KR20000066088A - Protection unit for BLDC motor - Google Patents

Protection unit for BLDC motor Download PDF

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Publication number
KR20000066088A
KR20000066088A KR1019990012938A KR19990012938A KR20000066088A KR 20000066088 A KR20000066088 A KR 20000066088A KR 1019990012938 A KR1019990012938 A KR 1019990012938A KR 19990012938 A KR19990012938 A KR 19990012938A KR 20000066088 A KR20000066088 A KR 20000066088A
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KR
South Korea
Prior art keywords
unit
resistor
inverter
overload
igbt
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KR1019990012938A
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Korean (ko)
Inventor
정승규
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구자홍
엘지전자 주식회사
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Priority to KR1019990012938A priority Critical patent/KR20000066088A/en
Publication of KR20000066088A publication Critical patent/KR20000066088A/en

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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
    • H02H7/10—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 converters; for rectifiers
    • H02H7/12—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 converters; for rectifiers for static converters or rectifiers
    • H02H7/122—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 converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1225—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 converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
    • 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
    • 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
    • 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
    • H02H7/20—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 electronic equipment

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE: An inverter protector of blushless DC motor is provided to sense the overload and arm short status of an inverter unit to block switching signals to the inverter unit, thereby protecting IGBT(isolation gate bipolar transistor) consisting the inverter unit. CONSTITUTION: An inverter protector of blushless DC motor comprises an inverter unit(2), a motor unit(3), a gate driver unit(7), first to third resistors(R1-R3), an overload detector unit(4), an arm short detector unit(5) and a micom(6). The resistor(R1) is connected to respective emitter of IGBT(T2,T4,T6) and a power supply(1). The resistor(R2) is serially connected to an IGBT(T1). The resistor(R3) is serially connected to the IGBT(T4). The overload detector unit(4) decides overload status in accordance with the voltage drop level of the resistor(R1). The arm short detector unit(5) decides arm short status in accordance with the voltage drop level of the resistors(R2,R3).

Description

무정류자 직류전동기의 인버터 보호장치 {Protection unit for BLDC motor}Inverter protection device for non-commutator DC motors {Protection unit for BLDC motor}

본 발명은 무정류자 직류전동기(BLDC motor)의 인버터 보호장치에 관한 것으로서 특히, 외부의 스위칭신호에 따라 모터부로 교류전원을 인가하기 위한 인버터를 구성하는 트랜지스터를 보호하기 위한 무정류자 직류전동기의 인버터 보호장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter protection device for a non-commutator DC motor. In particular, the inverter protection of a non-commutator DC motor for protecting a transistor constituting an inverter for applying AC power to a motor unit according to an external switching signal. Relates to a device.

도 1은 일반적인 무정류자 직류전동기의 구성을 나타내는 회로도이다.1 is a circuit diagram showing the configuration of a general non-commutator DC motor.

도 1을 참조하면, 참조번호 1은 R,S,T 3상의 교류전원을 정류하고 평활하여 시스템으로 공급하는 전원부를 나타내고, 2는 외부의 펄스폭변조(PWM) 신호에 따라 스위칭되어 상기 전원부(1)로부터 인가되는 직류출력을 3상의 교류전원으로 변환하여 출력하는 인버터부를 나타내고, 3는 상기 인버터부(2)로부터 제공되는 교류전원에 의해 회전 동작하는 모터부를 나타낸다.Referring to FIG. 1, reference numeral 1 denotes a power supply unit for rectifying and smoothing AC power of R, S, and T 3 phases and supplying the same to the system, and 2 is switched according to an external pulse width modulation (PWM) signal. An inverter section converts and outputs a DC output applied from 1) into an AC power supply of three phases, and 3 represents a motor section which rotates by an AC power supply provided from the inverter section 2.

상기에서 인버터부(2)는 2개씩 직렬로 연결된 6개의 부유게이트 바이폴라 트랜지스터(isolation gate bipolar transistor : 이하 IGBT라 함.)(T1-T6)로 이루어지는데, 그 중에서 제1,3,5 IGBT(T1,T3,T5)는 플러스(+)의 암(arm)을 구성하고, 제2,4,6 IGBT(T2,T4,T6)는 마이너스(-)의 암을 구성한다.The inverter unit 2 is composed of six floating gate bipolar transistors (IGBTs) (T1-T6) connected in series of two, wherein the first, third and fifth IGBTs T1, T3, and T5 constitute positive (+) arms, and second, 4, and 6 IGBTs (T2, T4, and T6) constitute negative (-) arms.

상기 인버터부(2)에서 직렬로 연결되는 2개의 IGBT의 게이트 단으로 입력되는 제어신호(S1 및 S1', S2 및 S2', S3 및 S3')는 서로 상반된 신호가 입력되어 하나의 IGBT가 온(on)상태가 되는 동안 다른 하나의 IGBT는 오프(off)상태가 된다.The control signals S1 and S1 ', S2 and S2', S3 and S3 'inputted to the gate terminals of two IGBTs connected in series in the inverter unit 2 are inputted with opposite signals to turn on one IGBT. While in the on state, the other IGBT is off.

상기와 같은 구성을 갖는 무정류자 직류전동기는, 사용자가 동작신호를 입력시키면 상기 인버터부(2)의 각 IGBT로 스위칭신호를 제공함으로써 상기 모터부(3)의 회전이 이루어지도록 한다.The non-commutator DC motor having the configuration as described above allows the rotation of the motor unit 3 by providing a switching signal to each IGBT of the inverter unit 2 when the user inputs an operation signal.

그러나, 상기와 같은 종래 기술에서는 과부하 또는 암쇼트(arm short)가 발생된 경우 인버터부(2)를 구성하는 IGBT의 파손이 발생되거나, 수명을 단축시키는 문제점이 발생한다.However, in the prior art as described above, when an overload or an arm short occurs, breakage of the IGBT constituting the inverter unit 2 occurs, or a problem of shortening the life occurs.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 그 목적은 인버터부의 과부하(overload) 및 암쇼트(arm short) 상태를 감지하여 인버터부로 제공되는 스위칭신호를 차단시킴으로써 모터부의 동작을 정지시켜 인버터부를 구성하는 IGBT를 보호할 수 있도록 하는 무정류자 직류전동기의 인버터 보호장치를 제공하는데 있다.The present invention has been made to solve the above problems, the object is to detect the overload and arm short state of the inverter unit to stop the operation of the motor unit by blocking the switching signal provided to the inverter unit The present invention provides an inverter protection device for a non-commutator DC motor to protect the IGBT constituting the inverter unit.

도 1은 일반적인 무정류자 직류전동기의 구성을 나타내는 도면,1 is a view showing the configuration of a general non-commutator DC motor,

도 2는 본 발명에 의한 무정류자 직류전동기의 구성을 나타내는 도면.2 is a view showing the configuration of a non-commutator DC motor according to the present invention.

＜ 도면의 주요 부분에 대한 부호의 설명 ＞<Description of the code | symbol about the principal part of drawing>

1 : 전원부 2 : 인버터부1: power supply part 2: inverter part

3 : 모터부 4 : 과부하 검출부3: motor part 4: overload detection part

5 : 암쇼트 검출부 6 : 마이컴5: arm short detection unit 6: microcomputer

7 : 게이트 구동부 R1,R2,R3 : 저항7: Gate driver R1, R2, R3: resistance

상기와 같은 목적을 달성하기 위한 본 발명의 특징에 따르면, 외부로부터 공급되는 3상의 교류전원을 정류하고 평활하는 전원부와, 2개씩 직렬로 연결된 6개의 IGBT(isolation gate bipolar transistor)로 구성되고 펄스폭변조(PWM) 신호에 따라 스위칭되어 상기 전원부로부터 인가되는 직류출력을 3상의 교류전원으로 변환하는 인버터부와, 상기 인버터부로부터 제공되는 교류전원에 의해 회전 동작하는 모터부와, 상기 인버터부의 각 IGBT로 PWM신호를 제공하는 게이트 구동부를 포함하는 무정류자 직류전동기의 인버터 보호장치에 있어서,According to a feature of the present invention for achieving the above object, it consists of a power supply unit for rectifying and smoothing the three-phase AC power supplied from the outside, and six IGBTs (isolation gate bipolar transistor) connected in series two by two each and a pulse width An inverter unit which is switched according to a modulation (PWM) signal and converts a DC output applied from the power supply unit into a three-phase AC power source, a motor unit which is rotated by an AC power source provided from the inverter unit, and each IGBT In the inverter protection device of a non-commutator DC motor comprising a gate driver for providing a PWM signal,

상기 전원부와 인버터부의 사이에 배치되고 인버터부에서 마이너스(-)의 암을 구성하는 각 IGBT의 에미터에 공통으로 접속된 제1 저항과, 상기 인버터부에서 직렬로 연결되는 2개의 IGBT 중 플러스(+)의 암(arm)을 구성하는 IGBT에 직렬로 연결된 제2 저항과, 상기 인버터부에서 직렬로 연결되는 2개의 IGBT 중 마이너스(-)의 암(arm)을 구성하는 IGBT에 직렬로 연결된 제3 저항과, 상기 제1 저항의 전압강하 레벨에 따라 과부하(overload) 상태를 판단하는 과부하 검출부와, 상기 제2,3 저항의 전압강하 레벨에 따라 암쇼트(arm short) 상태를 판단하는 암쇼트 검출부와, 상기 과부하 검출부 및 암쇼트 검출부의 신호를 입력받고 과부하 또는 암쇼트 상태인 경우에 상기 게이트 구동부의 동작을 정지시키는 마이컴을 포함하는 무정류자 직류전동기의 인버터 보호장치를 제공한다.A first resistor disposed between the power supply unit and the inverter unit and commonly connected to the emitters of each IGBT constituting a negative arm in the inverter unit, and a positive one of two IGBTs connected in series in the inverter unit; A second resistor connected in series to the IGBT constituting the arm of +), and a second resistor connected in series to the IGBT constituting the negative arm of the two IGBTs connected in series at the inverter unit. An overload detector for determining an overload state according to the third resistor, the voltage drop level of the first resistor, and an arm short for determining an arm short state according to the voltage drop levels of the second and third resistors. Provided is an inverter protection device for a rectifier DC motor including a detection unit and a microcomputer to receive the signals of the overload detection unit and the arm short detection unit and to stop the operation of the gate driver in the case of an overload or dark short state. All.

이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 2는 본 발명에 의한 무정류자 직류전동기의 구성을 나타내는 도면이다.2 is a view showing the configuration of a non-commutator DC motor according to the present invention.

도 2를 참조하면, 도 1과 마찬가지로 참조번호 1은 전원부, 2는 인버터부, 3는 모터부를 나타낸다.Referring to FIG. 2, like FIG. 1, reference numeral 1 denotes a power supply unit, 2 denotes an inverter unit, and 3 denotes a motor unit.

또한, 참조부호 R1은 상기 인버터부(2)에서 마이너스(-)의 암을 구성하는 IGBT(T2,T4,T6)의 각각의 에미터에 공통으로 일단이 접속되고 타단은 전원부(1)에 접속된 제1 저항을 나타내고, R2는 상기 인버터부(2)에서 직렬로 연결되는 2개의 IGBT 중 플러스(+)의 암(arm)을 구성하는 IGBT(T1)에 직렬로 연결된 제2 저항을 나타내고, R3은 상기 인버터부(2)에서 직렬로 연결되는 2개의 IGBT 중 마이너스(-)의 암(arm)을 구성하는 IGBT(T4)에 직렬로 연결된 제3 저항을 나타낸다.Further, reference numeral R1 is connected in common to each emitter of the IGBTs (T2, T4, T6) constituting a negative (-) arm in the inverter section 2, and the other end is connected to the power supply section 1. Represents a first resistor, and R2 represents a second resistor connected in series to the IGBT T1 constituting a positive arm of two IGBTs connected in series at the inverter unit 2, R3 represents a third resistor connected in series to the IGBT T4 constituting a negative arm of two IGBTs connected in series in the inverter unit 2.

이때, 상기 모터부(3)의 전기자 권선 U,V,W에 흐르는 권선전류는 상기 제1 저항(R1)을 통해 흐르므로 상기 제1 저항(R1)의 전압강하에 의해서 모터부(3)의 부하전류(i)를 검출할 수 있다.At this time, since the winding current flowing through the armature windings U, V, and W of the motor unit 3 flows through the first resistor R1, the voltage of the first resistor R1 causes the The load current i can be detected.

또한, 상기 제2 저항(R2) 및 제3 저항(R3)에는 인버터부(2)가 정상적인 동작을 하는 경우 동시에 전류가 흐르는 경우는 없게 된다. 결국, 상기 제2 저항(R2) 및 제3 저항(R3)에서 동시에 전압강하가 발생되는 경우 암쇼트가 발생된 경우이다.In addition, when the inverter unit 2 normally operates, the current does not flow to the second resistor R2 and the third resistor R3 at the same time. As a result, when a voltage drop occurs simultaneously in the second resistor R2 and the third resistor R3, a dark short occurs.

한편, 참조번호 4는 상기 제1 저항(R1)에 병렬로 연결되어 모터부(3)의 과부하 상태를 판단하는 과부하 검출부를 나타내고, 5는 상기 제2 저항(R2) 및 제3 저항(R3)에 병렬로 연결되어 전압강하 레벨에 따라 암쇼트(arm short) 상태를 판단하는 암쇼트 검출부를 나타내고, 6은 상기 과부하 검출부(4) 및 암쇼트 검출부(5)의 출력신호에 따라 시스템의 동작을 제어하여 시스템을 보호하기 위한 마이컴을 나타내고, 7은 상기 마이컴(6)의 제어신호에 따라 상기 인버터부(2)의 각각의 IGBT의 게이트로 펄스폭변조(PWM) 신호 즉, 스위칭신호를 제공하는 게이트 구동부를 나타낸다.On the other hand, reference numeral 4 denotes an overload detection unit connected in parallel to the first resistor R1 to determine the overload state of the motor unit 3, and 5 denotes the second resistor R2 and the third resistor R3. Is connected in parallel to the arm short detection unit for determining an arm short state according to the voltage drop level, and 6 denotes an operation of the system according to the output signals of the overload detection unit 4 and the arm short detection unit 5. A microcomputer for controlling the system is protected, and 7 denotes a pulse width modulation (PWM) signal, that is, a switching signal, to a gate of each IGBT of the inverter unit 2 according to the control signal of the microcomputer 6. The gate driver is shown.

상기와 같은 구성을 갖는 본 발명의 동작을 설명하면 다음과 같다.Referring to the operation of the present invention having the configuration as described above are as follows.

먼저, 사용자가 마이컴(5)을 통해 동작신호를 입력시키면 상기 게이트 구동부(6)를 통해 스위칭신호가 인버터부(2)의 각 IGBT로 제공됨으로써 상기 모터부(3)의 회전이 이루어진다.First, when a user inputs an operation signal through the microcomputer 5, a switching signal is provided to each IGBT of the inverter unit 2 through the gate driver 6 to rotate the motor unit 3.

상기의 동작에 의해 모터부(3)의 회전이 이루어지는 동안 상기 과부하 검출부(4)에서는 상기 제1 저항(R1) 양단의 전압을 읽어서 전압강하 레벨에 따라 상기 모터부(3)의 부하전류(i)를 검출한다. 또한, 상기 암쇼트 검출부(5)에서는 제2 저항(R2) 및 제3 저항(R3)의 양단의 전압을 읽어서 전압강하 레벨에 따라 암쇼트(arm short) 상태를 판단한다. 이때, 상기 제2 저항(R2) 및 제3 저항(R3)에서 동시에 전압강하가 발생되는 경우에 암쇼트가 발생된 것으로 판단한다.While the motor unit 3 is being rotated by the above operation, the overload detection unit 4 reads the voltage across the first resistor R1 and loads current i of the motor unit 3 according to the voltage drop level. ). In addition, the arm short detection unit 5 reads the voltages of both ends of the second resistor R2 and the third resistor R3 to determine an arm short state according to the voltage drop level. In this case, it is determined that a dark short occurs when a voltage drop occurs simultaneously in the second resistor R2 and the third resistor R3.

상기 과부하 검출부(4)에서 과부하가 검출되거나, 암쇼트 검출부(5)에서 암쇼트가 검출되는 경우에 상기 마이컴(6) 및 게이트 구동부(7)로 그 상태를 알리는 신호가 출력되고, 상기 게이트 구동부(7)에서는 인버터부(2)의 각 IGBT의 게이트로 제공되는 스위칭신호를 모두 차단함으로써 모터부(3)의 동작을 정지시킨다.When an overload is detected by the overload detection unit 4 or an arm short is detected by the arm short detection unit 5, a signal indicating the state is output to the microcomputer 6 and the gate driver 7, and the gate driver In (7), the operation of the motor unit 3 is stopped by blocking all switching signals provided to the gates of the IGBTs of the inverter unit 2.

즉, 시스템에 이상이 발생된 경우에 동작을 정지시킴으로써 인버터부(2)를 구성하는 IGBT의 파손을 방지하게 된다.That is, when an abnormality occurs in the system, the operation is stopped to prevent the IGBT constituting the inverter unit 2 from being damaged.

이상에서 설명한 바와 같은 본 발명에 의한 무정류자 직류전동기의 인버터 보호장치는 인버터부에 걸리는 과부하 상태 및 암쇼트 상태에 따라 시스템의 동작을 정지시키기 때문에 인버터부의 각 IGBT가 파손되는 것을 방지할 수 있으며, 각 IGBT의 수명을 연장시킬 수 있게 되는 효과가 있다.As described above, the inverter protection device of the non-commutator DC motor according to the present invention stops the operation of the system according to the overload state and the arm short state applied to the inverter unit, thereby preventing damage to each IGBT of the inverter unit. There is an effect that can extend the life of each IGBT.

Claims (1)

외부로부터 공급되는 3상의 교류전원을 정류하고 평활하는 전원부와, 2개씩 직렬로 연결된 6개의 IGBT(isolation gate bipolar transistor)로 구성되고 펄스폭변조(PWM) 신호에 따라 스위칭되어 상기 전원부로부터 인가되는 직류출력을 3상의 교류전원으로 변환하는 인버터부와, 상기 인버터부로부터 제공되는 교류전원에 의해 회전 동작하는 모터부와, 상기 인버터부의 각 IGBT로 PWM신호를 제공하는 게이트 구동부를 포함하는 무정류자 직류전동기의 인버터 보호장치에 있어서,DC power supply rectifying and smoothing three-phase AC power supplied from the outside, and six IGBTs (isolation gate bipolar transistors) connected in series two by two, and are switched according to a pulse width modulation (PWM) signal and applied from the power supply. A rectifier DC motor comprising an inverter unit for converting an output into a three-phase AC power source, a motor unit rotating by an AC power source provided from the inverter unit, and a gate driver unit providing a PWM signal to each IGBT of the inverter unit. In the inverter protection device of, 상기 전원부와 인버터부의 사이에 배치되고 인버터부에서 마이너스(-)의 암을 구성하는 각 IGBT의 에미터에 공통으로 접속된 제1 저항과, 상기 인버터부에서 직렬로 연결되는 2개의 IGBT 중 플러스(+)의 암(arm)을 구성하는 IGBT에 직렬로 연결된 제2 저항과, 상기 인버터부에서 직렬로 연결되는 2개의 IGBT 중 마이너스(-)의 암(arm)을 구성하는 IGBT에 직렬로 연결된 제3 저항과, 상기 제1 저항의 전압강하 레벨에 따라 과부하(overload) 상태를 판단하는 과부하 검출부와, 상기 제2,3 저항의 전압강하 레벨에 따라 암쇼트(arm short) 상태를 판단하는 암쇼트 검출부와, 상기 과부하 검출부 및 암쇼트 검출부의 신호를 입력받고 과부하 또는 암쇼트 상태인 경우에 상기 게이트 구동부의 동작을 정지시키는 마이컴을 포함하는 것을 특징으로 하는 무정류자 직류전동기의 인버터 보호장치.A first resistor disposed between the power supply unit and the inverter unit and commonly connected to the emitters of each IGBT constituting a negative arm in the inverter unit, and a positive one of two IGBTs connected in series in the inverter unit; A second resistor connected in series to the IGBT constituting the arm of +), and a second resistor connected in series to the IGBT constituting the negative arm of the two IGBTs connected in series at the inverter unit. An overload detector for determining an overload state according to the third resistor, the voltage drop level of the first resistor, and an arm short for determining an arm short state according to the voltage drop levels of the second and third resistors. And a microcomputer to stop the operation of the gate driver when an overload or dark short detection signal is received from the overload detection unit and the arm short detection unit. Protection.
KR1019990012938A 1999-04-13 1999-04-13 Protection unit for BLDC motor KR20000066088A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040016475A (en) * 2002-08-17 2004-02-25 학교법인 두원학원 Local protection circuit of power supply
KR100657998B1 (en) * 2004-12-14 2006-12-14 한국철도기술연구원 System of cut the power supply using mass semiconductor device
KR100879535B1 (en) * 2007-03-27 2009-01-22 모건코리아 주식회사 Electric motor actuator
KR20110026192A (en) * 2009-09-07 2011-03-15 삼성전자주식회사 Protecting apparatus and method for half/full bridge circuit which have the first switching unit and the second switching unit connected to the first switching unit in series in image forming apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040016475A (en) * 2002-08-17 2004-02-25 학교법인 두원학원 Local protection circuit of power supply
KR100657998B1 (en) * 2004-12-14 2006-12-14 한국철도기술연구원 System of cut the power supply using mass semiconductor device
KR100879535B1 (en) * 2007-03-27 2009-01-22 모건코리아 주식회사 Electric motor actuator
KR20110026192A (en) * 2009-09-07 2011-03-15 삼성전자주식회사 Protecting apparatus and method for half/full bridge circuit which have the first switching unit and the second switching unit connected to the first switching unit in series in image forming apparatus
US8502123B2 (en) 2009-09-07 2013-08-06 Samsung Electronics Co., Ltd. Apparatus and method to protect half or full bridge circuit including first switching unit and second switching unit in image forming apparatus performing induction heating

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