuit, and when the voltage of the clamp capacitor reaches the set value, the auxiliary switching tube is switched on. Compared with the prior art, the method has the advantages that: the switching loss of the auxiliary switching tube can be reduced; and more importantly, the efficiency of the circuit can be greatly improved under a light load, and the no-load loss is reduced.
Description
Technical field
The present invention relates to the controlling party converters owned by France of active clamp anti exciting converter auxiliary switch.
Background technology
There are three kinds below traditional control method that flyback converter leakage inductance reclaims:
The 1:RCD clamp circuit
RCD clamp circuit structure is the simplest, and cost is minimum, be easy to realize, but the energy in the leakage inductance all consumes in the buffer resistance, has reduced the efficient of converter, and it is applicable to the occasion of and cost strict control less demanding to efficient.
The 2:LCD clamp circuit
The LCD clamp circuit can be realized the leakage inductance energy feedback of passive and nondestructive, but need outer coilloading, parameter tuning is difficulty relatively, but bigger LC resonance current has increased the conduction loss of power switch during high frequency, generally is applicable to the occasion of switching frequency not too high (as tens kHz)
3: active clamp circuit
Active clamp circuit has increased electric capacity and auxiliary switch, and traditional active clamp control method is in one-period, main switch and and the complementary conducting of auxiliary switch, can realize the leakage inductance energy feedback, realize the soft switch of main switch and auxiliary switch, can realize high frequency conversion.Though at full load, the anti-sharp control circuit efficient of traditional active clamp is very high, efficient is still not high when underloading.
Summary of the invention
The objective of the invention is to the defective that exists at above-mentioned prior art, develop a kind of can overcome have defective now, efficient is not high, inverse-excitation type direct current-stream power supply change-over device that particularly light-load efficiency is not high.
Inverse-excitation type direct current-stream the power supply change-over device of realization above-mentioned purpose is made up of inverse-excitation type main circuit and active clamp circuit.Circuit of reversed excitation comprises an input port, one or more transformers, and former limit switching tube, the secondary rectifier diode, filter capacitor and an output port are formed.When the switching tube conducting, rectifier diode ends, and the energy of power supply input is stored in the transformer with the form of magnetic energy, and when switching tube ended, energy stored was transferred to load in the transformer.Active clamp circuit comprises an auxiliary switch, a parasitic diode and an absorption electric capacity.Wherein parasitic diode is the inverse parallel body diode of auxiliary switch parasitism.Auxiliary switch with absorb the electric capacity composition auxiliary circuit that is in series.Auxiliary branch is connected in parallel on the transformer winding two ends, former limit or the switching tube two ends, former limit in parallel of circuit of reversed excitation.Each cycle of former limit switching tube is all open-minded, and auxiliary switch is just open-minded every several cycles.
The production method of the control signal of auxiliary switch S2 is for (with voltage threshold circuit 2 is example in the control circuit, as Fig. 2): when the voltage among the clamp capacitor Cr runs up to a certain value, the voltage Vr that obtains by divider resistance R1 and R2 also can rise to a certain value, this value compares by the reference voltage V ref with artificial setting, as voltage Vr during less than reference voltage V ref, low level of comparator output is to reset terminal R, this moment, Q ' kept low level always, auxiliary switch S2 is in off state, clamp capacitor Cr is in charged state, and charging can continue one-period or several cycle.When clamp capacitor Cr is charged to a certain degree, voltage Vr can be greater than reference voltage V ref, high level of comparator output this moment is to reset terminal R, this moment, drive signal Vpulse was in low level state, and then Q ' can export a high level, thereby can make auxiliary switch S2 open-minded, by the property list of SR latch as can be seen, as long as set end S is a low level state, Q ' can export a high level always, makes auxiliary switch S2 open-minded always.Because the clamp capacitor Cr velocity of discharge is very fast, comparator can be exported a low level very soon, so the service time of auxiliary switch S2 can be set by drive signal Vpulse.After clamp capacitor Cr discharge is finished, can set drive signal Vpulse high level, then auxiliary switch S2 turn-offs immediately.Note, open-minded in the time of for fear of S1 and S2 two pipes, drive signal Vpulse high level must former limit switching tube S1 open signal comes before just be provided with.
The control method of active clamp anti exciting converter of the present invention has following advantage, and leakage inductance energy has obtained recovery, and the power transfer of leakage inductance is to output, is implemented in the cycle that auxiliary switch opens the soft switch of former limit switch simultaneously; By controlling opening and turn-offing of auxiliary switch, can reduce the switch number of times of auxiliary switch, reduced the switching loss of auxiliary switch, can improve the efficient of circuit under underloading greatly, reduce no-load loss.
Description of drawings
The anti exciting converter schematic diagram of the control method of first kind of new active clamp auxiliary switch that Fig. 1 this patent proposes.Among the figure shown in the frame of broken lines is voltage threshold control circuit 1.
The anti exciting converter schematic diagram of the control method of second kind of new active clamp auxiliary switch that Fig. 2 this patent proposes.Among the figure shown in the frame of broken lines is voltage threshold control circuit 2.
Fig. 3 is based on the active clamp auxiliary switch control method of voltage threshold control circuit 2, the gate pulse of anti exciting converter main switch and auxiliary switch and work wave.
The anti exciting converter work schematic diagram that Fig. 4 this patent proposes based on the new control method of the active clamp auxiliary switch of voltage threshold control circuit 2.Work schematic diagram when figure (a) opens for main switch S1; Figure (b) is that main open pipe S1 closes the schematic diagram of having no progeny to parasitic capacitance C1 charging; Figure (c) gives clamp capacitor Cr the schematic diagram of charging for leakage inductance energy; When the voltage that figure (d) is got by resistance for clamp capacitor Cr reached fiducial value, auxiliary switch S2 was open-minded, the schematic diagram of clamp capacitor Cr discharge
Embodiment
(1) in conjunction with Fig. 3, in the t0 moment, auxiliary switch S2 is turned off, and former limit switching tube S1 and auxiliary switch S2 are in off state simultaneously.t
1Former limit switching tube S1 conducting constantly, primary current rises, the transformer storage power, auxiliary switch S2 and output rectifier diode D end.Magnetizing inductance Lm and leakage inductance Lr linear-charging.Clamp capacitor Cr constant in energy, both end voltage also remains unchanged.
(2) t
2Constantly, the switching tube S1 conducting of former limit is turned off, and to parasitic capacitance C1 charging, because magnetizing inductance Lm is bigger, former limit switching tube S1 drain-source both end voltage Vds approximately linear rises the resonant inductance electric current with resonance manner.
(3) t
3Constantly, Vds rises to Vi+Vc, and the energy among the leakage inductance Lr stores among the clamp capacitor Cr by the body diode of auxiliary switch S2 at this moment.The voltage linear at clamp capacitor Cr two ends rises.
(4) t
4Constantly, the energy among the leakage inductance Lr is all absorbed by clamp capacitor Cr, and the voltage at Cr two ends rises to a stable value, and the voltage threshold less than setting remains unchanged.Primary current Ip drops to zero.The energy of magnetizing inductance Lm storage is released to outlet side, and Ilm is linear to descend, output rectifier diode D conducting.
(5) t
5Constantly, if the energy that clamp capacitor Cr absorbs has reached threshold value, then directly enter t
6Constantly.If do not have, then circuit repeats the action in last cycle.Because the leakage inductance energy that last one-period is stored among the clamp capacitor Cr does not discharge, so clamp capacitor Cr energy increases on the basis of last one-period once more, the voltage at clamp capacitor Cr two ends also rises to a stationary value once more.Through the time in several cycles, the voltage at clamp capacitor Cr two ends can present a stair-stepping growth.
(6) t
6Constantly, the voltage at clamp capacitor Cr two ends has reached threshold voltage, and by divider resistance with voltage Vr and Vref relatively, auxiliary switch S2 is by open-minded, clamp capacitor Cr and leakage inductance Lr resonance, and clamp capacitor Cr discharges immediately.Energy part among the Cr is discharged into output by transformer, and a part stores in the leakage inductance.t
7Primary current Ip discharges into maximum, oppositely increases subsequently.
(7) t
8Constantly, auxiliary switch S2 is turned off, leakage inductance Lr and parasitic capacitance C1 resonance.Parasitic capacitance C1 discharge, Vds descends.
(8) t
9Constantly, former limit switching tube S1 drain-source both end voltage Vds drops to zero.In order to prevent the common of S1 and S2, this moment, S1 still was in off state.When the next cycle arrived, former limit switching tube S1 is open-minded, and this moment, S1 realized that no-voltage is open-minded.
Claims (3)
1. the control method of an active clamp anti exciting converter auxiliary switch S2, it is characterized in that: former limit each cycle of switching tube S1 is all open-minded, and auxiliary switch S2 then controls by voltage threshold control circuit 1.When former limit switching tube S1 turn-offs, leakage inductance energy absorbs for clamp capacitor Cr by the diode D2 in the active clamp circuit, by setting reference voltage V ref, when passing through voltage Vr that electric resistance partial pressure obtains and surpass reference voltage V ref on the capacitor C r, open auxiliary switch S2.
2. the control method of the described a kind of active clamp anti exciting converter auxiliary switch S2 of claim 1, its voltage threshold control circuit 1 is characterised in that an end of resistance R 1 is connected with the drain electrode of auxiliary switch S2, the other end of resistance R 1 links to each other with resistance R 2.Obtain voltage Vr by resistance R 1 and R2 dividing potential drop, voltage Vr is connected with the in-phase end of comparator 1, and reference voltage V ref is connected with the end of oppisite phase of comparator 1.The output of comparator 1 directly is connected with the grid of auxiliary switch S2 or amplifies the back through amplifying circuit and is connected with the grid of auxiliary switch S2.
3. the control method of claims 1 and claims 2 described a kind of active clamp anti exciting converter auxiliary switch S2, its voltage threshold control circuit 2 is characterised in that, the output of comparator 1 links to each other with the R end of SR latch 1, the S of SR latch 1 end links to each other with a drive signal Vpulse, drive signal Vpulse high level must former limit switching tube S1 open signal comes before be provided with.The output Q ' of SR latch 1 directly is connected with the grid of auxiliary switch S2 or amplifies the back through amplifying circuit and is connected with the grid of auxiliary switch S2.Used a SR latch that constitutes by XOR gate in the control circuit.The wherein characteristic of SR latch such as following table:
This SR latch can be made of XOR gate, also can be made of NAND gate.
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| CN201010502461.0A CN102122890B (en) | 2010-10-11 | 2010-10-11 | Control method for auxiliary switching tube of active clamp flyback converter |
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| CN201010502461.0A CN102122890B (en) | 2010-10-11 | 2010-10-11 | Control method for auxiliary switching tube of active clamp flyback converter |
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| CN102122890B CN102122890B (en) | 2014-01-22 |
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| CN103825468A (en) * | 2013-02-18 | 2014-05-28 | 崇贸科技股份有限公司 | Control circuit of flyback power converter |
| CN103887986A (en) * | 2013-04-15 | 2014-06-25 | 崇贸科技股份有限公司 | Control Circuit Of Flyback Type Power Converter Time Predictive Control |
| CN104300795A (en) * | 2014-10-11 | 2015-01-21 | 广州金升阳科技有限公司 | Flyback converter and control method of flyback converter |
| CN106100352A (en) * | 2016-08-05 | 2016-11-09 | 广州金升阳科技有限公司 | Flyback control circuit and control method |
| TWI560537B (en) * | 2013-10-04 | 2016-12-01 | Leadtrend Tech Corp | Controller for adjusting an output voltage of a power converter |
| CN106533175A (en) * | 2015-09-11 | 2017-03-22 | 亚荣源科技（深圳）有限公司 | Retracing type power converter |
| WO2017128695A1 (en) * | 2016-01-29 | 2017-08-03 | 深圳嘉润茂电子有限公司 | Zero-voltage quasi-resonant boost circuit |
| CN107017780A (en) * | 2017-05-31 | 2017-08-04 | 青岛大学 | The isolated form DC DC booster converters and its control method of a kind of band pull-up active clamp branch road |
| CN107017779A (en) * | 2017-05-31 | 2017-08-04 | 青岛大学 | A kind of band pulls down the isolated form DC DC booster converter control methods of active clamp branch road |
| CN107196515A (en) * | 2017-06-30 | 2017-09-22 | 广州金升阳科技有限公司 | A kind of active clamp positive activation type switching power circuit |
| CN107276414A (en) * | 2017-06-30 | 2017-10-20 | 广州金升阳科技有限公司 | A kind of active clamp inverse-excitation type switch power-supply circuit |
| CN107294388A (en) * | 2017-06-30 | 2017-10-24 | 广州金升阳科技有限公司 | A kind of inverse-excitation type switch power-supply |
| CN107395018A (en) * | 2017-06-30 | 2017-11-24 | 广州金升阳科技有限公司 | A kind of positive exciting switching voltage regulator |
| CN108923661A (en) * | 2018-09-19 | 2018-11-30 | 重庆线易电子科技有限责任公司 | Electric power converter |
| CN109245569A (en) * | 2018-09-18 | 2019-01-18 | 西安矽力杰半导体技术有限公司 | Inverse excitation type converter and its control circuit |
| WO2019024907A1 (en) * | 2017-08-03 | 2019-02-07 | Huawei Technologies Co., Ltd. | Auxiliary power supply apparatus and method |
| CN109546849A (en) * | 2019-01-10 | 2019-03-29 | 北京新雷能科技股份有限公司 | Flyback converter active clamp circuit |
| CN110112917A (en) * | 2019-04-15 | 2019-08-09 | 西安矽力杰半导体技术有限公司 | Control circuit and the active clamping circuir for applying it |
| CN110677045A (en) * | 2019-09-20 | 2020-01-10 | 广州金升阳科技有限公司 | Control method of active clamp flyback converter |
| CN111030479A (en) * | 2018-10-09 | 2020-04-17 | 通嘉科技股份有限公司 | Active clamp flyback power converter and related control method |
| CN113078825A (en) * | 2021-05-20 | 2021-07-06 | 国网湖南省电力有限公司 | Switching tube resonant circuit capable of improving efficiency of flyback power supply and flyback power supply |
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| CN109245569B (en) * | 2018-09-18 | 2020-04-24 | 西安矽力杰半导体技术有限公司 | Flyback converter and control circuit thereof |
| CN109245569A (en) * | 2018-09-18 | 2019-01-18 | 西安矽力杰半导体技术有限公司 | Inverse excitation type converter and its control circuit |
| CN108923661B (en) * | 2018-09-19 | 2024-04-16 | 深圳线易微电子有限公司 | Power converter |
| CN108923661A (en) * | 2018-09-19 | 2018-11-30 | 重庆线易电子科技有限责任公司 | Electric power converter |
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| CN110677045A (en) * | 2019-09-20 | 2020-01-10 | 广州金升阳科技有限公司 | Control method of active clamp flyback converter |
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| CN114189160B (en) * | 2021-12-07 | 2023-12-12 | 南京微盟电子有限公司 | Light-load conduction control method and circuit for clamping tube in active clamping flyback topology |
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| CN102122890B (en) | 2014-01-22 |
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Inventor after: Liu Shuo Inventor after: Zhang Fanghua Inventor after: Xiao Xu Inventor after: Hu Zhijun Inventor after: Zhu Dan Inventor before: Liu Shuo Inventor before: Ni Jianjun Inventor before: Zhang Fanghua |
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