Non-contact Power Supply Frequency Tuning for Stable Output
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Solution Overview
Problem
In free layout type non-contact power supply systems, the output power of the power reception device varies significantly depending on its location on the power supply surface, making it difficult to achieve stable power delivery.
Innovation Solution
The operational frequency of the primary coil is set near the resonance frequency corresponding to an intermediate position between primary coils, and a capacitor is used to adjust the resonance system, ensuring stable output power by minimizing the difference in output power across different coil positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the operational frequency is set to match the resonance frequency when the secondary coil is directly opposed to the primary coil, then the output power is maximized at the directly opposed position, but the output power decreases significantly when the secondary coil is positioned at intermediate locations
Solution Approach 1:
The patent applies parameter changes by adjusting the operational frequency of the primary coil to match the resonance frequency when the secondary coil is at an intermediate position rather than directly opposed. This frequency adjustment ensures that the system operates at optimal resonance conditions across multiple coil positions, thereby maintaining stable output power regardless of the secondary coil's location on the power supply surface
2Adaptability or versatility
If the secondary coil is positioned at any location on the power supply surface, then placement flexibility is improved, but the leakage inductance increases and causes significant variation in output power
Solution Approach 1:
The patent utilizes parameter changes by adjusting the operational frequency to compensate for variations in leakage inductance caused by different coil positions. By setting the frequency to match the resonance frequency at intermediate positions, the system maintains optimal power transfer efficiency across the entire power supply surface, enabling flexible placement without significant power loss
3Area of stationary object
If multiple primary coils are arranged along the power supply surface, then the power supply area is expanded, but the complexity of the system increases
Solution Approach 1:
The patent applies merging by using a single operational frequency for all primary coils arranged on the power supply surface. This unified frequency approach allows multiple coils to work together as an integrated system, expanding the power supply area while avoiding the complexity that would arise from independently controlling each coil's frequency and phase
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 configuration maintains stable output power levels regardless of the secondary coil's position, with a reduced power decrease rate from the directly opposed position to the intermediate position, achieving approximately 50% stability compared to traditional systems.
Implementation Method 1
The primary coil L1 is excited at an operational frequency f1. A change in the magnetic flux from the excited primary coil L1 induces current at the secondary coil L2.
Implementation Method 2
a secondary coil configured to induce current using resonance phenomenon based on alternating flux from the primary coils
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A non-contact power supply system comprises: a power supply device which includes a plurality of primary coils which are excited with an operating frequency (f1); and a power receiving device which includes a secondary coil which induces a current on the basis of alternating magnetic fluxes from the primary coils. The operating frequency (f1) which excites the primary coils is set to either a resonant frequency (fb2) or near thereto (fx-fy) of a resonance assembly which is formed when the secondary coil is present in a staggered location between two adjacent primary coils.