CN203352423U - Switching tube driving amplifying circuit for switching power supply - Google Patents

Switching tube driving amplifying circuit for switching power supply Download PDF

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Publication number
CN203352423U
CN203352423U CN 201320278957 CN201320278957U CN203352423U CN 203352423 U CN203352423 U CN 203352423U CN 201320278957 CN201320278957 CN 201320278957 CN 201320278957 U CN201320278957 U CN 201320278957U CN 203352423 U CN203352423 U CN 203352423U
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CN
China
Prior art keywords
switching tube
power supply
switching
resistance
triode
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Expired - Fee Related
Application number
CN 201320278957
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Chinese (zh)
Inventor
燕云峰
喻朝中
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DONGGUAN YINGJU ELECTRONIC Co Ltd
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DONGGUAN YINGJU ELECTRONIC Co Ltd
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Priority to CN 201320278957 priority Critical patent/CN203352423U/en
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Publication of CN203352423U publication Critical patent/CN203352423U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to the technical field of drive of a switching tube of a switching power supply, particularly to a switching tube driving amplifying circuit for a switching power supply. When an output pulse of a driver chip U1 changes from a low level to a high level, conduction of a switching tube Q2 can be accelerated through a diode D1, thereby reducing conduction loss. When the output pulse of the driver chip U1 changes from a high level to a low level, the switching Q2 is cut off quickly through conduction of a triode Q1 and lowering of a grid level of the switching tube Q2, thereby reducing turn-off loss. Thus, compared with the prior art, the switching tube driving amplifying circuit for a switching power supply in the utility model enables conduction and turn-off delay time of the switching tube of the switching power supply to be shortened, thereby reducing switching loss.

Description

A kind of drive amplification of the switching tube for Switching Power Supply circuit
Technical field
The utility model relates to the switching tube Driving technique field of Switching Power Supply, particularly a kind of drive amplification of the switching tube for Switching Power Supply circuit.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch pipe turns on and off maintains a kind of power supply of regulated output voltage, and Switching Power Supply generally drives chip and switching tube to form by pulse width modulation (PWM).Along with development and the innovation of power electronic technology, make switch power technology also in constantly innovation.At present, Switching Power Supply, with small-sized, light weight and high efficiency characteristics nearly all electronic equipment that is widely used, is the indispensable a kind of power mode of current electronics and information industry develop rapidly.
In the Switching Power Supply evolution, its efficiency and protective value require more and more higher, and switching component characteristic and driving thereof are the key factors that affects its efficiency and protective value.But it is long that existing interlock circuit has ON time, minimum turn-off delay time is long, the shortcoming that switching loss is large.
Therefore, for solving weak point of the prior art, provide a kind of switching tube turn-on and turn-off switching tube drive amplification circuit short, that switching loss is little time of delay of Switching Power Supply that can make to seem particularly important.
Summary of the invention
The purpose of this utility model is to avoid above-mentioned weak point of the prior art and the drive amplification of the switching tube for the Switching Power Supply circuit that a kind of switching tube turn-on and turn-off time of delay that can make Switching Power Supply is short, switching loss is little is provided.
The purpose of this utility model is achieved through the following technical solutions:
A kind of drive amplification of the switching tube for Switching Power Supply circuit is provided, comprise and drive chip U1, diode D1, the triode Q1 of positive-negative-positive, resistance R 1, resistance R 2, resistance R 3 and for the switching tube Q2 of the transformer on/off of control switch power supply, the output of described driving chip U1 connects the positive pole of diode D1 and an end of resistance R 1, the base stage of the other end connecting triode Q1 of described resistance R 1, the end of the negative pole contact resistance R2 of described diode D1, the end of the other end while contact resistance R3 of described resistance R 2 and the emitter of triode Q1, the grid of the other end connecting valve pipe Q2 of described resistance R 3, the grounded collector of described triode Q1, the drain electrode of described switching tube Q2 connects the transformer of Switching Power Supply to control this transformer on/off, the source ground of described switching tube Q2.
Wherein, the grid of described switching tube Q2 also is connected with resistance R 4, and described resistance R 4 one ends are connected with the grid of switching tube Q2, other end ground connection.
Wherein, described switching tube Q2 is metal-oxide-semiconductor.
Wherein, described triode Q1 is MMBT3906 type triode.
The beneficial effects of the utility model: the utility model provides a kind of drive amplification of the switching tube for Switching Power Supply circuit, can pass through the conducting of diode D1 acceleration switch pipe Q2 when the output pulse that drives chip U1 becomes high level by low level, reduce conduction loss.When the output pulse that drives chip U1 becomes low level by high level, thereby drag down the mode of the grid level of switching tube Q2 by triode Q1 conducting, switching tube Q2 is ended rapidly, reduce turn-off power loss.Thereby compared with prior art, the utility model makes the switching tube turn-on and turn-off of Switching Power Supply shorten time of delay, thereby reduce switching loss.
The accompanying drawing explanation
The utility model is described in further detail to utilize accompanying drawing, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain according to the following drawings other accompanying drawing.
The circuit diagram of the embodiment that Fig. 1 is a kind of drive amplification of the switching tube for Switching Power Supply of the utility model circuit.
Embodiment
With the following Examples the utility model is further described.
One of embodiment of a kind of drive amplification of the switching tube for Switching Power Supply of the utility model circuit, as shown in Figure 1, comprise: drive chip U1, diode D1, the triode Q1 of positive-negative-positive, resistance R 1, resistance R 2, resistance R 3 and for the switching tube Q2 of the transformer on/off of control switch power supply, the output of described driving chip U1 connects the positive pole of diode D1 and an end of resistance R 1, the base stage of the other end connecting triode Q1 of described resistance R 1, the end of the negative pole contact resistance R2 of described diode D1, the end of the other end while contact resistance R3 of described resistance R 2 and the emitter of triode Q1, the grid of the other end connecting valve pipe Q2 of described resistance R 3, the grounded collector of described triode Q1, the drain electrode of described switching tube Q2 connects the transformer of Switching Power Supply to control this transformer on/off, the source ground of described switching tube Q2.The grid of described switching tube Q2 also is connected with resistance R 4, and described resistance R 4 one ends are connected with the grid of switching tube Q2, other end ground connection.Described switching tube Q2 is metal-oxide-semiconductor, and described triode Q1 is MMBT3906 type triode.
The circuit basic functional principle: drive conducting and the cut-off of chip U1 output pulse pulse control switch pipe Q2 in circuit, the specific works process is as follows:
Suppose that it is low level that T drives chip U1 output pulse constantly, now switching tube Q2 is in cut-off state, its grid is low level, it is very low level of Q2 current collection, instantly one constantly, when the output pulse becomes high level by low level, the rapid conducting of diode D1, because triode Q1 is positive-negative-positive number, and its emitter voltage is lower than base voltage, so triode Q1 cut-off, after triode Q1 cut-off, drive the high level pulse of chip U1 output directly to be added to the grid of switching tube Q2 by resistance R 2, therefore the grid of switching tube Q2 is high level, switching tube Q2 normally;
Suppose that it is high level that T drives chip U1 output pulse constantly, now switching tube Q2 is in conducting state, its grid is high level, be that triode Q1 launches very high level, instantly one constantly, when the output pulse becomes low level by high level, diode D1 ends rapidly, because triode Q1 is positive-negative-positive number, and its emitter voltage is higher than base voltage, so triode Q1 conducting, after triode Q1 conducting, its emitter voltage is dragged down rapidly, and the grid level of Q3 is pulled to low level, and switching tube Q2 ends rapidly.
In sum: after the output pulse that drives chip U1 becomes high level by low level, triode Q1 cut-off, switching tube Q2 becomes conducting state by cut-off state.After the output pulse that drives chip U1 becomes low level by high level, triode Q1 conducting, switching tube becomes cut-off state by conducting state.
Therefore this circuit can pass through the conducting of diode D1 acceleration switch pipe Q2 when the output pulse that drives chip U1 becomes high level by low level, reduce conduction loss.When the output pulse that drives chip U1 becomes low level by high level, thereby drag down the mode of the grid level of switching tube Q2 by triode Q1 conducting, switching tube Q2 is ended rapidly, reduce turn-off power loss.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not to the restriction of the utility model protection range; although with reference to preferred embodiment, the utility model has been done to explain; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not break away from essence and the scope of technical solutions of the utility model.

Claims (4)

1. the drive amplification of the switching tube for a Switching Power Supply circuit, it is characterized in that: comprise and drive chip U1, diode D1, the triode Q1 of positive-negative-positive, resistance R 1, resistance R 2, resistance R 3 and for the switching tube Q2 of the transformer on/off of control switch power supply, the output of described driving chip U1 connects the positive pole of diode D1 and an end of resistance R 1, the base stage of the other end connecting triode Q1 of described resistance R 1, the end of the negative pole contact resistance R2 of described diode D1, the end of the other end while contact resistance R3 of described resistance R 2 and the emitter of triode Q1, the grid of the other end connecting valve pipe Q2 of described resistance R 3, the grounded collector of described triode Q1, the drain electrode of described switching tube Q2 connects the transformer of Switching Power Supply to control this transformer on/off, the source ground of described switching tube Q2.
2. a kind of drive amplification of the switching tube for Switching Power Supply circuit as claimed in claim 1, it is characterized in that: the grid of described switching tube Q2 also is connected with resistance R 4, and described resistance R 4 one ends are connected with the grid of switching tube Q2, other end ground connection.
3. a kind of drive amplification of the switching tube for Switching Power Supply circuit as claimed in claim 1, it is characterized in that: described switching tube Q2 is metal-oxide-semiconductor.
4. a kind of drive amplification of the switching tube for Switching Power Supply circuit as claimed in claim 1, it is characterized in that: described triode Q1 is MMBT3906 type triode.
CN 201320278957 2013-05-21 2013-05-21 Switching tube driving amplifying circuit for switching power supply Expired - Fee Related CN203352423U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320278957 CN203352423U (en) 2013-05-21 2013-05-21 Switching tube driving amplifying circuit for switching power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320278957 CN203352423U (en) 2013-05-21 2013-05-21 Switching tube driving amplifying circuit for switching power supply

Publications (1)

Publication Number Publication Date
CN203352423U true CN203352423U (en) 2013-12-18

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762848A (en) * 2013-12-31 2014-04-30 江苏嘉钰新能源技术有限公司 Drive circuit for switch type double-end direct-current converter
CN104883034A (en) * 2015-05-14 2015-09-02 华为技术有限公司 Driving circuit of switching bridge arm and switching power supply
CN105589343A (en) * 2014-11-14 2016-05-18 西安电子科技大学 Single-power accurately controllable time switch based on programmable device
CN106997113A (en) * 2017-04-11 2017-08-01 京东方科技集团股份有限公司 Liquid crystal grating drive circuit and control system, 3D display devices
CN107591859A (en) * 2017-09-22 2018-01-16 中惠创智无线供电技术有限公司 A kind of wireless charging receives controller guard method and device
CN107994780A (en) * 2017-12-27 2018-05-04 诺仪器(中国)有限公司 Optical fiber splicer electrode bar electrion control circuit and method
CN109434246A (en) * 2018-11-19 2019-03-08 浙江金华巨能电子科技有限公司 A kind of Switching Power Supply control element of LNG ship argon arc welding welding machine
CN110233580A (en) * 2019-07-08 2019-09-13 广州市凯辉电子有限公司 A kind of high power constant compresses switch power supply
CN110380612A (en) * 2019-07-08 2019-10-25 广州市凯辉电子有限公司 A kind of Switching Power Supply of stable output
CN110545043A (en) * 2019-07-08 2019-12-06 广州市凯辉电子有限公司 Switching power supply and control circuit thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762848A (en) * 2013-12-31 2014-04-30 江苏嘉钰新能源技术有限公司 Drive circuit for switch type double-end direct-current converter
CN105589343A (en) * 2014-11-14 2016-05-18 西安电子科技大学 Single-power accurately controllable time switch based on programmable device
CN104883034A (en) * 2015-05-14 2015-09-02 华为技术有限公司 Driving circuit of switching bridge arm and switching power supply
CN104883034B (en) * 2015-05-14 2017-07-14 华为技术有限公司 Drive circuit and Switching Power Supply for switching bridge arm
CN106997113A (en) * 2017-04-11 2017-08-01 京东方科技集团股份有限公司 Liquid crystal grating drive circuit and control system, 3D display devices
CN106997113B (en) * 2017-04-11 2021-02-02 京东方科技集团股份有限公司 Liquid crystal grating driving circuit, control system and 3D display device
CN107591859A (en) * 2017-09-22 2018-01-16 中惠创智无线供电技术有限公司 A kind of wireless charging receives controller guard method and device
CN107994780A (en) * 2017-12-27 2018-05-04 诺仪器(中国)有限公司 Optical fiber splicer electrode bar electrion control circuit and method
CN109434246A (en) * 2018-11-19 2019-03-08 浙江金华巨能电子科技有限公司 A kind of Switching Power Supply control element of LNG ship argon arc welding welding machine
CN110233580A (en) * 2019-07-08 2019-09-13 广州市凯辉电子有限公司 A kind of high power constant compresses switch power supply
CN110380612A (en) * 2019-07-08 2019-10-25 广州市凯辉电子有限公司 A kind of Switching Power Supply of stable output
CN110545043A (en) * 2019-07-08 2019-12-06 广州市凯辉电子有限公司 Switching power supply and control circuit thereof

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131218

Termination date: 20190521

CF01 Termination of patent right due to non-payment of annual fee