JPS54124248A - Constant-voltage circuit with reset signal generating circuit - Google Patents

Constant-voltage circuit with reset signal generating circuit

Info

Publication number
JPS54124248A
JPS54124248A JP3186478A JP3186478A JPS54124248A JP S54124248 A JPS54124248 A JP S54124248A JP 3186478 A JP3186478 A JP 3186478A JP 3186478 A JP3186478 A JP 3186478A JP S54124248 A JPS54124248 A JP S54124248A
Authority
JP
Japan
Prior art keywords
zener
reset signal
voltage
transistor
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
JP3186478A
Other languages
Japanese (ja)
Inventor
Mamoru Tazawa
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP3186478A priority Critical patent/JPS54124248A/en
Publication of JPS54124248A publication Critical patent/JPS54124248A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To generate a reliable reset signal using a simple construction, by controlling a transistor for generating a reset signal using Zener current, a condenser and a resistance used in a constant-voltage circuit.
CONSTITUTION: When an electric source voltage Vin is energized, an electric potential of a condenser C2 is elevated through a resistance R2, and an electric potential of a base of a controlling transistor Tr1 is elevated to provide an output voltage Vout which is approximately equal to the electric source voltage Vin. When the electric source voltage is further elevated to reach a Zener voltage Vz of a Zener diode ZD, Zener current flows to a transistor Tr2 to suppress further elevation of the electric potential of the condenser C2, so that the output voltage Vout is remained approximately equal to the Zener voltage Vz. When the electric source voltage is lowered below the Zener voltage Vz, the Zener current passing through the Zener diode ZD is cut so that the transistor Tr2 for generating a reset signal becomes nonconductive and generates a reset signal as shown in the drawing by a dotted line.
COPYRIGHT: (C)1979,JPO&Japio
JP3186478A 1978-03-20 1978-03-20 Constant-voltage circuit with reset signal generating circuit Pending JPS54124248A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3186478A JPS54124248A (en) 1978-03-20 1978-03-20 Constant-voltage circuit with reset signal generating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3186478A JPS54124248A (en) 1978-03-20 1978-03-20 Constant-voltage circuit with reset signal generating circuit

Publications (1)

Publication Number Publication Date
JPS54124248A true JPS54124248A (en) 1979-09-27

Family

ID=12342907

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3186478A Pending JPS54124248A (en) 1978-03-20 1978-03-20 Constant-voltage circuit with reset signal generating circuit

Country Status (1)

Country Link
JP (1) JPS54124248A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS573115A (en) * 1980-06-06 1982-01-08 Nippon Columbia Co Ltd Detecting circuit for output voltage of constant-voltage circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS573115A (en) * 1980-06-06 1982-01-08 Nippon Columbia Co Ltd Detecting circuit for output voltage of constant-voltage circuit

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