Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-02-12
1992-04-14
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
320 48, 324435, 354468, G08B 2100
Patent
active
051051800
ABSTRACT:
A light unit is combined with circuitry which monitors the charge level of a battery of the light unit or a video camera or camcorder connected to the light unit. With two lights of different wattages, three different constant loads can be applied while observing, in each case, LED indicators each deenergized at a certain voltage level, resulting in an accurate and reliable indication of charge level. The voltage levels are selectable in accordance with the type of battery being monitored and a bridge rectifier allows reversal of battery polarity.
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patent: 4660027 (1987-04-01), Davis
patent: 4792762 (1988-12-01), Shiina et al.
patent: 4906055 (1990-03-01), Horiuchi
patent: 4982220 (1991-01-01), Akasaka
Yagi Hideo
Yamada Masahiro
Asahi Research Corporation
Jackson Jill
Ng Jin F.
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