Low-consumption demodulation method for FSK signal in wireless charging equipment
A technology of a wireless charging device and a demodulation method, applied in the electronic field, can solve the problems of increasing circuit overhead, increasing demodulation system overhead, etc., and achieve the effects of easy debugging, fast demodulation, and low cost
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[0058] In order to be able to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.
[0059] The low-consumption demodulation method of the FSK signal in the wireless charging device of the present invention abandons the traditional 2FSK coherent demodulation and non-coherent demodulation. According to the characteristics of the 2FSK signal in the QI standard, the analog circuit part only uses a comparator to replace the ADC The sampling circuit and the digital part can demodulate the FSK signal with a clock frequency of up to 2MHz.
[0060] See figure 1 As shown, the low-consumption demodulation method of the FSK signal in the wireless charging device of the present invention firstly receives the signal on the coil and sends it to the input of the comparator of the demodulation chip, and then includes the following steps:
[0061] (1) Sampling the output value of the comparator and obta...
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