Patent ID: 8537517

Claim:
A method of protecting an electrical device from a power surge, the method comprising the steps of: connecting an input terminal of a fast-acting power protector to an electrical source, wherein the fast-acting power protector is a monolithic semiconductor chip integrating an output voltage clamp and a current limiting block, and wherein at least one pair of common-drain series MOSFET's, which blocks a forward current surge, is dielectrically isolated from a MOSFET for reverse polarity protection inside the current limiting block; connecting an output terminal of the fast-acting power protector to the electrical device for power surge protection; determining whether an incoming electrical current multiplied by a sense resistor value (R sense ) is approximately equal to a surge protection trigger voltage (V os ) for a current trip; if the incoming electrical current multiplied by the sense resistor value (R sense ) is approximately equal to the surge protection trigger voltage (V os ) for the current trip: using at least one pair of common-drain series MOSFET's and at least one reverse-protection diode in the current limiting block of the monolithic semiconductor chip to reduce or shut down the incoming electrical current as a current surge protection; and if a voltage coming out of the current limiting block is surging higher than a clamp output voltage of the output voltage clamp at the output terminal of the fast-acting power protector: holding down the voltage coming out of the current limiting block to the clamp output voltage at the output terminal to the clamp output voltage of the output voltage clamp as a voltage surge protection of the electrical device connected to the output terminal of the fast-acting power protector.