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.

Abstract: A circuit structure for efficiently demodulating an FSK signal in a wireless charging device, comprising a data sampling module, a period point counting module, a data distribution module, and a period point processing module. An input terminal of the period point counting module is connected to an output terminal of the data sampling module; an input terminal of the data distribution module is connected to an output terminal of the period point counting module; and an input terminal of the period point processing module is connected to an output terminal of the data distribution module.

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.

Abstract: A circuit structure for efficiently demodulating an FSK signal in a wireless charging device, comprising a data sampling module, a period point counting module, a data distribution module, and a period point processing module. An input terminal of the period point counting module is connected to an output terminal of the data sampling module; an input terminal of the data distribution module is connected to an output terminal of the period point counting module; and an input terminal of the period point processing module is connected to an output terminal of the data distribution module.