KR920000251Y1 - Surge protective circuit - Google Patents

Surge protective circuit Download PDF

Info

Publication number
KR920000251Y1
KR920000251Y1 KR2019890019951U KR890019951U KR920000251Y1 KR 920000251 Y1 KR920000251 Y1 KR 920000251Y1 KR 2019890019951 U KR2019890019951 U KR 2019890019951U KR 890019951 U KR890019951 U KR 890019951U KR 920000251 Y1 KR920000251 Y1 KR 920000251Y1
Authority
KR
South Korea
Prior art keywords
plc
load
series
filter means
parallel
Prior art date
Application number
KR2019890019951U
Other languages
Korean (ko)
Other versions
KR910013142U (en
Inventor
김두성
Original Assignee
대우중공업 주식회사
이경훈
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 대우중공업 주식회사, 이경훈 filed Critical 대우중공업 주식회사
Priority to KR2019890019951U priority Critical patent/KR920000251Y1/en
Publication of KR910013142U publication Critical patent/KR910013142U/en
Application granted granted Critical
Publication of KR920000251Y1 publication Critical patent/KR920000251Y1/en

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/14—Plc safety

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Electronic Switches (AREA)

Abstract

내용 없음.No content.

Description

PLC의출력단 회로및 그의 부하 보호 회로PLC output stage circuit and its load protection circuit

제1도는 종래의 PLC부하 보호회로도.1 is a conventional PLC load protection circuit diagram.

제2도는 본 고안에 따라서 구성된 일실시예의 PLC 출력단 보호 회로도.2 is a PLC output stage protection circuit diagram of an embodiment constructed in accordance with the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

5 : 제1필터수단 7 : 제2필터 수단5: first filter means 7: second filter means

본 고안은 PLC에 관한 것으로, 특히 PLC의 출력단 및 이에 접속된 부하에서 발생하는 서지(surge) 및 역전압 으로부터 보호하기 위한 개선된 회로에 관한 것이다.The present invention relates to a PLC, and more particularly to an improved circuit for protecting against surge and reverse voltage occurring at the output of the PLC and the load connected thereto.

PLC는 최근 성능이 급속도로 발전하면서 현재는 공장 자동화의 중핵을 이루면서 중요한 위치를 차지하고 있다.PLC's recent advances in performance have made it an important part of today's factory automation.

따라서 사용되는 방식도 여러 종류가 있고, 예상 하지 못했던 트러블에 고전하는 경우도 있다. 이러한 이유 때문에 PLC를 사용한 시스템의 신뢰성을 학보하기 위해서는 PLC에 대한 스트레스, (예로서, 온도, 습도, 진동, 충격, 노이즈등)를 작게 해 주어야 한다. 이러한 외부적 요건 이외에도 많은 트러블이 발생되는데, 그 중에서도 특히 출력단에는 비교적 큰 전류의 개페작용에 기인하여 많은 노이즈가 발생되고 있다. 이러한 노이즈 현상중에는 PLC출력단의 스위칭 수단들, 예를들면 릴레이, 트라이악, 트랜지스터, 그리고 근자의 포터 커프러등으 스위칭 작용으로 인하여 야기되는 급격한 서지 현상과, 상기 스위칭 수단에 접속되어 실제적인 작동을 수행하는 출력기기, 예를들면 전자밸브, 마그네트 스위치, 표시등, 전자벨브 등의 부하에서 야기되는 역전력 발생 현상등이 있다.Therefore, there are many types of methods used, and sometimes there are problems with unexpected problems. For this reason, in order to study the reliability of a system using a PLC, it is necessary to reduce the stress on the PLC (eg, temperature, humidity, vibration, shock, noise, etc.). In addition to these external requirements, a lot of troubles are generated, and especially, a lot of noise is generated at the output stage due to the opening of a relatively large current. Among these noise phenomena, sudden surges caused by switching action of the switching means of the PLC output stage, such as relays, triacs, transistors, and porter cuffs of the roots, and the actual operation in connection with the switching means There is a reverse power generation phenomenon caused by the load of the output device, for example, the solenoid valve, the magnet switch, the indicator light, the solenoid valve.

종래에는 이것을 방지하기 위하여, 부하에 병렬로 다이오드 또는 바이스터등을 접속하여 부하에서 발생하는 역기전려을 바이패스킴으로써 그 부하를 보호 하였다.Conventionally, in order to prevent this, the load is protected by connecting a diode or a biaser to the load in parallel to bypass the counter electromotive force generated in the load.

그러나, 이 보호 방식은 서지에 대비한 수단이 없었기 때문에 서지가 발생하였을때 부하 분만아니라 PLC의 출력단도 보호될 수 없는 문제가 있었다.However, since this protection method has no means against surge, there was a problem that the output of the PLC as well as the load distribution cannot be protected when a surge occurs.

따라서 본 고안은 부하에 다이오드를 병렬로 접속 했을때의 부하보호 효과와 더불어 역 기전력과 서지로부터도 함께 보호받을 수 있게 개선된 수단으로, 그러한 기능을 달성하기 위한 회로를 제공하는 것을 또한 그 목적으로 한다.Therefore, the present invention is an improved means to be protected from back EMF and surge as well as load protection effect when diodes are connected in parallel to the load, and to provide a circuit for achieving such a function. do.

도면을 참조하여 설명하면, 제1도는 상기 설명된 바와같이, 부하(RL)에 병렬 접속된 다이오드(D1)를 통하여 발생된 역 기전력을 흐르게 하여 이를 모두 열에너지등으로 소진되게 한 종래의 개략적인 회로를 도시한 것이다.Referring to the drawings, FIG. 1 is a conventional schematic circuit in which a counter electromotive force generated through a diode D1 connected in parallel to a load RL flows out as a heat energy or the like, as described above. It is shown.

제2도는 본 고안에 따라서 출력단의 스위칭 수단중의 하나인 트랜지스터(TR)의 출력양단에 각기 병렬로 접속된 직렬의 RC 회로로 구성된 제1필터수단(5)과 직렬의 다이오드(D2)와 퓨우즈(F)로 구성된 제2필터수단(7)과, 출력기기인 부하(RL)가 도시된다.2 shows a diode D2 and a fuse in series with the first filter means 5 composed of a series RC circuit connected in parallel to both ends of the output of the transistor TR, which is one of the switching means of the output stage according to the present invention. A second filter means 7 composed of woods F and a load RL which is an output device are shown.

이제 그 동작을 상세히 설명하면, PLC의 입력단에 접속된 기기로 부터의 신호를 입력받아, 이를 연산처리한 CPU로 부터의 어떠한 지령 신호가 출력단으로 발생되면 스위칭 수단이 트랜지스터(TR)가 턴온 또는 턴 오프된다.Now, the operation will be described in detail. When a command signal from a CPU connected to an input terminal of a PLC is generated and a command signal from the CPU which has processed the same is generated at the output terminal, the switching means causes the transistor TR to turn on or turn on. Is off.

이대 트랜지스터(TR)를 통하여 정상적인 전원이 인가되는 경우에는 트랜지스터(TR)의 스위칭 작용에 의해 발생된 급격한 서지가 제1필터 수단(5)의 저항(R)과 캐패시터(C)를 통하여 조절되고 충전되므로 그 서지를 모두 흡수하게 된다. 따라서 PLC의 출력단과 부하(RL)를 보호 할수 있게 된다.When a normal power source is applied through the transistor TR, the sudden surge generated by the switching action of the transistor TR is controlled and charged through the resistor R and the capacitor C of the first filter means 5. As a result, all the surges are absorbed. Therefore, it is possible to protect PLC output stage and load (RL).

또한 부하(RL)쪽에서 역기전력이 발생할 경우에는 제2필터수단(7)의 다이오드 (D2)를 통하여 전류가 흐르게 되고 그 역기전력이 과도할대는 퓨우즈(F)가 융단되므로서 역시 PLC의 출력단과 부하(RL)를 보호할 수 있게 된다.In addition, when the counter electromotive force occurs on the load RL side, current flows through the diode D2 of the second filter means 7, and when the reverse electromotive force is excessive, the fuse F is melted, and the output terminal and the load of the PLC (RL) can be protected.

이상으로 상기 설명한 바와같이, 종래의 PLC의 출력이 외부의 오결선이나 서지로 부터 보호 받지 못하던 것을 본 고안에 따른 구성을 채택하므로써 오결선이나 서지로부터 PLC외부의 부하와 더불어 PLC출력단 회호를 동시에 보호하며 부품의 파손 방지 및 안정성을 도모할 수 있는 효과가 있다.As described above, by adopting the configuration according to the present invention that the output of the conventional PLC is not protected from an external wrong wiring or surge, the PLC output terminal signal is protected simultaneously with the external load of the PLC from the wrong wiring or surge. It has the effect of preventing damage and stability of parts.

Claims (1)

PLC의 출력단에 접속된 부하에 병렬로 접속된 다이오드를 포함하는 PLC의 부하보호 회로에 있어서, PLC 출력단의 급속한 전원변동에 기인한 서지현상과 부하에서 발생하는 역기전력을 방지하기 위하여, PLC의 양 출력단에 각기 병렬로 접속된 직렬의 저항(R)과 캐패시터(C)로 구성된 제1필터수단(5) 및; 직렬의 다이오드(D)와 퓨우즈 (F)를 구성된 제2필터 수단(7)을 포함하는 것을 특징으로 하는 PLC의 출력단 및 그의부하 보호회로.In a load protection circuit of a PLC including a diode connected in parallel to a load connected to the output terminal of the PLC, in order to prevent surge phenomenon caused by rapid power fluctuations in the PLC output terminal and back electromotive force occurring in the load, both output terminals of the PLC First filter means (5) comprising a resistor (R) and a capacitor (C) in series connected in parallel to each other; And a second filter means (7) comprising a series of diodes (D) and fuses (F) in series and a load protection circuit thereof.
KR2019890019951U 1989-12-27 1989-12-27 Surge protective circuit KR920000251Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019890019951U KR920000251Y1 (en) 1989-12-27 1989-12-27 Surge protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019890019951U KR920000251Y1 (en) 1989-12-27 1989-12-27 Surge protective circuit

Publications (2)

Publication Number Publication Date
KR910013142U KR910013142U (en) 1991-07-30
KR920000251Y1 true KR920000251Y1 (en) 1992-01-15

Family

ID=19294005

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019890019951U KR920000251Y1 (en) 1989-12-27 1989-12-27 Surge protective circuit

Country Status (1)

Country Link
KR (1) KR920000251Y1 (en)

Also Published As

Publication number Publication date
KR910013142U (en) 1991-07-30

Similar Documents

Publication Publication Date Title
US4186418A (en) Overvoltage protected integrated circuit network, to control current flow through resistive or inductive loads
EP1356524B1 (en) Esd protection devices
CA1211789A (en) Electronic circuit breaker
US5014156A (en) Fused electrical safety barrier for protection of an electrical load placed in a potentially hazardous location
EP0622943A1 (en) Power management circuit for a subscriber line interface circuit
US3365617A (en) Protective means for electrical circuits
US5229909A (en) Surge suppression and fault containment circuit and packaging therefor
KR920000251Y1 (en) Surge protective circuit
US4181921A (en) Harmonic distortion attenuator
KR930010605B1 (en) Protecting circuit for a integrated circuit
JPH05504459A (en) Device that protects DC distribution buses during power supply
KR100195527B1 (en) Circuit for protection against negative overvoltage across the power supply of an integrated curcuit comprising a power device with a related control circuit
CN2185481Y (en) DC solid relay with overcurrent protection
KR970001861Y1 (en) Load protection device
JPS58162085A (en) Protecting circuit
GB2138644A (en) Power Transistor Protection
SU1238047A1 (en) Versions of multichannel power source with protection
KR900009468Y1 (en) Overload protective circuit
JPH01185128A (en) Self-reset current limiter
KR900008031Y1 (en) Computer protecting circuit in monitor-off
KR860002286Y1 (en) Overvoltage protective circuit
KR890006235Y1 (en) Power switching circuits
SU1023509A2 (en) Power transistor switch protecting device
SU924787A1 (en) Protection device
SU434616A1 (en) DEVICE PROTECTION OF OUTPUT CASCADE OF MASTERTRADING AMPLIFIER FROM SHORT CIRCUIT IN A LINE

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
NORF Unpaid initial registration fee