Conductive Case Wireless Power Supply Antenna Efficiency
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Solution Overview
Problem
Existing wireless power supply technologies face challenges in downsizing antennas while maintaining sufficient power transmission efficiency, especially when using high-frequency microwaves, and require directivity and three-dimensional installation spaces, which can lead to safety concerns and inefficiencies.
Innovation Solution
A wireless power supply device utilizing an electrically-conductive case to confine and reflect microwaves, allowing inverted-F antennas without directivity to operate efficiently, with the power transmitting and receiving antennas formed on substrate surfaces, enabling high-frequency microwave use without escaping radiation or the need for three-dimensional spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high-frequency microwaves are used for wireless power supply, then antenna size can be reduced, but transmission efficiency deteriorates and radiation may escape
Solution Approach 1:
The patent converts the harmful radiation loss into a beneficial reflection mechanism by enclosing the antennas within a conductive case. The microwaves that would otherwise escape and cause energy loss are now reflected by the conductive case walls back toward the receiving antenna, transforming the harmful radiation into useful reflected energy that improves transmission efficiency while allowing high-frequency operation with smaller antennas
2Loss of energy
If directional antennas are used to improve transmission efficiency, then power transmission efficiency is improved, but device complexity and installation space requirements increase
Solution Approach 1:
The conductive case serves multiple functions simultaneously: it acts as a microwave reflector to improve transmission efficiency, provides structural enclosure for the antenna system, and eliminates the need for complex directional antenna configurations. This multi-functional approach achieves high transmission efficiency while maintaining simple isotropic antenna designs that are easier to manufacture and install
3Power
If microwaves are radiated at high power to achieve sufficient received power, then received power is sufficient, but harmful effects on humans and electronic circuits occur
Solution Approach 1:
The conductive case contains the high-power microwave radiation that would otherwise pose safety hazards. By reflecting the microwaves within the enclosed space, the system achieves sufficient received power while preventing harmful radiation from escaping to affect humans or nearby electronic circuits, thus converting what would be a harmful high-power radiation into a safe and effective power transmission
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 configuration achieves high transmission efficiency and safety by ensuring microwaves are contained within the conductive case, allowing downsized antennas to provide sufficient power to loads even at distances, without adverse effects on humans or electronic circuits.
Implementation Method 1
an electrically-conductive case surrounded by an electrically-conductive plate in which the power transmitting antenna and the power receiving antenna are accommodated. In the electrically-conductive case, a microwave radiated from the power transmitting antenna is received by the power receiving antenna
Implementation Method 2
a power transmitting antenna; a power supply circuit configured to supply a microwave to the power transmitting antenna; a power receiving antenna; a power receiving circuit configured to receive supply of power of the microwave via the power receiving antenna
Data Source
AI summary
A wireless power supply device includes: a power transmitting antenna; a power supply circuit configured to supply a microwave to the power transmitting antenna; a power receiving antenna; a power receiving circuit configured to receive supply of power of the microwave via the power receiving antenna; a load configured to operate using the power supplied by the power receiving circuit; and an electrically-conductive case surrounded by an electrically-conductive plate in which the power transmitting antenna and the power receiving antenna are accommodated. In the electrically-conductive case, a microwave radiated from the power transmitting antenna is received by the power receiving antenna, and power of the microwave is supplied to the load from the power receiving circuit.