Circuit Breaker Control on Shared DC Bus for UPS Continuity
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Solution Overview
Problem
Existing power supply systems with multiple devices connected through a common DC bus line face stability issues, difficulty in controlling power demand and supply, and lack countermeasures for abnormal situations, leading to unstable operations and increased risk of failures.
Innovation Solution
A power supply device and system that utilize circuit breakers to control power reception and supply among multiple power supply devices, enabling a UPS function by connecting or disconnecting devices from a bus line based on power states, and incorporating a battery for uninterrupted power supply during interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power supply devices are connected through a common DC bus line to enable power sharing, then power supply flexibility is improved, but system stability deteriorates
Solution Approach 1:
The system segments the power supply network by providing separate circuit breakers for each power supply device connected to the DC bus line. This allows individual control and isolation of each device, maintaining system stability while preserving the flexibility of having multiple devices connected. The circuit breakers create discrete controllable segments in what would otherwise be a tightly coupled system.
2Adaptability or versatility
If multiple power supply devices are connected through a common DC bus line to enable power sharing, then power supply flexibility is improved, but control difficulty increases
Solution Approach 1:
Each power supply device is equipped with its own circuit breaker that can be independently controlled based on the operational state of that specific device. This self-service approach allows each device to manage its own connection to the bus line, simplifying the overall control architecture while maintaining the ability to flexibly manage power distribution across multiple devices.
3Reliability
If a UPS device is added to provide backup power for abnormal conditions, then power supply reliability is improved, but system complexity increases
Solution Approach 1:
The circuit breakers installed on each power supply device serve multiple functions: they enable normal operational control of power flow, provide isolation for maintenance, and act as protective devices for abnormal conditions. This multi-functionality eliminates the need for separate UPS-specific protection mechanisms, achieving reliable backup power capability without proportionally increasing system complexity.
4Reliability
If circuit breakers are used to control connection and disconnection between power supply devices and bus line, then system reliability is improved, but device complexity increases
Solution Approach 1:
Circuit breakers are pre-installed on each power supply device before operation begins. This preliminary preparation ensures that protective and control functionality is already in place, allowing for immediate and reliable response to abnormal conditions without requiring additional complexity during operational decision-making. The infrastructure is built in advance to simplify real-time control.
Data Source
AI summary
The present specification relates to a power supply device and a power supply system which enable uninterruptible power supply, wherein a circuit breaker is provided in a power bus to which a plurality of power supply devices are connected, so as to switch on/off the connected power supply devices, and thus the UPS function can be performed among the plurality of power supply devices by opening or closing the circuit breaker according to various situations occurring in the system to control power reception and supply.