JPS6423722A - Surge protector for power source circuit - Google Patents

Surge protector for power source circuit

Info

Publication number
JPS6423722A
JPS6423722A JP17679687A JP17679687A JPS6423722A JP S6423722 A JPS6423722 A JP S6423722A JP 17679687 A JP17679687 A JP 17679687A JP 17679687 A JP17679687 A JP 17679687A JP S6423722 A JPS6423722 A JP S6423722A
Authority
JP
Japan
Prior art keywords
voltage
point
potential
zener
current
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
JP17679687A
Other languages
Japanese (ja)
Inventor
Hironao Ishii
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP17679687A priority Critical patent/JPS6423722A/en
Publication of JPS6423722A publication Critical patent/JPS6423722A/en
Pending legal-status Critical Current

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  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To obtain a simple and inexpensive surge protector, by reducing allowable loss of a resistor and a Zener diode. CONSTITUTION:Upon application of a surge voltage VP at point A, potential at point B is cut through Zener voltage VZ. Potential at point C is a sum of base-emitter voltage VBE and a Zener voltage Y2. When the Zener voltage V2 is set at a level about 0.6-0.7V lower than the maximum input voltage of a voltage regulator 2, potential at point C does not exceed the maximum input voltage. Normally, consumption current in 5V system flows from point A through collector and emitter of a transistor 5, point C to the voltage regulator 2. Current level is subjected to limitation of collector current, but no trouble occurs in the consumption current of 5V system when the transistor is selected properly. Resistor 6 may have high resistance for feeding base consumption current of 5V system, and thereby allowable loss can be reduced.
JP17679687A 1987-07-15 1987-07-15 Surge protector for power source circuit Pending JPS6423722A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17679687A JPS6423722A (en) 1987-07-15 1987-07-15 Surge protector for power source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17679687A JPS6423722A (en) 1987-07-15 1987-07-15 Surge protector for power source circuit

Publications (1)

Publication Number Publication Date
JPS6423722A true JPS6423722A (en) 1989-01-26

Family

ID=16019992

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17679687A Pending JPS6423722A (en) 1987-07-15 1987-07-15 Surge protector for power source circuit

Country Status (1)

Country Link
JP (1) JPS6423722A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5312093A (en) * 1992-01-28 1994-05-17 Applied Power Inc. Vibration isolator with two pairs of fluid chambers with diagonal fluid communication
EP2051359A1 (en) 2007-10-09 2009-04-22 Mitsubishi Electric Corporation Power supply circuit and earth leakage circuit breaker using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5312093A (en) * 1992-01-28 1994-05-17 Applied Power Inc. Vibration isolator with two pairs of fluid chambers with diagonal fluid communication
EP2051359A1 (en) 2007-10-09 2009-04-22 Mitsubishi Electric Corporation Power supply circuit and earth leakage circuit breaker using the same

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