Variable Filter for Noise Measurement in Power Stabilization Networks
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Solution Overview
Problem
Power line communication systems face challenges in measuring noise effectively due to harmonic noises and variable impedances, which can interfere with EMI measurers and distort measurement results, especially in the forbidden frequency band.
Innovation Solution
A noise measurement system incorporating a variable filter that attenuates specific frequencies, allowing power line communication signals to operate within an EMI measurer's input scope while maintaining signals in the forbidden frequency band without attenuation, using a high pass or variable filter connected to the power stabilization network and EMI measurer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter attenuates all frequencies below a certain threshold to reduce noise, then noise floor interference is reduced, but signals in the forbidden frequency band are also attenuated causing measurement distortion
Solution Approach 1:
The filter applies different attenuation characteristics to different frequency regions. Specifically, it provides strong attenuation for frequencies below 525 kHz to reduce noise floor, while providing no attenuation (0 dB) for frequencies in the forbidden band (525-862.5 kHz) to preserve measurement accuracy. This frequency-selective local quality approach resolves the contradiction by treating different frequency ranges differently according to their specific requirements.
2Measurement precision
If a high pass filter is used to attenuate low frequency noise, then noise measurement accuracy is improved, but signals in the forbidden frequency band may be affected
Solution Approach 1:
The filter employs dynamic switching between different filter configurations based on the measurement requirements. A control unit switches between a high pass filter mode (for general noise measurement) and a variable filter mode (for measurements involving forbidden frequency bands). This dynamic adaptation allows the system to optimize performance for different measurement scenarios, improving noise measurement accuracy while preventing signal distortion in the forbidden band when needed.
3Measurement precision
If a variable filter is used to preserve forbidden frequency band signals, then measurement accuracy is maintained, but device complexity increases
Solution Approach 1:
The filter system is designed with multi-functionality to reduce overall complexity. The same filter hardware can operate in multiple modes: as a high pass filter for general noise measurement and as a variable filter with adjustable cutoff frequencies for forbidden band measurements. The control unit intelligently selects the appropriate mode based on measurement requirements. This universal design allows one component to serve multiple purposes, avoiding the need for separate dedicated filters for each function and thereby reducing device complexity.
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 system effectively reduces noise floor interference in the forbidden frequency band, ensuring accurate noise measurement by attenuating frequencies below 525 kHz without affecting signals in the forbidden band, thus preventing equipment damage and distortion.
Implementation Method 1
A noise measurement system incorporating a variable filter that attenuates specific frequencies, allowing power line communication signals to operate within an EMI measurer's input scope while maintaining signals in the forbidden frequency band without attenuation
Data Source
AI summary
A noise measurement system in a power stabilization network, a variable filter applied to the power stabilization network, and a method for measuring noise in the power stabilization network are provided. A power line communication signal from the power stabilization network is attenuated relative to a particular frequency using a filter in order to allow the power line communication signal to operate within an input range of an Electromagnetic Interference (EMI) measurer. A signal from a forbidden frequency band is transmitted to the EMI measurer without any attenuation or influence on a noise floor.