Patent ID: 9584046
Date: 2017-02-28
CPC Classifications: H02M,H03K

Claim:
1. A gate drive circuit for a power transistor, the gate drive circuit comprising: a first capacitor, a first terminal of the first capacitor being electrically coupled to a gate terminal of the power transistor, a first switch being arranged between a second terminal of the first capacitor and a first predetermined voltage, a measurement circuit for measuring a differential voltage across the first capacitor, a reference source for generating a reference voltage, the gate drive circuit being configured to pre-charge the first capacitor to obtain a second predetermined voltage across the first capacitor, the gate drive circuit being further configured to arrange the first switch in an on state for turning on the power transistor to electrically couple the first predetermined voltage to the second terminal of the first capacitor being pre-charged at the second predetermined voltage, the measurement circuit being configured to arrange the first switch in an off state when the differential voltage across the first capacitor has changed with respect to the second predetermined voltage by the reference voltage.