Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1986-08-20
1989-02-07
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 14, 320 48, H02J 704, G01R 1166
Patent
active
048034169
ABSTRACT:
A control device for a storage battery consists of a charge regulating loop including a circuit for supplying clock pulses having a variable frequency proportional to a battery charge and discharge current, a circuit for estimating an instantaneous capacity of the battery depending on a clock pulse up-down count, and a regulating circuit for recharging the battery from a mains or supply voltage as soon as the instantaneous capacity is equal to a first capacity substantially less than a maximum capacity of the battery. According to the invention, the frequency of the clock pulses depends also on at least one of the parameters relating to an energy efficiency of the battery and to a self-discharge current of the battery, so that these parameters are involved in estimating the instantaneous capacity. Also, the device gives warning, through an alarm, that the battery voltage is considerably more than a discharge threshold which, when reached, disconnects the battery from a load circuit. The end of battery life determined depending on charge and discharge cycles and battery ageing is also signaled. The voltage across a resistor connected in series with the battery is amplified by an amplifier having two input terminals connected with the resistor terminals, respectively, via first resistors and first contacts which are closed in response to a detected charging rate, and through second resistors and second contacts which are closed in response to a detected discharging rate.
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Abiven Jacques
Audrain Eric
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