A highly adaptive synchronous rectification control method for a wireless charging receiver

Abstract

The invention discloses a control method for highly adaptive synchronous rectification for a wireless charging receiving end, and the method comprises the steps: carrying out the rectification of theoutput of an LC resonance network of a wireless charging receiving end through employing a rectifier bridge circuit comprising four MOS transistors; adopting a control circuit comprising a logic controller XOR Logic and four comparators to control the on and off of the four MOS transistors, wherein the four comparators are used for comparing the input voltage of the rectifier bridge circuit with the output voltage or the grounding voltage of the rectifier bridge circuit respectively, output signals of the four comparators are input into the logic controller XOR Logic for logic operation, and the logic controller XOR Logic outputs control signals used for controlling the four MOS transistors to be connected and disconnected. According to the invention, the four MOS transistors with lower conduction loss are turned on or turned off to replace diodes in a traditional diode rectification circuit such that higher rectification efficiency can be obtained.

Description

technical field [0001] The invention relates to the technical field of synchronous rectifiers at a wireless charging receiving end, in particular to a highly adaptive synchronous rectifying control method at a wireless charging receiving end. Background technique [0002] In the wireless charging system, the wireless charging receiver converts the alternating electromagnetic energy generated by the wireless charging transmitter into stable DC power through the near-field coupling of the LC resonant network. The process of converting AC power into DC power in a wireless charging system is defined as rectification, and the circuit function module that completes the rectification is defined as a rectifier. [0003] A traditional rectifier consists of 4 diodes such as figure 1 Connect as shown. Among them, the diode rectification circuit composed of diode D1, diode D2, diode D3 and diode D4 rectifies the AC power generated by the wireless charging transmitter into a DC voltage...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a highly self-adaptive wireless charging receiver for the problem that the traditional diode rectifier circuit has a conduction loss caused by the forward conduction voltage drop of the diode, which will reduce the rectification efficiency of the wireless charging system. Synchronous rectification control method, to turn on or off the MOS tube with lower conduction loss through appropriate control method to replace the diode in the traditional diode rectification circuit to obtain higher rectification efficiency

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