JPS5572223A - Power circuit - Google Patents

Power circuit

Info

Publication number
JPS5572223A
JPS5572223A JP14692178A JP14692178A JPS5572223A JP S5572223 A JPS5572223 A JP S5572223A JP 14692178 A JP14692178 A JP 14692178A JP 14692178 A JP14692178 A JP 14692178A JP S5572223 A JPS5572223 A JP S5572223A
Authority
JP
Japan
Prior art keywords
voltage
capacitor
rectified
output
zener diode
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.)
Granted
Application number
JP14692178A
Other languages
Japanese (ja)
Other versions
JPS6248460B2 (en
Inventor
Hideyuki Shirokura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP14692178A priority Critical patent/JPS5572223A/en
Publication of JPS5572223A publication Critical patent/JPS5572223A/en
Publication of JPS6248460B2 publication Critical patent/JPS6248460B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To obtain sufficient voltage holding time by a capacitor of small capacity by discharging charges accumulated in another rectifier circuit by connecting to a rectification part on detection of a power failure, as to a power circuit of a microcomputer, etc.
CONSTITUTION: Once an alternating-current input power supply is connected to transformer 1, it is rectified by rectification part 2 composed of diodes D1 and D2 and then applied to serial control part 3 to obtain as a reference voltage an output voltage by resistance R1 and Zener diode ZD1. Comparator circuit 4 compares a charging voltage rectified by capacitor C1 with a Zener voltage across Zener diode ZD2 and when the rectified voltage falls due to a power failure, transistors Tr2 and Tr3 turns OFF and ON respectively to turn ON transistor Tr4 of switch part 6, and consequently the potential of capacitor C2 charged by the voltage obtained by rectifying a high secondary voltage is applied to serial control part 3, so that the output of output terminal 7 will be held for a long time.
COPYRIGHT: (C)1980,JPO&Japio
JP14692178A 1978-11-27 1978-11-27 Power circuit Granted JPS5572223A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14692178A JPS5572223A (en) 1978-11-27 1978-11-27 Power circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14692178A JPS5572223A (en) 1978-11-27 1978-11-27 Power circuit

Publications (2)

Publication Number Publication Date
JPS5572223A true JPS5572223A (en) 1980-05-30
JPS6248460B2 JPS6248460B2 (en) 1987-10-14

Family

ID=15418572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14692178A Granted JPS5572223A (en) 1978-11-27 1978-11-27 Power circuit

Country Status (1)

Country Link
JP (1) JPS5572223A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55176045U (en) * 1979-06-04 1980-12-17
JPS5843013A (en) * 1981-09-04 1983-03-12 Matsushita Electric Ind Co Ltd Maintaining circuit of power supply voltage
JPS58119732A (en) * 1982-01-08 1983-07-16 松下電器産業株式会社 Power source circuit
JPS58159029U (en) * 1982-04-20 1983-10-24 パイオニア株式会社 Memory information display device
JPS61234411A (en) * 1985-04-10 1986-10-18 Matsushita Electric Ind Co Ltd Power supply circuit
US4733158A (en) * 1986-08-21 1988-03-22 Datametrics Corporation Control circuit for tap-switching power supplies and multi-tap transformers
JPH0253238U (en) * 1988-10-05 1990-04-17
JPH0497440U (en) * 1991-04-26 1992-08-24
EP0669704A2 (en) * 1994-02-23 1995-08-30 Koninklijke Philips Electronics N.V. Switched-mode power supply for connection to a direct voltage source and for generating at least one regulated d.c. output voltage, and apparatus comprising such a switched-mode power supply
DE102011117387B4 (en) * 2011-10-28 2020-10-01 Minebea Mitsumi Inc. Power supply

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2725057B2 (en) * 1989-06-20 1998-03-09 ファナック株式会社 Switching power supply and adapter for switching power supply

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55176045U (en) * 1979-06-04 1980-12-17
JPS5843013A (en) * 1981-09-04 1983-03-12 Matsushita Electric Ind Co Ltd Maintaining circuit of power supply voltage
JPH0320974B2 (en) * 1982-01-08 1991-03-20 Matsushita Electric Ind Co Ltd
JPS58119732A (en) * 1982-01-08 1983-07-16 松下電器産業株式会社 Power source circuit
JPH0454504Y2 (en) * 1982-04-20 1992-12-21
JPS58159029U (en) * 1982-04-20 1983-10-24 パイオニア株式会社 Memory information display device
JPS61234411A (en) * 1985-04-10 1986-10-18 Matsushita Electric Ind Co Ltd Power supply circuit
US4733158A (en) * 1986-08-21 1988-03-22 Datametrics Corporation Control circuit for tap-switching power supplies and multi-tap transformers
JPH0253238U (en) * 1988-10-05 1990-04-17
JPH0497440U (en) * 1991-04-26 1992-08-24
EP0669704A2 (en) * 1994-02-23 1995-08-30 Koninklijke Philips Electronics N.V. Switched-mode power supply for connection to a direct voltage source and for generating at least one regulated d.c. output voltage, and apparatus comprising such a switched-mode power supply
EP0669704A3 (en) * 1994-02-23 1996-07-31 Philips Electronics Nv Switched-mode power supply for connection to a direct voltage source and for generating at least one regulated d.c. output voltage, and apparatus comprising such a switched-mode power supply.
DE102011117387B4 (en) * 2011-10-28 2020-10-01 Minebea Mitsumi Inc. Power supply

Also Published As

Publication number Publication date
JPS6248460B2 (en) 1987-10-14

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