Gate Drive and Signal Path Components
Technical Lecture Session
Gate Drive Circuits II
SiC, gate drive, switching loss
A charge pump gate drive (CPG) is presented in this paper that can help improve the switching speed and reduce turn-on loss. By pre-charging the charge-storage capacitor in the gate drive with a charge pump circuit, the gate drive output voltage is pumped up to provide higher gate current during the turn-on transient. Moreover, due to the charge transfer from the charge-storage capacitor to the MOSFET gate capacitance, the pumped output voltage can naturally drop back to a normal value, avoiding gate overcharging. The structure of the gate drive is simple, and no additional control is needed. The proposed CPG is verified with double pulse tests. The turn-on switching time is reduced by 67.4% at full load condition with the proposed CPG.