EV Charger Switching Control for Multi-Vehicle Over-Discharge Prevention
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Solution Overview
Problem
Existing systems for managing the charging and discharging of multiple electric vehicles (EVs) are labor-intensive and costly, particularly when it comes to preventing over-discharge, which can lead to equipment failure and safety issues.
Innovation Solution
A charging/discharging management system that includes multiple output parts for connecting EVs and a charger with a power supply part, switching part, and controller. The controller acquires information on the charge amounts of the EVs and automatically starts charging EVs that have reached or dropped below a predetermined charging start value, while ending charging when the charge amount reaches a set end value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple chargers are prepared to charge multiple EVs simultaneously, then charging efficiency and productivity are improved, but equipment cost increases
Solution Approach 1:
The charger is designed with a switching part that enables a single charger to serve multiple EVs sequentially. The switching part can connect the power supply part to different output parts corresponding to different EVs, allowing one charger to perform the function of multiple chargers through time-multiplexed operation.
Solution Approach 2:
The system dynamically switches the connection between the power supply part and different EVs based on their charging needs. The switching part changes the circuit configuration in real-time, connecting to the EV that requires charging at each moment, thereby making the single charger adaptable to multiple vehicles.
2Ease of operation
If employees manually check and connect EVs to chargers, then charging management is achieved, but labor cost and operation complexity increase
Solution Approach 1:
The system automatically monitors the charge amounts of power storage devices in connected EVs and autonomously determines which EVs need charging. The controller initiates charging operations without human intervention, and the switching part automatically connects the appropriate EVs to the power supply, making the system self-managing.
Solution Approach 2:
The controller continuously acquires information related to charge amounts of power storage devices and uses this feedback to automatically control the switching part and power supply part. This closed-loop control enables the system to respond to the charging status of EVs and adjust operations accordingly without manual input.
3Reliability
If regular charging is performed to suppress over-discharge, then power storage device reliability is improved, but charging operation complexity increases
Solution Approach 1:
The system proactively charges power storage devices before they reach the over-discharged state. By monitoring charge amounts and initiating charging when the charge amount reaches or drops below a charging start value, the system prevents over-discharge before it occurs, ensuring reliability through advance action.
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 system effectively suppresses over-discharge of multiple EVs while minimizing equipment costs, as it allows for automatic charging without the need for manual labor, and can manage multiple EVs with a single charger.
Implementation Method 1
a power supply part configured to convert the power supplied from the power supply into direct current power corresponding to the EVs
Data Source
AI summary
A charging/discharging management system includes a plurality of output parts used to connect with EVs, and a charger connected to a power supply. The charger is configured to charge the EVs connected to the plurality of output parts based on power supplied from the power supply. The charger includes a power supply part configured to convert the power supplied from the power supply into direct current power corresponding to the EVs, a switching part connected with the power supply part and connected with each of the plurality of output parts, and a controller connected with the power supply part and the switching part. The switching part is configured to switch paths between the power supply part and the plurality of output parts. The switching part is configured to supply direct current power output from the power supply part to one of the plurality of output parts.