Laminated Capacitor Integrating Coil and Electrode for ECU Miniaturization
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Solution Overview
Problem
Conventional electronic control units face challenges in miniaturization due to increased mounting area requirements for low-pass filter components, particularly when incorporating multiple capacitors and inductance elements, which complicates ground stability and noise suppression.
Innovation Solution
A laminated capacitor design is implemented, featuring a spiral coil pattern that serves as both a coil and capacitor electrode, connected in series and parallel to reduce component size and increase density, allowing for high-density mounting of inductance elements and capacitors necessary for low-pass filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If four patterns of layers are prepared to form coil loop for low-pass filter, then noise suppression capability is improved, but mounting area increases
Solution Approach 1:
The invention merges the coil pattern and capacitor pattern into a single laminated capacitor component. The coil pattern is formed by laminating multiple circuit patterns with via holes to create coil loops, while the capacitor is formed by laminating dielectric sheets with electrode patterns. Both the inductance element (coil) and capacitance element (capacitor) are integrated into one component, eliminating the need for separate mounting of multiple components and reducing the overall mounting area while maintaining noise suppression capability.
Solution Approach 2:
The laminated capacitor serves multiple functions simultaneously: it provides capacitance for filtering, inductance through the coil pattern for low-pass filtering, and acts as a single mounting component. The circuit patterns and via holes create coil loops that generate inductance, while the dielectric sheets and electrodes provide capacitance, making the component universal for low-pass filter applications.
2Reliability
If capacitor and inductance element are formed in different patterns, then electrical function is improved, but mounting area increases
Solution Approach 1:
The invention combines the capacitor formation (through dielectric sheets and electrodes) and inductance element formation (through coil patterns with via holes) into a single integrated component. The coil pattern and capacitor pattern share the same laminated structure, allowing both electrical functions to coexist in one component with reduced mounting footprint.
3Volume of stationary object
If electronic circuit is miniaturized, then electronic control unit size is reduced, but ground stability deteriorates
Solution Approach 1:
By integrating the low-pass filter functionality into a single laminated capacitor component, the invention reduces the overall number of discrete components and interconnections required. This miniaturization is achieved while maintaining ground stability because the filter function is built into the component itself, reducing the complexity of ground connections and the density of plated circuits that would otherwise be required.
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 design enables the miniaturization of electronic control units by integrating coil and capacitor patterns within a single component, effectively addressing the issue of increased mounting area and enhancing noise suppression capabilities.
Implementation Method 1
a plurality of spiral coil effect generation patterns that are laminated
Implementation Method 2
a laminated capacitor incorporating a circuit pattern and a dielectric body
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The purpose of the present invention is to provide a component in which inductors and capacitors necessary for a low-pass filter and the like can be mounted at high density, and to in turn reduce the size of an electronic control unit in which the component is installed. The electronic control unit is characterized in that: the electronic control unit is provided with a laminated capacitor having built-in circuit patterns and dielectric bodies; the circuit patterns comprise a laminated plurality of coil effect generation patterns and inter-layer connection patterns for series connection of the plurality of coil effect generation patterns; and at least some of the plurality of coil effect generation patterns are used as electrodes for the laminated capacitor.