Computer battery pack charge current sensor with gain control

摘要

A current switch is provided which selects and monitors charge and discharge states of a battery pack of a computer system. The current switch provides a current sense signal which is an indication of the current in the battery pack in order that a charge control circuit can monitor the charge state of the battery pack. The gain of the current sense signal is adjusted, depending on whether the battery pack is in a fast charging, trickle charging, or discharging state when the computer system is in a standby mode. Thus, the current switch provides a sufficient current sense signal for accurate current measurements while dissipating little power for the various battery pack charge states.