ADC Sampling Point Placement for Multi-Frequency Interference
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Solution Overview
Problem
Existing methods for analog-to-digital conversion in motor vehicle traction networks result in high measuring errors due to interference signals with different frequencies superimposed on the input signal, particularly when using equidistant sampling points.
Innovation Solution
Determine sampling points as a function of the frequencies of both low-frequency and high-frequency interference signals, optimizing their placement within the measuring cycle to detect minima and maxima, thereby reducing measuring errors without increasing the total number of sampling points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If equidistant sampling points are used in the measuring cycle, then the sampling process is simple and regular, but high measuring errors occur due to interference signals
Solution Approach 1:
The patent changes the sampling parameters from fixed equidistant intervals to variable intervals determined by the interference signal frequencies. The sampling points are positioned at specific phases of the interference signals (minima and maxima) to optimize measurement accuracy while maintaining a limited number of sampling points per measuring cycle.
2Measurement precision
If the number of sampling points is increased to reduce measuring errors, then measurement precision improves, but the complexity and cost of the conversion device increases
Solution Approach 1:
Instead of increasing the number of sampling points, the patent optimizes the positioning of existing sampling points by determining their locations as a function of interference signal frequencies. This approach maintains the same hardware complexity while achieving reduced measuring errors through intelligent sampling point distribution.
Solution Approach 2:
The patent performs preliminary determination of interference signal frequencies and uses this information to pre-calculate optimal sampling point positions before actual sampling occurs. This preliminary action enables the system to achieve high measurement precision with a limited number of sampling points by strategically positioning them at critical phases of the interference signals.
3Measurement precision
If sampling points are determined as a function of interference signal frequencies, then measuring error is reduced, but the complexity of determining sampling points increases
Solution Approach 1:
The patent performs frequency determination of interference signals in advance and uses these pre-determined frequencies to calculate optimal sampling point positions. This preliminary determination simplifies the overall process by separating frequency analysis from sampling execution, allowing the sampling points to be strategically positioned at minima and maxima of interference signals without requiring complex real-time adjustments.
Data Source
AI summary
The invention relates to a method for analog-to-digital conversion of an analog input signal, which is at least essentially continuous and which has a useful signal that is superimposed with at least two interference signals having different frequencies, into a digital output signal, wherein the input signal is sampled in a limited measuring cycle, and wherein the number and points in time of multiple sampling points within the measuring cycle are determined as a function of a frequency of the input signal. It is provided that the sampling points (are determined as a function of the frequencies of the interference signals.