Rotary Data Transmission Clock Modulation for EMC
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Solution Overview
Problem
Existing data transmission systems in rotating parts, such as computer tomographs, face challenges in reducing electromagnetic interference (EMC) emissions due to high-frequency signal radiation, especially when transmitting data at high bandwidths through long conductor systems that cannot be screened.
Innovation Solution
A rotary data transmission system that incorporates a clock modulator to broaden the frequency spectrum of the data clock, creating additional spectral spikes near the original spikes, thereby reducing the amplitude of individual spectral spikes and improving signal quality and EMC compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency signals are transmitted through long conductor systems in rotating parts, then data transmission bandwidth is achieved, but electromagnetic interference emissions increase
Solution Approach 1:
The patent applies parameter changes by modifying the frequency spectrum characteristics of the transmitted signal. Specifically, it transforms the signal from having concentrated spectral spikes to having distributed spectral components through frequency modulation or spreading techniques. This changes the frequency domain parameters to reduce peak emissions while maintaining data transmission bandwidth, thereby resolving the contradiction between productivity and electromagnetic interference emissions.
2Productivity
If signal power is concentrated at specific frequencies, then transmission efficiency is improved, but EMC compliance becomes difficult to achieve
Solution Approach 1:
The patent applies segmentation by dividing the concentrated signal power into multiple spectral components. Instead of transmitting at a single frequency or with narrow spectral spikes, the signal is segmented across multiple frequency channels or spread spectrum components. This segmentation reduces the amplitude of individual spectral spikes while maintaining overall transmission efficiency through the combined power of all spectral components.
3Reliability
If conductor systems are made longer to transmit data over rotation gaps, then connectivity is maintained, but radiation of high-frequency interference increases
Solution Approach 1:
The patent applies parameter changes by transforming the temporal signal characteristics into frequency-domain characteristics that reduce radiation. By using frequency spreading or modulation techniques, the long conductor system's inherent radiation problem is mitigated by changing the signal's frequency parameters, thereby maintaining connectivity while reducing high-frequency interference radiation.
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 solution effectively reduces EMC emissions by distributing the signal power across multiple spectral spikes, achieving better EMC values and improved signal quality, with laboratory measurements showing a reduction in spike amplitudes by 6 dB, facilitating compliance with EMC standards.
Implementation Method 1
at least one of the data source, driver, receiving unit, and data sink comprises a clock modulator for broadening a frequency spectrum of a data clock, so that further spectral spikes occur in close proximity of individual spectral spikes of an unmodulated data clock
Data Source
AI summary
A non-contacting data path for rotating data transmission of digital data from a data source to a data sink includes at least one clock modulator. A data clock frequency is specifically modulated with the clock modulator to widen a spectrum of data signals and achieve improved EMC properties in measurements according to valid EMC Standards. Owing to use of a plurality of clock modulators along a course of a non-contacting rotary transmission path, signal jitter caused by individual components of the data transmission path is in each case replaced by artificially caused jitter of clock modulation. Thus, data transmission with defined jitter and defined signal quality can be achieved.