Low-Voltage Network Data Transmission Phase Selection
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Solution Overview
Problem
Data transmission in low-voltage networks is often disrupted by interference pulses from loads with non-linear current-voltage characteristics, leading to packet loss and reduced transmission quality, as existing methods like AC phase detection do not account for interference or connection quality during data transmission.
Innovation Solution
A method where the master unit sends request messages via all phase conductors to client units to assess connection quality, selects the phase with the best quality for data transmission, and uses a switching component to ensure communication occurs on the optimal phase, thereby reducing interference and improving transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is performed via all phase conductors in a low-voltage network, then the data transmission rate and reliability can be improved, but interference pulses from loads with non-linear current-voltage characteristics cause packet loss and reduced transmission quality
Solution Approach 1:
The patent segments the data transmission path by evaluating each phase conductor separately and selecting only the optimal phase for transmission. Instead of using all phase conductors simultaneously, the system divides the transmission task into phase-specific evaluations and chooses the best segment (phase) for actual data transmission, thereby avoiding interference from other phases.
Solution Approach 2:
The patent implements dynamic phase selection by continuously monitoring connection quality parameters (such as signal-to-noise ratio, packet loss rate) for each phase conductor and adapting the transmission path in real-time. The master unit dynamically determines which phase conductor to use based on current network conditions, making the system flexible and responsive to changing interference patterns.
2Measurement precision
If the master unit queries connection quality from all client units via all phase conductors, then the optimal phase for data transmission can be identified, but the communication complexity and time required for phase detection increase
Solution Approach 1:
The patent performs preliminary connection quality assessment by having the master unit query each client unit about their available phase conductors and connection qualities before actual data transmission begins. This preliminary evaluation establishes a mapping between client units and their optimal phases, so that during normal operation, the system can directly use pre-determined optimal paths without repeated complex evaluations.
Solution Approach 2:
The system implements feedback mechanisms where client units report their connection quality metrics (signal strength, interference levels, packet loss) back to the master unit. The master unit uses this feedback information to make informed decisions about phase selection, continuously optimizing the transmission path based on actual network conditions while avoiding unnecessary complexity through targeted rather than exhaustive querying.
3Loss of information
If AC phase detection method is used to identify client unit phases, then phase identification can be achieved, but the method does not account for interference or connection quality during data transmission
Solution Approach 1:
The patent extends the basic AC phase detection method by incorporating additional quality parameters into the phase selection process. Instead of relying solely on phase identification, the system evaluates multiple parameters including signal-to-noise ratio, packet loss rate, interference levels, and connection stability for each phase conductor. This multi-parameter approach transforms the simple phase detection into a comprehensive quality assessment mechanism.
Solution Approach 2:
The patent introduces an intermediary evaluation layer between phase detection and data transmission. The master unit acts as an intermediary that collects connection quality information from client units, evaluates the suitability of each phase conductor considering interference patterns, and mediates the selection of the optimal transmission path. This intermediary assessment ensures that phase identification is complemented by quality verification before actual transmission occurs.
Data Source
Figure 1~2
AI summary
The invention relates to a method for data transmission in a low-voltage network (SN) with multiple electrical phase conductors (L1, L2, L3). In this method, the phase conductors (L1, L2, L3) of the low-voltage network (SN) are used, in addition to supplying power, for the transmission of data, messages, or signals between a master unit (ME) and client units (CE), whereby the master unit (ME) can send and receive messages and data via all phase conductors (L1, L2, L3) of the low-voltage network (SN). The method comprises the following steps: a) Sending a request message via a phase conductor (L1, L2, L3), with which the master unit (ME) directly requests client units (CE) to transmit a response message containing a value for connection quality (102);b) Storing at least the connection quality value for each client unit (CE) after receiving the response message from that client unit (CE, 102); c) Performing steps a) and b) until the master unit (ME) has sent the request message over each phase conductor (L1, L2, L3) of the low-voltage network (SN) (103); d) Comparing the stored connection quality values for each client unit (CE) (104); and e) Selecting the phase conductor (L1, L2, L3) for data transmission with the client unit (CE, 105) for which the stored connection quality value is lowest.