Isolated Multi-Output DC-DC Conversion for Flexible EV Charging Power
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Solution Overview
Problem
Existing DC-DC conversion apparatuses in charging piles face inefficiencies due to varying charging power requirements of electric vehicles, leading to low power utilization, resource waste, and reduced operation efficiency when charging vehicles with lower power needs.
Innovation Solution
A DC-DC conversion apparatus with a single input and multiple independent outputs, each connected to isolated conversion circuits, allowing flexible power adjustment and redundancy, enabling wide-range power outputs and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the maximum output power of the DC-DC conversion apparatus is continuously increased to meet high-power charging requirements, then the charging capability for electric vehicles with high power needs is improved, but the power utilization becomes low when charging vehicles with lower power requirements, causing resource waste and reduced operation efficiency
Solution Approach 1:
The DC-DC conversion apparatus is divided into multiple independent DC-DC conversion circuits (first, second, and third circuits) that can operate independently or in combination. Each circuit can be selectively activated based on the charging power requirements of different electric vehicles, allowing the system to segment its power output capability and avoid energy waste by only activating the necessary number of circuits.
2Device complexity
If a single high-power DC-DC conversion apparatus is used to serve multiple charging connectors, then the device complexity is reduced, but the adaptability to different charging power requirements and the system redundancy are insufficient
Solution Approach 1:
Multiple DC-DC conversion circuits share common input terminals connected to the same DC power supply, making each circuit universally compatible with the power source while providing different power output levels. This multi-functional design allows the system to adapt to various charging power requirements by selectively activating different combinations of circuits, and also provides redundancy since any single circuit can continue operating if others fail.
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
Enhances power utilization, reduces resource waste, and provides redundant backup capabilities, ensuring efficient charging across different vehicle types and states of charge.
Implementation Method 1
Each isolated DC-DC conversion circuit is configured to perform power conversion on a direct current output by the direct current power supply, and output a direct current obtained through conversion
Data Source
AI summary
A DC-DC conversion apparatus for a charging pile includes a group of power terminals, a plurality of groups of load terminals, and a plurality of isolated DC-DC conversion circuits. An input end of each isolated DC-DC conversion circuit is connected to the group of power terminals, and output ends of the plurality of isolated DC-DC conversion circuits are connected to the plurality of groups of load terminals in a one-to-one correspondence, so that the DC-DC conversion apparatus for a charging pile forms an architecture with a single input and a plurality of independent outputs. In this way, the DC-DC for a charging pile can have high power utilization while implementing wide-range power outputs.