Output Terminal Capacitor Layout for Shielded Noise Suppression
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Solution Overview
Problem
Noise generated inside an electronic device's shielding member can still be transmitted to external devices via the output line, despite the presence of a filter capacitor, as existing solutions do not effectively prevent radiation noise from exiting the case.
Innovation Solution
A filter capacitor is positioned outside the shielding member and connected to the output line, with the shielding member, such as a case, reducing external noise influence and the capacitor integrated into the output terminal base to shorten the distance and shield the perimeter, thereby preventing noise transmission to external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a filter capacitor is provided inside a case, then the device structure is simplified, but noise generated inside the case is transmitted to external devices via output lines
Solution Approach 1:
The filter capacitor is extracted from the interior of the case and relocated to the exterior surface. This separation removes the capacitor from the noise-generating environment inside the case, preventing it from acting as an antenna that radiates noise through output lines, while still maintaining its noise filtering function.
Solution Approach 2:
The case surface serves as an intermediary mounting location between the internal noise-generating circuits and the external filter capacitor. This intermediate position allows the capacitor to effectively filter noise on output lines without being directly exposed to internal noise radiation, bridging the gap between internal circuitry and external filtering requirements.
2Object-generated harmful factors
If the filter capacitor is arranged outside the shielding member, then noise transmission is prevented, but the distance between components increases
Solution Approach 1:
The filter capacitor is positioned on the external surface of the case, utilizing the third dimension (depth/height) rather than increasing horizontal distance. This vertical/external placement allows the capacitor to be close to the output line connection point while maintaining effective noise filtering, reducing the need for long trace lengths without requiring the capacitor to be inside the case.
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 effectively prevents noise generated inside the shielding member from being transmitted to external devices, reducing external noise influence while maintaining a compact device size and structure.
Implementation Method 1
a filter capacitor that is arranged outside the shielding member to be connected to the output line... the noise is removed by the filter capacitor arranged outside the shielding member
Implementation Method 2
a shielding member, an electric circuit that has an output line and is arranged inside the shielding member... the filter capacitor shielding member shields the perimeter of the filter capacitor
Data Source
AI summary
An electronic device includes a shielding member, an electric circuit, and a filter capacitor. The electric circuit has an output line and is arranged inside the shielding member. The filter capacitor is arranged outside the shielding member to be connected to the output line.