Multi-Band Harmonic Extraction Circuit for Equipment Aging
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Solution Overview
Problem
Conventional health information extraction circuits struggle to accurately extract small harmonic amplitude changes caused by equipment aging due to high-amplitude operating signals, and they typically monitor only a single frequency band, leading to high investment costs and limited coverage, thus reducing the effectiveness of prognostic health management (PHM) technology.
Innovation Solution
A harmonic information extraction circuit comprising a sampling module, amplitude regulation module, and envelope extraction module that suppresses non-target band signals and adjusts target band signal amplitudes to a preset ratio, enabling extraction of harmonic signals from multiple frequency bands, facilitating comprehensive health status evaluation of electronic equipment components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sampling systems are used to acquire operating signals, then the system can operate continuously without downtime, but the small harmonic amplitude changes caused by equipment aging are hidden within high-amplitude operating signals and cannot be accurately extracted
Solution Approach 1:
The patent segments the operating signal into multiple frequency bands using band-pass filters, separating the target harmonic signals from the high-amplitude operating signals. This allows independent processing and amplification of specific frequency components without interference from other frequency components.
Solution Approach 2:
The patent introduces an intermediary amplification stage that selectively amplifies only the target frequency band signals after they have been separated by band-pass filters. This intermediary processing enables the small harmonic changes to be extracted and amplified without being overwhelmed by the high-amplitude operating signals.
2Adaptability or versatility
If conventional extraction circuits monitor only a single frequency band, then the circuit complexity is low, but the investment cost increases and the coverage of monitored components is limited
Solution Approach 1:
The patent designs a multi-functionality extraction circuit that can simultaneously monitor multiple frequency bands and multiple component types. The circuit uses parallel band-pass filter channels, each capable of monitoring different frequency bands, making the system universally applicable to various component types without requiring separate dedicated circuits for each.
Solution Approach 2:
The patent extends the monitoring capability from a single frequency dimension to multiple frequency dimensions by introducing parallel band-pass filter channels. This dimensional expansion allows the system to monitor multiple frequency bands simultaneously, increasing component coverage without proportionally increasing circuit complexity.
3Measurement precision
If the amplitude of target band signals is not regulated, then the circuit operation is simple, but the extracted harmonic information cannot be accurately compared across different frequency bands
Solution Approach 1:
The patent implements feedback control in the amplitude regulation stage, where the output signal is monitored and fed back to adjust the amplification factor of each frequency band. This ensures that the amplitudes of target band signals from different frequency bands are regulated to a consistent level, enabling accurate comparison while maintaining circuit operation simplicity through automated control.
Data Source
AI summary
A harmonic information extraction circuit is provided. The harmonic information extraction circuit includes a sampling module, an amplitude regulation module and an envelope extraction module. The sampling module is electrically connected to signal terminals of an electronic equipment to acquire a first sampling signal, and generates a first output signal. The first sampling signal includes first and second target band signals and a non-target band signal. The amplitude regulation module receives the first output signal, adjust at least one of an amplitude of the first target band signal and an amplitude of the second target band signal for ensuring that a ratio of the amplitude of the first target band signal to the amplitude of the second target band signal falls within a preset range, and generates a second output signal. The envelope extraction module receives the second output signal and extracts an envelope of the second output signal.