Wireless Power Transfer Positioning via Transmitter Current Adjustment
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Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies when the power transmitting and receiving sides are not aligned optimally, leading to reduced power transfer efficiency and potential overheating, as they can only determine the optimal position during specific phases and require complex circuitry to calculate real-time efficiency.
Innovation Solution
A wireless power transfer system with a resonant transmitting and receiving circuit, including a control unit, transmitter coil, and receiver coil, that adjusts the transmitter current based on the resonant receiver voltage to regulate the power transfer and determine the shift distance from the optimal position, allowing for optimal efficiency determination during the ping, negotiation, and power transfer phases, and provides user feedback through an indicator device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power transmitting side increases the transmitted current to raise the received power to target level, then the received power is improved, but the power transmitting side suffers overheat and protection function triggers reducing transmitted power
Solution Approach 1:
The system performs preliminary sensing during the ping phase to detect the optimal relative position and shift distance before actual power transfer begins. This preliminary detection allows the system to pre-adjust the transmitter-receiver positioning or parameters, ensuring optimal power transfer efficiency from the start and avoiding the need to increase transmitted current later, thus preventing overheating.
2Loss of energy
If the power transmitting side and power receiving side are not well aligned, then the power transfer efficiency is reduced, but the system lacks real-time positioning detection capability to guide alignment adjustment
Solution Approach 1:
The system implements a feedback mechanism where the power receiving side sends voltage level signals back to the control unit during the ping phase. Based on this feedback, the system determines the shift distance from the optimal position and provides guidance to users for alignment adjustment. This closed-loop feedback enables real-time monitoring and guidance of the alignment process, making it convenient for users to achieve optimal positioning.
Solution Approach 2:
The system replaces complex mechanical alignment mechanisms with electromagnetic field-based sensing and signal processing. Instead of using mechanical sensors or physical adjustment mechanisms, the system uses the electromagnetic coupling between transmitter and receiver coils to detect relative position and provides electronic guidance, simplifying the alignment process.
3Measurement precision
If the system uses complex circuitry to sense both transmitting and receiving side voltages and currents for real-time efficiency calculation, then the positioning accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The system extracts only the essential information needed for positioning detection - the voltage level signal from the power receiving side during the ping phase. By focusing on this single critical parameter rather than measuring all four quantities (transmitter voltage, transmitter current, receiver voltage, receiver current), the system achieves sufficient positioning accuracy with significantly reduced circuit complexity.
Solution Approach 2:
The system uses the voltage level signal as a proxy or copy of the overall power transfer efficiency state. Instead of directly measuring and processing all electrical parameters, the system relies on the voltage level indication which correlates with the relative position and coupling efficiency, simplifying the measurement system while maintaining positioning accuracy.
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 rapid determination of the optimal relative position during all phases, improving power transfer efficiency by adjusting the transmitter current and providing user guidance to align the devices, thus preventing overheating and reducing power loss.
Implementation Method 1
a receiver coil configured to operably generate a resonant receiver voltage by induction with the transmitter coil
Implementation Method 2
a resonant transmitting circuit and a resonant receiving circuit, wherein the resonant receiving circuit includes a receiver coil configured to operably generate a resonant receiver voltage by induction with the transmitter coil
Data Source
AI summary
A wireless power transfer system includes: a transmitting side, which includes a resonant transmitting circuit, the resonant transmitting circuit including a transmitter coil; and a receiving side, which includes a resonant receiving circuit, the resonant receiving circuit including a receiver coil for performing induction with the transmitter coil to generate a resonant receiver voltage, wherein the transmitter adjusts a transmitter current of the resonant transmitting circuit according to the resonant receiver voltage such that the resonant receiver voltage is regulated to a target voltage level. The wireless power transfer system determines a shift distance from a present relative position to an optimal relative position according to the adjusted transmitter current of the resonant transmitting circuit.