Compact Filter Core Layout to Protect Capacitor Noise Attenuation
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Solution Overview
Problem
When miniaturizing filters, the magnetic field generated by the inductor's core can affect the capacitor, leading to a decrease in noise attenuation performance.
Innovation Solution
The filter unit design includes a core with a looped core body and an opposed portion extending to oppose the capacitor, which reduces the magnetic field intensity at the capacitor location, thereby maintaining effective noise attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor is disposed near the core to miniaturize the filter, then the filter size is reduced, but the magnetic field generated by the inductor affects the capacitor and lowers the attenuation performance
Solution Approach 1:
The core is divided into two separate cores (first core and second core) with the capacitor positioned between them. This segmentation allows the magnetic fields from each core to oppose each other, reducing the net magnetic field impact on the capacitor while maintaining compact filter dimensions.
Solution Approach 2:
The patent positions the capacitor between two cores whose magnetic fields act as counterweights to each other. The opposing magnetic fields neutralize each other's effect on the capacitor, preventing the harmful magnetic influence that would otherwise degrade attenuation performance in miniaturized filters.
2Length of moving object
If the filter is miniaturized by placing the capacitor near the core, then compactness is achieved, but noise attenuation performance deteriorates due to magnetic field interference
Solution Approach 1:
The patent creates a specific local arrangement where the capacitor is positioned between two cores in a sandwich configuration. This local spatial quality ensures that the capacitor is exposed to opposing magnetic fields from both cores, which cancel each other's harmful effects, thereby protecting the capacitor from magnetic interference in the compact filter structure.
Solution Approach 2:
The patent converts the harmful magnetic field effect into a beneficial one by arranging two cores to generate opposing magnetic fields. The previously harmful magnetic interference is transformed into a neutralizing effect where the magnetic fields cancel each other out, protecting the capacitor while maintaining miniaturization.
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 enhances noise attenuation performance by minimizing the impact of the magnetic field on capacitors, preventing a decrease in attenuation efficiency, even at higher frequencies and larger currents, without increasing the filter's size.
Implementation Method 1
When current flows through the wire, noise generates a magnetic field at the core
Data Source
AI summary
A filter unit according to the present invention includes a substrate, capacitors mounted on the substrate, and two inductors. The inductors each include a wire and a core. The core includes two core bodies. The core bodies each have a ring shape and include a wiring hole. The capacitors are disposed between the two core bodies. An opposed section extends from the respective two core bodies to a position opposed to the capacitors C. The opposed section is opposed to all of the plurality of capacitors.