Title:
POWER SUPPLY VOLTAGE CHECKING CIRCUIT
Document Type and Number:
Japanese Patent JPS5571128
Kind Code:
A
Abstract:
A voltage checking circuit for checking a power source battery whose terminal voltage changes with time at an early stage subsequent to closing the battery load circuit. The checking circuit correctly checks whether the battery is effective or ineffective even while the terminal voltage is changing. To this end, there is provided a voltage generating circuit which is responsive to the change of the power source battery voltage and generates a constant output when a critical effective battery that shows a critical voltage at its steady state, is in use. The voltage generating circuit generates a voltage other than the constant voltage with a battery other than the critical effective battery. Thus, the power source battery is checked in accordance with the output of the voltage generating circuit.
Inventors:
TOMINAGA SHINJI
Application Number:
JP14360278A
Publication Date:
May 29, 1980
Filing Date:
November 20, 1978
Export Citation:
Assignee:
MINOLTA CAMERA KK
International Classes:
H02J7/00; G01R31/36; G03B7/26; H02H3/24; (IPC1-7): G03B7/26; H02H3/24; H02H7/18
Domestic Patent References:
| JPS5026133A | 1975-03-19 | |||
| JPS4324858Y1 | 1968-10-18 |