Superposed Signal Sampling Apparatus for HART DC Extraction
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Solution Overview
Problem
Traditional methods for extracting a direct current signal from a superposed signal in HART communication protocols face challenges in precision and cost, as they often require dedicated hardware or result in low precision when using existing hardware.
Innovation Solution
A superposed signal sampling apparatus and method that uses a signal receiving module, an extracting module to determine if the signal is within a preset threshold range, and an output module to integrate and output the direct current signal, allowing for adjustable precision without additional hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated data processing hardware is used to extract the direct current signal from the superposed signal, then measurement precision of the direct current signal is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the necessary DC signal component from the superposed AC+DC signal by identifying and removing the AC components through threshold-based detection, rather than using complex dedicated hardware to process the entire signal. This extraction approach achieves precise DC signal isolation with simpler processing logic.
Solution Approach 2:
The patent uses software-based signal processing that replicates the functionality of dedicated hardware through programmed algorithms. By copying the essential extraction logic into software form that runs on existing hardware platforms, it achieves hardware-level precision without the cost and complexity of physical dedicated hardware devices.
2Device complexity
If existing hardware is programmed to extract the direct current signal without dedicated hardware, then device complexity is reduced, but measurement precision of the extracted direct current signal deteriorates
Solution Approach 1:
The patent implements dynamic threshold adjustment mechanisms that adapt to varying signal conditions. The threshold range for AC signal detection is not fixed but can be adjusted based on signal characteristics, allowing the software-based system to maintain high precision across different operating conditions while keeping the hardware platform simple and reusable.
Solution Approach 2:
The patent changes key processing parameters such as threshold values, detection ranges, and sampling rates to optimize extraction precision for different signal scenarios. By dynamically adjusting these parameters rather than using fixed hardware characteristics, the system achieves high precision with flexible software-based processing on existing hardware.
3Ease of operation
If a fixed threshold method is used to determine direct current signal extraction, then ease of operation is improved, but adaptability to different signal conditions deteriorates
Solution Approach 1:
The patent transforms the static threshold into a dynamic parameter that adapts to different signal conditions. The system automatically adjusts threshold values based on detected signal characteristics, maintaining ease of operation through automated adaptation while achieving versatility across varying AC frequencies, amplitudes, and DC signal levels without manual reconfiguration.
Data Source
AI summary
The present disclosure relates to a superposed signal sampling apparatus, including: a signal receiving module, a signal extracting module, and a signal output module. The signal receiving module is used to receive a superposed signal. The signal extracting module is used to determine whether the received superposed signal is within a preset threshold range of a direct current signal; if the received superposed signal is within the threshold range, extract a previously received signal as a direct current signal to be output; and if the received superposed signal is beyond the threshold range, extract a currently received signal as a direct current signal to be output. The signal output module is used to integrate the direct current signal extracted by the signal extracting module, and then output the direct current signal. The present disclosure further relates to a superposed signal sampling method.