Dual-Port EV Charging Control for Combined AC and DC Charging
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Solution Overview
Problem
Conventional home charging devices for electric vehicles are limited to a single charging port and capacity, and the use of automatic connection devices (ACD-U) can lead to inefficiencies and failures in charging when only one port is used, restricting charging capacity and flexibility.
Innovation Solution
A system and method for controlling maximum charging using a home charging device that allows simultaneous charging through both a conventional charging port and an automatic connection device (ADC) by utilizing a vehicle with on-board and external chargers connected to multiple charging ports, including AC and DC lines, and a bypass circuit for parallel operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single charging port is used in conventional home charging devices, then the device structure is simple and easy to operate, but the charging capacity is limited to the maximum capacity of a DC charger
Solution Approach 1:
The charging system is divided into two independent charging paths: AC charging path (through on-board charger) and DC charging path (through external charger). Each path can operate independently or simultaneously, allowing the system to achieve higher total charging capacity while maintaining simple individual component structures
Solution Approach 2:
The home charging device is designed to support multiple charging modes (single AC charging, single DC charging, and combined AC+DC charging) through a unified system architecture. The external charger can function as both a standalone DC charger and a supplementary component working with the on-board charger, providing multi-functionality without requiring completely separate systems
2Extent of automation
If an automatic connection device (ACD-U) is used for charging connection, then human connection operation is automated, but charging may not be made when the ACD-U device fails and the conventional charging port cannot be used
Solution Approach 1:
The system provides a backup charging path through the conventional charging port that can be used when the ACD-U device fails. This redundant configuration ensures charging availability is maintained even when the automated connection device is malfunctioning, preventing complete charging failure
Solution Approach 2:
The control unit acts as an intermediary that manages multiple charging paths and connection methods. It can selectively activate different charging modes (ACD-U automated connection, conventional port with manual connection, or combined modes) based on system status and requirements, providing flexibility and reliability
3Adaptability or versatility
If electric vehicles have two types of charging ports for conventional charging port and ACD-U, then compatibility with conventional infrastructure is achieved, but charging through only one charging port causes inefficiency
Solution Approach 1:
The system merges AC charging and DC charging paths into a unified dual-charging system that can operate simultaneously. By combining the power from both charging ports through coordinated control of the on-board charger and external charger, the system achieves charging speeds and capacities exceeding what either port could provide independently, thereby improving overall charging efficiency
Data Source
AI summary
A system capable of charging connection to both a conventional charging port and an automatic connection device (ACD) can include a vehicle having an on-board charger connected to a plurality of charging ports, and an external charger electrically, communicatively connected to the vehicle and providing at least one of first charging power converted by transmitting supply power from a distribution board to the on-board charger and second charging power converted through a built-in power converter so that single charging or combined charging can be performed by changing a plurality of charging lines.