JPS54120847A - Protective equipment for electronic circuit - Google Patents

Protective equipment for electronic circuit

Info

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
Application number
JP2765478A
Other languages
Japanese (ja)
Inventor
Ryusuke Udagawa
Yoshihiro Kawamura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2765478A priority Critical patent/JPS54120847A/en
Publication of JPS54120847A publication Critical patent/JPS54120847A/en
Pending legal-status Critical Current

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
JP2765478A 1978-03-13 1978-03-13 Protective equipment for electronic circuit Pending JPS54120847A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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