JPH02156721A - Short-circuiting protection circuit - Google Patents

Short-circuiting protection circuit

Info

Publication number
JPH02156721A
JPH02156721A JP63309925A JP30992588A JPH02156721A JP H02156721 A JPH02156721 A JP H02156721A JP 63309925 A JP63309925 A JP 63309925A JP 30992588 A JP30992588 A JP 30992588A JP H02156721 A JPH02156721 A JP H02156721A
Authority
JP
Japan
Prior art keywords
connecting point
current
base
flowing
switching element
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
JP63309925A
Other languages
Japanese (ja)
Other versions
JP2692206B2 (en
Inventor
Tsutomu Ajioka
Akio Matsumoto
Yasushi Matsuoka
Tomoshi Motouji
Hirobumi Endo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP63309925A priority Critical patent/JP2692206B2/en
Publication of JPH02156721A publication Critical patent/JPH02156721A/en
Application granted granted Critical
Publication of JP2692206B2 publication Critical patent/JP2692206B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches

Abstract

PURPOSE: To prevent destruction or deterioration in a switching element of an output circuit by limiting a current flowing to a switching element so that a current flowing to the switching element does not reach a 2nd prescribed value for a 1st prescribed time.
CONSTITUTION: A base of a current limit transistor(TR) 2 is connected to a connecting point B between a resistor R1 and a resistor R2, the collector is connected to a base of an output TR 1 at a connecting point C and the emitter is connected to a negative terminal of a power supply 6. when a current I1 flowing to the TR 1 increases and the level of the connecting point B rises, the TR 2 is transited in the conductive direction and a current flowing to the connecting point C, that is, a base of the TR 1 flows through the TR 2. Thus, the current I1 flowing to the TR 1 decreases and the level at the connecting point B is fed back negatively to the base of the TR 1.
COPYRIGHT: (C)1990,JPO&Japio
JP63309925A 1988-12-09 1988-12-09 Short circuit protection circuit Expired - Lifetime JP2692206B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63309925A JP2692206B2 (en) 1988-12-09 1988-12-09 Short circuit protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63309925A JP2692206B2 (en) 1988-12-09 1988-12-09 Short circuit protection circuit

Publications (2)

Publication Number Publication Date
JPH02156721A true JPH02156721A (en) 1990-06-15
JP2692206B2 JP2692206B2 (en) 1997-12-17

Family

ID=17998992

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63309925A Expired - Lifetime JP2692206B2 (en) 1988-12-09 1988-12-09 Short circuit protection circuit

Country Status (1)

Country Link
JP (1) JP2692206B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009201347A (en) * 2008-02-08 2009-09-03 Schneider Electric Industries Sas Control and protect system of negative logical output of automation equipment
EP2367288A1 (en) 2010-03-12 2011-09-21 Omron Corporation Sensor output IC and sensor device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5842570A (en) * 1981-09-01 1983-03-12 Sabun Kogyosho:Kk Residual yarn handling apparatus
JPS59198023A (en) * 1983-04-26 1984-11-09 Fuji Electric Co Ltd Overcurrent protection device of transistor
JPH02112316A (en) * 1988-10-20 1990-04-25 Kazunari Katayama Transistor switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5842570A (en) * 1981-09-01 1983-03-12 Sabun Kogyosho:Kk Residual yarn handling apparatus
JPS59198023A (en) * 1983-04-26 1984-11-09 Fuji Electric Co Ltd Overcurrent protection device of transistor
JPH02112316A (en) * 1988-10-20 1990-04-25 Kazunari Katayama Transistor switch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009201347A (en) * 2008-02-08 2009-09-03 Schneider Electric Industries Sas Control and protect system of negative logical output of automation equipment
EP2088674B1 (en) * 2008-02-08 2018-05-09 Schneider Electric Industries SAS Control and protection system for a low-side switch of an automation equipment
EP2367288A1 (en) 2010-03-12 2011-09-21 Omron Corporation Sensor output IC and sensor device
US8629710B2 (en) 2010-03-12 2014-01-14 Omron Corporation Sensor output IC and sensor device

Also Published As

Publication number Publication date
JP2692206B2 (en) 1997-12-17

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