JPS54150663A - Stabilized power supply circuit - Google Patents

Stabilized power supply circuit

Info

Publication number
JPS54150663A
JPS54150663A JP5974978A JP5974978A JPS54150663A JP S54150663 A JPS54150663 A JP S54150663A JP 5974978 A JP5974978 A JP 5974978A JP 5974978 A JP5974978 A JP 5974978A JP S54150663 A JPS54150663 A JP S54150663A
Authority
JP
Japan
Prior art keywords
transistor
output voltage
error amplifier
alarm circuit
circuit
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
JP5974978A
Other languages
Japanese (ja)
Inventor
Toshio Fujii
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer 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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP5974978A priority Critical patent/JPS54150663A/en
Publication of JPS54150663A publication Critical patent/JPS54150663A/en
Pending legal-status Critical Current

Links

Landscapes

  • Stand-By Power Supply Arrangements (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE: To eliminate the infuence of the scatter in the properties of circuit elements upon an alarm circuit and raise its accuracy, by detecting that a detected current of an error amplifier circuit is cut off when an output voltage has exceeded a predetermined level and then cutting off the output voltage by the alarm circuit.
CONSTITUTION: A reference voltage produced by a Zener diode Dz and the output voltage Vo are applied to the error amplifier circuit consisting of transistors Tr11, Tr14 and resistors R12, R15. The operating point of a transistor Tr13 is changed depending on the deviation output of the error amplifier circuit to stabilize the output voltage Vo. The alarm circuit consisting of transistors Tr15, Tr16 is provided for the output voltage. When the output voltage Vo falls below the predetermined level, the collector current of the transistor Tr14 decreases but the collector current of the transistor Tr14 increases. When the collector current of the transistor Tr14 decreases to a predetermined value, the transistor Tr14 is turned off. As a result, the transistor Tr16, Tr15 are turned off and the current supplied to the resistor R15 becomes zero, namely the power is cut off. The accuracy of the alarm circuit is thus raised.
COPYRIGHT: (C)1979,JPO&Japio
JP5974978A 1978-05-19 1978-05-19 Stabilized power supply circuit Pending JPS54150663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5974978A JPS54150663A (en) 1978-05-19 1978-05-19 Stabilized power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5974978A JPS54150663A (en) 1978-05-19 1978-05-19 Stabilized power supply circuit

Publications (1)

Publication Number Publication Date
JPS54150663A true JPS54150663A (en) 1979-11-27

Family

ID=13122190

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5974978A Pending JPS54150663A (en) 1978-05-19 1978-05-19 Stabilized power supply circuit

Country Status (1)

Country Link
JP (1) JPS54150663A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61267808A (en) * 1985-04-15 1986-11-27 Makoto Aso Stabilized power supply device
JPH0537602U (en) * 1991-10-29 1993-05-21 三桜工業株式会社 Tube mounting device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492267U (en) * 1972-04-07 1974-01-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492267U (en) * 1972-04-07 1974-01-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61267808A (en) * 1985-04-15 1986-11-27 Makoto Aso Stabilized power supply device
JPH0537602U (en) * 1991-10-29 1993-05-21 三桜工業株式会社 Tube mounting device

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