EV Charging Station DC-to-AC Switching for Higher Throughput
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Solution Overview
Problem
Existing electric vehicle charging stations struggle to meet high demand, particularly at busy locations, and there is a need for systems that can efficiently manage charging infrastructure to accommodate multiple vehicles effectively.
Innovation Solution
An electric vehicle charging station that can automatically switch between direct current (DC) and alternating current (AC) charging modes, optimizing power distribution among multiple vehicles by monitoring state of charge and adjusting charging levels to maximize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a charging station uses only DC fast charging, then charging speed is improved, but the system cannot efficiently manage high volumes of vehicles during peak demand
Solution Approach 1:
The charging station dynamically switches between DC fast charging mode and AC charging mode based on real-time conditions. When the battery's state of charge exceeds a predefined level, the system automatically transitions from DC to AC charging, allowing flexible adaptation to different charging stages and optimizing both speed and overall productivity
Solution Approach 2:
The system changes the charging parameters by switching between two distinct charging modes (DC and AC) depending on the battery's state of charge. This parameter change allows the station to provide high-speed charging when needed and standard charging when the battery is sufficiently charged, thereby managing high volumes of vehicles effectively
2Productivity
If the charging station serves high volume of vehicles, then productivity is improved, but the complexity of managing multiple charging modes increases
Solution Approach 1:
The charging station is designed with multi-functionality, incorporating both DC fast charging capability and AC charging capability within a single system. This universal design allows the station to handle diverse charging needs of different vehicles and different charging stages, improving productivity without requiring separate dedicated stations for each charging type
Solution Approach 2:
The system uses automated dynamic switching between charging modes based on predefined criteria (battery state of charge levels). This automation reduces manual intervention and simplifies the management complexity by allowing the system to adapt to high vehicle volumes through programmed logic rather than complex manual coordination
3Duration of action of moving object
If DC charging is used for the entire charging cycle, then charging time is reduced, but energy efficiency decreases when battery is near full
Solution Approach 1:
The charging process is divided into periodic stages: initially using DC fast charging when the battery state of charge is below the predefined level, and then switching to AC charging when the state of charge exceeds the predefined level. This periodic action optimizes charging time during the bulk charging phase while improving energy efficiency during the topping-off phase
Solution Approach 2:
The system changes the charging parameter (from DC to AC mode) based on the battery's state of charge. This parameter change ensures that high-power DC charging is applied only when necessary (when battery is not yet full), and lower-power AC charging is used when the battery is near full, thereby reducing energy losses associated with excessive power delivery to an already charged battery
Data Source
AI summary
A method comprises charging an electric vehicle using a connector connected at a first end to a direct current power source and at a second end to the electric vehicle, monitoring a state of charge of the electric vehicle, and when the state of charge exceeds a predefined state of charge level: disconnecting the first end of the connector from the direct current power source, connecting the first end of the connector to an alternating current source, and charging the electric vehicle using the connector connected at the first end to the alternating current source while the second end remains connected to the electric vehicle.