Wireless Power Transmission System with Dynamic Resonant Frequency Tracking
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Solution Overview
Problem
Current wireless charging technologies face challenges in efficiently transmitting power over reasonable distances and accommodating flexible placement and orientation of antennas, leading to inefficient charging and potential interference with other systems.
Innovation Solution
A wireless power transmission system that includes a transmit antenna, an amplifier, a load sensing circuit, and a controller, along with monitoring devices equipped with sensors and unique IDs, which detect presence and power consumption changes to manage power transmission and tracking within a wireless charging zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If plane wave radiation coupling is used for wireless power transmission, then power can be transmitted over distance, but power coupling efficiency falls off quickly with distance
Solution Approach 1:
The system dynamically adjusts the resonant frequency of both transmitting and receiving antennas to match, creating a resonant coupling condition that maintains efficient power transfer over distance. The controller modifies operating parameters in real-time to optimize the resonant coupling between antennas separated by significant distances.
Solution Approach 2:
The patent changes the operating frequency parameter to achieve resonant coupling. By tuning both transmitting and receiving antennas to the same resonant frequency, the system overcomes the rapid efficiency decay that occurs with distance in non-resonant plane wave coupling.
2Quantity of substance
If inductive coupling between transmit and receive antennas is used, then multiple devices can be charged simultaneously, but spacing between antennas must be very close
Solution Approach 1:
The system uses dynamic resonant frequency adjustment to extend the coupling distance beyond traditional inductive coupling limits. This allows multiple devices to be charged simultaneously at greater spacings while maintaining efficient power transfer through resonant coupling between the transmit antenna and each receive antenna.
3Object-affected harmful factors
If plane wave radiation is used for wireless power transmission, then interference with other systems can occur, but filtering to control interference adds system complexity
Solution Approach 1:
The patent changes the operating frequency to a resonant condition that is selective to the intended receiving antenna. This resonant frequency selection naturally suppresses interference with other systems operating at different frequencies, reducing the need for complex filtering while maintaining controlled 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
Enables efficient and flexible wireless power transmission to multiple devices with improved charging efficiency and reduced interference, allowing for tracking and reporting of monitoring devices within the charging zone.
Implementation Method 1
One is based on the coupling of plane wave radiation (also called far-field radiation) between a transmit antenna and a receive antenna on the device to be charged
Implementation Method 2
The receive antenna collects the radiated power and rectifies it for charging the battery
Implementation Method 3
Other approaches to wireless energy transmission techniques are based on inductive coupling between a transmit antenna embedded, for example, in a 'charging' mat or surface and a receive antenna (plus a rectifying circuit) embedded in the electronic device to be charged
Data Source
AI summary
A wireless power transmission system includes, a transmit antenna which in operation produces a wireless field, an amplifier coupled to the transmit antenna, a load sensing circuit coupled to the amplifier and a controller coupled to the load sensing circuit. A monitoring device has one or more sensors and a unique user ID. The one or more sensors acquire user information selected from of at least one of, a user's activities, behaviors and habit information. The monitoring device includes an ID circuitry. A communication interface receives information about the unique user ID when the load sensing circuit indicates the monitoring device is within the wireless field. The indication is created using at least a change in power consumption.