Power Supply System Gradual Battery Module Disconnection
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Solution Overview
Problem
In power supply systems with multiple modules connected in parallel, low current flow can lead to increased errors in state detection and misunderstanding of the system's status, particularly when the power demand is low, and high voltage applications require appropriate termination of the power supply to prevent device failure.
Innovation Solution
A power supply system with a control device that operates switching elements to gradually disconnect battery modules from the main line, using a system breaker to cut off connection and a sweep module configuration that includes a battery module, input/output circuit, and switching elements to manage the connection and disconnection of battery modules, thereby controlling the string voltage and preventing device failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power supply devices are incorporated in parallel to increase system capacity, then the system can meet higher power demands, but when power demand is low the current through each device becomes small which increases detection errors and causes misunderstanding of device state
Solution Approach 1:
The power supply system is divided into multiple independent strings, each with its own breaker and control mechanisms. This segmentation allows individual strings to be managed separately, enabling the system to maintain adequate current levels in active strings while keeping overall system capacity high through parallel configuration.
Solution Approach 2:
The system dynamically adjusts the number of active battery modules through the stopping process, switching modules between connected and disconnected states based on current flow conditions. This dynamic reconfiguration ensures that active modules operate at optimal current levels for accurate state detection while maintaining overall system flexibility.
2Ease of operation
If all battery modules remain connected to the main line during system shutdown, then the shutdown process is simple, but high voltage remains applied to connected devices which can cause device failure
Solution Approach 1:
The system performs preliminary disconnection actions by sequentially disconnecting battery modules from the main line before complete system shutdown. This preliminary action reduces voltage on the main line in advance, preventing high voltage damage to connected devices while maintaining a structured shutdown sequence.
Solution Approach 2:
The stopping process maintains continuous control over the shutdown sequence, systematically transitioning battery modules from connected to disconnected states. This continuous controlled process ensures voltage is gradually reduced without abrupt changes that could damage devices, while ultimately achieving complete system shutdown.
3Speed
If the system breaker cuts off connection immediately during shutdown, then the shutdown is fast, but devices on the main line are exposed to high voltage which increases failure risk
Solution Approach 1:
Before the system breaker cuts off connection, the stopping process preliminarily disconnects battery modules in sequence, reducing voltage on the main line in advance. This preliminary voltage reduction protects devices from high voltage exposure during the brief period when the breaker is opening, combining speed with device protection.
Data Source
AI summary
A control device of a power supply system includes a stopping process unit. The stopping process unit is configured to operate a switching element when connection between a power system and a main line is cut off by a system breaker and to perform a stopping process of sequentially switching battery modules which are connected to the main line such that the number of battery modules which are connected to the main line decreases gradually.