Circuit Breaker Control in DC Bus Power Supply for UPS Reliability
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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 reception and supply, and lack countermeasures for abnormal situations, leading to unstable operations and increased risk of failures.
Innovation Solution
A power supply system that includes circuit breakers to control power reception and supply among multiple power supply devices, allowing for a UPS function by opening and closing circuit breakers based on system conditions, and utilizing multiple power sources such as AC power sources and a battery power source to ensure uninterrupted power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power supply devices are connected through a common DC bus line to enable power reception and supply, then the system can achieve UPS function and improve power supply reliability, but system stability deteriorates and control complexity increases
Solution Approach 1:
The patent divides the power supply system into multiple independent power supply devices, each with its own circuit breaker. This segmentation allows each device to operate independently while maintaining overall system reliability, resolving the contradiction by enabling power reception/supply without compromising stability.
Solution Approach 2:
The patent introduces circuit breakers as intermediary devices between power supply devices and the DC bus line. These circuit breakers act as mediators that control power flow, enable isolation of faulty devices, and maintain system stability while allowing UPS functionality.
2Reliability
If multiple power supply devices are connected through a common DC bus line to enable power reception and supply, then the system can achieve UPS function, but device complexity increases
Solution Approach 1:
By segmenting the system into standardized power supply devices with uniform circuit breaker interfaces, the patent reduces configuration complexity despite having multiple devices. Each device follows the same modular structure, making the overall system easier to manage.
Solution Approach 2:
The patent makes each power supply device universal in its ability to both supply and receive power through the DC bus line. This multi-functionality simplifies the overall system design by eliminating the need for separate UPS devices, as each device can perform backup functions for others.
3Reliability
If circuit breakers are added to control power reception and supply among power supply devices, then system stability and reliability improve, but device complexity increases
Solution Approach 1:
The circuit breakers serve as simple intermediary switches that provide reliable control without adding complex functionality. Each circuit breaker has a straightforward on/off state, maintaining system reliability while minimizing control complexity through their binary operational nature.
Solution Approach 2:
The patent extracts the control function into separate circuit breaker devices that are independently operable. This separation allows the circuit breakers to be controlled individually based on system conditions, improving reliability without requiring complex integrated control systems.
Data Source
AI summary
The present specification relates to a power supply system which enables uninterruptible power supply, wherein a circuit breaker is provided to switch on/off each of electric circuits via which a plurality of power supply devices are connected, 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.