POWER MANAGEMENT APPARATUS FOR ENERGY HARVESTING

A power management apparatus comprises a first energy harvesting input channel ; a first energy storage element connection ; an inductor connection ; and a switching circuit . A controller is configured to operate the switching circuit to transfer energy between the first energy harvesting input channel and the first energy storage element connection by a sequence of energy transfer cycles. Each of the energy transfer cycles comprises an energise phase in which energy is transferred from the first energy harvesting input channel to the inductor connection for an energise time (tE) and a de-energise phase. The first energy harvesting input channel is capable of receiving an AC electrical signal and a DC electrical signal. The controller is configured to determine a type of an electrical signal received at the first energy harvesting input channel , where the type is one of an AC electrical signal and a DC electrical signal, and determine an energise time (tE) and a harvesting cycle period (tP) for the switching circuit based on the determined type.