Battery voltage detection device using pulse width modulation co

Details Battery voltage detection device using pulse width modulation co Battery voltage detection device using pulse width modulation co

1995-09-01

1997-06-17

Perkey, W. B.

Photography

Having camera indicator

Nonmechanical visual display

396301, 340636, G03B 1718, G01R 1902

Patent

active

056406266

ABSTRACT:
A battery voltage detection system, suitable for a photographic device, having a battery power source. The battery voltage detection system includes a circuit to generate varying periodic signals, such as PWM control signals, and a battery voltage detection device to measure the battery voltage a plurality of times within a predetermined time period and to detect the battery voltage based on the plural battery voltage measurements. The battery voltage detection device performs the plural measurements of the battery voltage during the generation of the varying periodic signals. The plural measurements are combined by taking an average value or a root mean square value of the battery measurements to determined the battery voltage. The battery voltage detected by the battery voltage detection device is then compared with a predetermined standard value to determined the state of the battery.

REFERENCES:
patent: 5142233 (1992-08-01), Serita
patent: 5268845 (1993-12-01), Startup et al.

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