JPS5582083A - Electronic clock unit - Google Patents

Electronic clock unit

Info

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
Application number
JP15603478A
Other languages
Japanese (ja)
Other versions
JPS6134634B2 (en
Inventor
Yuji Nakagawa
Akira Yasuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP15603478A priority Critical patent/JPS5582083A/en
Publication of JPS5582083A publication Critical patent/JPS5582083A/en
Publication of JPS6134634B2 publication Critical patent/JPS6134634B2/ja
Granted legal-status Critical Current

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
JP15603478A 1978-12-15 1978-12-15 Electronic clock unit Granted JPS5582083A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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