Solid-State DC Circuit Breaker for Fault Isolation and Low Power Loss
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Summary
Problems
Current DC circuit breakers face challenges in minimizing parasitic power loss and rapidly isolating faults in DC applications, with existing solutions experiencing issues such as high on-state power losses, fault detection time, and source current ringing.
Innovation solutions
A solid-state DC circuit breaker utilizing magnetic coupling instead of a crossed connection, featuring a switch in series with an inductor and a magnetically coupled inductor with a grounded capacitor, allowing for automatic fault detection and isolation without source current ringing, and minimizing parasitic power loss.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a hybrid mechanical/electrical breaker is used, then low power losses during normal operation are achieved, but significant fault current can be experienced before the fault is isolated due to fault detection time
Why choose this principle:
The patent replaces the mechanical switch component with a solid-state switch (transistor) to eliminate mechanical wear and enable faster switching. The solid-state switch can respond to fault conditions much more quickly than mechanical contacts, reducing the time during which fault current flows while maintaining low normal power losses through efficient solid-state conduction.
Principle concept:
If a hybrid mechanical/electrical breaker is used, then low power losses during normal operation are achieved, but significant fault current can be experienced before the fault is isolated due to fault detection time
Why choose this principle:
The breaker incorporates an automatic fault detection and response mechanism where the circuit itself generates the signal to trigger the solid-state switch. When a fault condition occurs, the circuit automatically activates the solid-state switch to isolate the fault without requiring external intervention or complex control systems, achieving both speed and energy efficiency.
Application Domain
Data Source
AI summary:
A solid-state DC circuit breaker utilizing magnetic coupling instead of a crossed connection, featuring a switch in series with an inductor and a magnetically coupled inductor with a grounded capacitor, allowing for automatic fault detection and isolation without source current ringing, and minimizing parasitic power loss.
Abstract
An improved DC circuit breaker is provided for automatically detecting and isolating a fault between a source and a ground. The DC circuit breaker comprises at least one switch, in electrical series with a first inductor between the source and a load, and a second inductor magnetically coupled to the first inductor wherein a first side of the second inductor is electrically connected to the load and a second side of the second inductor is grounded through a capacitor.