CN204258617U - A kind of circuit structure solving flyback type of switch source-drain sense problem - Google Patents
A kind of circuit structure solving flyback type of switch source-drain sense problem Download PDFInfo
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- CN204258617U CN204258617U CN201420848194.6U CN201420848194U CN204258617U CN 204258617 U CN204258617 U CN 204258617U CN 201420848194 U CN201420848194 U CN 201420848194U CN 204258617 U CN204258617 U CN 204258617U
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Abstract
The utility model relates to a kind of circuit structure solving flyback type of switch source-drain sense problem, belongs to electronic circuit technology field.Technical scheme is: after converter former limit inductance (Lm) and transformer (B) parallel connection of primary windings, Tandem converler leakage inductance (Lr) forms branch road one, high voltage release electric capacity (C1) is connected with auxiliary switching transistor (S2) of releasing and is formed branch road two, and branch road one is connected in series main switching transistor (S1) with after branch road two parallel connection; It is in parallel with output filter capacitor (C2) afterwards that transformer (B) secondary coil exports serial connection output rectifier diode (D1), and the trigger impulse direction of described main switching transistor (S1) and auxiliary switching transistor (S2) of releasing is contrary.The beneficial effects of the utility model are: reduce main switching transistor drain terminal voltage instantaneously, protective transistor, can recycle line electrical leakage inducing current, improve power work efficiency.
Description
Technical field
The utility model relates to a kind of circuit structure solving flyback type of switch source-drain sense problem, belongs to electronic circuit technology field.
Background technology
At present, inverse-excitation type switch power-supply is widely used in daily life and industrial production, method for designing both at home and abroad for inverse-excitation type switch power-supply is also very many with commentary, object is nothing but more stable in order to obtain work, electromagnetic interference and Electro Magnetic Compatibility are better, the power supply that efficiency is higher, and by extensive use and constantly practice, people have summed up a series of convenient design, and these designs constantly transform the basis with optimal design by becoming people.Wherein, for inverse-excitation type switch power-supply, people are in order to make its volume less, and reaction is rapider, constantly attempts increase switching frequency, but side effect bring be the increase in switching loss and electromagnetic interference problem, power-efficient also declines thereupon.In solution electromagnetic interference problem, switching transistor drain electrode high peak voltage problem is a particularly important ring, and switching frequency is higher, and this peak voltage is higher, this due to anti exciting converter former limit inductance with there is leakage inductance and cause.The switching transistor down periods, energy conducts to load by secondary coil, and primary coil, owing to there is freewheel current and circuit leakage inductance electric current, can produce very high voltage in the switching transistor drain electrode closed.If do not take braking measure to this high voltage, its very possible breakdown switch transistor, makes device damage, or produces high voltage spike to peripheral devices formation conductibility and radiativity interference, and make peripheral devices cisco unity malfunction, this is all unallowed.The way of background technology drains at switching tube; the former limit of inverse excitation type converter also connects RCD absorption circuit; the high voltage that each switching transistor turn-off transient is produced is released by resistance capacitance; protection rear class transistor is not damaged; but; this way makes power supply part energy be lost on absorption resistance, makes power supply reduce efficiency in overall.
Utility model content
The utility model object is to provide a kind of circuit structure solving flyback type of switch source-drain sense problem; effectively reduce switching tube drain electrode overvoltage; protection switch transistor well; the energy formed due to afterflow and leakage inductance can be returned to mains side simultaneously; power-efficient promotes as a whole, solves the problems referred to above that background technology exists.
The technical solution of the utility model is: a kind of circuit structure solving flyback type of switch source-drain sense problem, comprises converter leakage inductance, converter former limit inductance, high voltage release electric capacity, exports rectifier diode, output filter capacitor, main switching transistor, auxiliary release switching transistor and transformer.
After converter former limit inductance is in parallel with transformer, Tandem converler leakage inductance forms branch road one, and high voltage release electric capacity is connected with auxiliary switching transistor of releasing and formed branch road two, and branch road one is connected in series main switching transistor with after branch road two parallel connection.
Transformer secondary coil is in parallel with output filter capacitor after exporting serial connection output rectifier diode.
The trigger impulse direction of described main switching transistor and auxiliary switching transistor of releasing is contrary.
When main switching transistor is in Ton moment, auxiliary switching transistor of releasing is in Toff state, power supply is to converter former limit charging, and electric energy conversion is that magnetic energy stores, when main switching transistor is in Toff state, auxiliary switching transistor of releasing is in Ton state, major part energy transferring is to secondary supply load, and minority freewheel current and leakage inductance electric current are through reversal connection electric capacity feedback power, and such converter did not both have heat-dissipating, do not have energy loss again, work conversion efficiency improves.
The utility model removes the electric RCD(resistance, electric capacity, the diode that absorb filtering in background technology for high voltage), change the mode that a kind of electric capacity reversal connection is connected with switching transistor into, be incorporated to converter primary coil place, when causing high voltage when main switching transistor closedown, auxiliary release switching transistor conducting by the energy conduction higher than supply voltage to mains side, realize the feedback of energy.
The beneficial effects of the utility model are: reduce main switching transistor drain terminal voltage instantaneously, protective transistor, can recycle line electrical leakage inducing current, improve power work efficiency.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
In figure: the former limit inductance L m of converter leakage inductance Lr, converter, high voltage release electric capacity C1, output rectifier diode D1, output filter capacitor C2, main switching transistor S1, auxiliary release switching transistor S2, transformer B.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the utility model is described in further detail.
Solve a circuit structure for flyback type of switch source-drain sense problem, comprise converter leakage inductance Lr, the former limit inductance L m of converter, high voltage release electric capacity C1, export rectifier diode D1, output filter capacitor C2, main switching transistor S1, the auxiliary switching transistor S2 and transformer B that releases.
After the former limit inductance L m of converter and transformer B parallel connection of primary windings, Tandem converler leakage inductance Lr forms branch road one, high voltage release electric capacity C1 connects with the auxiliary switching transistor S2 that releases and forms branch road two, is connected in series main switching transistor S1 after branch road one is in parallel with branch road two.
Transformer B secondary coil is in parallel with output filter capacitor C2 after exporting serial connection output rectifier diode D1.
The trigger impulse direction of described main switching transistor S1 and the auxiliary switching transistor S2 that releases is contrary.
The control end of main switching transistor S1 directly connects pulse generator, and the control end of the auxiliary switching transistor S2 that releases connects pulse generator by inverter.
When main switching transistor S1 is in Ton moment, the auxiliary switching transistor S2 that releases is in Toff state, power supply is to converter former limit charging, and electric energy conversion is that magnetic energy stores, when main switching transistor S1 is in Toff state, the auxiliary switching transistor S2 that releases is in Ton state, major part energy transferring is to secondary supply load, and minority freewheel current and leakage inductance electric current are through reversal connection electric capacity feedback power, and such converter did not both have heat-dissipating, whether have energy loss again, work conversion efficiency improves.
Converter high pressure peak absorbing loop of the present utility model, adopt be switch type transistor play a reversed role electric capacity realize, in addition converter main switching transistor, this circuit has needs two transistors altogether, two transistors need diametrically opposite trigger impulse, this needs a slice PWM(pulse-width modulator) control chip, as UC3845, contrary pulse can be obtained by inverter, the electric capacity being responsible for energy feedback needs withstand voltage higher than supply voltage more than 2 times, PCB configuration carries out layout according to minimum electromagnetic interference mode, namely this circuit can be applicable in any inverse excitation type converter, theoretical and actual measurement all can reach the object of expection.
Claims (2)
1. solve a circuit structure for flyback type of switch source-drain sense problem, it is characterized in that: comprise converter leakage inductance (Lr), converter former limit inductance (Lm), high voltage release electric capacity (C1), output rectifier diode (D1), output filter capacitor (C2), main switching transistor (S1), auxiliary release switching transistor (S2) and transformer (B);
After converter former limit inductance (Lm) and transformer (B) parallel connection of primary windings, Tandem converler leakage inductance (Lr) forms branch road one, high voltage release electric capacity (C1) is connected with auxiliary switching transistor (S2) of releasing and is formed branch road two, and branch road one is connected in series main switching transistor (S1) with after branch road two parallel connection;
It is in parallel with output filter capacitor (C2) afterwards that transformer (B) secondary coil exports serial connection output rectifier diode (D1).
2. a kind of circuit structure solving flyback type of switch source-drain sense problem according to claim 1, is characterized in that: the trigger impulse direction of described main switching transistor (S1) and auxiliary switching transistor (S2) of releasing is contrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420848194.6U CN204258617U (en) | 2014-12-29 | 2014-12-29 | A kind of circuit structure solving flyback type of switch source-drain sense problem |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420848194.6U CN204258617U (en) | 2014-12-29 | 2014-12-29 | A kind of circuit structure solving flyback type of switch source-drain sense problem |
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| CN204258617U true CN204258617U (en) | 2015-04-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743354A (en) * | 2016-04-20 | 2016-07-06 | 华北电力大学（保定） | Laser drive circuit of single-ended flyback circuit |
| CN106899219A (en) * | 2015-12-18 | 2017-06-27 | 虹冠电子工业股份有限公司 | For the power converter and its mode of operation of Switching Power Supply |
| CN107567150A (en) * | 2017-10-10 | 2018-01-09 | 矽力杰半导体技术(杭州)有限公司 | Input power sense circuit and detection method and include its LED drive 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 |
-
2014
- 2014-12-29 CN CN201420848194.6U patent/CN204258617U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899219A (en) * | 2015-12-18 | 2017-06-27 | 虹冠电子工业股份有限公司 | For the power converter and its mode of operation of Switching Power Supply |
| CN106899219B (en) * | 2015-12-18 | 2020-07-28 | 虹冠电子工业股份有限公司 | Power converter for switching power supply and operation mode thereof |
| CN105743354A (en) * | 2016-04-20 | 2016-07-06 | 华北电力大学（保定） | Laser drive circuit of single-ended flyback circuit |
| CN107567150A (en) * | 2017-10-10 | 2018-01-09 | 矽力杰半导体技术(杭州)有限公司 | Input power sense circuit and detection method and include its LED drive circuit |
| CN107567150B (en) * | 2017-10-10 | 2019-06-14 | 矽力杰半导体技术(杭州)有限公司 | Input power sense circuit and detection method and the LED drive circuit comprising it |
| 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 |
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