Information handling system including a power management apparatus capable of independently switching between a primary and secondary battery

摘要

An information handling system includes a power management apparatus which is capable of selectively coupling to primary and secondary batteries that provide portable and backup power to the information handling system. The power management apparatus senses when the voltage at the power input of the information handling system drops below a predetermined threshold voltage. Respective switching diodes between the primary battery and the power input and the secondary battery and the power input are used as a means of fast hardware connection of the selected battery to the power input. Respective bypass switches are connected in parallel with the switching diodes. Control software instructs the bypass switch across the diode associated with the selected battery to close to prevent diode power loss. In this manner, a selected primary or secondary battery is independently switched to the power input, provided the selected battery exhibits a voltage greater than the predetermined threshold voltage.