JPS54120847A - Protective equipment for electronic circuit - Google Patents
Protective equipment for electronic circuitInfo
- Publication number
- JPS54120847A JPS54120847A JP2765478A JP2765478A JPS54120847A JP S54120847 A JPS54120847 A JP S54120847A JP 2765478 A JP2765478 A JP 2765478A JP 2765478 A JP2765478 A JP 2765478A JP S54120847 A JPS54120847 A JP S54120847A
- Authority
- JP
- Japan
- Prior art keywords
- current limiter
- power source
- circuitry
- zener
- zener diode
- 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
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
PURPOSE: To protect the electronic circuitry against the erroeous connection of power source and the overvoltage by utilizing a Zener diode simultaneously as a current limiter.
CONSTITUTION: Positive power source 5 and negative power source 6 are connected through current limiter 7 to the electronic circuitry 9, then Zener diodes ZD1, ZD2 are connected between each input terminal A, B, C while Zenor diodes ZD3, ZD4 are connected between input terminal B and output terminal D. When a voltage exceeding over Zener voltage is applied on the circuitry 9, Zener diode ZD1 or ZD2 conducts to supply overcurrent for functioning the current limiter 7 to isolate the power sources 5, 6 from the circuitry. When reverse directional voltage is applied on the circuitry 9, current flows in forward direction through Zener diode ZD1 or ZD2 to function the current limiter 7. Even when the power source is connected erronously to the output terminal D, the current limiter 7 functions through the function of Zener diodes ZD3, ZD4.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2765478A JPS54120847A (en) | 1978-03-13 | 1978-03-13 | Protective equipment for electronic circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2765478A JPS54120847A (en) | 1978-03-13 | 1978-03-13 | Protective equipment for electronic circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54120847A true JPS54120847A (en) | 1979-09-19 |
Family
ID=12226902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2765478A Pending JPS54120847A (en) | 1978-03-13 | 1978-03-13 | Protective equipment for electronic circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54120847A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5713927A (en) * | 1980-06-27 | 1982-01-25 | Nippon Telegraph & Telephone | Overvoltage protecting circuit |
JPS58115835U (en) * | 1982-02-01 | 1983-08-08 | 株式会社田村電機製作所 | Protection circuits for devices using electronic components |
JPS60131033U (en) * | 1984-02-07 | 1985-09-02 | 株式会社サンコ−シャ | computer equipment |
JP2022531857A (en) * | 2019-05-02 | 2022-07-12 | デーン エスエー プルス ツェオー カーゲー | Asymmetric surge protection devices, DC circuit configurations, and DC networks |
-
1978
- 1978-03-13 JP JP2765478A patent/JPS54120847A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5713927A (en) * | 1980-06-27 | 1982-01-25 | Nippon Telegraph & Telephone | Overvoltage protecting circuit |
JPS58115835U (en) * | 1982-02-01 | 1983-08-08 | 株式会社田村電機製作所 | Protection circuits for devices using electronic components |
JPS60131033U (en) * | 1984-02-07 | 1985-09-02 | 株式会社サンコ−シャ | computer equipment |
JPH036137Y2 (en) * | 1984-02-07 | 1991-02-15 | ||
JP2022531857A (en) * | 2019-05-02 | 2022-07-12 | デーン エスエー プルス ツェオー カーゲー | Asymmetric surge protection devices, DC circuit configurations, and DC networks |
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