Patent ID: 9048662
Filing Date: 2015-06-02
Classification: H02H

Abstract:
1. A DC surge protection circuit comprising: a power input node for receiving an input signal, the input signal being either a surge signal or a non-surge signal; a power output node for outputting the non-surge signal; a first inductor electrically connected to the input node and the output node for permitting the non-surge signal to flow substantially unimpeded from the power input node to the power output node; at least one diode electrically connected between the power output node and a ground node for diverting at least a first portion of the surge signal to the ground node; a first metal oxide varistor electrically connected between the power input node and the ground node and in parallel with the at least one diode, the first metal oxide varistor being configured to divert at least a second portion of the surge signal after the at least one diode diverts the at least the first portion of the surge signal; a surge protection switch electrically connected between the at least one diode and the ground node, the surge protection switch having a current state of either an open state or a closed state; and an auxiliary switch electrically connected to the ground node, the auxiliary switch having a current state of either an open state or a closed state, wherein the current state of the auxiliary switch is based on the current state of the surge protection switch.