Wireless Power Transmitter Using Pilot Signal Reflection for Position Detection
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Solution Overview
Problem
Conventional electromagnetic wave-based wireless charging systems are inefficient in determining the position of electronic devices quickly, especially when the devices are in motion or obstructed, leading to potential harm and reduced charging efficiency.
Innovation Solution
A wireless power transmitting device that sends out pilot signals in multiple directions, analyzes reflections to determine the position of electronic devices, and adjusts RF wave formation to avoid obstacles, enabling efficient charging by comparing reference information with real-time signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RF waves are formed in multiple directions to determine the position of an electronic device, then the position determination capability is improved, but the time required for position determination increases significantly
Solution Approach 1:
The system performs preliminary actions by sending out pilot signals in multiple directions before actual power transmission begins. These pilot signals are used to pre-determine the position of the electronic device, allowing the main power transmission to start immediately without waiting for position determination. This resolves the contradiction by separating the position determination phase from the power transmission phase.
Solution Approach 2:
The position determination function is extracted from the main power transmission process. Instead of determining position continuously during power transmission, the system extracts position determination as a separate preliminary step using pilot signals, then uses the determined position to guide the focused power transmission.
2Power
If high-power transmission is performed to enable remote power transmission, then the power transmission capability is improved, but the risk of harm to human bodies increases before target detection
Solution Approach 1:
The system performs preliminary position determination using low-power pilot signals before initiating high-power transmission. This ensures that the electronic device's position is confirmed and safe to transmit power to, eliminating the risk of high-power exposure to unintended targets including human bodies. The pilot signal phase acts as a safety check before full power engagement.
Solution Approach 2:
The system takes preliminary anti-action by using pilot signals to detect and avoid potential harmful effects before they occur. By determining the position of the electronic device first, the system prevents high-power transmission from affecting unintended objects, thereby counteracting potential harm before it can manifest.
3Ease of operation
If the electronic device is allowed to move freely, then the ease of operation is improved, but the charging efficiency decreases due to frequent position changes
Solution Approach 1:
The system dynamically adapts to the electronic device's movement by continuously or periodically determining its position using pilot signals. This allows the device to move freely while the system adjusts the power transmission focus to track the device's new position, maintaining charging efficiency despite mobility. The dynamic position determination enables the system to respond to position changes without interrupting charging.
Solution Approach 2:
The system uses feedback from pilot signal reflections to detect position changes of the electronic device. By analyzing the reflected pilot signals, the system receives feedback about the device's current position and adjusts the power transmission accordingly, ensuring continuous efficient charging even as the device moves.
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 allows for swift and accurate determination of electronic device positions and efficient wireless charging, even when obstacles are present, enhancing safety and charging efficiency.
Implementation Method 1
sends out pilot signals in multiple directions and analyzes reflections thereof
Implementation Method 2
electromagnetic wave type may advantageously work for a few meters of remote power transmission
Data Source
AI summary
A wireless power transmitting device is provided. The wireless power transmitting device may comprise an antenna, a memory, and a processor configured to control to store, as reference information, information of a first reflected signal of a pilot signal sent out through the antenna at a first time in the memory and control to compare the reference information with information about second reflected signals of a pilot signal sent out through the antenna at a second time, and determine a position of a target for detection based on a result of the comparison.