Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1997-09-03
1999-02-02
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
H01M 1046
Patent
active
058670076
ABSTRACT:
A battery selection circuit for dual battery packs discharges the batteries in a stable way without regard to voltage differences. Also, if one of the batteries is installed, the battery is effectively selected to prolong battery life. When this circuit is adopted in a notebook computer, battery usage time is substantially increased. The battery selection circuit includes a battery detector for sensing the existence of the first and second battery packs and for producing the detect signals corresponding thereto. These detect signals are provided to a microcontroller to produce first and second battery discharge enable signals. In response to the first and second battery discharge enable signals, first and second electronic switches respectively connect each power supply line from the first and second batteries to a power supply circuit of the device. Reverse current blocking diodes are provided in series with the first and second switches, and a low resistive current path circuit is provided in parallel with the reverse current blocking diodes. The first switch and second switch as well as the low resistive current path circuit may include MOS FET transistors. Advantageously, a control circuit including logic gates is provided for opening the low resistive current path circuit when both the first and second batteries are detected, and for closing the corresponding low resistive current path circuit when one of the first and second batteries is detected.
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Bushnell Esq. Robert E.
Samsung Electronics Co,. Ltd.
Tso Edward H.
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