JPS6436206A - Reversal current output device - Google Patents

Reversal current output device

Info

Publication number
JPS6436206A
JPS6436206A JP19216487A JP19216487A JPS6436206A JP S6436206 A JPS6436206 A JP S6436206A JP 19216487 A JP19216487 A JP 19216487A JP 19216487 A JP19216487 A JP 19216487A JP S6436206 A JPS6436206 A JP S6436206A
Authority
JP
Japan
Prior art keywords
output
turned
operational amplifier
zener diode
photocoupler
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
JP19216487A
Other languages
Japanese (ja)
Other versions
JPH069325B2 (en
Inventor
Yasuo Nakai
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Electric Corp
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 Yokogawa Electric Corp filed Critical Yokogawa Electric Corp
Priority to JP19216487A priority Critical patent/JPH069325B2/en
Publication of JPS6436206A publication Critical patent/JPS6436206A/en
Publication of JPH069325B2 publication Critical patent/JPH069325B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Amplifiers (AREA)

Abstract

PURPOSE:To detect an output circuit open state with a simple circuit by providing a function detecting output interruption (open) and turning off an input current in a device receiving/giving a current signal. CONSTITUTION:The output interruption detection circuit OCD consists of a Zener diode ZD connected to an output terminal of an operational amplifier OP 2, a transistor(TR) Q3 turned on/off corresponding to the quantity of the Zener voltage Vz of the Zener diode ZD and a photocoupler PC driving a switch element S1 in response to the quantity of the Zener voltage Vz of the Zener diode ZD. Through the constitution above, in increasing the resistor RL of the operational amplifier OP2, the output power Io cannot be outputted and the output of the operational amplifier OP 2 is dropped suddenly as shown in figure A and when the level reaches Vz+Cbe or below, the TR Q3 is turned off. As a result, the switch element S1 is turned off via the photocoupler PC.
JP19216487A 1987-07-31 1987-07-31 Reversal current output device Expired - Lifetime JPH069325B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19216487A JPH069325B2 (en) 1987-07-31 1987-07-31 Reversal current output device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19216487A JPH069325B2 (en) 1987-07-31 1987-07-31 Reversal current output device

Publications (2)

Publication Number Publication Date
JPS6436206A true JPS6436206A (en) 1989-02-07
JPH069325B2 JPH069325B2 (en) 1994-02-02

Family

ID=16286752

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19216487A Expired - Lifetime JPH069325B2 (en) 1987-07-31 1987-07-31 Reversal current output device

Country Status (1)

Country Link
JP (1) JPH069325B2 (en)

Also Published As

Publication number Publication date
JPH069325B2 (en) 1994-02-02

Similar Documents

Publication Publication Date Title
KR910012851A (en) Integrated power level control and on / off function circuit
KR890012491A (en) receiving set
CA1061016A (en) Smoke sensing fire alarm
KR910007208A (en) Male Sensing Power-Down Circuit
DE59307119D1 (en) Solid state relay
US5376920A (en) Power fail detection circuit
JPS6436206A (en) Reversal current output device
KR910017734A (en) Electronic device
KR900004646Y1 (en) Loop current sensing circuit
CA1067215A (en) Smoke sensing fire alarm
KR860000367Y1 (en) Automatic display level change circuit
SU1493992A1 (en) Dc voltage stabilizer
KR920009033A (en) Discrete current source whose output decreases with increasing control voltage
JPS56161723A (en) Electronic switch
KR910018771A (en) Battery measuring device of shell electronic fuse
JPH0241744Y2 (en)
KR850001658Y1 (en) The warning circuit for gas combustion apparatus
SU1200315A1 (en) Multicell signalling device
KR900001523Y1 (en) Warning circuit at cable's seperating from monitor
JPS56164401A (en) Detecting and controlling circuit
SU1372239A1 (en) D.c.voltage drop indicator
JPH0410532U (en)
KR920022663A (en) Automatic reset system of microprocessor
JPS6480196A (en) Earth start detection circuit
KR920001211A (en) Zener diode measuring device