Wireless Power Transmission Frequency Sweep Pattern
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in minimizing radiated emission interference between multiple power transmission apparatuses, as frequency diffusion techniques can lead to overlapping frequencies, enhancing mutual interference, while operating at different frequencies results in inefficient frequency usage.
Innovation Solution
Implementing a power transmission circuitry that generates a magnetic field using AC current and control circuitry to change the frequency of the AC current in a specific order, synchronizing frequency transitions among multiple power transmission apparatuses to prevent simultaneous use of the same frequency, thereby reducing radiated emission through unique sweep patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If frequency diffusion is used to reduce radiated emission, then radiated emission intensity is reduced, but frequencies of multiple power transmission apparatuses become identical at certain timing, enhancing mutual interference
Solution Approach 1:
The patent applies dynamics by making the frequency assignment dynamic rather than static. Multiple power transmission apparatuses dynamically switch between different frequencies in a time-varying manner, with each apparatus using a different frequency at any given time instant. This dynamic frequency hopping approach ensures that while frequency diffusion reduces individual radiated emission intensity, the coordinated dynamic allocation prevents frequency overlap and mutual interference between multiple apparatuses.
2Object-affected harmful factors
If multiple power transmission apparatuses operate at different frequencies, then mutual enhancement of emission is avoided, but certain apparatuses use only inefficient frequencies, causing inequality among apparatuses
Solution Approach 1:
The patent implements periodic action through time-varying frequency allocation. Each power transmission apparatus periodically cycles through different frequencies in a coordinated manner, ensuring that at any time instant, each apparatus operates on a different frequency to avoid mutual interference. Over the periodic cycle, each apparatus accesses both efficient and inefficient frequencies, achieving fairness and equality among all apparatuses while maintaining low mutual interference throughout the operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces radiated emission by ensuring that multiple power transmission apparatuses do not use the same frequency at the same time, maintaining efficient power transfer while minimizing interference and frequency inefficiencies.
Implementation Method 1
power transmission circuitry configured to generate a magnetic field by AC current flowing through a coil, and to transmit AC power by coupling the magnetic field with a coil of a power reception apparatus
Data Source
AI summary
According to one embodiment, power transmission circuitry configured to generate a magnetic field by AC current flowing through a coil, and to transmit AC power by coupling the magnetic field with a coil of a power reception apparatus, wherein a frequency of the AC current is higher than a frequency of AC power supply to the power transmission apparatus; and control circuitry configured to change a frequency of the AC current in accordance with a first order of first to n-th frequencies during a power transmission of the power transmission circuitry, wherein the first order comprises each of the first to n-th frequencies one time.