Galvanic Isolation via High-Frequency DC/DC Controller
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Solution Overview
Problem
Existing power electronics systems in electric vehicle charging stations face challenges in achieving space-saving and efficient galvanic isolation, particularly due to the high cost and size of output-side DC/DC converters and the need for additional transformers in current solutions.
Innovation Solution
Implementing a high-clock frequency DC/DC controller directly downstream of the AC/DC converter for galvanic isolation, which allows for a series resonant converter configuration that minimizes space requirements and maximizes efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output-side DC/DC converters are used for galvanic isolation, then galvanic isolation is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent introduces a neutral point as an intermediary element in the three-phase bridge circuit. This neutral point enables galvanic isolation without requiring complex output-side DC/DC converters or additional transformers. The neutral point serves as a mediator that provides the necessary isolation while maintaining system simplicity and reducing cost.
2Reliability
If additional separate transformer is added for galvanic isolation, then galvanic isolation is achieved, but installation space requirements increase
Solution Approach 1:
The patent merges the galvanic isolation function with the existing three-phase bridge circuit by utilizing its neutral point. Instead of adding a separate transformer that would occupy additional space, the isolation function is integrated into the circuit architecture itself. This merging eliminates the need for extra components and reduces overall installation space requirements.
3Reliability
If high power DC/DC converters are used for galvanic isolation, then galvanic isolation is achieved, but cost increases due to high power requirements
Solution Approach 1:
The neutral point acts as an intermediary that provides galvanic isolation without requiring high power DC/DC converters. By using this circuit-based isolation method instead of power-intensive converter solutions, the patent significantly reduces manufacturing costs while maintaining effective galvanic isolation.
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 enables a compact, cost-effective, and efficient galvanic isolation in the power electronics system of charging stations, meeting space and safety standards while reducing installation space requirements.
Implementation Method 1
a galvanic isolation, which is technically implemented in a DC/DC controller having a high clock frequency directly downstream of the AC/DC controller
Implementation Method 2
A realization as a series resonant converter, the magnitudes of which in respect of the high clock frequency are minimized and which have the greatest possible efficiency
Data Source
AI summary
A galvanic isolation in the power electronics system of an electricity charging station having the following features: a rectifier (11) for connection of the charging station (10) to a public low-voltage network and a galvanically isolating DC voltage converter (12) having a high clock frequency and connected to the rectifier (11) and a corresponding electricity charging station.