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A kind of ask signal filter method and equipment

A signal filtering and signal technology, which is applied in the field of electronic power technology and wireless charging, can solve the problems of software demodulation relying on hardware, etc., and achieve the effects of reducing costs, increasing charging area, and increasing charging distance

Active Publication Date: 2022-02-01
四川中微芯成科技有限公司
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the software demodulation of the TX end of wireless charging is too dependent on hardware, the present invention provides a filtering method, which can be implemented using software and does not rely on hardware implementation, and it can solve the problem of insufficient modulation depth or even the high frequency of AC waveform distortion. Frequency and peak interference are filtered to reduce noise, and the ASK data packet sent by RX is screened and restored from the messy signal, so as to reduce the dependence of demodulation on hardware, so that the demodulation ability has been significantly improved, and the charging of wireless charging has been improved. distance, and increase the charging area of ​​wireless charging

Method used

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  • A kind of ask signal filter method and equipment
  • A kind of ask signal filter method and equipment
  • A kind of ask signal filter method and equipment

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] According to the QI protocol, RX uses amplitude shift keying modulation to communicate with TX. RX connects the modulation capacitor in series to the LC resonance loop to modify the resonance point, causing the amplitude of the TX coil to change. TX detects the envelope of the coil current or voltage, and operates After amplification and denoising, the ASK signal sent by RX is obtained. RX modulates the data bits onto the power signal using differential biphase encoding. To do this, RX should align each data bit with the internal clock signal Tclk so that the start of the data bit coincides with the edge of the clock signal. The frequency clk of this internal clock signal should be 2±4%kHz.

[0027] like figure 1 As shown, a bit needs to last for 500us, a level inversion of 250us in the modulation signal is to encode Bit1, a...

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Abstract

The invention relates to the field of wireless charging, in particular to a filtering method for demodulating an ASK modulation signal and a wireless charging device. The steps of the filtering method include: receiving the ASK signal, starting from the end of the last bit demodulation, initializing the cumulative time of the level to be 0, initializing the number of level jumps to be 0, and obtaining the level duration in a loop, the level The duration is the level time between two jumps. Every time the level duration is obtained, add it to the level accumulation time, and add 1 to the number of level jumps. If the level When the number of level transitions is an odd number greater than or equal to 1, assign a value to the current bit according to the accumulated level time; if the accumulated level time is greater than the first threshold, or the number of level transitions is greater than 1 and the current level lasts When the time is greater than the second threshold, jump out of the loop, and the process ends. The present invention adds a more excellent filtering method to the mainstream demodulation logic, so that the demodulation ability is significantly improved.

Description

technical field [0001] The invention relates to the fields of electronic power technology and wireless charging, in particular to a filtering method for demodulating an ASK modulation signal and a wireless charging device. Background technique [0002] As a new technology that is expected to replace wired charging, wireless charging is in increasing demand in the market. The QI protocol formulated by the Wireless Power Consortium (WPC, Wireless Power Consortium) stipulates that RX must use ASK to modulate voltage and current, and TX obtains the ASK envelope signal from the coil-coupled carrier and demodulates it, which makes ASK solution Adjustment is the key technology to become wireless charging. When the modulation signal is selected from the 110Khz-200Khz carrier, the difference between the modulation envelope and the ripple is not large due to the ground bounce or insufficient modulation depth or even the glitch interference of the AC itself, so that the normal modulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/06H04B1/10H02J50/10
CPCH04L27/06H04B1/10H02J50/10
Inventor 詹小强
Owner 四川中微芯成科技有限公司
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