Patent ID: 8327165
Filing Date: 2012-12-04
Classification: G06F

Abstract:
1. A power supply input circuit comprising: an input node configured to removeably couple to a plurality of electrical power sources including a wireless electrical power source; a solid state switch coupled between the input node and a capacitive load that is coupled to a power rail, wherein the capacitive load is sized to permit the wireless electrical power source to power a load coupled to the power rail; an RC soft start circuit coupled to the solid state switch, the RC soft start circuit having a capacitor that causes the solid state switch to increasingly pass electrical power from one of the plurality of the electrical power sources to the capacitive load as the capacitor charges from the one of the plurality of the electrical power sources; and an active reset circuit coupled to the RC soft start circuit, the active reset circuit configured to detect when the one of the plurality of the electrical power sources is decoupled from the input node and, in response, discharges the capacitor to actively reset the soft start circuit.