Rechargeable battery overdischarge prevention circuit

Details Rechargeable battery overdischarge prevention circuit Rechargeable battery overdischarge prevention circuit

1994-01-18

1995-03-14

Peckman, Kristine L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

361 92, H02J 700

Patent

active

053979745

ABSTRACT:
A first switch element is connected in series with a rechargeable battery, a second switch element is connected in parallel to the series circuit of the rechargeable battery and the first switch element, and a control circuit controls ON and OFF states of the first switch element and the second switch element. The control circuit is so constructed as to turn OFF the first switch element to stop discharging and at the same time turn ON the second switch element when the battery voltage becomes lower than a predetermined value. The second switch element maintains the first switch element in OFF state even when the battery voltage of the rechargeable battery rises by self resetting of the rechargeable battery. When a charging voltage is applied to the rechargeable battery, the control circuit then turns ON the first switch element and turns OFF the second switch element.

REFERENCES:
patent: 3621276 (1971-11-01), Mitchell
patent: 3648145 (1972-03-01), Meyer et al.
patent: 4132942 (1979-01-01), Yamamoto
patent: 4342953 (1982-08-01), Collins
patent: 4439805 (1984-03-01), Tarleton
patent: 4698578 (1987-10-01), Mullersman et al.
patent: 5073837 (1991-12-01), Baek
patent: 5177426 (1993-01-01), Nakanishi et al.
patent: 5179337 (1993-01-01), Staarman et al.
Swift et al., "Protect Your Rechargeable Battery", Jun. 7, 1978, pp. 112-114 of Electronic Design.

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