Apparatus for checking the operational status of an electronic s

Details Apparatus for checking the operational status of an electronic s Apparatus for checking the operational status of an electronic s

1980-09-08

1981-09-22

Adams, Russell E.

354289, G03B 1502

Patent

active

042906776

ABSTRACT:
A battery check apparatus for an electronic strobe flash unit automatically indicates the charge condition of a battery under load. The electronic strobe flash unit includes means for charging a storage capacitor. During the charging process, the time needed to charge the capacitor to a relatively small predetermined fraction of its maximum voltage is compared with a predetermined reference time, which is short in comparison with the usual total charging time of the capacitor. An electronic indicator is then controlled in response to the result of this comparison to provide a visual indication of the charge condition of the battery, well in advance of the time required to charge the capacitor fully.

REFERENCES:
patent: 3743931 (1973-07-01), Brodhacker
patent: 3810212 (1974-05-01), Biber
patent: 3979657 (1976-09-01), Yorksie
patent: 4001639 (1977-01-01), Biber
patent: 4259615 (1981-03-01), Kashihara et al.

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