JPS54129443A - Automatic power supply switching circuit - Google Patents

Automatic power supply switching circuit

Info

Publication number
JPS54129443A
JPS54129443A JP3775178A JP3775178A JPS54129443A JP S54129443 A JPS54129443 A JP S54129443A JP 3775178 A JP3775178 A JP 3775178A JP 3775178 A JP3775178 A JP 3775178A JP S54129443 A JPS54129443 A JP S54129443A
Authority
JP
Japan
Prior art keywords
diode
voltage
secondary battery
rectified
load
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
JP3775178A
Other languages
Japanese (ja)
Other versions
JPS6248459B2 (en
Inventor
Tsuneaki Oka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3775178A priority Critical patent/JPS54129443A/en
Publication of JPS54129443A publication Critical patent/JPS54129443A/en
Publication of JPS6248459B2 publication Critical patent/JPS6248459B2/ja
Granted legal-status Critical Current

Links

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  • Stand-By Power Supply Arrangements (AREA)

Abstract

PURPOSE: To premit quick charging and prevent overcharging with a simple conconstruction of merely providing a constant voltage circuit on the rectified output side.
CONSTITUTION: A diode 32 is connected between an input terminal 23, to which a secondary battery 21 is connected, and an output terminal 33, a zener diode 37 and a diode 35 are connected between an input terminal 28, to which a rectified output 25 is coupled, and an input terminal 28, and a resistor 29 is connected between the terminals 23 and 28. Usually, the rectified output 25 is higher than the voltage of the secondary battery 25, and the battery 21 is charged through a resistor 29 while at the same time the rectified voltage is coupled through the diode 35 to the load. When the voltage of the secondary battery 23 exceeds the output voltage of the zener diode, the diode 32 is rendered conductive, so that the charging current to the battery 21 ceases. When the rectified voltage 25 is reduced to zero, the diode 35 is cut off, and current is supplied from the secondary battery 21 through the other diode 32 to the load. In this way, the application of voltage to the load and charging of the secondary battery from the rectified voltage side on one hand and prevention of overcharing of the battery and supply of current from the secondary battery to the load on the other hand are automatically switched over to one another depending upon the relations of voltages on various parts.
COPYRIGHT: (C)1979,JPO&Japio
JP3775178A 1978-03-31 1978-03-31 Automatic power supply switching circuit Granted JPS54129443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3775178A JPS54129443A (en) 1978-03-31 1978-03-31 Automatic power supply switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3775178A JPS54129443A (en) 1978-03-31 1978-03-31 Automatic power supply switching circuit

Publications (2)

Publication Number Publication Date
JPS54129443A true JPS54129443A (en) 1979-10-06
JPS6248459B2 JPS6248459B2 (en) 1987-10-14

Family

ID=12506170

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3775178A Granted JPS54129443A (en) 1978-03-31 1978-03-31 Automatic power supply switching circuit

Country Status (1)

Country Link
JP (1) JPS54129443A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58151835A (en) * 1982-03-04 1983-09-09 富士通株式会社 Charging circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531616U (en) * 1976-06-25 1978-01-09

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531616U (en) * 1976-06-25 1978-01-09

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58151835A (en) * 1982-03-04 1983-09-09 富士通株式会社 Charging circuit

Also Published As

Publication number Publication date
JPS6248459B2 (en) 1987-10-14

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