Method for balancing power sources and structure therefor

Details Method for balancing power sources and structure therefor Method for balancing power sources and structure therefor

1995-10-04

1997-07-08

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 15, 320 17, H01M 1044, H02J 700

Patent

active

056465033

ABSTRACT:
A power source balancing circuit (10) balances two power sources such as two battery cells (12 and 42). When the power source balancing circuit (10) is enabled, it compares a current flowing through the first battery cell (12) and a first resistor (22) with a current flowing through the second battery cell (42) and a second resistor (52). Because the resistance of the first resistor (22) is equal to that of the second resistor (52), a difference between the two currents indicates a difference between the voltages of the two battery cells (12 and 42). If a current difference larger than a predetermined limit is detected, the battery cell (12 or 42) with a higher voltage is discharged through a corresponding discharge resistor (14 or 44) by switching on a corresponding switch (16 or 46). The corresponding switch (16 or 46) is controlled by a corresponding flip-flop (32 or 62).

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