CN204145284U - A kind of circuit reducing switch tube voltage stress - Google Patents
A kind of circuit reducing switch tube voltage stress Download PDFInfo
- Publication number
- CN204145284U CN204145284U CN201420463488.7U CN201420463488U CN204145284U CN 204145284 U CN204145284 U CN 204145284U CN 201420463488 U CN201420463488 U CN 201420463488U CN 204145284 U CN204145284 U CN 204145284U
- Authority
- CN
- China
- Prior art keywords
- diode
- alternate path
- same way
- switching tube
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of circuit reducing switch tube voltage stress.In the circuit, the two ends of the primary coil of transformer RCD buffer circuit in parallel; RCD buffer circuit comprises alternate path and the diode alternate path in the same way of resistance and electric capacity; Resistance is connected one end of primary coil with alternate path one end of electric capacity, and the other end connects the negative electrode of diode alternate path in the same way; The anode of diode alternate path in the same way connects the other end of primary coil and the drain electrode of switching tube; The source ground of switching tube, contact resistance between grid and source electrode; Transformer secondary coil one end connects the anode of diode, other end ground connection; The negative electrode of diode, for exporting, passes through the first capacity earth simultaneously.Under can realizing the same electric pressure of power supply by the utility model, switch tube voltage stress is minimum, ensures that switching tube long-term safety works reliably.
Description
Technical field
The utility model relates to a kind of circuit reducing switch tube voltage stress, belongs to switch power technology field.
Background technology
Along with the fast development of LED drive power, the protection etc. of particular product performance parameters, product reliability design, Primary Component causes the great attention of numerous producer.These producers drop into and more research and develop energy, and achieve significant progress.Due to continuing to bring out of new technology, make market competition day by day to specialized, highly reliable, high-level future development.
Under Switching Power Supply is usually operated at high frequency state, therefore the impact of the parasitic parameter such as switch transformer leakage inductance, distributed capacitance can not be ignored.In switch transition moment, the energy charge and discharge of reactance component causes power device to bear very large electric stress, and forms overvoltage.This not only means that designer must select expensive high Breakdown Voltage Power switching tube, brings potential threat also to the reliability of power supply simultaneously.Therefore how suppressing the overvoltage of switch transition, reduce the voltage stress of switching tube, is the important technological problems that field of switch power needs to solve.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved in the utility model is to provide a kind of circuit reducing switch tube voltage stress.
For achieving the above object, the utility model adopts following technical scheme:
Reduce a circuit for switch tube voltage stress, comprise transformer, RCD buffer circuit, diode, switching tube, resistance and electric capacity;
The two ends RCD buffer circuit in parallel of the primary coil of described transformer;
Described RCD buffer circuit comprises alternate path and the diode alternate path in the same way of resistance and electric capacity; Described resistance is connected one end of primary coil with alternate path one end of electric capacity, and the other end connects the negative electrode of described diode alternate path in the same way; The anode of described diode alternate path in the same way connects the other end of described primary coil and the drain electrode of described switching tube;
The source ground of described switching tube, contact resistance between grid and source electrode;
Described transformer secondary coil one end connects the anode of diode, other end ground connection; The negative electrode of described diode, for exporting, passes through capacity earth simultaneously.
Wherein more preferably, described diode in the same way alternate path comprise at least two diodes.
Wherein more preferably, the source electrode of described switching tube is by two parallel resistance ground connection.
Wherein more preferably, the diode of described diode in the same way in alternate path is model of the same race.
The circuit of reduction switch tube voltage stress provided by the utility model can make power supply under same electric pressure, and switch tube voltage stress is minimum, ensures switching tube long-term safety reliably working.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the first embodiment of the present utility model;
Fig. 2 is the circuit theory diagrams of the second embodiment of the present utility model;
Fig. 3 is the circuit theory diagrams of the 3rd embodiment of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
See Fig. 1, the circuit of reduction switch tube voltage stress provided by the utility model comprises transformer, RCD buffer circuit, diode, switching tube, resistance and electric capacity.The two ends RCD buffer circuit in parallel of the primary coil of transformer T1, comprises resistance R1, electric capacity C1 and fast recovery diode V2, V3.Wherein, the voltage input end of resistance R1 and electric capacity C1 alternate path one termination primary coil, the other end connects the negative electrode of diode V2, V3 alternate path in the same way respectively.The other end of the anode of alternate path in the same way connection transformer T1 primary coil of diode V2, V3 and the drain electrode of switching tube V5.The grid of switching tube V5 is connected with control circuit by resistance R2, contact resistance R3 between grid and source electrode, and source electrode is by the alternate path ground connection of resistance R4, R5.One end of transformer T1 secondary coil connects the anode of diode V1A, V1B, other end ground connection respectively.The negative electrode of diode V1A, V1B is output voltage, simultaneously by electric capacity C2 ground connection.
In the above-described embodiments, the diode in RCD buffer circuit in the same way alternate path adopts two fast recovery diodes V2, V3.In actual applications, alternate path can also multiple fast recovery diode in parallel in the same way in the same way for diode.In two embodiments as shown in Figures 2 and 3, diode alternate path and four fast recovery diode parallel connections in parallel by three fast recovery diodes respectively in the same way.Diode in parallel needs to adopt model of the same race.It should be noted that, diode in parallel is not that quantity is more, and the voltage stress of switching tube is less, and its needs control in certain scope.
When switching tube conducting, input voltage is added on transformer T1 winding.Due to the on-off action of switching tube, the inductive current in transformer T1 followed by switch and converts.When switching tube turns off, inductive current converts suddenly, and T1 is upper can produce high peaking voltage, causes metal-oxide-semiconductor to bear voltage in the moment turned off very high.Due to diode in the same way alternate path adopt the form of multiple fast recovery diode parallel connection, effectively can improve the reverse recovery time of diode relative to single diode, after making electric capacity C1 voltage increase rapidly and by clamp.And after switching tube connection, resistance R1 starts electric discharge, the voltage of electric capacity C1 is back to original value, and unnecessary energy is by resistance consumption.Such RCD buffer circuit absorbs peak voltage rapidly, makes peak voltage be unlikely to damage switching tube.
RCD buffer circuit in the utility model can absorbing peak pulse voltage fast, thus effectively reduce the voltage stress of switching tube.By adopting circuit provided by the utility model, the switching tube with lower withstand voltage properties can be selected.Conducting internal resistance reduction, the loss of switching tube reduce, and effectively can improve product efficiency.Therefore the utility model not only reduces the cost of product, also assures that the reliability of switching tube simultaneously.
Above the circuit of reduction switch tube voltage stress provided by the utility model is described in detail.To those skilled in the art, to any apparent change that it does under the prerequisite not deviating from the utility model connotation, all by formation to the utility model infringement of patent right, corresponding legal liabilities will be born.
Claims (4)
1. reduce a circuit for switch tube voltage stress, it is characterized in that comprising transformer, RCD buffer circuit, diode, switching tube, resistance and electric capacity;
The two ends RCD buffer circuit in parallel of the primary coil of described transformer;
Described RCD buffer circuit comprises alternate path and the diode alternate path in the same way of resistance and electric capacity; Described resistance is connected one end of primary coil with alternate path one end of electric capacity, and the other end connects the negative electrode of described diode alternate path in the same way; The anode of described diode alternate path in the same way connects the other end of described primary coil and the drain electrode of described switching tube;
The source ground of described switching tube, contact resistance between grid and source electrode;
Described transformer secondary coil one end connects the anode of diode, other end ground connection; The negative electrode of described diode, for exporting, passes through capacity earth simultaneously.
2. the circuit reducing switch tube voltage stress as claimed in claim 1, is characterized in that:
Described diode in the same way alternate path comprises at least two diodes.
3. the circuit reducing switch tube voltage stress as claimed in claim 1, is characterized in that:
The source electrode of described switching tube is by two parallel resistance ground connection.
4. the circuit reducing switch tube voltage stress as claimed in claim 1, is characterized in that:
The diode of described diode in the same way in alternate path is model of the same race.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420463488.7U CN204145284U (en) | 2014-08-15 | 2014-08-15 | A kind of circuit reducing switch tube voltage stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420463488.7U CN204145284U (en) | 2014-08-15 | 2014-08-15 | A kind of circuit reducing switch tube voltage stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204145284U true CN204145284U (en) | 2015-02-04 |
Family
ID=52421948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420463488.7U Expired - Fee Related CN204145284U (en) | 2014-08-15 | 2014-08-15 | A kind of circuit reducing switch tube voltage stress |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204145284U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233718A (en) * | 2018-01-29 | 2018-06-29 | 新日(无锡)发展有限公司 | A kind of inverse-excitation type switch power-supply for accumulator |
-
2014
- 2014-08-15 CN CN201420463488.7U patent/CN204145284U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233718A (en) * | 2018-01-29 | 2018-06-29 | 新日(无锡)发展有限公司 | A kind of inverse-excitation type switch power-supply for accumulator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102026448A (en) | LED power circuit | |
| CN203278782U (en) | Drive and protection circuit of high-frequency low-power MOSFET | |
| CN202840965U (en) | Power supply conversion device with control switch | |
| CN203537225U (en) | Novel antisurge constant-current switching power supply | |
| CN103049028B (en) | Constant current source for high voltage magnetic switch resetting | |
| CN202309502U (en) | Switching power supply circuit capable of absorbing inverse voltage peak | |
| CN204046411U (en) | Be applicable to single normal shock absorbing circuit of middle low power modular power source | |
| CN103347329B (en) | LED driving circuit | |
| CN204258617U (en) | A kind of circuit structure solving flyback type of switch source-drain sense problem | |
| CN204145284U (en) | A kind of circuit reducing switch tube voltage stress | |
| CN203219266U (en) | High-voltage series MOS tube drive circuit | |
| CN205596011U (en) | Peak snubber circuit and switching power supply | |
| CN203966976U (en) | A kind of direct current relay drive circuit | |
| CN203590550U (en) | Large-power LED lamp realized by adopting voltage-isolated fly-back controller | |
| CN103066850B (en) | Isolated booster circuit, backlight module and liquid crystal indicator | |
| CN102684167B (en) | Power supply power-fail recoil protective circuit | |
| CN102123535A (en) | Novel LED backlight boosted circuit | |
| CN103347330B (en) | LED driving control circuit | |
| CN203352883U (en) | A LED driving and controlling circuit | |
| CN205407592U (en) | No -voltage quasi -resonance boost circuit | |
| CN103369764B (en) | A LED driving circuit and a LED lamp | |
| CN201975988U (en) | Intrinsic safety power supply spark suppression circuit for mine | |
| CN201590792U (en) | Compulsory turn-off triggering device of high-voltage soft-start thyristor | |
| CN203027129U (en) | RCD (Residual Current Device) circuit for reducing voltage stress of switching power supply MOS (Metal Oxide Semiconductor) tube | |
| CN203617897U (en) | Protection and snubber circuit for power switch tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Circuit for reducing voltage stress of switch tube Effective date of registration: 20150618 Granted publication date: 20150204 Pledgee: Beijing technology business factoring Ltd. Pledgor: Beijing Tonlier Energy-saving LLC. Registration number: 2015990000483 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20170815 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |