公开(公告)号：US09837887B1

公开(公告)日：2017-12-05

申请号：US15224713

申请日：2016-08-01

Applicant: Ford Global Technologies, LLC

Inventor： Yan Zhou ,  Lihua Chen ,  Shuitao Yang ,  Fan Xu

IPC: H02P1/04 ,  H02M1/088 ,  H02P27/08 ,  H03K17/567 ,  B60L11/18 ,  B60K6/42 ,  H02M1/00

CPC classification number: B60K6/42 ,  B60L11/1803 ,  B60L2210/14 ,  H02M2001/0054 ,  H02P27/08 ,  H03K17/165 ,  H03K17/168

Abstract: A vehicle powertrain includes an IGBT, having a Kelvin emitter and a mirror current sense, configured to energize an inductance, a first switch configured to draw a current from a gate of the IGBT at a rate based on a resistance engaged by the first switch while a current of the inductance exceeds a threshold, and a second switch configured to increase the rate in response to the current being less than the threshold. In one embodiment, the current is based on a filtered voltage across a resistor connected between the mirror current sense and chassis ground while the Kelvin emitter is connected to chassis ground. In another embodiment, the current is based on a filtered voltage across a resistor connected between the mirror current sense and the Kelvin emitter.