Battery charger having fast charge rate and high reliability

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

Patent

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320 22, 323DIG1, H02J 704

Patent

active

039597075

ABSTRACT:
A battery charger for charging a temperature-sensitive battery in a rapid manner without damage to the battery, such batery being equipped with means for providing a reference voltage whose level changes with battery temperature in a similar fashion to the theoretical battery voltage change with temperature. The battery charger comprises a current-carrying conductor adapted to be connected to one terminal of the battery to be charged, with the conductor including a controlled current limiting switch serving to diminish the average amount of current flowing into the battery at such time as the battery has become patially charged. Means are provided for recurringly turning said switch on and off so as to produce a sawtooth waveform, and means sensitive to the comparison of the reference voltage with the actual battery voltage are arranged to cause a diminishment of the average value of the sawtooth waveform, thus to prevent damage to the batery from heating or from overcharging. The means for providing the reference voltage may be silicon diodes disposed in the battery case, and the diminishment of current may be brought about by causing a decrease in the amplitude of the sawtooth waveform, by causing a spreading of the peaks of the sawtooth waveform, or by the use of both of these techniques.

REFERENCES:
patent: 2726331 (1955-12-01), Robinson
patent: 3383584 (1968-05-01), Atherton
patent: 3602794 (1971-08-01), Westhaver
patent: 3736489 (1973-05-01), Mullersman

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