Apple Inc.
Battery Path Impedance Compensation

Abstract:

A power system for a battery powered device can include a first stage power converter, a charge injector, and a bypass switch. The first stage power converter can be configured to have an input coupled to a battery and operable to convert a battery voltage to a level higher than a main voltage bus of the battery powered device. The charge injector can include an input coupled to the output of the power converter and an output configured to be coupled to the main voltage bus. The bypass can include one or more bypass switches operable to selectively couple an output of the power converter to the main voltage bus, bypassing the charge injector. The charge injector may be selectively operable as a current source configured to draw power from an output of the power converter and the battery to reduce voltage dips of the main voltage bus.