Single-Phase EV Charger Conversion for Rural DC Fast Charging
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Solution Overview
Problem
The widespread adoption of electric vehicles is hindered by the lack of infrastructure capable of supporting rapid DC charging in rural areas, where single-phase electric power delivery is common and often insufficient, leading to 'range anxiety' and limited access to high-capacity charging facilities due to the inability of existing power grids to handle the electrical demands of DC fast charging systems.
Innovation Solution
A high-capacity converter system that converts single-phase utility power to multi-phase power, integrated with energy storage and a controller for efficient power delivery and demand management, enabling reliable operation during power outages and fluctuations, and optimizing charging rates based on utility power availability and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DC fast charging systems are deployed in rural areas with single-phase power infrastructure, then charging capacity and speed are improved, but power supply stability and consistency deteriorate due to single-phase limitations
Solution Approach 1:
The patent introduces a power conversion system as an intermediary between the single-phase utility power source and the DC fast charger. This converter system transforms single-phase AC power into stable multi-phase AC power, enabling the charger to operate reliably despite the limitations of single-phase infrastructure. The intermediary device bridges the gap between incompatible power sources and charging equipment.
2Device complexity
If single-phase power infrastructure is used in rural areas, then infrastructure cost and complexity are reduced, but charging rate and power delivery capacity are limited
Solution Approach 1:
The patent changes the electrical parameters of the power supply by converting from single-phase to multi-phase AC power. This parameter transformation enables the system to deliver higher power levels required for DC fast charging while maintaining compatibility with existing single-phase utility infrastructure. The conversion system adjusts voltage, current, and phase characteristics to meet charging demands.
3Loss of time
If rapid DC charging is implemented, then charging time is reduced, but power quality requirements and electrical capacity demands increase
Solution Approach 1:
The patent incorporates a control system that continuously monitors power quality parameters and charging status, then adjusts operational parameters in real-time. This feedback mechanism ensures stable power delivery during rapid charging by dynamically responding to changes in load conditions, utility power quality, and battery charging state, thereby meeting stringent power quality requirements.
4Device complexity
If DC fast charging stations are deployed without energy storage, then system simplicity is maintained, but ability to handle inconsistent power delivery and outages is reduced
Solution Approach 1:
The patent incorporates energy storage systems that are pre-charged during periods of low demand or stable power availability. This preliminary action allows the system to draw from stored energy during power outages, fluctuations, or high-demand periods when utility power is inconsistent, ensuring continuous and reliable charging operation without requiring complex real-time power management.
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 allows for the reliable operation of rapid DC charging stations in areas with single-phase power infrastructure, reducing 'range anxiety' and enhancing the adoption of electric vehicles by ensuring consistent and efficient charging capabilities, even in areas with limited electrical capacity and inconsistent power delivery.
Implementation Method 1
A high-capacity converter connected to a single-phase utility supply converts single-phase input power to a multi-phase power output
Implementation Method 2
A high-capacity energy storage system is integrated with the converter to enable the system to overcome the challenges inherent with restricted capacity and inconsistent power delivery
Data Source
AI summary
Electrical power is supplied to an electric vehicle rapid DC charging station requiring a multi-phase electrical input, by converting single phase utility power using high-capacity converters of various designs. In certain embodiments, a low-capacity converter may also be coupled to single-phase utility power input for provision of power to the charging station when no vehicle is present for charging. In these embodiments, a transfer switch selectively couples the high-capacity converter or low-capacity converter to the rapid charging station as needed to charge an electric vehicle. Other embodiments may also include energy storage devices for enhancing charge rates or providing charging during periods of inadequate power availability or poor utility power quality.