KR920000252Y1 - Protection circuit of power transistor for motor drive - Google Patents
Protection circuit of power transistor for motor drive Download PDFInfo
- Publication number
- KR920000252Y1 KR920000252Y1 KR2019890020459U KR890020459U KR920000252Y1 KR 920000252 Y1 KR920000252 Y1 KR 920000252Y1 KR 2019890020459 U KR2019890020459 U KR 2019890020459U KR 890020459 U KR890020459 U KR 890020459U KR 920000252 Y1 KR920000252 Y1 KR 920000252Y1
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- KR
- South Korea
- Prior art keywords
- motor
- transistor
- power transistor
- capacitor
- protection circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- Control Of Direct Current Motors (AREA)
Abstract
내용 없음.No content.
Description
제1a, 1b 및 1c도는 종래의 모터 구동용 파워 트랜지스터의 보호 회로도.1A, 1B and 1C are protection circuit diagrams of a conventional motor driving power transistor.
제2도는 본 고안에 따른 일 실시예의 모터 구동용 파워 트랜지스터의 보호 회로도.2 is a protection circuit diagram of a motor driving power transistor according to an embodiment of the present invention.
제3도는 상기 파워 트랜지스터의 구동시에 발생하는 베이스와 에미터 단자의 전압 파형도.3 is a voltage waveform diagram of a base and an emitter terminal generated when the power transistor is driven.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings
M : 모터 FD1 : 플라이휠 다이오드M: Motor FD1: Flywheel Diode
TR1 : 파워 트랜지스터 C1 : 캐패시터TR1: power transistor C1: capacitor
본 고안은 모터 구동용 파워 트랜지스터 보호 회로에 관한 것으로, 특히 상기 아워 트랜지스터 보호 스너버(snubber)회로를 개량한 스너버 회로에 관한 것이다.The present invention relates to a power transistor protection circuit for driving a motor, and more particularly to a snubber circuit in which the hour transistor protection snubber circuit is improved.
통상 모터 구동회로에서 파워 트랜지스터의 응용은 다상 인버터용, DC 모터 정·역전 제어용 브리지 회로, 스텝핑 모터 구동용이 주류를 이루고 있다. 또한 근래에 이 파워 트랜지스터의 스위칭은 펄스 폭 변조(PWM)방식을 이용하여 모터의 속도 제어가 이루어지고 있다.In general, the application of power transistors in motor driving circuits is mainly used for multi-phase inverters, bridge circuits for DC motor forward and reverse control, and stepping motor driving. In recent years, the switching of the power transistor has been controlled by the speed control of the motor by using pulse width modulation (PWM).
그러나 상기 파워 트랜지스터를 구동시킬때, 필연적인 스위칭 작용에 의해 발생하는 서지전압이 문제였다. 그리하여 종래에는 제1a, 1b 및 1c도에 도시된 바와같은 보호 스너버 회로를 내장하고 있었다. 제1a도에서는 파워 트랜지스터가 외부의 구동 신호에 의해 턴오프될때 발생된 서지 전압이 저항(R)과 캐패시터(C)로 분압되며, 제1b도 및 1c도에서는 저항(R)에 병렬 접속된 다이오드(D)에 의해 상기 저항(R)양단에 인가되는 전압을 더 감소 시키게 된다.However, when driving the power transistor, the surge voltage caused by the inevitable switching action was a problem. Thus, conventionally, a protective snubber circuit as shown in Figs. 1A, 1B and 1C has been incorporated. In FIG. 1A, the surge voltage generated when the power transistor is turned off by an external driving signal is divided by the resistor R and the capacitor C. In FIGS. 1B and 1C, a diode connected in parallel to the resistor R is illustrated. (D) further reduces the voltage applied across the resistor (R).
그러나, 상기한 바와같은 종래의 구성은 파워 트랜지스터의 오프시에 발생하는 서지 전압을 제어할 목적으로 사용되었기 때문에 파워 트랜지스터 온시에 발생하는 서지 전압에 대해서는 거의 보호받지 못한다는 문제가 있었다.However, the above-described conventional configuration has been used for the purpose of controlling the surge voltage generated when the power transistor is turned off, so that there is a problem that the surge voltage generated when the power transistor is turned on is hardly protected.
따라서, 본 고안은 상기 문제점을 해결하고자 하여 파워 트랜지스터의 온 및 오프시에 모터의 코일에서 발생하는 순간 서지 전압을 제어할 목적으로 고안되었는바, 그 목적은 또한 그에 합당한 개량된 스너버 회로를 제공하고자 하는 것이다.Therefore, the present invention was devised to solve the above problem and to control the instantaneous surge voltage occurring in the coil of the motor when the power transistor is on and off, and the object is also to provide an improved snubber circuit accordingly. I would like to.
이하 본 고안은 첨부 도면을 참조하여 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
제2도는 참조하면, 본 고안에 따른 개선된 스너버회로는 통상적으로 모터(M)와, 모터 구동용 파워 트랜지스터(TR1)와, 모터(M)에 병렬로 접속된 플라이휠 다이오드(FD1)가 도시되며, 또한 상기 트랜지스터(TR1)의 에미터 단자와 모터(M)의 한 단자와의 접속점에 접속된 다이오드 (D1)와; 상기 트랜지스터(TR1)의 코렉터 단자와 전원(+)단자와의 접속점에 접속된 다이오드(D2)와; 상기 각각의 다이오드(D1 및 D2)와 직렬로 접속되고, 모터(M)와 병렬 접속된 충전용 캐패시터(C1)와; 상기 각각의 다이오드(D1 및 D2)와 병렬로 접속되고, 상기 캐패시터(C1)와 직렬 결합되는 공통 저항( R1)으로 구성되어 있다.Referring to FIG. 2, the improved snubber circuit according to the present invention typically shows a motor M, a motor driving power transistor TR1, and a flywheel diode FD1 connected in parallel to the motor M. FIG. A diode D1 connected to a connection point between the emitter terminal of the transistor TR1 and one terminal of the motor M; A diode (D2) connected to a connection point between the collector terminal of the transistor (TR1) and a power supply (+) terminal; A charging capacitor C1 connected in series with the respective diodes D1 and D2 and connected in parallel with the motor M; It is composed of a common resistor R1 connected in parallel with the respective diodes D1 and D2 and coupled in series with the capacitor C1.
상기와 같은 구성된 본 고안에 따른 회로에 있어서, 파워 트랜지스터(TR1)를 제어하는 외부로 부터의 구동신호, 예를 들면 PWM 신호가 인가될때, 파워 트랜지스터 (TR1)는 그 베이스 단자에 인가되는 PWM신호의 튜티율(Duty Rate)에 따라 순차적으로 온/오프 된다. 트랜지스터(TR1)가 온되는 순간 모터(M)의 양단에는 급격히 큰 전류가 유입된다.In the circuit according to the present invention configured as described above, when a drive signal from the outside controlling the power transistor TR1, for example, a PWM signal is applied, the power transistor TR1 is a PWM signal applied to its base terminal. It is sequentially turned on / off according to the duty rate of. The instant a large transistor flows in both ends of the motor M at the moment the transistor TR1 is turned on.
즉 모터(M)의 필드 코일(도시않됨)에서라는 급격한 서지 전압이 발생된다. 이때 이 서지 전압은 다이오드(D1)를 통하여 캐패시터(C1)로 순간적으로 충전 된다. 이렇게 캐패시터(C1)에 충전된 전하는 정상 상태(제3도의 (1)참조)시에 저항(R1)을 통하여 열로 소모 되면서 방전된다.That is, in the field coil (not shown) of the motor M Sudden surge voltage is generated. At this time, the surge voltage is instantaneously charged to the capacitor C1 through the diode D1. The electric charge charged in the capacitor C1 is discharged as it is consumed as heat through the resistor R1 in the normal state (see (1) of FIG. 3).
또한 PWM 신호에 의해 트랜지스터(TR1)가 순간적으로 오프될때 전원(vd)으로부터 트랜지스터(TR1)로 흐르는 전류가 순간적으로 차단되면서 전원 공급선상에 존재하는 인덕턴스 성분에 의해 또다시 큰 서지 전압이 모터(M)의 양단에 인가된다. 이때 발생된 서지 전압은 다이오드(D2)를 통하여 캐패시터(C1)에 충전된다. 또한 정상상태 (제3도의 (2)참조)시에 캐패시터(C1)에 충전된 전하는 저항(R1)을 통하여 열로서 방출된다.In addition, when the transistor TR1 is momentarily turned off by the PWM signal, the current flowing from the power supply vd to the transistor TR1 is momentarily interrupted, and again, a large surge voltage is generated by the inductance component present on the power supply line. Is applied at both ends. The generated surge voltage is charged in the capacitor C1 through the diode D2. In addition, in the steady state (see (2) in FIG. 3), the electric charge charged in the capacitor C1 is released as heat through the resistor R1.
제2도는 상기 파워 트랜지스터(TR1)의 베이스 및 에미터 단자에 인가되는 전압 신호를 도시한 것이다.2 illustrates a voltage signal applied to the base and emitter terminals of the power transistor TR1.
여기에서 에미터 단자에 인가되는 전압신호는 서지전압 때문에 베이스 단자 전압 보다 높은 것을 알수 있으며, 상기 설명된 바와같이 하이레벨 상태(1)와 로우레벨 상태(2)시에 저항(R1)을 통한 발열에 의해 충전 전하를 소모시킨다. 따라서 상기 기술된 바와같이 스위칭 수단의 스위칭 작용에 의해발생하는 서지전압을 온/오프시에 모두 제어할 수 있기 때문에 파워 트랜지스터의 신뢰성을 향상시킬 수 있으며, 또한 더불어 모터의 보조 작용을 수행할 수 있다.Here, it can be seen that the voltage signal applied to the emitter terminal is higher than the base terminal voltage because of the surge voltage, and as described above, heat is generated through the resistor R1 during the high level state 1 and the low level state 2. Consumes charge charge. Therefore, as described above, since the surge voltage generated by the switching action of the switching means can be controlled both on and off, the reliability of the power transistor can be improved, and the auxiliary action of the motor can be performed. .
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890020459U KR920000252Y1 (en) | 1989-12-29 | 1989-12-29 | Protection circuit of power transistor for motor drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890020459U KR920000252Y1 (en) | 1989-12-29 | 1989-12-29 | Protection circuit of power transistor for motor drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR910013147U KR910013147U (en) | 1991-07-30 |
| KR920000252Y1 true KR920000252Y1 (en) | 1992-01-15 |
Family
ID=19294496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019890020459U Expired KR920000252Y1 (en) | 1989-12-29 | 1989-12-29 | Protection circuit of power transistor for motor drive |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR920000252Y1 (en) |
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1989
- 1989-12-29 KR KR2019890020459U patent/KR920000252Y1/en not_active Expired
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| Publication number | Publication date |
|---|---|
| KR910013147U (en) | 1991-07-30 |
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