JPS5582083A - Electronic clock unit - Google Patents
Electronic clock unitInfo
- Publication number
- JPS5582083A JPS5582083A JP15603478A JP15603478A JPS5582083A JP S5582083 A JPS5582083 A JP S5582083A JP 15603478 A JP15603478 A JP 15603478A JP 15603478 A JP15603478 A JP 15603478A JP S5582083 A JPS5582083 A JP S5582083A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- clock
- power failure
- restoration
- 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
Abstract
PURPOSE: To prevent the malfunction in the clock circut with smaller back up power supply capacity, by supplying the back up power only to the clock circuit via the switch circuit and feeding normal voltage to the clock control circuit at the restoration of power failure.
CONSTITUTION: When the power supply voltage is lowered less than the sum of the Zener voltage of the Zener diode 5 connected to the base of the transistor T of the power failure detector 5 and the voltage between the base and emitter of the transistor T at power failure, the voltage of the control terminal C is in low level and the switch circuit 4 is in interruption state. Thus, the power is fed from the back up power supply 2 to the electronic clock circuit 2 only interrupted from the clock control circuit 3. At the restoration of power failure, the terminal C voltage of the circuit 4 is at H level via the circuit 5 at the power failure restoration, the circuit 4 is conductive, and the circuit 3 performs normal operation when reaching the specified voltage, and the circuit 2 is controlled with the control signal of the circuit 3. Accordingly, the back up power supply is taken as small capacity and the clock unit not causing malfunction even at the restoration of power failure can be obtained. Further, this is also true when the switch circuit and the clock control circuit are controlled by opening the delay circuit.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15603478A JPS5582083A (en) | 1978-12-15 | 1978-12-15 | Electronic clock unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15603478A JPS5582083A (en) | 1978-12-15 | 1978-12-15 | Electronic clock unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5582083A true JPS5582083A (en) | 1980-06-20 |
JPS6134634B2 JPS6134634B2 (en) | 1986-08-08 |
Family
ID=15618863
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15603478A Granted JPS5582083A (en) | 1978-12-15 | 1978-12-15 | Electronic clock unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5582083A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59138979A (en) * | 1983-01-31 | 1984-08-09 | Matsushita Electric Works Ltd | Master and slave clock device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR880002575Y1 (en) * | 1985-06-26 | 1988-07-14 | 주식회사 금성사 | Reel-driving device for a video cassette recorder |
JPH01158660A (en) * | 1987-12-15 | 1989-06-21 | Canon Inc | Magnetic recording and reproducing device |
-
1978
- 1978-12-15 JP JP15603478A patent/JPS5582083A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59138979A (en) * | 1983-01-31 | 1984-08-09 | Matsushita Electric Works Ltd | Master and slave clock device |
Also Published As
Publication number | Publication date |
---|---|
JPS6134634B2 (en) | 1986-08-08 |
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