Power supply for electronic device, and electronic device system

摘要

To make it possible to supply to a battery a charging current having a sufficient capacity which enables a short-time charge while supplying a drive current for usual operation to a battery operable electronic device, without making construction large-sized and complicated. The present invention is intended to be able to delicately vary a charging current of a battery according to the variation of power consumption of load on an electronic device, by providing constant power feedback control means for performing feedback control of the outputted power so as to cause a constant power or a nearly constant power, based on a current feedback value and a voltage feedback value.