SELF-ADAPTIVE SYNCHRONOUS RECTIFICATION CONTROL SYSTEM AND CONTROL METHOD FOR TIME-DIVISION MULTIPLEXING HARDWARE

摘要

Disclosed in the present invention are a self-adaptive synchronous rectification control system and control method for time-division multiplexing hardware, which are suitable for high voltage and high frequency resonant converters. A secondary synchronous rectifier switch of a resonant converter uses a GaN power tube to utilize reverse voltage drop characteristics thereof, and provided are a self-adaptive synchronous rectification control system and control method, thereby achieving the direct detection of a turn-off "too early" state, a turn-off "too late" state and a "turn-off on time" state of a synchronous rectifier switch; and after undergoing a number of modulation periods, a power tube turns off on time and enters a steady-state control mode. In the present invention, turn-off states are more easily detected, thus achieving more precise control, conserving chip processing resources, and improving the efficiency of resonant converters. At the same time, time-division multiplexing hardware is provided, thereby further improving the utilization rate of hardware resources and reducing hardware costs.