A current is provided from a power source to a load through a pass circuit that is series coupled to a sense resistor. A current trip-point detection circuit is arranged to detect a change in the current that is provided to a load. The current trip-point detection circuit includes at least two resistors...http://www.google.com/patents/US7102415?utm_source=gb-gplus-sharePatent US7102415 - Trip-point detection circuit
