CN102522978A - Isolation type power transistor driver - Google Patents

Isolation type power transistor driver Download PDF

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Publication number
CN102522978A
CN102522978A CN2012100031227A CN201210003122A CN102522978A CN 102522978 A CN102522978 A CN 102522978A CN 2012100031227 A CN2012100031227 A CN 2012100031227A CN 201210003122 A CN201210003122 A CN 201210003122A CN 102522978 A CN102522978 A CN 102522978A
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China
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circuit
signal
power
output
used
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CN2012100031227A
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Chinese (zh)
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CN102522978B (en
Inventor
夏振宏
陈连喜
祁素玲
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河南华南医电科技有限公司
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Publication of CN102522978A publication Critical patent/CN102522978A/en
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Publication of CN102522978B publication Critical patent/CN102522978B/en

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Abstract

The invention discloses an isolation type power transistor driver, which comprises a pulse width modulation (PWM) controller, an input driver, an isolating circuit, an output driving circuit and a power transistor control circuit, wherein the PWM controller is used for outputting a square-wave signal with adjustable frequency and an adjustable duty ratio, and the square-wave signal is a transistor-transistor logic (TTL) level or a complementary metal oxide semiconductor (CMOS) level; the input driver is used for realizing the conversion of a TTL or CMOS logic signal of an input stage to a level required by a post-stage circuit; the isolating circuit is used for realizing the isolation of an input-stage control signal from an output-stage power signal; the output driving circuit is used for converting a logic signal output by the isolating circuit into a power control signal; and the power transistor control circuit is used for judging and controlling the on or off of a power transistor according to the control signal provided by the output driving circuit. By the isolation type power transistor driver, the problems of the prior art are effectively solved; and the isolation type power transistor driver can be applied in the field of high voltage power transistor control, and has high driving capability, high switching speed and stable performance.

Description

Isolated form power tube driver

Technical field

Application of the present invention is an electric and electronic technical field, relates generally to a kind of isolated form power tube driver.

Background technology

The high-pressure type power tube has a wide range of applications in fields such as Digit Control Machine Tool, automotive electronics, Switching Power Supply, digital sound, wireless telecommunications.In existing technology, analog line driver is generally operational in the low-voltage field, is difficult to satisfy the demand in high voltage applications field.Nowadays the high voltage integrated circuit that emerges (HVIC) is applied in full-bridge or the half-bridge control field below the 1KV more; The power tube driver is applied in more has application below the 100V; It is blank out that kilovolt level power tube drives a field always, and the difficult problem that they are faced jointly is that the interference that power device and control section bring altogether can't fundamentally solve.How to improve power tube in the stability of high voltage control field work, effectively to bring into play its performance be the task of top priority.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of isolated form power tube driver, efficiently solve the problems of the prior art, can be applicable to high voltage power management and control system field, driving force is strong, and switching speed is fast, stable performance.

The present invention adopts following technical scheme:

A kind of isolated form power tube driver is characterized in that: said isolated form power tube driver comprises PWM controller, enter drive, buffer circuit, output driving circuit and power tube control circuit; Said PWM controller is used for the square-wave signal of output frequency and EDM Generator of Adjustable Duty Ratio, and said square-wave signal is Transistor-Transistor Logic level or CMOS level; Said enter drive is used to realize the conversion to the required level of late-class circuit of TTL or the CMOS logical signal of input stage; Said buffer circuit is used to realize the isolation of input stage control signal and output-stage power signal; Said output driving circuit is used for converting the logical signal of buffer circuit output into power control signal; Said power tube control circuit is used for judging that according to the control signal that output driving circuit provides the power controlling pipe opens or turn-off; The signal ground of said output driving circuit connects the source electrode of power tube, and signal output part connects the grid of power tube, and the drain electrode of power tube meets power supply VCC3.

Further, said current mode switch circuit comprises P-channel field-effect transistor (PEFT) pipe, N channel field-effect pipe, resistance and electric capacity.

Further, said output loading circuit comprises resistance, power field effect pipe and load resistance.

Further, said buffer circuit comprises signal isolation circuit and power isolation circuit.

The invention has the beneficial effects as follows:

The present invention is a kind of power tube driver that can be applicable to the control of high voltage field, is based on the power tube driver of Signal Spacing and isolated from power, is different from the non-isolation type power tube driver of general commercial.The present invention can be applied to high voltage power management and control system field, and is simple in structure, is easy to realize; Driving force is strong, can effectively reduce the influence of fet gate electric capacity; Pass speed is fast, can satisfy the demand in different application place.

Description of drawings

Fig. 1 is a theory diagram of the present invention;

Fig. 2 is circuit theory diagrams of the present invention.

Embodiment

Below in conjunction with accompanying drawing and instance the present invention is further described:

As shown in Figure 1, the present invention includes PWM controller 1, enter drive 2, buffer circuit 3, output driving circuit 4 and power tube control circuit 5.PWM controller 1 is used for the square-wave signal of output frequency and EDM Generator of Adjustable Duty Ratio, and the square-wave signal of being exported by PWM controller 1 can be Transistor-Transistor Logic level or CMOS level.

Enter drive 2 is used to realize the conversion of the TLL level of input stage to the required level of late-class circuit; Buffer circuit 3 is used to realize the isolation of input stage control signal and output-stage power signal, and through output driving circuit 4, the control signal after the isolation can be used for the conducting and the shutoff of power controlling pipe by power tube control circuit 5.Output driving circuit 4 is used for converting the logical signal of buffer circuit 3 output into power control signal, and power tube control circuit 5 is used for judging that according to the control signal that output driving circuit 4 provides the power controlling pipe opens or turn-off.

As shown in Figure 2, the function of enter drive 2 is that TTL or the CMOS logical signal (being generally pwm signal) with input is transformed into the control signal of can the power controlling plumber doing (being generally 10 volts grades logical signal); The Transistor-Transistor Logic level of input stage is the signal from PWM controller 1 or high-frequency clock; The logic level at its place can not directly be used for driving high-power FET; The logical signal that comes out through enter drive is being 0 volt or 12 volts, can be used for driving high-power FET.The low at a high speed enter drive 2 that postpones converts the Transistor-Transistor Logic level of input stage into 0 to 10 volt of level logic level, is enough to the work of power controlling pipe.

Buffer circuit 3 is used to realize the electrical isolation of drive circuit output and back level driving stage.Buffer circuit 3 comprises control logic isolation (Signal Spacing) circuit and power isolation circuit two parts altogether.Wherein logic isolation and isolated from power can be selected the rank of electrical isolation according to application places.Isolated from power provides the power input for the driver of back level.Through buffer circuit 3, the signal of low-voltage input controlled stage and high voltage output stage have realized the isolation on electric fully.

The effect of output driving circuit 4 is to convert the logical signal that buffer circuit 3 is exported into power control signal.The difference of two kinds of signals is the difference of its carrying load ability.Logical signal only provides high-low level, does not have carrying load ability, can not directly be used for the power controlling plumber and do.Power control signal is the signal of logical signal after driving, and carrying load ability is arranged, and can directly be used for the control of power tube.Output driving circuit 4 comprises a NPN type triode Q1 and a positive-negative-positive triode Q2; The collector electrode of triode Q1 meets power supply VCC2; Emitter connects the emitter of triode Q2, and base stage connects the base stage of the signal output part and the triode Q2 of buffer circuit, the grounded collector of triode Q2 respectively.Output driving circuit 4 signal grounds connect the source electrode of power tube, and signal output part connects the grid of power tube, and the drain electrode of power tube meets power supply VCC3.

It is core thinking of the present invention that the power control signal of power tube control circuit 5 and power tube are realized floatingly.The not shared cover power supply of power control signal and power tube, thus can realize the control of power tube and do not receive the influence of power tube electric power system.Power tube control circuit 5 can replace the partial function of HVIC and remedy its deficiency in high voltage control field, can remedy the defective of non-isolation type driver in hectovolt level application.Can be widely used among the circuit such as High-Power BUCK type Switching Power Supply, the driving of half-bridge flash.

The course of work of the present invention is: the logic control signal that is generally COMS level or Transistor-Transistor Logic level of PWM controller 1 output; Enter drive 2 receives the control signal of PWM controllers 1 output, and is converted into to control and opens or the logical signal of turn-off function pipe.Buffer circuit 3 receives the output of enter drives 2, and realizes the isolation of control signal on electric.Output driving circuit 4 receives the isolation signals of buffer circuit 3 outputs, and converts it into directly signal of driving power pipe.The signal ground of output driving circuit 4 connects the source electrode of power tube, and signal output connects the grid of power tube.Realize the floating ground of output driving circuit 4 and power tube control circuit 5, and the control signal of can the power controlling pipe opening or judging is provided for power tube control circuit 5.

Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Other modifications that those of ordinary skills make technical scheme of the present invention perhaps are equal to replacement; Only otherwise break away from the spirit and the scope of technical scheme of the present invention, all should be encompassed in the middle of the claim scope of the present invention.

Claims (4)

1. isolated form power tube driver, it is characterized in that: said isolated form power tube driver comprises PWM controller, enter drive, buffer circuit, output driving circuit and power tube control circuit; Said PWM controller is used for the square-wave signal of output frequency and EDM Generator of Adjustable Duty Ratio, and said square-wave signal is Transistor-Transistor Logic level or CMOS level; Said enter drive is used to realize the conversion to the required level of late-class circuit of TTL or the CMOS logical signal of input stage; Said buffer circuit is used to realize the isolation of input stage control signal and output-stage power signal; Said output driving circuit is used for converting the logical signal of buffer circuit output into power control signal; Said power tube control circuit is used for judging that according to the control signal that output driving circuit provides the power controlling pipe opens or turn-off; The signal ground of said output driving circuit connects the source electrode of power tube, and signal output part connects the grid of power tube, and the drain electrode of power tube meets power supply VCC3.
2. a kind of novel power field effect pipe driver according to claim 1 is characterized in that: said current mode switch circuit comprises P-channel field-effect transistor (PEFT) pipe, N channel field-effect pipe, resistance and electric capacity.
3. a kind of novel power field effect pipe driver according to claim 1 and 2, it is characterized in that: said output loading circuit comprises resistance, power field effect pipe and load resistance.
4. a kind of novel power field effect pipe driver according to claim 3, it is characterized in that: said buffer circuit comprises signal isolation circuit and power isolation circuit.
CN 201210003122 2012-01-06 2012-01-06 Isolation type power transistor driver CN102522978B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201210003122 CN102522978B (en) 2012-01-06 2012-01-06 Isolation type power transistor driver

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Application Number Priority Date Filing Date Title
CN 201210003122 CN102522978B (en) 2012-01-06 2012-01-06 Isolation type power transistor driver

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CN102522978A true CN102522978A (en) 2012-06-27
CN102522978B CN102522978B (en) 2013-08-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103905031A (en) * 2013-12-27 2014-07-02 哈尔滨安天科技股份有限公司 RS-485 bus communication hardware blocking circuit
CN103941791A (en) * 2013-01-17 2014-07-23 常州隆辉照明科技有限公司 A circuit for reference ground connection conversion
CN108020792A (en) * 2017-12-07 2018-05-11 荣湃半导体(上海)有限公司 A kind of information detection and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1070069A (en) * 1992-08-20 1993-03-17 北京铁路局计量管理所 Double isolation driving circuit of power VMOS tube
CN2699577Y (en) * 2003-11-06 2005-05-11 李希珍 Isolating driver for insulated gate power tube
CN101008839A (en) * 2007-01-16 2007-08-01 北京航空航天大学 Finite angle driving controller of direct-drive triple redundant brushless DC torque motor
US7426126B1 (en) * 2007-08-16 2008-09-16 Li-Chun Lai Charge apparatus of an extension cord plug
CN102109856A (en) * 2010-12-24 2011-06-29 中国科学院长春光学精密机械与物理研究所 System for identifying parameters of reaction flywheel
CN202385080U (en) * 2012-01-06 2012-08-15 河南华南医电科技有限公司 Isolation power tube driver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1070069A (en) * 1992-08-20 1993-03-17 北京铁路局计量管理所 Double isolation driving circuit of power VMOS tube
CN2699577Y (en) * 2003-11-06 2005-05-11 李希珍 Isolating driver for insulated gate power tube
CN101008839A (en) * 2007-01-16 2007-08-01 北京航空航天大学 Finite angle driving controller of direct-drive triple redundant brushless DC torque motor
US7426126B1 (en) * 2007-08-16 2008-09-16 Li-Chun Lai Charge apparatus of an extension cord plug
CN102109856A (en) * 2010-12-24 2011-06-29 中国科学院长春光学精密机械与物理研究所 System for identifying parameters of reaction flywheel
CN202385080U (en) * 2012-01-06 2012-08-15 河南华南医电科技有限公司 Isolation power tube driver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941791A (en) * 2013-01-17 2014-07-23 常州隆辉照明科技有限公司 A circuit for reference ground connection conversion
CN103905031A (en) * 2013-12-27 2014-07-02 哈尔滨安天科技股份有限公司 RS-485 bus communication hardware blocking circuit
CN108020792A (en) * 2017-12-07 2018-05-11 荣湃半导体(上海)有限公司 A kind of information detection and method

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