Switching Device Coil With Conical Winding Geometry
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Solution Overview
Problem
Conventional coils used in high-frequency switching devices have inadequate power-carrying capacity, leading to resonance issues that result in power loss and heating, especially at high transmission powers.
Innovation Solution
A coil design with varying winding diameters and spacings, where the first winding has a larger diameter and smaller spacing than the last, and additional windings with intermediate diameters and spacings, reducing resonances and enhancing power-carrying capacity, along with a coil former that can be filled with air or a synthetic material for improved cooling and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coils are filled with iron core to achieve desired electrical properties, then the electrical properties are improved, but the power-carrying capacity is reduced
Solution Approach 1:
The patent removes the iron core from the coil structure entirely, replacing it with air or low-permeability material. This extraction eliminates the saturation issue that limited power-carrying capacity while maintaining electrical properties through the optimized winding geometry with varying diameter and spacing.
Solution Approach 2:
The patent changes the geometric parameters of the windings by implementing a conical structure where winding diameter and spacing vary along the length. This parameter variation optimizes the magnetic field distribution and inductance characteristics without requiring iron core material, thereby achieving both good electrical properties and high power-carrying capacity.
2Device complexity
If resonances occur in the coil at high transmission powers, then power loss increases and heating occurs, but the coil structure remains simple
Solution Approach 1:
The varying winding parameters (diameter and spacing) along the conical structure fundamentally change the resonant frequency characteristics of the coil. This geometric parameter variation distributes the magnetic field more evenly and pushes resonances to frequencies outside the operating range, reducing power loss and heating without adding complex damping components.
3Reliability
If parallel resistors are used to attenuate coil resonances, then resonance effects are reduced, but losses increase significantly at large powers
Solution Approach 1:
The patent removes the parallel resistor damping approach entirely and instead uses the inherent geometric properties of the conical winding structure to control resonances. This extraction of the resistive damping element eliminates the associated power losses while still achieving resonance attenuation through optimized winding geometry.
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 coil achieves a high power-carrying capacity of at least 500 W, specifically up to 10 kW within the 600 MHz frequency range, with reduced resonances and improved cooling, allowing for efficient high-power signal switching.
Implementation Method 1
a coil (2) with several windings (83), wherein a first winding (85) of the coil (2) provides a first winding diameter and a first winding spacing, wherein a last winding (86) provides a second winding diameter and a second winding spacing
Data Source
AI summary
A coil provides several windings. A first winding is a winding at one edge of the coil, which provides a given first winding diameter and a given first winding spacing relative to the next winding. At the other end of the coil, a last winding provides a given second winding diameter and a given second winding spacing relative to the adjacent winding. In this context, the first winding diameter is larger than the second winding diameter. The first winding spacing in this context is smaller than the second winding spacing.