Battery manager chip with crystal-controlled time base

Details Battery manager chip with crystal-controlled time base Battery manager chip with crystal-controlled time base

1990-12-21

1992-09-29

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 37, 320 39, H02J 700

Patent

active

051516446

ABSTRACT:
A battery management chip which controls charging and discharging currents of a rechargeable battery. A further novel teaching set forth in the present application is an integrated circuit which includes a crystal-controlled oscillator for precise time measurement. Crystal-controlled oscillators are normally fairly power-hungry circuits, and such circuits would not normally be used in the low-power part unless needed. However, according to this innovative teaching, the precise time integration provided by the crystal oscillator is significantly advantageous, since it permits accurate time integration to derive the present state of the battery after multiple charge and discharge cycles. In addition, in the presently preferred embodiment, a low-power crystal-controlled oscillator is used.

REFERENCES:
patent: 3609503 (1971-09-01), Burkett
patent: 3766403 (1973-10-01), Tsutsumi
patent: 4571531 (1986-02-01), Lin
patent: 4742289 (1988-05-01), Wahlstrom
patent: 5029198 (1991-07-01), Walpole et al.

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