US 10,708,096 B2Granted

Method for demodulating frequency modulated signal of PMA standard wireless charging device

AssigneeWuxi China Resources Semico Co., Ltd.

InventorsCongying Wang, Wenli Shu, Rui Zhang, Qiyi Zhao

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Abstract

The present disclosure relates to a method for demodulating a frequency modulated signal of a PMA standard wireless charging device, including: (1) reading coil signals, sampling the coil signals, and counting cycles; (2) extracting a frequency change according to a change in a cycle count; (3) determining data according to the frequency change and a frequency duration and outputting the data; and (4) splicing the outputted data. With the method, a demodulation part does not require a complex analog circuit, and the highest frequency desired at a digital circuit part is only 4 MHz. Moreover, at this frequency, there is only a simple addition operation, and the main operating frequency is below 236 KHz.

Claims12

Dependent claims

A method for demodulating a frequency modulated signal of a PMA standard wireless charging device, wherein the method comprises following steps:

(1) reading coil signals, sampling the coil signals, and counting cycles;
(2) extracting a frequency change according to a change in a cycle count;
(3) determining data according to the frequency change and a frequency duration and outputting the data;
and
(4) splicing the outputted data, and
wherein the step (2) comprises the following steps:
(2-1) calculating a sum of numbers of sampling points in a latest 24 cycles according to a count value of the latest cycle;
(2-2) filtering the sum of the numbers of the sampling points in the 24 cycles, and eliminating frequency jitter caused by sampling;
(2-3) counting Fop points;
(2-4) calculating sum_delta by the following formula:
sum_delta=out_IIR−sum_Fop,
where sum_delta is a differential result between the filtered outputted value and a currently determined Fop value sum_Fop, out_IIR is the filtered outputted value, and sum_Fop is a count value of the Fop points;
and
(2-5) eliminating the frequency jitter, modifying the waveform and outputting the modified waveform.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/337,513Filed 29 Jul 2017
Priority: CN 2016 1 09541403 Nov 2016
Published: US 2019/0253288 A115 Aug 2019
Granted: 7 Jul 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 27/148
With demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements: using…
H04L 27/1563
With demodulation using temporal properties of the received signal, e.g. detecting pulse width: using transition or level detection
H04B 5/79
Specially adapted for specific purposes: for data transfer in combination with power transfer
H04L 27/16
Frequency-modulated carrier systems, i.e. using frequency-shift keying: frequency regulation arrangements