Adjustable Electromagnetic Induction Coil for Wireless Power
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Solution Overview
Problem
Conventional wireless power supply systems using resonance-type electromagnetic induction coils face efficiency issues due to impedance mismatch caused by variations in inter-coil distance and position deviations, which are typically addressed with variable capacitors that are difficult to implement effectively, especially at kHz frequencies.
Innovation Solution
The electromagnetic induction coil incorporates an adjustment mechanism, such as a wedge or turn back portion, to adjust the number of turns of the coil main body, allowing for impedance matching without the need for a variable capacitor, thereby maintaining high transmission efficiency across varying inter-coil distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a variable capacitor is used to adjust impedance for varying inter-coil distances, then transmission efficiency can be optimized, but device complexity increases and ease of manufacture deteriorates
Solution Approach 1:
The patent extracts the impedance adjustment function from the capacitor and relocates it to the coil structure itself. By making the coil turns adjustable directly, the system eliminates the need for variable capacitors while maintaining the ability to optimize transmission efficiency across different inter-coil distances
Solution Approach 2:
The coil structure is designed to serve multiple functions: it acts as both the electromagnetic induction element and the impedance adjustment mechanism. The adjustable turns allow the same coil to adapt to various operating conditions without requiring separate adjustment components
2Ease of manufacture
If the number of coil turns is fixed, then manufacturing simplicity is maintained, but adaptability to varying inter-coil distances deteriorates
Solution Approach 1:
The patent transforms the static coil structure into a dynamic one where the number of active turns can be adjusted. This is achieved through a movable contact mechanism that allows selective engagement of different portions of the coil wire, enabling the system to adapt to varying inter-coil distances while maintaining manufacturing simplicity
Solution Approach 2:
The coil is designed with segmented or divisible turns that can be selectively activated. The adjustable contact allows the system to engage only the necessary number of turns based on operating conditions, providing adaptability without requiring multiple separate coil components
3Loss of energy
If impedance adjustment mechanism is added, then transmission efficiency across varying distances is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements a self-adjusting mechanism where the movable contact automatically positions itself based on the inter-coil distance. This eliminates the need for manual intervention or complex control systems, allowing the coil to self-optimize its impedance for the current operating condition
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 enables efficient non-contact power supply by adjusting impedance through the coil turn adjustments, maintaining high efficiency and eliminating the need for variable capacitors, while also simplifying the adjustment process and minimizing load on the coil.
Implementation Method 1
The primary electromagnetic induction coil 104 is connected to the AC power supply 101. The primary resonance coil 105 is supplied with power from the primary electromagnetic induction coil 104 by electromagnetic induction.
Implementation Method 2
The primary resonance coil 105 is supplied with power from the primary electromagnetic induction coil 104 by electromagnetic induction. As a result, magnetic field resonance is caused between the primary resonance coil 105 and the secondary resonance coil 106.
Data Source
AI summary
A primary electromagnetic induction coil, which supplies power to a primary resonance coil in a pair of a primary and a secondary resonance coils that conduct non-contact power supply by magnetic field resonance, includes a coil main body and a wedge that mounts an end portion of the coil main body to separate the end portion from other portions. Impedance matching can be achieved by adjusting a position of the wedge and a number of turns of the coil main body.