Uninterruptible Power Supply Master-Slave Shutdown Control
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Solution Overview
Problem
In electrical systems with multiple consumers, the lack of basic supply voltage leads to uncoordinated shutdowns, risking data loss, undefined system states, and damage due to abrupt process interruptions, as individual consumers cannot prepare for impending shutdowns.
Innovation Solution
Implementing an uninterruptible power supply unit connected via a fieldbus for communication, with software modules acting as master and slaves to manage a controlled shutdown process, allowing consumers to prepare for a buffer phase by signaling the power supply unit's transition from normal to buffer operation, and enabling individualized switch-off sequences based on energy and time needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual electrical consumers are directly connected to the uninterruptible power supply without coordination, then each consumer can operate independently, but uncoordinated shutdowns occur leading to data loss and system damage
Solution Approach 1:
A master control unit is introduced as an intermediary between the uninterruptible power supply and multiple electrical consumers. The master receives shutdown signals from the power supply and coordinates the shutdown sequence by sending controlled shutdown commands to slave units in each consumer, ensuring synchronized and safe shutdown of all devices without data loss or system damage.
2Reliability
If a controlled shutdown process is implemented across multiple consumers, then data loss and system damage are prevented, but communication infrastructure and control mechanisms are required
Solution Approach 1:
The control system is segmented into a master control unit and multiple slave control units, each residing in different electrical consumers. This segmentation allows distributed control where each consumer manages its own shutdown process independently based on coordinated timing signals from the master, reducing the complexity of centralized control while ensuring data integrity across all devices.
3Duration of action of moving object
If the uninterruptible power supply provides buffer voltage for extended period, then more time is available for controlled shutdown, but energy storage capacity must be increased
Solution Approach 1:
The system dynamically adjusts the shutdown sequence based on the available energy capacity of the uninterruptible power supply. The master control unit receives information about the remaining buffer voltage duration and coordinates shutdown timing accordingly, optimizing the use of available energy to achieve controlled shutdown without requiring excessive energy storage capacity.
Data Source
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AI summary
The invention relates to an electrically operated system (50) for carrying out the method according to any one of claims 1 to 8, comprising a plurality of electrical loads (1, 2, 3, 4) connected to a basic supply voltage (6), and an uninterruptible power supply unit (5) configured to apply a buffer voltage (7) to the electrical loads (1, 2, 3, 4) in the event of a failure of the basic supply voltage (6) in order to ensure the supply of the electrical loads (1, 2, 3, 4) for a buffer period. According to the invention, it is provided that: ● the power supply unit (5) is configured to exchange data with the plurality of electrical loads (1, 2, 3, 4) via a fieldbus (8), ● the plurality of electrical loads (1, 2, 3, 4) each have a software module (11,...,14) which is designed to communicate via the fieldbus (8), ● the software module (15) of at least one consumer (1) is designed as a master (M) and the software modules (11,..., 14) of the other consumers (1,2,3,4) are designed as a slave (S) in the sense of master-slave communication, ● the power supply unit (5) is designed as a communication partner of the master (M) for carrying out a controlled shutdown process of the electrical consumers (1,2,3,4), ● the power supply unit (5) is designed to communicate the absence of the basic supply voltage (6) to the master (M) via the fieldbus (8).