Bidirectional current control circuit suitable for controlling t

Details Bidirectional current control circuit suitable for controlling t Bidirectional current control circuit suitable for controlling t

1997-07-31

1999-03-16

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320134, 320163, H02J 700

Patent

active

058834958

ABSTRACT:
A bidirectional current control circuit suitable for use in controlling the charging and discharging of rechargeable battery cells includes two serially connected metal oxide semiconductor field effect transistors (MOSFETs) with respective body diodes, a resistor which is connected in series with the MOSFETs and develops a voltage based upon the current through such MOSFETs, and a control circuit. The control circuit monitors the voltage across the resistor and selectively switches the MOSFETs on or off individually. As long as the current through the MOSFETs is less than a maximum positive current and more than a minimum negative current, both MOSFETs are maintained in their respective on states. When the negative current becomes less than a minimum negative current, the first MOSFET is turned off while the second MOSFET is turned on, and when the positive current becomes greater than a maximum positive current, the second MOSFET is turned off while the first MOSFET is turned on. In both situations, when the current conducted by the MOSFET which is turned on and the body diode of the MOSFET which is turned off reverses direction and rises above a minimum current while remaining below the corresponding maximum current, a return to a safe operating condition is thereby indicated and both MOSFETs are turned on. In an alternative embodiment, the control circuit monitors the voltage across the MOSFETs themselves to determine whether and when to switch the individual MOSFETs on or off.

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U.S. Patent Application No. 08/801,162, Filed: Feb. 18, 1997, entitled "Methods and Apparatus for Protecting Battery Cells From Overcharge", pp. 1-33.
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