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 to differentiate between arc faults and loads like switching power supplies and dimmer circuits, necessitating a compact, low-power, all-solid-state solution for ground 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 fault detection processing, utilizing power MOSFETs and an optical control circuit for bidirectional switching, along with a fault detection processor to manage ground and arc faults by disconnecting the load from the mains when faults are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex arc fault sensing schemes are used to detect series arc faults, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical/electromechanical sensing schemes with a solid-state electronic system using a microprocessor and solid-state switches. The microprocessor implements sophisticated arc fault detection algorithms that analyze current waveforms to distinguish series arc faults from normal loads, while solid-state switches provide rapid circuit interruption. This substitution achieves high detection reliability without the bulk and complexity of traditional electromechanical devices.
Solution Approach 2:
The patent integrates multiple functions into a single solid-state device: arc fault detection, ground fault detection, load monitoring, and circuit interruption all occur within one unit. The microprocessor serves as a universal control element that handles various detection algorithms and control functions, eliminating the need for separate dedicated circuits for each function and reducing overall device complexity.
2Device complexity
If solid-state electronic switches are used instead of electromechanical breakers, then device complexity is reduced and compactness is improved, but power dissipation increases
Solution Approach 1:
The patent employs solid-state electronic switches that operate in periodic switching mode rather than continuous conduction. The switches rapidly turn on and off based on AC waveform detection, remaining in high-impedance off-state most of the time. This periodic action minimizes the time switches conduct current, thereby reducing power dissipation while maintaining effective circuit protection capability.
Solution Approach 2:
The patent utilizes the dynamic parameter changes of solid-state switches between on and off states to control power flow. By precisely controlling the switching timing and duration based on detected voltage and current parameters, the system minimizes conduction losses while maintaining protection functionality. The switches transition between high-impedance and low-impedance states to optimize power dissipation characteristics.
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
This solution provides a compact, efficient, and cost-effective protection against ground and arc faults, reducing power dissipation and heat generation, while minimizing false triggers and enabling continued operation at reduced voltage to prevent damage and facilitate fault characterization.
Implementation Method 1
utilizing power MOSFETs and an optical control circuit for bidirectional switching
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.