1results about How to "Reduce voltage spikes" patented technology

The application discloses a megahertz synchronous rectification system and a wireless charger, and the system comprises a wireless charging receiving side resonant converter and a megahertz synchronous rectification control circuit. The wireless charging receiving side resonant converter comprises a resonant cavity and a half-bridge synchronous rectification module, the input end of the half-bridge synchronous rectification module is connected with the resonant cavity, and the output end is connected with a load. The megahertz synchronous rectification control circuit comprises a signal processing module and a resonant gate drive module, the signal processing module acquires the coil voltage of the resonant cavity and carries out voltage division, comparison and amplification, and outputs a square wave gate drive signal; the resonant gate drive module shapes the square wave gate drive signal into a sine wave gate drive signal. Wherein, the resonant gate drive module introduces an adjustable phase delay, which is used for compensating the fixed phase delay of the signal processing module and the synchronous rectification switch tube, so that the conduction timing of the switch tube is in phase with the resonant cavity current. The application significantly improves the rectification efficiency of the wireless charging receiving end and reduces the system loss.