Multi-Coil Wireless Charging Alignment Using Signal Strength Sensing
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Solution Overview
Problem
Conventional wireless power transmitters with multiple coils face challenges in accurately recognizing wireless power receivers, leading to inefficient charging due to recognition errors and prolonged recognition times, especially when alignment is not suitable for wireless charging.
Innovation Solution
A wireless power transmitter with multiple transmission coils that adjusts the order of sensing signal transmission based on received signal strength indicators to enhance recognition and charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing signals are sequentially transmitted through multiple transmission coils, then the recognition process can identify suitable coils for charging, but the recognition time is prolonged and recognition errors may occur
Solution Approach 1:
The patent applies preliminary action by transmitting sensing signals through all transmission coils simultaneously before the formal recognition process begins. This allows the system to pre-establish signal strength indicators for each coil, so that when a receiver is placed on the charging bed, the controller can immediately identify which coils have strong signal strength and are suitable for charging, without needing to sequentially test each coil during the recognition phase.
Solution Approach 2:
The patent merges the sensing signal transmission function with the recognition process by having multiple transmission coils transmit sensing signals simultaneously rather than sequentially. This combination allows the system to gather information from all coils at once, improving recognition speed while maintaining accuracy through the collective data from multiple coils working together.
2Reliability
If sensing signals are repeatedly transmitted through multiple transmission coils to reduce recognition errors, then recognition accuracy improves, but the time required for recognition increases
Solution Approach 1:
The patent performs preliminary transmission of sensing signals through all transmission coils before the actual recognition process. This preliminary action establishes baseline signal strength indicators for each coil, allowing the system to reliably identify suitable coils in a single recognition pass without needing multiple repeated transmissions, thus maintaining high reliability while reducing recognition time.
Solution Approach 2:
The system uses the signal strength indicators automatically generated during preliminary sensing signal transmission to self-identify which transmission coils are suitable for charging. This self-service mechanism eliminates the need for repeated recognition attempts, as the system can directly determine the best coils based on the pre-established signal strength data, improving both reliability and speed.
3Adaptability or versatility
If multiple transmission coils are used to increase recognition rate, then charging coverage is improved, but the complexity of controlling signal transmission order increases
Solution Approach 1:
The patent applies preliminary action by having all transmission coils transmit sensing signals simultaneously before recognition begins. This eliminates the need for complex control of signal transmission order among multiple coils, as all coils operate in parallel during the preliminary phase. The controller simply needs to identify which coils show strong signal strength indicators, greatly simplifying the control complexity while maintaining broad charging coverage.
Solution Approach 2:
The patent makes the transmission coil selection dynamic by allowing the system to adaptively choose which coils to use for charging based on real-time signal strength indicators. Rather than requiring predetermined control of signal transmission order, the system dynamically identifies suitable coils from the group, enabling flexible adaptation to different receiver positions and orientations while simplifying control logic.
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
Improves recognition rate and reduces recognition time, enhancing device efficiency and user convenience by optimizing the alignment and charging process.
Implementation Method 1
Wireless power transmission (wireless energy transfer) technology is a technology for wirelessly transmitting electrical energy from a transmitter to a receiver using an electromagnetic induction principle
Implementation Method 2
Wireless power transmission (wireless energy transfer) technology is a technology for wirelessly transmitting electrical energy from a transmitter to a receiver using an electromagnetic induction principle
Data Source
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AI summary
A wireless power transmitter having a plurality of transmission coils is disclosed. The present transmitter comprises: first to Nth coils; and a control unit for transmitting, to a wireless power receiver, a first sensing signal through the first to Nth coils, and adjusting transmission orders of the first to Nth coils for transmitting a second sensing signal, on the basis of the signal strength of a received first signal strength indicator when the first signal strength indicator corresponding to the first sensing signal is received, wherein the control unit can transmit, to the receiver, the second sensing signal through the first to Nth coils on the basis of the adjusted transmission orders. Therefore, device efficiency and user convenience can be improved.