Excitation Fuse Circuit for UPS Fault Isolation Under Short Circuits
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Solution Overview
Problem
Conventional UPS systems fail to isolate a faulty module effectively, leading to overvoltage and potential explosion due to short circuits, especially in modular setups, causing the entire system to fail.
Innovation Solution
An excitation fuse device with a voltage detection circuit, fusing controller, and fuse circuit is introduced to detect and control the faulty side in a short-circuit fault, using a detonating breaker to isolate the fault without affecting other modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only power fuses are used in conventional UPS systems, then the system structure is simple, but a short circuit on one half of the bus causes full battery voltage to be applied to the other half, resulting in overvoltage and system failure
Solution Approach 1:
The fuse device is segmented into two independent functional modules: a power fuse for basic overcurrent protection and an excitation fuse with detonating breaker for controlled fault isolation. This segmentation allows each module to specialize in its function, enabling reliable fault isolation while maintaining overall system structure clarity.
Solution Approach 2:
The excitation fuse with detonating breaker acts as an intermediary component between the power fuse and the faulty circuit. When activated, it provides controlled isolation of the faulty half of the bus, preventing overvoltage from affecting the entire system while maintaining a relatively simple overall circuit architecture.
2Reliability
If conventional power fuses are used, then the device complexity is low, but fault isolation is ineffective causing the entire UPS system to fail
Solution Approach 1:
The fuse device is segmented into two independent functional modules: a power fuse for basic overcurrent protection and an excitation fuse with detonating breaker for controlled fault isolation. This segmentation allows each module to specialize in its function, enabling reliable fault isolation while maintaining overall system structure clarity.
Solution Approach 2:
The voltage detection circuit automatically detects overvoltage conditions and triggers the detonating breaker without requiring external intervention. This self-service mechanism ensures rapid fault isolation while keeping the control system simple, as the device monitors and responds to faults autonomously.
3Reliability
If the detonating breaker is added to create an excitation fuse, then fault isolation is improved, but the device complexity increases
Solution Approach 1:
The detonating breaker function is extracted as a separate, dedicated component within the excitation fuse module, distinct from the power fuse. This extraction allows the fault isolation mechanism to be implemented with high precision while keeping the overall device structure organized and manageable through clear functional separation.
Solution Approach 2:
The excitation fuse with detonating breaker is pre-configured and ready to activate immediately upon detecting a fault condition. This preliminary preparation enables rapid fault isolation without requiring complex real-time decision-making circuits, thereby improving fault isolation precision while limiting the increase in device complexity.
4Measurement precision
If voltage detection and control circuits are added, then the precision of fault detection is improved, but the device complexity increases
Solution Approach 1:
The voltage detection circuit automatically detects overvoltage conditions and triggers the detonating breaker without requiring external intervention. This self-service mechanism ensures rapid fault isolation while keeping the control system simple, as the device monitors and responds to faults autonomously.
Solution Approach 2:
The excitation fuse with detonating breaker is pre-configured and ready to activate immediately upon detecting a fault condition. This preliminary preparation enables rapid fault isolation without requiring complex real-time decision-making circuits, thereby improving fault isolation precision while limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents UPS system failure by accurately identifying and isolating the faulty side, reducing maintenance downtime and preventing overvoltage expansion.
Implementation Method 1
a voltage detection circuit, configured to detect a voltage of the excitation fuse device and generate a voltage detection signal based on the voltage of the excitation fuse device and a reference voltage
Implementation Method 2
the excitation fuse includes a current fuse and a detonating breaker; the fuse circuit is configured to generate a fusing control signal for switching off the detonating breaker
Data Source
AI summary
An excitation fuse device and a UPS battery circuit are provided including an excitation fuse and a voltage driving control module including a voltage detection circuit to detect a fuse device voltage and generate a voltage detection signal based on the fuse device voltage and a reference voltage, a fusing controller to receive voltage detection signal and generate a voltage control signal based on voltage detection signal and a fuse detection signal, and a fuse circuit to generate a fusing control signal based on the voltage control signal, which includes a current fuse to be fused based on a short-circuit current and a detonating breaker to be switched off based on the fusing control signal. The current fuse is connected to the fuse circuit through the detonating breaker, the fusing controller is connected to the voltage detection circuit, the fuse circuit and the excitation fuse.