Patent ID: 9548732
Date: 2017-01-17
CPC Classifications: H02M,H03K

Claim:
1. A self-powered gate drive circuit comprising: a first capacitor electrically coupled to a power semiconductor collector node of the circuit; a first switch arranged between the first capacitor and a second capacitor, the first switch electrically coupling the first and second capacitors when switched on; the second capacitor; a first diode, the first diode anode electrically coupled to the first capacitor and the first diode cathode electrically coupled to the first switch; a second diode, the second diode cathode electrically coupled to the first capacitor and the second diode anode electrically coupled with a ground node of the circuit; and a second switch, wherein the second switch electrically couples the second capacitor with a power semiconductor gate node when switched on; a third switch electrically coupled to the ground node, the third switch electrically coupling a third capacitor with the ground node if switched on; and the third capacitor, a first capacitor lead of the third capacitor electrically coupled to the first and second switches and a second capacitor lead of the third capacitor arranged to connect with a power transistor gate node of the circuit.