Design of Active Closed-loop Driver Chip for SiC

Abstract

The SiC active control scheme mainly uses phased control, which makes the circuit implementation complex and unfavorable to design due to the need for detection circuits. And the longer feedback delay will affect the accuracy of the control. In this paper, a closed-loop driving SiC scheme is proposed. By integrating the driver circuit, protection circuit, and detection circuit on one chip, the SiC drive current is controlled by a staged control scheme, which can reduce the switching loss with low current and voltage overcharge. The specific circuit design uses Hua Hong BCD350GE technology, which mainly includes a power supply module, a feedback signal processing module, an Undervoltage protection module, a desaturation protection module, a logic control module, and a driver output module, and is verified by beat virtuoso simulation. Test results show that compared with Infineon driver chip 1EDS20I12SV, the switching loss of SiC is reduced by 25.75% when driving SiC at the same turn-off voltage, and the loss reduction is more obvious.