JPS6436206A - Reversal current output device - Google Patents
Reversal current output deviceInfo
- 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
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.
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) |
-
1987
- 1987-07-31 JP JP19216487A patent/JPH069325B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH069325B2 (en) | 1994-02-02 |
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