POWER MANAGEMENT APPARATUS FOR ENERGY HARVESTING

A power management apparatus comprises: a plurality of energy harvesting input channels -; a first energy storage element connection for connecting to an energy storage element ; an inductor connection ; and a switching circuit . A controller operates the switching circuit to transfer energy between the energy harvesting input channels - and the first energy storage element connection by a sequence of energy transfer cycles. Each energy harvesting input channel - is allocated a plurality of the energy transfer cycles. The controller determines operating parameters for operating the switching circuit which transfer a maximum power from the electrical energy harvesting source connected to the energy harvesting input channel and a maximum power inductor utilisation factor. The controller determines a set of adjusted operating parameters for sharing use of the inductor between the plurality of energy harvesting input channels -. An energy harvesting input channel - is selected for adjustment based on an effect of a change in the inductor utilisation factor and a corresponding change in power of the energy harvesting input channel.