Delta-Sigma Current Signal Processing for Precise Loop Synchronization
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Solution Overview
Problem
Existing methods for processing analog signals from converters face challenges in synchronizing secondary control loops with high time resolution, as they require coarse time quantization due to the limitations of delta-sigma modulators and decimation filters, which restricts the quality of synchronization control in industrial applications.
Innovation Solution
A method involving a delta-sigma modulator that converts analog signals into a one-bit data stream, which is then processed by digital filters with serially disposed integrators, allowing for high time resolution in measuring duration specification and enabling precise analog-to-digital conversion without the need for differentiators or reset devices, facilitating galvanic isolation and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a delta-sigma modulator with decimation filter is used for analog-to-digital conversion, then analog signals can be converted to digital form, but the time quantization becomes coarse which limits synchronization quality
Solution Approach 1:
The patent extracts and eliminates the differentiator and reset device from the traditional delta-sigma modulator structure. By removing these components, the system achieves high time resolution measurement without the complexity and limitations of the conventional filter structure, directly resolving the contradiction between measurement precision and device complexity.
2Adaptability or versatility
If the measuring duration is adjusted with long time duration TD for synchronization, then synchronization with field bus systems becomes possible, but the time resolution for measuring interval specification deteriorates
Solution Approach 1:
The patent segments the measuring interval into individually addressable time slots with resolution TS. This segmentation allows the system to achieve both synchronization capability (by selecting appropriate interval lengths) and high measuring interval resolution (by addressing individual time slots), resolving the contradiction between adaptability and measurement precision.
3Adaptability or versatility
If multiple control loops are synchronized via field bus system, then spatially distributed control becomes possible, but the synchronization quality is limited by rough time quantization
Solution Approach 1:
The patent replaces the mechanical/time-quantized synchronization mechanism with a digitally addressed time-slot selection mechanism. By using digital addressing of time slots with resolution TS instead of relying on coarse time duration TD, the system achieves high synchronization precision while maintaining distributed control capability across multiple control loops.
Data Source
AI summary
A method for processing a measured-value signal representing a value, determined in analog form, for the output current of a converter, and device for carrying out the method, the measured-value signals acquired by a sensor, especially including a shunt resistor, being supplied to a respective processing channel that has at least one delta-sigma modulator.