A power MOSFET includes a main MOSFET connected in series with a load resistor between a high voltage power supply voltage and ground, and a series circuit connected in parallel to the main MOSFET and composed of a sensing MOSFET and a converting MOSFET for converting a shunted current flowing...http://www.google.com/patents/US5767545?utm_source=gb-gplus-sharePatent US5767545 - Power mosfet having current detection means
