Multi-Band Wireless Power Platform for Receiver Detection and Charging
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Solution Overview
Problem
Existing wireless charging systems are poorly suited for environments requiring simultaneous charging of multiple devices, often interfere with other wireless communication systems, and struggle to identify and power batteryless devices operating at different frequency bands, leading to inefficiencies and interference.
Innovation Solution
The development of wireless power transmission systems with programmable wireless power transmission (WPT) capabilities, including multi-band antennas and repeater devices that can detect and classify RF signals, modulate output signals to reduce interference, and provide power to active and inactive receivers across various frequency bands, while synchronizing with existing communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless charging systems use fixed frequency bands, then they can provide stable power transmission, but they cannot support multiple receiving devices operating at different frequency bands simultaneously
Solution Approach 1:
The system dynamically switches between different frequency bands (902-928 MHz and 2.4 GHz) based on the requirements of receiving devices. The transmitter can adapt its operating frequency in real-time to match the capabilities of active and inactive receivers, enabling support for multiple devices with different frequency preferences without requiring multiple fixed-frequency transmitters.
Solution Approach 2:
The wireless power transmitter is designed to perform multiple functions across different frequency bands. A single transmitter unit can communicate with and power various types of receivers (active and inactive) operating at different frequencies, eliminating the need for separate dedicated transmitters for each frequency band and reducing overall system complexity.
2Reliability
If wireless power transmitters use high power signals, then they can energize inactive receivers, but they cause interference with other wireless communication systems
Solution Approach 1:
The system uses periodic signal transmission with controlled duty cycles to energize inactive receivers. By transmitting power signals in periodic bursts rather than continuously, the system can detect the presence of inactive receivers, deliver sufficient energy to activate them, and then reduce or pause transmission to minimize interference with other wireless communication systems operating in the same or adjacent bands.
Solution Approach 2:
The transmitter applies different signal characteristics to different spatial and functional zones. High-power signals are directed specifically toward areas where inactive receivers are detected, while other areas maintain lower power levels to avoid unnecessary interference. The system also applies different modulation and frequency characteristics locally adapted to the specific receiver being energized.
3Productivity
If wireless charging systems require specific device positioning, then they can achieve efficient power transfer, but they are poorly suited for environments with multiple receiving devices
Solution Approach 1:
The system segments the power transmission process into distinct phases: detection phase (identifying active and inactive receivers), classification phase (categorizing receivers by type and frequency requirements), and energization phase (delivering power to specific receivers). This segmentation allows the transmitter to efficiently manage multiple devices by handling them in organized groups rather than requiring all devices to be perfectly positioned simultaneously.
Solution Approach 2:
The system introduces an intermediary classification mechanism that identifies and categorizes receivers before power delivery. By classifying devices as active or inactive and determining their frequency requirements, the transmitter can intermediate between the power source and multiple diverse receivers, enabling efficient power distribution to multiple devices without requiring precise positioning of all devices at once.
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
Enables efficient wireless power delivery to multiple devices simultaneously, reduces interference with other wireless communication systems, and ensures reliable power supply to batteryless devices by identifying and adapting to different frequency bands, enhancing the functionality of IoT systems and ambient harvesting systems.
Implementation Method 1
an antenna configured for coplanar, collocated dual-band operation... The antenna is capable of transmitting signals at a first frequency in a first band and a second frequency in a second band
Implementation Method 2
a first element of the antenna is formed by a circuit board trace on a circuit board
Data Source
AI summary
Methods and devices for surveying for active and inactive power receivers within a wireless-power coverage area are described. A method includes causing performance of a survey looking for active power receivers within a wireless-power coverage area using communication radio(s). Information is received from an active power receiver and transmission of RF signals is caused to energize inactive power receivers using a power-transmission antenna. A first RF signal is transmitted using a first value for a transmission characteristic, and a second RF signal is transmitted using a second value for the transmission characteristic. Additional information is received from a first energized power receiver and further information from a second energized power receiver. Two or more frequency bands are identified for radio-frequency wireless-power transmissions by a wireless-power transmitting device within the wireless-power coverage area based on the information, the additional information, and the further information.