JPS5422550A - Overvoltage protective circuit - Google Patents

Overvoltage protective circuit

Info

Publication number
JPS5422550A
JPS5422550A JP8736577A JP8736577A JPS5422550A JP S5422550 A JPS5422550 A JP S5422550A JP 8736577 A JP8736577 A JP 8736577A JP 8736577 A JP8736577 A JP 8736577A JP S5422550 A JPS5422550 A JP S5422550A
Authority
JP
Japan
Prior art keywords
protective circuit
overvoltage protective
load
overvoltage
transistors
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
JP8736577A
Other languages
Japanese (ja)
Inventor
Makoto Fukushima
Akio Nakajima
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8736577A priority Critical patent/JPS5422550A/en
Publication of JPS5422550A publication Critical patent/JPS5422550A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To protect load from overvoltage breakdown by detecting the power voltage with zener diodes and transistors when it rises and immediately cutting off the transistor connected between the power source and load.
COPYRIGHT: (C)1979,JPO&Japio
JP8736577A 1977-07-22 1977-07-22 Overvoltage protective circuit Pending JPS5422550A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8736577A JPS5422550A (en) 1977-07-22 1977-07-22 Overvoltage protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8736577A JPS5422550A (en) 1977-07-22 1977-07-22 Overvoltage protective circuit

Publications (1)

Publication Number Publication Date
JPS5422550A true JPS5422550A (en) 1979-02-20

Family

ID=13912858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8736577A Pending JPS5422550A (en) 1977-07-22 1977-07-22 Overvoltage protective circuit

Country Status (1)

Country Link
JP (1) JPS5422550A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007142015A1 (en) * 2006-06-06 2007-12-13 Ricoh Company, Ltd. Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007142015A1 (en) * 2006-06-06 2007-12-13 Ricoh Company, Ltd. Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit
US7864495B2 (en) 2006-06-06 2011-01-04 Ricoh Company, Ltd. Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection circuit

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