Wireless Power Frame Synchronization via Reference Clock
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Solution Overview
Problem
Conventional wireless power feeding systems face interference due to clock errors between the power transmitter and receiver, leading to overlapping time slots and reduced transmission efficiency.
Innovation Solution
A frame control apparatus that generates a reference clock signal, demodulates synchronization commands, and calculates a rate reference value to synchronize communication frames, ensuring aligned time slots and preventing interference in load modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power feeding is performed using conventional clock synchronization methods, then power transmission can be established, but clock errors cause time slot overlap and load modulation interference
Solution Approach 1:
The patent changes the parameter of clock frequency by introducing a reference clock signal with a predetermined frequency that is different from the local oscillation clock. The frame control apparatus adjusts its operation based on the frequency ratio between the reference clock and the local clock, thereby compensating for clock errors and preventing time slot overlap while maintaining reliable communication frame synchronization
Solution Approach 2:
The patent introduces a reference clock signal as an intermediary between the power transmitter and power receiver clock systems. This reference clock serves as a mediator that both parties use to synchronize their frame counting, eliminating direct dependence on each other's potentially erroneous local clocks and preventing load modulation interference
2Device complexity
If frame synchronization is not implemented, then system complexity is reduced, but time slot overlap occurs due to clock errors
Solution Approach 1:
The patent performs preliminary synchronization by having the frame control apparatus count frames based on a predetermined frequency ratio established before communication begins. The apparatus pre-calculates the number of reference clock cycles per frame based on the known frequency relationship, allowing it to synchronize without complex real-time adjustment mechanisms while preventing time slot overlap
Data Source
AI summary
To provide a frame control apparatus for controlling communication frames of a power feeding system, provided is a frame control apparatus that controls communication frames of a wireless power feeding system, the frame control apparatus including a reference clock generating section that generates a predetermined reference clock signal; a demodulating section that operates according to the reference clock signal and demodulates a synchronization command for synchronizing the communication frames; a rate calculating section that counts pieces of rate reference data having a predetermined length and included in the synchronization command, based on the reference clock signal, to calculate a rate reference value used for reference; and a frame control section that controls the communication frames based on the rate reference value.