Wireless Charging Metal Frequency-Selective Box
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Solution Overview
Problem
Existing microwave radiation energy transmission methods face challenges in efficiently transmitting energy in complex environments, particularly in closed metal boxes, with high energy scattering loss, poor directivity, and interference with other electronic devices, limiting their application in wireless charging of mobile devices.
Innovation Solution
A wireless charging device and system utilizing a metal frequency-selective box with a multi-antenna subsystem and adaptive spatial focusing technology, allowing for high-efficiency electromagnetic wave confinement within the box while enabling communication frequencies to penetrate, ensuring efficient energy transmission and maintaining device communication capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If microwave radiation energy transmission methods are used to achieve long-distance wireless energy transmission, then energy transmission distance is improved, but transmission efficiency deteriorates due to high energy scattering loss
Solution Approach 1:
The patent divides the single antenna system into multiple antenna units (at least three) arranged in specific geometric configurations. Each antenna unit transmits segmented portions of the electromagnetic energy, which collectively form a focused energy beam at the target location, reducing energy scattering loss while maintaining transmission distance
Solution Approach 2:
The patent combines multiple antenna units to transmit electromagnetic energy simultaneously. By coordinating the phase and amplitude of each antenna unit, the system merges their individual energy beams into a single focused beam at the target, achieving both long transmission distance and high transmission efficiency
2Stability of the object's composition
If antenna arrays are designed to realize directional radiation of energy, then directivity is improved, but device complexity increases due to optimization requirements of receiving system and rectifier circuit
Solution Approach 1:
Instead of optimizing the receiving system and rectifier circuit to achieve directional energy reception, the patent inverts the approach by using multiple transmitting antenna units with controlled phase and amplitude to create directional energy transmission. This shifts the complexity from the receiving end to the transmitting end, simplifying the receiving system
3Length of stationary object
If microwave power sources and antenna arrays are designed for long-distance wireless energy transmission, then energy transmission distance is improved, but electromagnetic interference to other electronic devices increases
Solution Approach 1:
The patent concentrates electromagnetic energy into a focused beam at the specific target location by coordinating multiple antenna units with controlled phase and amplitude. This localizes the high-energy region precisely at the receiver, while areas along the transmission path experience reduced electromagnetic interference, enabling long-distance transmission with minimized harmful effects
4Loss of energy
If frequency-selective surfaces are used to confine charging frequencies, then transmission efficiency is improved, but communication frequencies may be blocked
Solution Approach 1:
The patent incorporates communication frequency detection functionality that monitors the electromagnetic environment and identifies active communication frequencies. Based on this feedback, the system dynamically adjusts the frequency-selective surface parameters or antenna transmission frequencies to avoid interfering with communication signals, thereby maintaining both high transmission efficiency and communication adaptability
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
The solution achieves high transmission efficiency of up to 80-90% while allowing mobile devices to maintain communication and data access during charging, using a band-pass frequency-selective network to confine charging frequencies and allow communication frequencies to pass through, thus providing a novel and environmentally friendly wireless charging solution.
Implementation Method 1
a metal frequency-selective box; and an internal charging system disposed inside the metal frequency-selective box for wireless charging
Implementation Method 2
The N antenna units are evenly disposed, in a two-dimensional ring, on inner sides of four side faces of the metal frequency-selective box
Implementation Method 3
using a band-pass frequency-selective network to confine charging frequencies and allow communication frequencies to pass through
Implementation Method 4
an internal charging system disposed inside the metal frequency-selective box for wireless charging. The internal charging system comprises a multi-antenna subsystem comprising N antenna units
Data Source
AI summary
The disclosure provides a wireless charging device including a metal frequency-selective box and an internal charging system disposed inside the metal frequency-selective box for wireless charging. The internal charging system includes a multi-antenna subsystem including N antenna units; N is an integer greater than 2, and the antenna units are dipole antennas, microstrip patch antennas, microstrip slot antennas, helical antennas, or dielectric resonator antennas. The N antenna units are evenly disposed, in a two-dimensional ring, on inner sides of four side faces of the metal frequency-selective box, or disposed on a three-dimensional curved surface of the entire inner side of the metal frequency-selective box. The device to be energized is disposed in the metal frequency-selective box and is surrounded by the N antenna units.