EV Charging Voltage Matching with Boost Converter Control
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Solution Overview
Problem
The existing charging systems for battery electric vehicles face challenges in efficiently matching the output voltage of power feed devices with the voltage requirements of vehicles, often necessitating a handshake protocol to adjust variables before charging, which can be complex and inefficient.
Innovation Solution
The system simplifies the handshake protocol by allowing the automobile to notify the power feed device of the suitable charging voltage, and the power feed device raises its output voltage to the lowest rated output voltage for a leakage check, enabling the automobile to identify and adjust the supply voltage as needed, either matching it or boosting it using a boost converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a handshake protocol is used to exchange voltage information between power feed device and automobile, then voltage matching can be achieved, but the charging process becomes complex and time-consuming
Solution Approach 1:
The patent extracts the voltage information notification function from the complex handshake protocol. The automobile controller directly notifies the power feed device controller of the charging voltage through a simplified communication mechanism, eliminating the need for multiple iterative exchanges while ensuring accurate voltage matching between the power feed device and battery electric vehicle
Solution Approach 2:
The patent implements preliminary action by having the automobile controller notify the power feed device controller of the charging voltage before the leakage check is performed. This advance notification allows the power feed device to prepare the appropriate output voltage, eliminating the need for post-negotiation adjustments and reducing overall charging setup time
2Loss of information
If the automobile monitors output end voltage during leakage check, then supply voltage can be identified, but communication overhead increases
Solution Approach 1:
The patent implements self-service by having the automobile controller autonomously monitor the output end voltage during the leakage check to identify the supply voltage. This self-monitoring eliminates the need for the power feed device to explicitly communicate voltage information through additional messages, reducing communication overhead while ensuring the automobile has the necessary information for subsequent charging operations
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 approach streamlines the charging process by eliminating the need for explicit communication of the supply voltage, allowing for direct charging when voltages match and efficient voltage adjustment when they do not, while ensuring safety through leakage checks as per international standards.
Implementation Method 1
the automobile raises the supply voltage to the charging voltage using a boost converter
Data Source
AI summary
The automobile controller notifies the controller of the power feed device (power supply controller) of the charging voltage prior to charging the battery. After receiving the charging voltage, the power feed controller raises the voltage at the output end of the power supply device to the supply voltage that is lower than its own rated output voltage and the charging voltage. The automobile controller monitors the voltage at the output end to identify the supply voltage while the power feed controller performs a ground fault check. The automobile controller (1) charges the battery with electric power of the supply voltage if the supply voltage is equal to the charge voltage, and (2) drives a boost converter to reduce the supply voltage to the charge voltage if the supply voltage is lower than the charge voltage, and then charge the battery with electric power from the power feed device.