Charging circuit of secondary battery

Details Charging circuit of secondary battery Charging circuit of secondary battery

1992-09-17

1994-09-06

Peckman, Kristine L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, H02J 710

Patent

active

053451627

ABSTRACT:
A reference voltage generating circuit generates a reference voltage Vz, which is a predetermined level different from the potential of one of the terminals of a secondary battery. A minute voltage change extracting circuit comprises a operational amplifier to which the reference voltage Vz is input, a capacitor C, and a resistor R. The minute voltage change extracting circuit extracts minute voltage changes, which appear in the last stage of a process of charging the secondary battery and have components of a frequency higher than a change in a terminal voltage corresponding to the amount of charge, as output signals which vary around the reference voltage Vz. The output signals are shaped into pulse signals by a shaping circuit. The pulse signals are counted by a counter circuit. When the count reaches a predetermined value, charging of the secondary battery is controlled.

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