Patent ID: 8971002
Filing Date: 2015-03-03
Classification: H02H

Abstract:
1. A solid state fault current limiting device for use with an AC power line, comprising: a solid state switching device, disposed in series in said AC power line, said solid state switching device having an input, an output and a gate, where a voltage applied to said gate determines whether current flows between said input and said output; a gate driving circuit in communication with said gate, to apply a gate voltage to said gate, said voltage referenced to either a voltage at said input or at said output; a current monitor in communication with said AC power line and said gate driving circuit, wherein said gate voltage is determined based on an output from said current monitor; an isolation transformer, having a primary winding and a secondary winding; and a non-isolated AC-to-DC power supply, powered by said secondary winding and referenced to said voltage at said input or at said output, to supply DC power to said gate driving circuit.