JPH0374026U - - Google Patents
Info
- Publication number
- JPH0374026U JPH0374026U JP13544989U JP13544989U JPH0374026U JP H0374026 U JPH0374026 U JP H0374026U JP 13544989 U JP13544989 U JP 13544989U JP 13544989 U JP13544989 U JP 13544989U JP H0374026 U JPH0374026 U JP H0374026U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- ram
- secondary battery
- stopped
- power supply
- 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
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の一実施例による回路の構成図
、第２図は本考案にかかる２次電池の電圧監視手
段の構成図である。
１，５……トランジスタ、２，６Ａ，６Ｂ，７
Ａ，７Ｂ……ダイオード、３……電気二重層コン
デンサ、４……２次電池、９……コンパレータ。
FIG. 1 is a block diagram of a circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a secondary battery voltage monitoring means according to the present invention. 1, 5...transistor, 2, 6A, 6B, 7
A, 7B...Diode, 3...Electric double layer capacitor, 4...Secondary battery, 9...Comparator.
Claims (1)
ているデータを保存するためのメモリ内容保存回
路において、前記ＲＡＭへの給電時に充電が可能
であり、前記給電停止時に前記ＲＡＭに格納され
ているデータを保存するために放電される電気二
重層コンデンサおよび２次電池と、該２次電池の
電圧を監視する電圧監視手段と、該電圧監視手段
により前記２次電池の電圧が前記ＲＡＭに格納さ
れているデータを保存するに必要な電圧以下とな
つたことが識別されたときにのみ前記２次電池の
充電を許可する手段とを設けたことを特徴とする
メモリ内容保存回路。 In a memory content storage circuit for saving data stored in the RAM when power supply to the RAM is stopped, charging is possible when power is supplied to the RAM, and the data stored in the RAM is saved when power supply is stopped. An electric double layer capacitor and a secondary battery that are discharged for storage, a voltage monitoring means for monitoring the voltage of the secondary battery, and a voltage of the secondary battery stored in the RAM by the voltage monitoring means. A memory content storage circuit comprising: means for permitting charging of the secondary battery only when it is determined that the voltage has fallen below a voltage necessary for storing data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13544989U JPH0374026U (en) | 1989-11-22 | 1989-11-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13544989U JPH0374026U (en) | 1989-11-22 | 1989-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0374026U true JPH0374026U (en) | 1991-07-25 |
Family
ID=31682717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13544989U Pending JPH0374026U (en) | 1989-11-22 | 1989-11-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0374026U (en) |
-
1989
- 1989-11-22 JP JP13544989U patent/JPH0374026U/ja active Pending