JPS54108250A - Low voltage detecting circuit - Google Patents

Low voltage detecting circuit

Info

Publication number
JPS54108250A
JPS54108250A JP1533878A JP1533878A JPS54108250A JP S54108250 A JPS54108250 A JP S54108250A JP 1533878 A JP1533878 A JP 1533878A JP 1533878 A JP1533878 A JP 1533878A JP S54108250 A JPS54108250 A JP S54108250A
Authority
JP
Japan
Prior art keywords
voltage
condenser
driving
dropped
electric source
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
JP1533878A
Other languages
Japanese (ja)
Inventor
Teruo Tonomura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP1533878A priority Critical patent/JPS54108250A/en
Publication of JPS54108250A publication Critical patent/JPS54108250A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To ensure detecting operation and miniaturize the device, without prepara tion of an auxiliary electric source, by driving Zener diodes for voltage comparator and standard voltage with discharged current of a condenser, when voltage of AC input electric source is dropped or broken.
CONSTITUTION: When DC output voltage is dropped by voltage drop or breakage of AC input electric source 11 terminal voltage of smoothing condenser 23 is dropped, and instead of it, a condenser 36 for driving in low voltage detecting circuit is started to hold normal voltage. Reverse current to the smoothing condenser 23 in discharged current of the condenser 36 is prevented by diodes 37, and standard voltage of Zener diodes 32 for driving voltage of the voltage comparator 31 and standard voltage is held. Then, drop of DC output voltage Vdc is detected the by voltage comparatot 31, and the output transistors are cut off. Therefore, a relay 41 is held in non-driving state through the Zener diodes 42 or resistances, brake contact point is not braked, alarm is outputted, and load is protected from low voltage abnormality.
COPYRIGHT: (C)1979,JPO&Japio
JP1533878A 1978-02-15 1978-02-15 Low voltage detecting circuit Pending JPS54108250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1533878A JPS54108250A (en) 1978-02-15 1978-02-15 Low voltage detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1533878A JPS54108250A (en) 1978-02-15 1978-02-15 Low voltage detecting circuit

Publications (1)

Publication Number Publication Date
JPS54108250A true JPS54108250A (en) 1979-08-24

Family

ID=11885989

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1533878A Pending JPS54108250A (en) 1978-02-15 1978-02-15 Low voltage detecting circuit

Country Status (1)

Country Link
JP (1) JPS54108250A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5714633U (en) * 1980-06-19 1982-01-25
JPS57196826A (en) * 1981-05-27 1982-12-02 Nissin Electric Co Ltd Power source voltage decrease detecting circuit
DE3435057A1 (en) * 1984-09-25 1986-07-10 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover PROTECTIVE CIRCUIT AGAINST UNDERVOLTAGES IN THE VEHICLE VEHICLE
CN101707347A (en) * 2009-10-21 2010-05-12 海洋王照明科技股份有限公司 Undervoltage protection circuit and LED drive circuit
JPWO2018073892A1 (en) * 2016-10-18 2019-08-08 株式会社Ｆｕｊｉ Non-contact power feeding device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5714633U (en) * 1980-06-19 1982-01-25
JPS57196826A (en) * 1981-05-27 1982-12-02 Nissin Electric Co Ltd Power source voltage decrease detecting circuit
DE3435057A1 (en) * 1984-09-25 1986-07-10 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover PROTECTIVE CIRCUIT AGAINST UNDERVOLTAGES IN THE VEHICLE VEHICLE
CN101707347A (en) * 2009-10-21 2010-05-12 海洋王照明科技股份有限公司 Undervoltage protection circuit and LED drive circuit
JPWO2018073892A1 (en) * 2016-10-18 2019-08-08 株式会社Ｆｕｊｉ Non-contact power feeding device

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