Galvanic Isolation for M-Bus Consumption Value Recording Units
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Solution Overview
Problem
Consumption value recording units connected to an M-Bus face high energy consumption due to monitoring the entire communication traffic, leading to reduced battery life and potential communication failures, especially under high loads from frequent sensor queries.
Innovation Solution
A communication unit, preferably an integrated circuit or microcomputer, monitors and filters M-Bus communication, forwarding only relevant data to the consumption value recording unit, allowing galvanic isolation and reducing energy requirements, thus enabling efficient communication without burdening the unit's battery supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the consumption value recording unit monitors the entire M-Bus communication traffic, then it can recognize addressing and selection correctly, but the energy consumption increases significantly reducing battery life
Solution Approach 1:
The monitoring function is extracted from the consumption value recording unit and assigned to a dedicated communication unit. This allows the consumption value recording unit to stop monitoring the entire M-Bus traffic, significantly reducing its energy consumption while the communication unit handles the monitoring task using energy from the M-Bus power supply.
Solution Approach 2:
A communication unit is introduced as an intermediary between the M-Bus and the consumption value recording unit. This intermediary monitors the M-Bus communication traffic, filters relevant data, and forwards it to the consumption value recording unit, thereby protecting the latter from high energy consumption while ensuring reliable communication.
2Ease of operation
If communication credits are allocated to the consumption value recording unit, then communication is possible, but frequent sensor queries by other units deplete credits before consumption value collection
Solution Approach 1:
The communication functions are segmented into different units with different energy sources. The communication unit, powered by the M-Bus supply, handles monitoring and filtering without consuming credits from the consumption value recording unit's battery. This separation ensures that consumption value collection is not affected by other units' communication activities.
3Duration of action of moving object
If a generous energy reserve or larger battery is used, then communication availability is ensured, but device size and cost increase
Solution Approach 1:
The monitoring function is extracted from the consumption value recording unit and assigned to a dedicated communication unit. This allows the consumption value recording unit to stop monitoring the entire M-Bus traffic, significantly reducing its energy consumption while the communication unit handles the monitoring task using energy from the M-Bus power supply.
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
This approach reduces energy consumption and extends battery life, allowing for reliable communication between the consumption value recording unit and the M-Bus, enabling smaller, more cost-effective, and space-saving designs while ensuring uninterrupted data exchange.
Implementation Method 1
The consumption value recording units are connected to the M-bus by means of optocouplers, so that optical data transmission from the M-bus to the consumption value recording units and from the consumption value recording units to the M-bus is made possible.
Data Source
Figure 1
AI summary
The device (1) has a consumption value detection unit (2) e.g. water meter, gas meter, heat meter and current meter, and units e.g. data detection units and control units, connected with a central unit (4) by a meter bus data interface (M-bus) (3). The detection unit is connected with the M-bus by a communication unit (5), data transmission line (8), data receiving line (9) and energy supply line (7). The communication unit monitors communication of the M-bus and forwards to the detection unit, where the detection unit is galvanically separated (6) from the communication unit. An independent claim is also included for a method for communicating a consumption value reading device.