Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1993-03-19
1996-05-07
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 35, 320 39, H02J 704, H01M 1044
Patent
active
055149464
ABSTRACT:
A battery pack for a computer system including static memory to maintain battery operating parameters and charge information, a real time clock (RTC) for measuring periods of non-use of the battery and a communication circuit to exchange the battery information with a microcontroller located in the computer system. The static memory, RTC and communication circuit is preferably in the form of a single RAM/RTC chip. The battery pack also includes circuitry to maintain power to the RAM/RTC from the battery if AC power is not available. The microcontroller detects the presence of the battery and retrieves the present time from the RTC, a timestamp indicating time or removal of the battery and other operating parameters and charge information from the battery pack, and controls the charging functions of the battery accordingly. The microcontroller also updates the charge information of the battery pack while performing other housekeeping functions of a DC--DC converter. The microcontroller further controls a switch located in the charge path of the battery to control fast charging. Trickle charge is simulated by pulsing the switch at a predetermined duty cycle and period. The microcontroller may be placed in standby to conserve energy, while also monitoring the standby switch to pull the computer system out of standby mode if the standby switch is pressed. This allows the keyboard controller to be shut off during standby mode to conserve energy.
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Lin David S.
Schneider Michael E.
Compaq Computer Corp.
Tso Edward
Wong Peter S.
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