Wireless Power Transmission Coil Misalignment Control
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Solution Overview
Problem
Existing wireless power supply systems fail to regulate power transmission effectively when the positions of the power transmission coil and the power receiving coil shift during wireless power supply, leading to inefficiencies and potential system troubles.
Innovation Solution
A wireless power supply system that includes a power transmission device with a power factor calculator to determine the power factor based on the phase difference between voltage and current, and a power controller to regulate power transmission when the power factor falls below a predetermined threshold, ensuring efficient power delivery and preventing unnecessary power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power supply continues during coil misalignment, then power transmission efficiency deteriorates and system troubles occur, but stopping power supply immediately requires fast detection mechanism
Solution Approach 1:
The system continuously monitors the power factor and uses this feedback to control power transmission. When the power factor drops below a threshold indicating coil misalignment, the control unit automatically regulates or stops power supply, creating a closed-loop control system that prevents energy waste and system troubles while ensuring safe operation
Solution Approach 2:
The patent replaces mechanical position detection methods with electrical parameter monitoring. Instead of using sensors to physically detect coil alignment, the system monitors the power factor (electrical parameter) which changes with misalignment, enabling faster and more reliable detection without additional mechanical components
2Speed
If communication cycle is extended for power control, then control responsiveness decreases, but frequent communication increases system complexity
Solution Approach 1:
The power transmission device autonomously monitors its own operating parameters (power factor) and makes control decisions without requiring continuous communication with the power receiving device. This self-monitoring capability enables fast control responses while minimizing communication requirements and system complexity
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
The system effectively regulates power transmission by reducing power when the power factor drops, preventing inefficiencies and system troubles caused by coil misalignment, and ensuring accurate power control without relying on data from the power receiving controller.
Implementation Method 1
a power transmission coil transmits electric power to a power receiving coil wirelessly
Implementation Method 2
a power factor calculator to calculate a power factor based on a phase difference between a voltage and a current supplied to the power transmission coil
Data Source
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AI summary
A wireless power supply system includes a power transmission device (10) having a power transmission coil (14) and a power receiving device (40) having a power receiving coil (41). The power transmission coil (14) transmits electric power to the power receiving coil (41) via a wireless connection, so as to supply the electric power to a battery (44) installed in the power receiving device (40). The power transmission device (10) includes a power factor calculator (31) configured to calculate a power factor (cosθ) based on a phase difference between a voltage and a current supplied to the power transmission coil (14), and a control amount calculator (29) configured to control electric power supplied to the power transmission coil (14) according to a power command value (Pbat*), and regulate the electric power supplied to the power transmission coil (14) when the power factor falls to a predetermined threshold power factor or less. The power transmission can therefore be regulated immediately when the power receiving coil (41) is shifted from the power transmission coil (14).