A Digital Adaptive Discontinuous Current Source Driver for High-Frequency Interleaved Boost PFC Converters

A digital adaptive current source driver (CSD) is proposed for the interleaved Boost PFC converter. The adaptive drive current is achieved for the CSDs to optimize the switching loss and gate drive loss according to different turn-on and turn-off drain currents in a wide load range. Compared to the adaptive CSDs with the linear regulator, the digital adaptive CSD is able to eliminate the additional loss and cost introduced by the linear regulator. The most important benefit of the digital CSD is that the turn-on and turn-off drive current can be adjusted independently according to the different turn-on and turn-off drain currents. At the same time, the proposed digital CSD is compatible with other advanced digital control technique. The proposed digital CSD is applied to the interleaved Boost PFC converter under critical conduction mode (CRM) to reduce the high turn-off loss and gate drive loss. A 220-V AC input, 380-V/400-W output, two-phase interleaved Boost PFC converter with the switching frequency of 90-500 kHz under CRM was built to verify the functionality and advantages of the digital CSD.