JPS56137729A - Insulation type transistor driving circuit - Google Patents
Insulation type transistor driving circuitInfo
- Publication number
- JPS56137729A JPS56137729A JP4035380A JP4035380A JPS56137729A JP S56137729 A JPS56137729 A JP S56137729A JP 4035380 A JP4035380 A JP 4035380A JP 4035380 A JP4035380 A JP 4035380A JP S56137729 A JPS56137729 A JP S56137729A
- Authority
- JP
- Japan
- Prior art keywords
- turns
- output transistor
- led11
- base
- driving circuit
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/795—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors
- H03K17/7955—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors using phototransistors
Landscapes
- Electronic Switches (AREA)
Abstract
PURPOSE:To insulate electrically the output transistor of an isolator from an output transistor controlling part, by using a DC/DC converter for a control power source which supplies electric power to a pin photodiode and the output transistor. CONSTITUTION:Light emitting LED11 turns of when input (a)10 to inverter 7 is at the high level and turns off when at the low level. The output light of LED11 is photodetected by pin photodiode 12. Then, a current flows to the base of output transistor TR13 of the isolator to turn on TR13. As LED11 turns off, the resistance value of diode 12 becomes infinite and the base current of TR13 is ceased, turning off TR13. Therefore, a base current is supplied from DC/DC converter 1 to the base of TR8 via resistance 4 and 8. Thus, TR8 turns on.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4035380A JPS56137729A (en) | 1980-03-31 | 1980-03-31 | Insulation type transistor driving circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4035380A JPS56137729A (en) | 1980-03-31 | 1980-03-31 | Insulation type transistor driving circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56137729A true JPS56137729A (en) | 1981-10-27 |
Family
ID=12578259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4035380A Pending JPS56137729A (en) | 1980-03-31 | 1980-03-31 | Insulation type transistor driving circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56137729A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05340460A (en) * | 1991-03-15 | 1993-12-21 | T H K Kk | Ball screw |
-
1980
- 1980-03-31 JP JP4035380A patent/JPS56137729A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05340460A (en) * | 1991-03-15 | 1993-12-21 | T H K Kk | Ball screw |
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