Coreless Resonant Transformer With Asymmetric Coil Tuning
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Solution Overview
Problem
Existing coreless power transformers achieve limited power transfer efficiencies due to the constraint of equal component values in their resonant circuits, which restricts design flexibility and magnetic coupling variations.
Innovation Solution
The design introduces a 4-coil coreless transformer system with non-equal resonant circuit component values and different magnetic couplings between coils, allowing for varied inductance, capacitance, and physical structure, thereby enhancing power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If equal component values are used in resonant circuits, then design simplicity is maintained, but power transfer efficiency is limited
Solution Approach 1:
The patent applies asymmetry by using non-equal component values in the two resonant circuits. Specifically, the first resonant circuit has inductance L1 and capacitance C1, while the second resonant circuit has inductance L2 and capacitance C2, where L1 ≠ L2 and/or C1 ≠ C2. This asymmetric configuration allows the natural frequencies to differ (ω1 ≠ ω2), providing additional degrees of freedom in design and enabling higher power transfer efficiency by optimizing magnetic coupling variations without being constrained to identical circuit parameters.
2Loss of energy
If non-equal resonant circuit component values are used, then power transfer efficiency is improved, but design complexity increases
Solution Approach 1:
The patent implements parameter changes by varying the inductance and capacitance values between the two resonant circuits. The first resonant circuit uses parameters L1 and C1, while the second uses L2 and C2, with deliberate differences in these parameters. This allows the natural frequencies ω1 = 1/√(L1C1) and ω2 = 1/√(L2C2) to be different, creating additional design flexibility and enabling optimization of power transfer efficiency through controlled magnetic coupling variations.
3Loss of energy
If equal natural frequencies are used in resonant circuits, then circuit symmetry is maintained, but magnetic coupling variations are restricted
Solution Approach 1:
The patent breaks the symmetry constraint by allowing different natural frequencies in the two resonant circuits. By setting ω1 ≠ ω2 through different L and C values, the system gains additional degrees of freedom in magnetic coupling design. This asymmetric frequency configuration enables more flexible optimization of power transfer efficiency without being constrained to equal frequency operation.
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 approach results in higher transfer efficiency factors, with S21 values exceeding 0.98, compared to traditional designs with equal resonant circuits, which typically achieve S21 values of about 0.967, leading to improved power transfer and reduced losses.
Implementation Method 1
a drive coil (21) that produces magnetic fields
Implementation Method 2
the first resonant coil (22) and the second resonant coil (23) are different in at least one of, or a combination of, the following: (a) the first resonant coil (22) and the second resonant coil (23) have different number of turns
Data Source
AI summary
A primary resonant coil (22) and a secondary resonant coil (23) are different in the proposed improved coreless power transformer design, wherein the differences between the two resonant coils are achieved in two ways: (1) in the first difference, the two resonant coil windings are made to be different; for example, to have different number of turns, turn spacing and/or different wire sizes, and (2) the second difference is with the capacitance values of the two parallel capacitors each used to resonate their respective coils.