Patent ID: 8514009
Filing Date: 2013-08-20
Classification: H02M

Abstract:
1. A current sensing circuit comprising: a power MOSFET for supplying power to a load; a series combination of a sense resistor and a sense MOSFET, which connected in parallel to the power MOSFET; a first gate drive circuit for driving the gate of the sense MOSFET, delaying the rising edge of a drive signal by a first delay time; and a second gate drive circuit for driving the gate of the power MOSFET, delaying the falling edge of the drive signal by a second delay time, wherein the rising edge of the gate-source voltage of the sense MOSFET is so defined by means of the first delay time as to exceed a threshold voltage after the clock time when the gate-source voltage of the power MOSFET gets to a high level steady value.