Synchronous rectifier circuit of wireless charging receiving terminal

Abstract

The invention relates to a synchronous rectifier circuit of a wireless charging receiving terminal, which is used to realize the rectification function of a wireless charging receiver. The synchronousrectifier circuit is connected between a resonant circuit of the wireless charging receiver and a load, and includes an MOS transistor rectifier circuit and a synchronous rectifier control circuit. The synchronous rectifier control circuit controls the working sequence of the MOS transistors in the MOS transistor rectifier circuit by controlling the driving voltages input to the MOS transistors in the MOS transistor rectifier circuit, so that the synchronous rectifier circuit has a rectification effect consistent with a preset effect. By adopting the synchronous rectifier circuit of the wireless charging receiving terminal of the invention, the rectification efficiency is higher than that of the diode rectifier circuit in the prior art, and the heating problem caused by diode rectification loss can be significantly improved. The synchronous rectifier circuit is simple and convenient, needs no additional software control, and can be used as an independent module to replace the diode rectifier module.

Description

technical field [0001] The present invention relates to the field of wireless charging, in particular to the field of rectification control of a wireless charging receiver, and specifically refers to a synchronous rectification circuit of a wireless charging receiving end. Background technique [0002] Wireless charging is a technology that uses electromagnetic induction between planar coils to transmit energy between chargers and devices. In a common wireless charging system based on full-bridge diode rectification, the charger is called the sending end, the voltage regulator provides DC power for the sending end, and the inverter module converts the DC power into AC power. The oscillating electrical signal is generated on the series loop, and the alternating magnetic field is sent through the sending coil; the receiving coil Ls at the receiving end absorbs the energy of the alternating magnetic field, and an oscillating electrical signal is generated on the series loop wit...

AI Technical Summary

Problems solved by technology

[0003] The conduction voltage drop of the rectifier diode is 0.7V, so the loss of the rectifier module with the full-bridge diode structure will multiply due to the increase of the current passing through the diode, which will cause greater loss in a high-power wireless charging system and will Cause severe fever and pose a safety hazard

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