Patent ID: 6043965
Filing Date: 2000-03-28
Classification: H02H

Abstract:
A circuit including an electrical load normally powered by voltage of a first polarity across a pair of circuit terminals, said circuit effective for preventing current flow through the electrical load caused by voltage of a second polarity opposite the first polarity across the pair of circuit terminals, the improvement comprising:said electrical load having high and low potential terminals, said high potential terminal coupled to the one of the pair of circuit terminals at a higher potential than the other of the pair of circuit terminals when voltage of the first polarity is across the pair of circuit terminals; and,a first N-channel MOSFET having a source coupled to the low potential terminal of the electrical load, a gate coupled to the high potential terminal of the electrical load, and a drain coupled to the one of the pair of circuit terminals at a lower potential than the other of the pair of circuit terminals when voltage of the first polarity is across the pair of circuit terminals.