Showing papers on "State of charge published in 1969"
Patent•
23 May 1969
TL;DR: In this paper, a variable reference voltage is derived across a resistor from a constant current device whose current may be controlled and this derived reference voltage are compared with the terminal voltage existing across the battery being charged, the result of this comparison causing the charging current to be switched off until the battery voltage drops below the reference voltage.
Abstract: A battery charger more particularly for use in charging batteries of the nickel-cadmium type in order to avoid the undesired effects caused by overcharging, wherein a variable reference voltage is derived across a resistor from a constantcurrent device whose current may be controlled and this derived reference voltage is compared with the terminal voltage existing across the battery being charged, the result of this comparison causing the charging current to be switched off until the battery voltage drops below the reference voltage, whereby the state of charge of the battery is sensed through the ON/OFF ratio of the charging current and appropriate adjustments may be made to the reference voltage in order to achieve a substantially complete charging of the battery in the minimum time without any overcharging occuring.
19 citations