An auxiliary gate driver for crosstalk suppression in bridge-leg of eGaN power devices

Abstract

An auxiliary gate driver for crosstalk suppression in the bridge-leg of eGaN power devices is proposed in this paper. Its essence is to use the negative voltage during the capacitor discharge process to realize positive crosstalk suppression and avoid worsening negative crosstalk voltage after capacitor discharge ends, which has the advantages of easy integration and requires no additional control. Experimental results verify that the proposed gate driver can decrease the positive crosstalk voltage by 2.48 V and improve the turn-off time by 35.71%. The proposed circuit can provide a basis for further improvement of eGaN gate drivers.