A megahertz synchronous rectification system and wireless charger
By introducing adjustable phase delay of the resonant gate drive module and fixed phase delay compensation of the signal processing module at the megahertz-level wireless charging receiver, the problems of inaccurate synchronization signal and conduction loss of dead-zone diode are solved, achieving efficient synchronous rectification and improving rectification efficiency and system reliability.
CN122268170APending Publication Date: 2026-06-23SHANGHAI TECH UNIV
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI TECH UNIV
- Filing Date
- 2026-04-03
- Publication Date
- 2026-06-23
AI Technical Summary
Technical Problem
In megahertz-level wireless charging receivers, inaccurate synchronization signals and high conduction and drive losses of dead-zone diodes lead to low rectification efficiency.
Method used
By introducing the adjustable phase delay of the resonant gate drive module and the fixed phase delay compensation of the signal processing module, the conduction timing of the synchronous rectifier switch is ensured to be in phase with the resonant cavity current, and a sinusoidal gate drive signal is generated in a self-synchronizing manner.
Benefits of technology
It significantly improves rectification efficiency, reduces drive losses, and enhances system integration, reliability, and anti-interference capabilities, making it suitable for high-frequency wireless charging applications.
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Figure CN122268170A_ABST
Abstract
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.
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