CN206595887U - A kind of switching mode power supply transformer isolated drive circuit - Google Patents
A kind of switching mode power supply transformer isolated drive circuit Download PDFInfo
- Publication number
- CN206595887U CN206595887U CN201720349313.7U CN201720349313U CN206595887U CN 206595887 U CN206595887 U CN 206595887U CN 201720349313 U CN201720349313 U CN 201720349313U CN 206595887 U CN206595887 U CN 206595887U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- power switch
- switching mode
- switch pipe
- 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
Abstract
The utility model belongs to power circuit technical field, and in particular to a kind of switching mode power supply transformer isolated drive circuit.The switching mode power supply transformer isolated drive circuit, including control circuit, driving chip, isolating transformer and bootstrap capacitor；The driving chip is connected with control circuit, isolating transformer primary side is connected with capacitance, control to be provided with current-limiting resistance between circuit and primary side capacitance, the isolating transformer secondary is connected with bootstrap capacitor, switching tube is connected between bootstrap capacitor and power switch pipe and opens loop, the power switch pipe is connected with turn-off circuit and negative pressure circuit.Its advantage is：Isolating transformer secondary bootstrap capacitor ensures that its circuit output signal amplitude does not change with control end change in duty cycle；Possess " opening fast shut-off slowly " characteristic, noise and its turn-off power loss is reduced when can reduce power switch pipe work；Ensure the reliability of power switch pipe work.
Description
Technical field
The utility model belongs to power circuit technical field, and in particular to a kind of switching mode power supply transformer isolation drive electricity
Road.
Background technology
With the development of society, Switching Power Supply application is more and more extensive, its Primary Component power switch pipe is operated in high frequency
Under high pressure conditions.Due to circuit topology in itself the need for or consideration based on secure context, it is necessary to by from control circuit
Drive signal is isolated with power switch, because its isolation voltage grade is high, circuit is set by the way of transformer Magnetic isolation
Meter is simple, the low factor of cost is applied more and more extensively in Switching Power Supply design, and traditional transformer isolated drive circuit, bag
The control circuit for producing driving pulse, driving chip, transformer primary side capacitance, isolating transformer, driving resistance are included, works as control
When the pulse signal that circuit processed is produced passes through this circuit, due to the presence of transformer primary side capacitance, circuit Vg1 and Vs1 will
Driving voltage just lower negative is used for driving power switching tube in generation, but the driving voltage central point by with pulse signal
Dutycycle increase and gradually move down, when dutycycle is sufficiently large, power switch pipe will be unable to it is open-minded, therefore this circuit be not suitable for should
Used in the occasion that driving pulse dutycycle is larger, and the tradition isolation provided with transformer secondary bootstrap capacitor and bootstrap diode
Transformer drive circuit, when the pulse signal for controlling circuit to produce passes through this circuit, due to primary side capacitance and secondary
In generation just lower zero driving voltage is used for driving power switching tube, the circuit by the presence of bootstrap capacitor, circuit Vg1 and Vs1
The problem of central point that overcome increases driving voltage with the dutycycle of input pulse signal is moved down, but due to power switch pipe
Zero voltage turn-off, when there is electromagnetic interference, power switch pipe easily misleads, so as to reduce the reliable of switch power supply system
Property.
Utility model content
The utility model is electric there is provided a kind of switching mode power supply transformer isolation drive for the defect for making up prior art
Road.
The utility model is achieved by the following technical solution：
A kind of switching mode power supply transformer isolated drive circuit, including control circuit, driving chip, isolating transformer and bootstrapping
Electric capacity；The driving chip be connected with control circuit, and isolating transformer primary side is connected with capacitance, control circuit and primary side every
Current-limiting resistance is provided between straight electric capacity, the isolating transformer secondary is connected with bootstrap capacitor, bootstrap capacitor and power switch pipe
Between be connected with switching tube and open loop, the power switch pipe is connected with turn-off circuit and negative pressure circuit.
Further, the turn-off circuit includes p-type triode, and its colelctor electrode connects with negative pressure circuit voltage-regulator diode anode
Connect, emitter stage connects the grid of power switch pipe, base stage connects bootstrap capacitor one end via current-limiting resistance.
Further, the loop of opening includes driving resistance, driving resistance one end and poses as capacitance connection, other end with
Drive the anode connection of diode.
Further, described driving diode anode connection driving resistance one end, the other end connects the grid of power switch pipe.
Further, described current-limiting resistance one end connection bootstrap capacitor one end, other end connection p-type transistor base.
Further, the voltage-regulator diode of the negative pressure circuit, anode connection p-type transistor collector, negative electrode connection power
Switch tube source grade.
Further, one end connection voltage-regulator diode anode of the shunt capacitance, other end connection voltage-regulator diode negative electrode.
The beneficial effects of the utility model are：1st, isolating transformer secondary bootstrap capacitor ensures its circuit output signal amplitude
Do not change with control end change in duty cycle；
2nd, transformer primary side current-limiting resistance and capacitance can effectively prevent isolating transformer in power-up moment and normal
Enter saturation state during work；
3rd, possess " opening fast shut-off slowly " characteristic, noise and its turn-off power loss is reduced when can reduce power switch pipe work；
4th, power switch pipe negative pressure is turned off and negative pressure is adjustable, it is ensured that the reliability of power switch pipe work；
5th, the present invention is not limited to two-way driving, can carry out list by increasing or decreasing isolating transformer vice-side winding number
Road or multichannel driving.
Brief description of the drawings
The utility model is further described below in conjunction with the accompanying drawings.
Accompanying drawing 1 is dual path isolation drive circuit figure of the present utility model；
Accompanying drawing 2 is the utility model outputting drive voltage waveform under input pulse different duty.
Embodiment
Accompanying drawing 1,2 is a kind of specific embodiment of the present utility model.A kind of switching mode power supply transformer isolation of the utility model
Drive circuit, including control circuit, driving chip, isolating transformer and bootstrap capacitor；The driving chip connects with control circuit
Connect, isolating transformer primary side is connected with capacitance, be provided with current-limiting resistance between control circuit and primary side capacitance, it is described every
Bootstrap capacitor is connected with from transformer secondary, switching tube is connected between bootstrap capacitor and power switch pipe and opens loop, it is described
Power switch pipe is connected with turn-off circuit and negative pressure circuit.
Further, the turn-off circuit includes p-type triode, and its colelctor electrode connects with negative pressure circuit voltage-regulator diode anode
Connect, emitter stage connects the grid of power switch pipe, base stage connects bootstrap capacitor one end via current-limiting resistance.
Further, the loop of opening includes driving resistance, driving resistance one end and poses as capacitance connection, other end with
Drive the anode connection of diode.
Further, described driving diode anode connection driving resistance one end, the other end connects the grid of power switch pipe.
Further, described current-limiting resistance one end connection bootstrap capacitor one end, other end connection p-type transistor base.
Further, the voltage-regulator diode of the negative pressure circuit, anode connection p-type transistor collector, negative electrode connection power
Switch tube source grade.
Further, one end connection voltage-regulator diode anode of the shunt capacitance, other end connection voltage-regulator diode negative electrode.
The utility model is not limited to above-mentioned embodiment, and anyone should learn what is made under enlightenment of the present utility model
There is same or like technical scheme with the utility model, each fall within protection domain of the present utility model.
Technology that the utility model is not described in detail, shape, construction part are known technology.
Claims (6)
1. a kind of switching mode power supply transformer isolated drive circuit, including control circuit, driving chip, isolating transformer and bootstrapping electricity
Hold；Characterized in that, the driving chip is connected with control circuit, isolating transformer primary side is connected with capacitance, control electricity
Current-limiting resistance is provided between road and primary side capacitance, the isolating transformer secondary is connected with bootstrap capacitor, bootstrap capacitor with
Switching tube is connected between power switch pipe and opens loop, the power switch pipe is connected with turn-off circuit and negative pressure circuit.
2. a kind of switching mode power supply transformer isolated drive circuit according to claim 1, it is characterized in that：The turn-off circuit
Including p-type triode, its colelctor electrode is connected with negative pressure circuit voltage-regulator diode anode, and emitter stage connects the grid of power switch pipe
Pole, base stage connects bootstrap capacitor one end via current-limiting resistance.
3. a kind of switching mode power supply transformer isolated drive circuit according to claim 1, it is characterized in that：It is described to open loop
Including driving resistance, driving resistance one end is with posing as capacitance connection, and other end is with driving the anode of diode to be connected.
4. a kind of switching mode power supply transformer isolated drive circuit according to claim 3, it is characterized in that：Two poles of the driving
Tube anode connection driving resistance one end, the other end connects the grid of power switch pipe.
5. a kind of switching mode power supply transformer isolated drive circuit according to claim 1, it is characterized in that：The current-limiting resistance
One end connection bootstrap capacitor one end, other end connection p-type transistor base.
6. a kind of switching mode power supply transformer isolated drive circuit according to claim 1 or 2, it is characterized in that：The negative pressure
The voltage-regulator diode of circuit, anode connection p-type transistor collector, negative electrode connection power switch tube source grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720349313.7U CN206595887U (en) | 2017-04-05 | 2017-04-05 | A kind of switching mode power supply transformer isolated drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720349313.7U CN206595887U (en) | 2017-04-05 | 2017-04-05 | A kind of switching mode power supply transformer isolated drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206595887U true CN206595887U (en) | 2017-10-27 |
Family
ID=60120809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720349313.7U Expired - Fee Related CN206595887U (en) | 2017-04-05 | 2017-04-05 | A kind of switching mode power supply transformer isolated drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206595887U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149947A (en) * | 2018-09-29 | 2019-01-04 | 北京机械设备研究所 | A kind of multiple-channel output inverse excitation type converter |
| CN109742952A (en) * | 2018-12-27 | 2019-05-10 | 广州金升阳科技有限公司 | A kind of magnetic isolation drive circuit |
| CN110572014A (en) * | 2019-08-29 | 2019-12-13 | 合肥博雷电气有限公司 | MOS tube driving circuit with turn-off negative voltage |
-
2017
- 2017-04-05 CN CN201720349313.7U patent/CN206595887U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149947A (en) * | 2018-09-29 | 2019-01-04 | 北京机械设备研究所 | A kind of multiple-channel output inverse excitation type converter |
| CN109742952A (en) * | 2018-12-27 | 2019-05-10 | 广州金升阳科技有限公司 | A kind of magnetic isolation drive circuit |
| CN110572014A (en) * | 2019-08-29 | 2019-12-13 | 合肥博雷电气有限公司 | MOS tube driving circuit with turn-off negative voltage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103066814B (en) | A kind of isolated drive circuit | |
| CN103199677B (en) | Single channel isolated form MOSFET drive circuit | |
| CN103138541B (en) | Drive transformer isolation self-adaptation drive circuit | |
| CN101345487B (en) | Primary sampling current controlled synchronous commutation driving circuit | |
| CN206595887U (en) | A kind of switching mode power supply transformer isolated drive circuit | |
| CN102594101A (en) | Isolated rapid turn-off metal oxide field effect transistor (MOFET) driving circuit | |
| CN110311572A (en) | A kind of transformer isolation drive control method and its isolated drive circuit | |
| CN202524281U (en) | Isolated rapid turn-off oxide field effect transistor (MOFET) driving circuit | |
| CN104269997B (en) | A kind of adjustable transformer isolation complementary drive circuit in dead band | |
| CN201018405Y (en) | Whole bridge phase-shift drive circuit | |
| CN101488719B (en) | Synchronous rectifying driver circuit suitable for voltage-multiplying rectifying | |
| CN103595226B (en) | Transformer isolation symmetrical complement drive circuit | |
| CN102280990B (en) | Magnetic isolation driving circuit | |
| CN202435332U (en) | Low-cost and high-isolation-characteristic bootstrap driving circuit of switched reluctance motor | |
| CN104539167B (en) | Synchronous rectification control method of push-pull converter and control chip | |
| CN203590008U (en) | Transformer isolation symmetry complementation drive circuit | |
| CN101588138B (en) | Synchronous rectification driving circuit suitable for central tapped structure rectifying circuit | |
| CN203368305U (en) | Driving circuit of IGBT module power switch | |
| CN206650647U (en) | A kind of High Power IGBT Driver Circuit | |
| CN109245498A (en) | A kind of double-transistor flyback Topology Switch power circuit for realizing driving using transformer leakage inductance | |
| CN203027119U (en) | Isolating adaptive drive circuit of driver transformer | |
| CN207069914U (en) | Ultrasonic wave High Power IGBT Driver Circuit | |
| CN103633844B (en) | A kind of magnetic coupling type high-gain DC/DC changer | |
| CN201608695U (en) | Blocking drive device | |
| CN203326887U (en) | Frequency-multiplication full-bridge conversion circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 250000 No. 2877 Kehang Road, Suncun Town, Jinan High-tech District, Shandong Province Patentee after: Shandong beyond CNC electronic Limited by Share Ltd Address before: 250104 No. 2877 Kehang Road, Sun Village Town, Jinan High-tech Zone, Shandong Province Patentee before: Chaoyue Digital Controlling Electronic Co., Ltd., Shandong Prov. |
|
| CP03 | Change of name, title or address | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171027 Termination date: 20200405 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |