Automatic electronic bypass power switch

Details Automatic electronic bypass power switch Automatic electronic bypass power switch

1998-01-26

1999-04-27

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307125, 320134, 324433, 429 61, H01M 234

Patent

active

058982396

ABSTRACT:
In a multi-cell battery, an open-circuit failure of any one cell renders the entire battery unusable. An automatic electronic bypass switch is connected across each battery cell to provide a low-resistance conductive path around such battery cell should it fail. Contrary to conventional usage in which a fuse is employed to "clear" or "open" a short-circuit condition, the electronic switch of the present invention employs a fuse to activate a highly conductive path, which ideally would approach a short circuit, around an open-circuit condition. The electronic switch includes a field-effect transistor connected across the battery cell and a fuse to hold the field-effect transistor in the "off" condition. Diodes connected between the field-effect transistor and the fuse provide a current path for battery charging and/or discharging current to open the fuse if the battery cell fails open circuit, thereby allowing the field-effect transistor to turn to the "on" condition becoming a conductive path in parallel with the failed battery cell. An electronic switch is preferably connected across each cell of a multi-cell battery.

REFERENCES:
patent: 3846679 (1974-11-01), Jost et al.
patent: 4935315 (1990-06-01), Herrin
patent: 5180641 (1993-01-01), Burns et al.
patent: 5258244 (1993-11-01), Hall et al.
patent: 5510598 (1996-04-01), Kawam et al.
patent: 5650240 (1997-07-01), Rogers
patent: 5689209 (1997-11-01), Williams et al.

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