JPS6485539A - Back-up power circuit - Google Patents
Back-up power circuitInfo
- Publication number
- JPS6485539A JPS6485539A JP24084887A JP24084887A JPS6485539A JP S6485539 A JPS6485539 A JP S6485539A JP 24084887 A JP24084887 A JP 24084887A JP 24084887 A JP24084887 A JP 24084887A JP S6485539 A JPS6485539 A JP S6485539A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- batteries
- voltage vcc
- telephone set
- power
- 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
Links
Abstract
PURPOSE:To make it possible to charge a battery for back-up with voltage operating a system by supplying specific voltage to every block. CONSTITUTION:DC power supply of the voltage Vcc of a power circuit 1 is supplied to a telephone set 14, a power failure detection circuit 10 switches a change-over switch 11 to a terminal (b) and the batteries 2 and 3 are put in a state of parallel connection, and DC power supply is applied to both. In the time of charging, Zener voltage of Zener diodes 6 and 7 is determined so that the voltage higher than 1/2 of the voltage Vcc operating the telephone set 14 is applied to the batteries 2 and 3, and it can be sufficiently charged with the voltage Vcc of the power circuit 1. When the power failure detection circuit 10 detects the fall of output voltage Vcc due to power failure and so forth at this state, the change-over switch 11 is connected to a terminal (a) to connect the batteries 2 and 3. The voltage Vcc generated from the batteries 2 and 3 connected in parallel is supplied to the telephone set 14 through the diode 9.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24084887A JPS6485539A (en) | 1987-09-28 | 1987-09-28 | Back-up power circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24084887A JPS6485539A (en) | 1987-09-28 | 1987-09-28 | Back-up power circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6485539A true JPS6485539A (en) | 1989-03-30 |
Family
ID=17065609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24084887A Pending JPS6485539A (en) | 1987-09-28 | 1987-09-28 | Back-up power circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6485539A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH053634A (en) * | 1991-06-27 | 1993-01-08 | Tokyo Electric Co Ltd | Battery charging and discharging circuit |
JPH055629A (en) * | 1990-10-01 | 1993-01-14 | Yaskawa Electric Corp | Method and device for backing up absolute value resolver |
JP2009055701A (en) * | 2007-08-27 | 2009-03-12 | Panasonic Corp | Power unit |
US8037331B2 (en) * | 2008-04-28 | 2011-10-11 | Dell Products L.P. | Energy efficient method to wake host system for charging battery powered portable devices via bus powered external i/o ports |
-
1987
- 1987-09-28 JP JP24084887A patent/JPS6485539A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH055629A (en) * | 1990-10-01 | 1993-01-14 | Yaskawa Electric Corp | Method and device for backing up absolute value resolver |
JPH053634A (en) * | 1991-06-27 | 1993-01-08 | Tokyo Electric Co Ltd | Battery charging and discharging circuit |
JP2009055701A (en) * | 2007-08-27 | 2009-03-12 | Panasonic Corp | Power unit |
US8037331B2 (en) * | 2008-04-28 | 2011-10-11 | Dell Products L.P. | Energy efficient method to wake host system for charging battery powered portable devices via bus powered external i/o ports |
US9128706B2 (en) | 2008-04-28 | 2015-09-08 | Dell Products L.P. | Device charging system |
US11146095B2 (en) | 2008-04-28 | 2021-10-12 | Dell Products L.P. | Device charging system |
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