JPS5572223A - Power circuit - Google Patents
Power circuitInfo
- 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
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
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)
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)
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 |
-
1978
- 1978-11-27 JP JP14692178A patent/JPS5572223A/en active Granted
Cited By (13)
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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