Safety Module Field-Bus Power Supply Continuity
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Solution Overview
Problem
Existing safety modules for protecting electrical consumers against excessive current require additional components like power storage, increasing installation complexity and effort, and may not ensure continuous operation during supply voltage failures or field-bus disruptions.
Innovation Solution
A safety module for field-bus systems that includes a switch-on unit, control unit, and supply module, allowing for the generation of operating power from either supply power or field-bus power, ensuring continuous operation and secure supply power relay even when the supply power is outside predetermined ranges, with galvanic isolation to prevent interference between power and communication lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power storage component is added to ensure continuous operation during supply voltage failures, then the reliability is improved, but the device complexity and installation effort increase
Solution Approach 1:
The patent combines the power storage function with the existing field-bus power supply lines by using the field-bus power to charge an integrated capacitor. This merging eliminates the need for separate power storage components and their associated wiring, thereby improving reliability through continuous operation capability while avoiding increased device complexity and installation effort
Solution Approach 2:
The field-bus power supply line is given multiple functions: it not only provides power for communication but also charges the power storage component to ensure continuous operation during supply voltage failures. This multi-functionality approach improves reliability without adding dedicated components, thus avoiding increased complexity
2Reliability
If additional wiring is used to connect power storage components, then the reliability is improved, but the ease of operation and installation are worsened
Solution Approach 1:
The patent merges the power storage function into the existing field-bus communication infrastructure by using the same power supply lines for both communication and power storage charging. This eliminates additional wiring requirements while ensuring continuous operation, thereby improving reliability without compromising ease of installation
Solution Approach 2:
The system uses its own field-bus power supply to automatically charge the integrated power storage component, eliminating the need for external power storage components and their associated installation efforts. This self-service approach improves reliability through continuous operation capability while maintaining ease of installation
3Device complexity
If power and communication lines are shared, then the device complexity is reduced, but interference between power and communication lines may occur
Solution Approach 1:
The patent introduces an intermediary capacitor that is charged by the field-bus power supply line and then provides power to the safety module's operating power supply. This intermediary energy storage component decouples the power and communication lines, allowing them to share the same physical infrastructure while preventing direct interference, thus reducing wiring complexity without compromising signal integrity
Data Source
AI summary
A safety module for a field-bus system comprising a switch-on unit, a control unit, a supply input provided to feed supply power, a first supply output provided to relay secured supply power to a consumer, a first switching element to electrically connect or disconnect the supply input and the first supply output, and a supply module to provide an operating power via an operating-power-supply line for operating the control unit. The control unit is connected to the first switching element to secure the supply power being relayed via the first supply output by actuating the first switching element. The supply module is electrically connected to the supply input and to a field-bus-power input. The field-bus-power input is provided to feed a field-bus power into the safety module for operating the switch-on unit. The supply module is provided to generate the operating power either from the supply power or field-bus power.