EVSE Arc Fault Detection for Charging Coupler and Port Arcing
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Solution Overview
Problem
Current electric vehicle supply equipment (EVSE) lacks a reliable solution to detect and prevent arcing between charging connectors and ports, which can be dangerous and damaging.
Innovation Solution
Integration of an arc fault detection circuit interruption (AFCI) device with a controller, processor, and firmware in the EVSE to detect arcing levels, compare them to thresholds, and analyze potential hazards, recommending repairs or replacements to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an arc fault detection circuit interruption (AFCI) type circuit breaker is wired in series in front of an EVSE, then arcing detection capability is improved, but device complexity and current handling capacity worsen due to the inability of existing AFCI breakers to handle the high currents required for EV charging
Solution Approach 1:
The patent divides the arcing detection function into separate components: a detection circuit that monitors for arcing conditions and a control system that responds to detected arcs. This segmentation allows the detection function to be integrated into the EVSE without requiring a complete replacement of the charging infrastructure with specialized high-current AFCI breakers.
Solution Approach 2:
The patent introduces an intermediary detection circuit and control system between the power source and the EVSE that can handle the arcing detection function. This intermediary layer allows existing EVSE hardware to be used while adding arc detection capability through separate sensing and control components rather than requiring the main breaker to handle both high current and arc detection.
2Adaptability or versatility
If standard connectors are used for EV charging, then ease of operation and adaptability are improved, but arc fault detection capability worsens due to the inability of standard connectors to provide arc detection signals
Solution Approach 1:
The patent uses an intermediary detection circuit that can detect arcing through the standard connector interface without requiring special multi-pin configurations. The detection circuit monitors electrical parameters through the existing connector pins to identify arcing conditions, allowing standard connectors to maintain compatibility while enabling arc fault detection capability.
Solution Approach 2:
The patent replaces the need for specialized mechanical connector configurations (such as multi-pin sensor wires) with an electrical detection approach. By monitoring electrical parameters through the existing connector pins, the system can detect arcing without requiring changes to the mechanical connector design or special wiring configurations.
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
Effectively detects and stops arcing before it becomes dangerous, ensuring safety and preventing equipment damage by accurately assessing and addressing arcing conditions between EVSE couplers and charge ports.
Implementation Method 1
detect an arcing level of arcing between the coupler and a charge port of the electric vehicle (EV) or any other series or parallel arcing within the EVSE
Data Source
AI summary
An electric vehicle supply equipment (EVSE) is provided with an integrated arc fault detection circuit interruption (AFCI) device to supply electricity to an electric vehicle (EV) being a load. The EVSE comprises a coupler and an AFCI device including: a controller including a processor and a memory, circuitry and computer-readable firmware code stored in the memory which, when executed by the processor, causes the controller to: detect an arcing level of arcing between the coupler and a charge port of the EV or any other series or parallel arcing within the EVSE, compare the arcing level to a threshold level to determine a hazardous nature of arching, and analyze the arcing level to determine not only if it is currently hazardous but if it is likely to become hazardous in a near term and recommend repair or replacement of the coupler and the charge port before damage occurs.