JPS5447687A - Current detection circuit - Google Patents
Current detection circuitInfo
- Publication number
- JPS5447687A JPS5447687A JP11336677A JP11336677A JPS5447687A JP S5447687 A JPS5447687 A JP S5447687A JP 11336677 A JP11336677 A JP 11336677A JP 11336677 A JP11336677 A JP 11336677A JP S5447687 A JPS5447687 A JP S5447687A
- Authority
- JP
- Japan
- Prior art keywords
- photo
- operational amplifier
- output
- light
- voltage
- 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.)
- Pending
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
PURPOSE: To readily obtain current read voltages even under high operating voltage near the dielectric strength of photo couplers by optically coupling the current path side to be measured and the voltage read voltage generating circuit side.
CONSTITUTION: The light emitting diode D1 of a first photo coupler P1 is connected to the output side of an output buffer B. The light thereof is received in a transistor T1 and is applied to the inversion output end of an operational amplifier Q4. The light emitting diode D2 of a second photo coupler P2 and an output resistance Rs are series-connected to the output side of the operational amplifier Q4 and the light thereof is received in a photo detecting transistor T2 and is applied to the non-inversion input of the operational amplifier Q4. Hence, a current read voltage VM is drawn out at both ends of the resistance Rs, by which the value of load current I0 may be measured. Since these are electrically isolated by the photo couplers, the maximum operating voltage may be considerably increased
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11336677A JPS5447687A (en) | 1977-09-22 | 1977-09-22 | Current detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11336677A JPS5447687A (en) | 1977-09-22 | 1977-09-22 | Current detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5447687A true JPS5447687A (en) | 1979-04-14 |
Family
ID=14610447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11336677A Pending JPS5447687A (en) | 1977-09-22 | 1977-09-22 | Current detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5447687A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5998369U (en) * | 1982-12-22 | 1984-07-03 | 株式会社小野測器 | ignition energy detector |
CN104407193A (en) * | 2014-12-12 | 2015-03-11 | 东莞市精诚电能设备有限公司 | Linear voltage sampling circuit |
-
1977
- 1977-09-22 JP JP11336677A patent/JPS5447687A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5998369U (en) * | 1982-12-22 | 1984-07-03 | 株式会社小野測器 | ignition energy detector |
CN104407193A (en) * | 2014-12-12 | 2015-03-11 | 东莞市精诚电能设备有限公司 | Linear voltage sampling circuit |
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