Self-Centering Ferrite Inductor Assembly for Lower Eddy Current Loss
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Solution Overview
Problem
Conventional inductors in Class-D audio amplifiers suffer from power loss due to inconsistent spacing of the wire core assembly, leading to eddy currents and heating, which affects performance parameters such as total harmonic distortion, noise, and efficiency.
Innovation Solution
The inductor design features ferrite core pieces with self-locating and self-centering wire core assemblies, ensuring a uniform spacing and consistent magnetic characteristics, minimizing eddy currents and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional wire core assembly is used with variable spacing, then manufacturing is easier, but eddy current losses increase causing heating and power loss
Solution Approach 1:
The wire core assembly is pre-formed with a substantially uniform spacing between adjacent windings before insertion into the ferrite core. This preliminary preparation ensures that when the assembly is installed, the uniform spacing is already established, preventing eddy current losses without requiring complex manufacturing processes during final assembly.
Solution Approach 2:
The patent applies a specific structural characteristic (uniform spacing) to the wire core assembly itself, making the quality inherent to the component rather than relying on assembly precision. This local quality approach ensures consistent performance regardless of manufacturing variations in the assembly process.
2Loss of energy
If conventional inductor design is used, then device structure is simpler, but power dissipation increases due to inconsistent magnetic characteristics
Solution Approach 1:
The wire core assembly is pre-formed with uniform spacing and consistent geometry before insertion into the ferrite core. This preliminary preparation ensures that the magnetic characteristics are uniform throughout the inductor, reducing power dissipation without requiring complex manufacturing processes during final assembly.
Solution Approach 2:
The patent changes the key parameter of wire core spacing from variable to substantially uniform. This parameter change fundamentally improves the consistency of magnetic characteristics and reduces power dissipation, while the overall inductor structure remains relatively simple and easy to manufacture.
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 improved inductor design reduces power loss and enhances performance parameters like total harmonic distortion, noise, and efficiency by maintaining uniform magnetic characteristics and reducing eddy currents.
Implementation Method 1
Conventional inductors used in Class-D audio amplifiers suffer from negative performance parameters such as heating and power loss due to eddy currents caused by inconsistent wire core assembly
Implementation Method 2
The purpose of this filter is to attenuate, as much as practically possible, the high-frequency switching waveform generated by the Class-D switching stage
Data Source
AI summary
An inductor is provided, comprising: a first ferrite core piece and a second ferrite core piece, each of which are made of substantially similar materials, exhibit desired electromagnetic properties, and which are fashioned in a substantially similar manner and shape, and wherein each of the first and second ferrite core pieces comprises a substantially planar mating surface, a center post, and a wire core assembly channel, and wherein a first substantially planar mating surface of the first ferrite core piece is adapted to planarly mate with a second substantially planar mating surface of the second ferrite core piece; and a wire core assembly adapted to be substantially self-locating and self-centering about a first or second center post when located in a respective first or second wire core assembly channel.