JPS6423316A - Power supply back-up system - Google Patents
Power supply back-up systemInfo
- Publication number
- JPS6423316A JPS6423316A JP62180541A JP18054187A JPS6423316A JP S6423316 A JPS6423316 A JP S6423316A JP 62180541 A JP62180541 A JP 62180541A JP 18054187 A JP18054187 A JP 18054187A JP S6423316 A JPS6423316 A JP S6423316A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- voltage
- circuit
- input signals
- drops
- 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
Landscapes
- Power Sources (AREA)
Abstract
PURPOSE:To back up the voltage drop of a main power supply with use of an auxiliary power supply of a small capacity by quickly dropping the levels of all input signals of a control circuit consisting of a CMOS when the voltage of the main power supply drops. CONSTITUTION:A power supply monitor means 3 detects that the voltage of a main power supply 21 drops down to a prescribed level and changes quickly its output to a low level from a high level. While an AND means 4 supplies the AND of al input signals supplied to a control circuit 1 of a CMOS and the output of the means 3 to the circuit 1. Thus all input signals of the circuit 1 are quickly change to low levels from high levels when the voltage of the power supply 21 drops. As a result, the power supply current consumed by the circuit 1 can be reduced and therefore the capacity and the scale of an auxiliary power supply are also reduced. Then the power supply 22 of a small capacity can back up the voltage drop of the power supply 21.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62180541A JP2533126B2 (en) | 1987-07-20 | 1987-07-20 | Power backup method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62180541A JP2533126B2 (en) | 1987-07-20 | 1987-07-20 | Power backup method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6423316A true JPS6423316A (en) | 1989-01-26 |
JP2533126B2 JP2533126B2 (en) | 1996-09-11 |
Family
ID=16085075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62180541A Expired - Lifetime JP2533126B2 (en) | 1987-07-20 | 1987-07-20 | Power backup method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2533126B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5864700A (en) * | 1981-10-14 | 1983-04-18 | Nec Corp | Storage protecting circuit |
JPS6248136U (en) * | 1985-09-12 | 1987-03-25 |
-
1987
- 1987-07-20 JP JP62180541A patent/JP2533126B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5864700A (en) * | 1981-10-14 | 1983-04-18 | Nec Corp | Storage protecting circuit |
JPS6248136U (en) * | 1985-09-12 | 1987-03-25 |
Also Published As
Publication number | Publication date |
---|---|
JP2533126B2 (en) | 1996-09-11 |
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