Alternating-Polarity Signal Transmission for Long Elevator Cables
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Solution Overview
Problem
Existing elevator systems face challenges in ensuring reliable signal transmission due to the need for accurate and consistent communication of safety signals between the remote unit and the master unit, particularly in ensuring the reliability of signal transmission over longer distances.
Innovation Solution
A transmission system that alternately outputs pulse voltage with positive and negative polarity by using first and second switching elements to open and close alternately, allowing the master unit to separate and process these signals effectively, ensuring reliable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-polarity signal transmission is used, then cable cost is reduced, but signal transmission reliability deteriorates over long distances
Solution Approach 1:
The signal transmission system is segmented into distinct functional units: a remote unit that generates and transmits signals, and a master unit that receives and processes signals. The signal itself is segmented into alternating positive and negative polarity pulses, allowing the master unit to separate and process each polarity independently through dedicated signal separation circuits. This segmentation improves reliability by isolating signal paths and reducing interference over long cable distances.
2Reliability
If alternating positive and negative polarity pulse signals are used, then signal transmission reliability is improved, but device complexity increases
Solution Approach 1:
The system utilizes parameter changes in signal polarity (positive to negative alternation) to encode information and improve transmission reliability. By varying the polarity parameter of the pulse signals and using switching elements to alternate between positive and negative states, the system achieves more reliable signal differentiation and noise immunity without requiring fundamentally new hardware architectures.
3Adaptability or versatility
If longer cable distances are used, then installation flexibility is improved, but signal transmission reliability deteriorates
Solution Approach 1:
The remote unit generates periodic alternating polarity pulse signals that are transmitted through the cable to the master unit. This periodic action with alternating polarities creates distinct signal patterns that can be reliably detected and separated even over long cable distances, maintaining signal integrity and transmission reliability despite increased installation flexibility and cable length.
Data Source
AI summary
To provide a transmission system capable of ensuring reliability of signal transmission. The transmission system includes: a remote unit alternately outputting pulse voltage with a positive polarity and pulse voltage with a negative polarity as a signal by causing a first switching element and a second switching element to alternately open and close; and a master unit accepting input of a signal from the remote unit via a cable, and separating the signal into a first signal corresponding to the pulse voltage with the positive polarity and a second signal corresponding to the pulse voltage with the negative polarity.