Signal processing method for wireless charging system, receiving terminal and storage medium

Abstract

The invention discloses a signal processing method for a wireless charging system, a receiving terminal and a storage medium. The method comprises the steps of transmitting a signal on a receiving coil to an input end of a comparator of a demodulation chip through the receiving terminal, sampling an output value of the comparator and obtaining the number of sampling points in one period; demodulating the signal according to the number of the sampling points in one period; synthesizing a complete data frame according to the demodulation result of the signal; and verifying and outputting the complete data frame. According to the signal processing method, electric energy is transmitted by using a frequency band, and the signal processing method is more suitable for an FSK signal of a QI standard, is low in cost, high in demodulation speed, easy to debug and relatively high in accuracy, and is free of a requirement for whether a communication carrier frequency is fixed or not.

Description

technical field [0001] The technical field of wireless charging of the present invention relates in particular to a signal processing method, a receiving terminal and a storage medium of a wireless charging system. Background technique [0002] In the wireless charging equipment of the QI (Qi is the world's first standardization organization to promote wireless charging technology - the "wireless charging" standard launched by the Wireless Charging Alliance, which has two major characteristics of convenience and versatility), the energy transmitter transmits to the energy The communication signal at the receiving end is transmitted through 2FSK (binary frequency shift keying), and the difference from the traditional 2FSK signal is: according to the communication protocol of the QI standard, at different stages of the same system, the communication carrier frequency Fop and the modulation frequency Fmod are parallel Not fixed, and the frequency difference between Fop and Fmod...

AI Technical Summary

Problems solved by technology

At the same time, since the signal received by the energy receiving end in the wireless charging system is an inductively coupled signal, the received signal is not a single-frequency sinusoidal signal, but may be doped with a large amount of high-frequency noise

[0004] The traditional 2FSK demodulation methods mainly include three methods: coherent demodulation, filter non-coherent demodulation and quadrature multiplication non-coherent demodulation; due to the limitation of the QI standard communication protocol, the difference between the carrier frequency Fop and ...

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