Solid-State Circuit Interrupter for Arc Fault Detection
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Solution Overview
Problem
Existing electrical protection systems, such as fuses and circuit breakers, are inadequate in detecting and addressing series arc faults, which can lead to fires, and require complex circuitry for sophisticated fault detection, necessitating a compact, low-power, all-solid-state solution for integrated ground fault and arc fault protection.
Innovation Solution
A fully solid-state circuit configuration incorporating efficient AC to DC power conversion, low-voltage DC power supply, mains voltage and current sensing, and high-voltage electronic switching, using power MOSFETs and a novel floating control circuit with optical control for bidirectional switching, along with a fault detection processor for accurate fault detection and disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sophisticated arc fault sensing schemes are implemented, then arc fault detection capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex electromechanical sensing schemes with a solid-state electronic system using a microprocessor and solid-state switches. The microprocessor analyzes voltage and current waveforms to detect arc faults, replacing bulky electromechanical devices with integrated electronic circuitry that provides both sophisticated detection and compact form factor.
Solution Approach 2:
The solid-state circuit integrator performs multiple functions including arc fault detection, ground fault detection, and circuit interruption within a single device. The system uses a microprocessor to analyze both voltage and current waveforms, enabling detection of parallel and series arc faults, ground faults, and overcurrent conditions through unified processing logic.
2Volume of moving object
If solid-state circuit configuration is used, then device compactness and power efficiency are improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple discrete solid-state components (microprocessor, voltage sensing circuitry, current sensing circuitry, solid-state switches, and energy storage elements) into an integrated circuit configuration. This merging reduces the overall device volume while consolidating manufacturing processes, as the integrated design allows for standardized production techniques.
Solution Approach 2:
The system uses solid-state switches that replicate the functionality of mechanical contacts without the physical wear and bulk. The electronic switching elements copy the on/off behavior of traditional breakers while enabling compact integration and reduced power consumption through solid-state physics rather than mechanical movement.
3Reliability
If continuous operation at reduced voltage is implemented, then arc prevention is improved, but power delivery capability is reduced
Solution Approach 1:
The patent implements dynamic voltage control where the solid-state circuit integrator continuously monitors load conditions and adjusts the output voltage accordingly. When arc fault indicators are detected, the system reduces voltage to prevent arcing; when normal operation is detected, full power is restored. This dynamic adjustment allows the system to maintain arc prevention while preserving full power delivery capability when needed.
Solution Approach 2:
The microprocessor continuously analyzes voltage and current waveforms from the load and uses this feedback to control the solid-state switches. The feedback loop detects arc fault conditions through waveform analysis and automatically adjusts the output voltage to prevent arcs, while monitoring for normal operation conditions that would permit full power delivery.
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
The solution provides effective protection against ground faults and arc faults, reducing power dissipation and heat generation, while maintaining efficiency and compactness, allowing for continuous operation at reduced voltage to prevent arcing and facilitate fault characterization.
Implementation Method 1
an isolated optical source to provide the control signal for the bidirectional electronic switch
Implementation Method 2
While the switch is closed, energy is accumulated and stored in a shunt energy storage element
Data Source
AI summary
The invention relates to a novel approach for the protection of electrical circuits from ground faults and parallel and series arc faults in a fully solid-state circuit configuration. Solid-state circuits and methods of use are described that provide the key functions of low-voltage DC power supply, mains voltage and current sensing, fault detection processing and high voltage electronic switching.