Patent ID: 8749222
Filing Date: 2014-06-10
Classification: G01R,H01L,H02M,H03K

Abstract:
1. A method of sensing the magnitude of a current through semiconductor power device comprising: connecting a drain terminal of a main MOSFET to the power device; connecting a source terminal of the main MOSFET to a source terminal of a sense MOSFET, a gate width of the main MOSFET being larger than a gate width of the sense MOSFET; connecting a gate terminal of the main MOSFET to a gate terminal of the sense MOSFET; causing a voltage at the drain terminal of the main MOSFET to be equal to a voltage at a drain terminal of the sense MOSFET; causing a current to flow through the power device and the main MOSFET; and measuring the magnitude of a current in the sense MOSFET.