Noise Conduction Path Discrimination Using Segmented Detection Channels
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Solution Overview
Problem
Existing power-source noise detector circuits cannot distinguish between paths through which noises are conducted and those through which noises are not conducted, nor can they quantify the noise conduction, making it difficult for users to determine likely noise paths.
Innovation Solution
A test system and method that includes amplifier circuits, isolators, noise detectors, and counter circuits to differentiate between static electrical charges and test noises, allowing users to identify paths through which noises are likely to be conducted and those through which they are not, by using a combination of amplifiers, isolators, noise detectors, and counter circuits to analyze signal outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light emitting diode is used to indicate noise conduction, then noise detection is achieved, but the ability to distinguish different noise paths and quantify noise conduction is lost
Solution Approach 1:
The patent divides the noise detection system into multiple independent detection channels, each corresponding to a specific power source or noise path. Instead of a single light emitting diode that cannot distinguish paths, multiple light emitting diodes are provided, with each diode indicating noise conduction in a specific path. This segmentation allows simultaneous monitoring of multiple noise paths while maintaining the simplicity of visual indication.
Solution Approach 2:
The patent introduces counter circuits as intermediary devices between the noise detector and the light emitting diode. The counter circuits quantify the number of times noise is conducted through each path and use this quantification to control the brightness or blinking pattern of the light emitting diode. This intermediary layer preserves the visual indication capability while adding path identification and quantification information.
2Device complexity
If a simple light emitting diode indicator is used, then the device complexity is reduced, but the measurement precision of noise conduction is insufficient
Solution Approach 1:
The patent makes the light emitting diode indication dynamic by controlling its brightness intensity or blinking frequency based on the quantification data from the counter circuits. Instead of a static on/off indication, the diode's visual output varies dynamically to represent different levels of noise conduction frequency or intensity, thereby providing precise measurement information without requiring complex additional display devices.
3Loss of information
If multiple detection channels are added to identify different noise paths, then path identification capability is improved, but the device complexity increases
Solution Approach 1:
The patent designs each detection channel to be functionally identical and interchangeable, with each channel comprising a noise detector and counter circuit that can process any type of noise signal. This universal design allows the system to monitor multiple noise paths using the same circuit architecture, reducing overall complexity compared to having specialized circuits for each path. The light emitting diodes also serve multiple functions: indicating presence of noise, showing noise frequency through blinking, and representing different paths through spatial arrangement.
Data Source
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AI summary
When static electrical charges by electromagnetic waves are applied to a test-target board (10) or test noises are applied to the ground of the test-target board (10), a test device (20_1) tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit (K1) to the ground of the test-target board (10), and a test device (20_2) tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit (K2) to the ground of the test-target board (10) together with the number of conductions.