COULOMETER CONTROLLED BATTERY CHARGERS
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Abstract
BATTERY CHARGING CIRCUITS USING A COULOMETER IN SERIES WITH THE BATTERY TO SENSE THE AMOUNT OF CHARGE GOING INTO OR OUT OF THE BATTERY. THE COULOMETER PROVIDES AN ABRUPT RISE IN VOLTAGE UPON PASSAGE OF A PREDETERMINED NET AMOUNT OF CHARGE THERETHROUGH, E.G. WHEN THE BATTERY HAS BEEN FULLY CHARGED. THIS VOLTAGE ACTUATES MEANS TO TERMINATE FURTHER CHARGING EITHER BY TRIPPING A RELAY OR DEACTIVATING A UNIJUNCTION OSCILLATOR WHICH NORMALLY PROVIDES GATING PULSES TO AN SCR IN SERIES WITH THE BATTERY AND COULOMETER. MEANS ARE PROVIDED FOR CAUSING A TIMED OVERCHARGE OR AN INTERMITTENT PULSE TYPE OF OVERCHARGE.
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