Three-Phase Power-Line Data Transmission Without Extra Cabling
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Solution Overview
Problem
Existing systems require additional cabling for information transmission beyond basic switching operations in drives powered by three-phase lines, which is costly and complex.
Innovation Solution
Utilize existing three-phase power lines to transmit information by measuring and processing supply voltages, employing low-frequency signals below 100 Hz, using resistive series circuits, half-wave control, and curve evaluation to encode and decode data without additional cabling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional fieldbus cabling is provided for information transmission, then information transmission capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling the three-phase power lines to serve dual purposes: both power transmission and information transmission. The control unit modulates supply voltages on the power lines to encode information, allowing the same infrastructure to perform both energy supply and data communication functions, thereby eliminating the need for separate fieldbus cabling.
Solution Approach 2:
The patent merges the power transmission function and information transmission function into a single system. By superimposing low-frequency information signals onto the power line voltages, the invention combines what were previously separate functions (power delivery and data communication) into one integrated infrastructure, reducing overall system complexity.
2Speed
If high-frequency modulation is used for information transmission, then transmission speed is improved, but reliability and transmission range deteriorate
Solution Approach 1:
The patent changes the frequency parameter of the information transmission signals from high-frequency modulation to low-frequency signals (below 100 Hz). This parameter change prioritizes reliability and transmission range over raw transmission speed. The control unit encodes information using low-frequency variations in supply voltages, which are more resistant to interference and can travel longer distances through the power line infrastructure.
3Adaptability or versatility
If expensive high-frequency signal electronics are used, then information transmission capability is improved, but cost increases
Solution Approach 1:
The patent applies self-service by utilizing the existing power line voltages themselves as the transmission medium. Instead of requiring separate expensive high-frequency signal electronics and coupling elements, the invention uses the supply voltages from the power lines directly for information transmission. The control unit modulates the existing voltage levels, eliminating the need for additional specialized signal conditioning equipment.
Solution Approach 2:
The patent employs inexpensive resistive series circuits and simple voltage measurement techniques instead of costly high-frequency signal electronics. The evaluation unit can be implemented using basic comparators and analog-to-digital converters that process the modulated voltages, significantly reducing component costs while maintaining information transmission capability.
Data Source
AI summary
In a system and method for operating a system, a drive is connectable to a supply-voltage source, especially an AC-voltage source, with the aid of an apparatus, in particular a control unit, via electric lines installed in the system, and information is transmittable between the control unit and the drive, using the lines.