JPS6459517A - Battery charging circuit for memory backup - Google Patents
Battery charging circuit for memory backupInfo
- Publication number
- JPS6459517A JPS6459517A JP62217670A JP21767087A JPS6459517A JP S6459517 A JPS6459517 A JP S6459517A JP 62217670 A JP62217670 A JP 62217670A JP 21767087 A JP21767087 A JP 21767087A JP S6459517 A JPS6459517 A JP S6459517A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- resistor
- bat
- several hours
- time
- 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
Landscapes
- Power Sources (AREA)
Abstract
PURPOSE:To charge a secondary battery for memory backup fully in a short time and to guarantee the service life of the battery, by varying the charging current of the secondary battery. CONSTITUTION:A control circuit 3 closes a switch SW only for several hours only at the time of initializing the said system. At this time, the charging current of the battery BAT is increased compared with a case where charging is performed via a resistor R1 since the resistor R1 and a resistor R2 are connected in parallel. By setting the value of the resistor R2 so as to be charged full within the several hours, the BAT is charged fully in the several hours after initialization. Furthermore, after the lapse of a prescribed time, a battery circuit opens the SW, and the charging current to the BAT is decreased, and a trickle charging state is generated, then, the service life of the battery can be secured.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62217670A JPS6459517A (en) | 1987-08-31 | 1987-08-31 | Battery charging circuit for memory backup |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62217670A JPS6459517A (en) | 1987-08-31 | 1987-08-31 | Battery charging circuit for memory backup |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6459517A true JPS6459517A (en) | 1989-03-07 |
Family
ID=16707880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62217670A Pending JPS6459517A (en) | 1987-08-31 | 1987-08-31 | Battery charging circuit for memory backup |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6459517A (en) |
-
1987
- 1987-08-31 JP JP62217670A patent/JPS6459517A/en active Pending
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