Frequency-Dependent Resistance Element Using Ni-Zn-Cu Ferrite
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Solution Overview
Problem
Existing frequency-dependent resistance elements face challenges in achieving ideal frequency characteristics, leading to signal waveform deformation and phase delay due to reactance components, and the method of adding a separate oxide film on inductors is complex and not suitable for size reduction.
Innovation Solution
A frequency-dependent resistance element is created using a Ni—Zn—Cu-based ferrite material with specific composition ranges for Fe, Zn, Ni, and Co, where the molar ratio of Ni to Zn and the amount of Co are adjusted to achieve a resistance component that sharply increases at higher frequencies, minimizing reactance and maintaining signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an impedance element with large resistance component is used to absorb noise efficiently, then noise absorption is improved, but signal waveform deformation and phase delay increase due to reactance component
Solution Approach 1:
The patent applies parameter changes by optimizing the composition ratios of Fe, Zn, Ni, and Cu in the ferrite material, along with controlling sintering temperature and atmosphere parameters. These parameter adjustments achieve frequency-dependent resistance characteristics where resistance increases at noise frequencies while maintaining low reactance at signal frequencies, thus resolving the contradiction between noise absorption and signal integrity
Solution Approach 2:
The patent uses composite ferrite material containing multiple metal elements (Fe, Zn, Ni, Cu) in specific proportions. This composite material structure enables simultaneous achievement of high resistance at high frequencies for noise absorption and low reactance at signal frequencies, preventing signal waveform deformation and phase delay
2Reliability
If a separate oxide film is disposed on the surface of the inductor to provide resistance, then frequency characteristics are improved, but manufacturing complexity and production time increase
Solution Approach 1:
The patent merges the resistance-providing function into the ferrite material body itself rather than using a separate oxide film. The ferrite material inherently provides the required resistance characteristics through its composition and microstructure, eliminating the need for additional film formation processes and reducing manufacturing complexity
Solution Approach 2:
The patent extracts the resistance function from a separate component (oxide film) and integrates it into the main ferrite material. This extraction and integration approach simplifies the overall structure and manufacturing process while maintaining the desired frequency-dependent resistance characteristics
3Loss of energy
If a separate oxide film is disposed on the inductor surface, then resistance function is added, but element size increases
Solution Approach 1:
The patent combines the resistance function with the ferrite material body, eliminating the need for separate oxide film layers. This integration achieves the desired resistance characteristics without adding extra volume, thus preventing element size increase
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 solution provides a resistance element with improved frequency characteristics, reducing signal deformation and phase delay, while simplifying the manufacturing process and enabling size reduction by integrating the coil within the ferrite material assembly.
Implementation Method 1
the resistance component Ra corresponding to the real part has a large value, and a noise component is efficiently absorbed in a specific high-frequency domain including the noise component
Implementation Method 2
an element having an impedance in which the resistance component corresponding to the real part took on a specific value or less in a frequency domain of a signal to be passed and took on a sufficiently large value in the domain of higher frequencies
Data Source
AI summary
A frequency-dependent resistance element includes an element assembly composed of a sintered magnetic material and a coil conductor embedded in the element assembly. The sintered magnetic material is composed of a primary component containing Fe, Zn, Ni, and Cu and a secondary component containing Co. In the primary component, on a percent by mole basis, the Fe content is 46.79 to 47.69, the Zn content is 12.60 to 24.84, and the Ni content is 19.21 to 32.36 in terms of Fe2O3, ZnO, and NiO, respectively. The molar ratio (Ni:Zn) of Ni to Zn is (1−X):X, where X is from about 0.28 to about 0.56. The content of Co in terms of Co3O4 is 1.0 to 10.0 parts by mass relative to 100 parts by mass of the primary component containing Fe, Zn, Ni, and Cu in terms of Fe2O3, ZnO, NiO, and CuO, respectively.