Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1977-10-06
1979-07-31
Hickey, Robert J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 2, 340636, G08B 2100
Patent
active
041631862
ABSTRACT:
A state-of-charge indicator, powered by a battery to be monitored, compares a reference voltage level developed from the battery and a voltage proportional to that of the battery in a differential-type circuit employing a pair of transistors with common emitter load and each having a collector current activated annunciator; with a first annunciator being activated under conditions of battery voltage definitive of a "good" battery, both annunciators being activated for lower battery voltage indicative of a failing trend, only the second annunciator being activated for still lower battery voltage indicative of a "bad" battery, and neither annunciator being activated for still lower battery voltage indicative of a failed condition. The minimal current drain device is not adversely effected by voltage drop in wiring runs to the monitored battery, and may be self-contained within a plug-in unit for insertion into a vehicle cigarette lighter receptacle, or dashboard mounted, with non-critical length wiring run to the vehicle battery.
REFERENCES:
patent: 3832629 (1974-08-01), Cernek, Jr.
patent: 3921064 (1975-11-01), Mori et al.
Electronic Design, vol. 19, Sep. 13, 1974, p. 176, "Voltage Monitor Uses LED Indicators . . .," Moss.
Radio and Electronics Constructor, vol. 30, Feb. 1977, Jones, "Car Battery Monitor," pp. 425-427.
Popular Mechanics, Oct. 1977, Sandler, "Don't Electrocute Your Car Battery," pp. 68, 70, 190.
Hickey Robert J.
Kintzinger Warren H.
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