Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1995-08-08
1996-12-03
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 5, 320 40, 320 48, 320 14, H02J 700
Patent
active
055811701
ABSTRACT:
A battery protector for providing overvoltage and undervoltage protection to one or more series-connected cells. The battery protector includes a voltage detection and comparison circuit, providing an overvoltage signal indicative of whether the voltage across any of the cells is greater than an overvoltage threshold level and an undervoltage signal indicative of whether the voltage across any of the cells is less than an undervoltage threshold level, and a switch connected in series with the current path between the cells and a charger and/or load. In one embodiment, the switch is a four-terminal FET and a bias control circuit is provided for selectively connecting the body region of the FET to ensure that current does not flow through the parasitic FET diodes. A second control circuit responsive to the overvoltage and undervoltage signals controls conduction of the switch, causing the switch to close if any of the following conditions occur: (1) the overvoltage and undervoltage signals do not indicate an overvoltage or undervoltage condition, respectively; (2) the overvoltage signal indicates an overvoltage condition, but the cells are attempting to discharge; or (3) the undervoltage signal indicates an undervoltage condition, but the charger is attempting to charge the cells.
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Mammano Robert A.
McClure Winthrop H.
Price Burt L.
Wofford Larry
Shin K.
Unitrode Corporation
Wong Peter S.
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