Wireless Power Transfer Coil Control for Standby Current Reduction
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Solution Overview
Problem
Existing wireless power transfer systems experience standby current issues in power transmission coils when they are not opposing the power reception coil, leading to inefficiencies and increased power consumption.
Innovation Solution
A wireless power transfer system that includes a power conversion unit, multiple power transmission units with power transmission coils, a control unit, and position detection units. The control unit selectively supplies power to power transmission units based on the position of a mobile body, ensuring that power is only transmitted when the distance between the power transmission coil and the power reception coil is within a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is continuously supplied to power transmission coils to ensure readiness for power transfer, then power transfer reliability is improved, but standby current increases leading to energy waste
Solution Approach 1:
The system dynamically adjusts the power supply state of transmission coils based on real-time position detection. When a mobile body is detected within the power transfer region, the corresponding transmission coil is activated; when no mobile body is present, the coil is deactivated. This dynamic on-demand power supply resolves the contradiction between maintaining readiness and reducing standby current.
Solution Approach 2:
The system implements feedback control through position detection units that continuously monitor the presence of mobile bodies. The detection results are fed back to the control unit, which adjusts the power supply state accordingly. This closed-loop feedback mechanism ensures reliable power transfer when needed while minimizing energy consumption during idle periods.
2Area of stationary object
If multiple power transmission units are deployed to cover larger areas, then power transfer coverage is improved, but system complexity and power consumption increase
Solution Approach 1:
The power transfer system is divided into multiple independent power transmission units, each equipped with its own position detection and control capabilities. Each unit can independently detect mobile bodies and adjust power supply based on local conditions. This segmentation allows the system to cover larger areas while maintaining manageable complexity through modular, decentralized control.
Solution Approach 2:
Each power transmission unit operates independently with localized control, detecting and responding to mobile bodies within its specific coverage area. This local quality approach allows different regions to be managed autonomously, reducing overall system complexity while achieving comprehensive coverage through the coordination of multiple specialized units.
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 solution reduces standby current in power transmission coils by ensuring that power is only supplied when the coils are in the correct opposing position, thereby enhancing efficiency and reducing power consumption.
Implementation Method 1
a power transmission coil; a power reception coil
Data Source
AI summary
A wireless power transfer system comprises: a power conversion unit generating power to be transmitted to a power reception coil; a power transmission unit group constituted by two or more power transmission units, each power transmission unit having a power transmission circuit including a power transmission coil; a control unit controlling supply of power from the power conversion unit to the power transmission unit group; and a position detection unit detecting a position of a mobile body. The control unit, based on position information, supplies power from the power conversion unit to a power transmission unit group that satisfies a power transmission condition including that a distance of the power transmission coil relative to the power reception coil of the mobile body is less than or equal to a predetermined threshold, and does not supply power to a power transmission unit group that does not satisfy the power transmission condition.