SiC Power Module for EV Charging Stations
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Solution Overview
Problem
Existing charging stations for electric vehicles often require galvanic isolation in their power electronics, leading to inefficiencies and bulkier designs that complicate maintenance and visibility in road traffic.
Innovation Solution
A power electronic module with a high-switching-frequency converter topology and silicon carbide MOSFETs, eliminating the need for galvanic isolation by using active power factor correction and diodes to prevent backflow, resulting in a compact, efficient, and easily maintainable design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galvanic isolation is used in power electronics, then safety and reliability are improved, but device mass and volume increase
Solution Approach 1:
The patent extracts and eliminates the galvanic isolation component from the power electronic module. By using a high-switching-frequency converter topology with silicon carbide MOSFETs and active power factor correction, the system achieves safe operation without requiring traditional galvanic isolation, thereby reducing device mass while maintaining reliability
Solution Approach 2:
The patent changes the operating parameters by using high-switching-frequency converter topology and silicon carbide MOSFETs. These parameter changes enable the system to operate safely without galvanic isolation, resolving the contradiction between safety requirements and mass reduction
2Reliability
If conventional IGBT technology and standard circuits are used, then reliability is improved, but device complexity and maintenance difficulty increase
Solution Approach 1:
The patent employs silicon carbide MOSFETs which, while advanced, enable a more compact and potentially replaceable module design. The modular power electronic module with mass less than 40 kg can be easily lifted and replaced by maintenance personnel, simplifying repair processes even though the individual components are sophisticated
3Object-affected harmful factors
If internal galvanic isolation is implemented, then electrical safety is improved, but visibility obstruction in road traffic increases
Solution Approach 1:
The patent removes the galvanic isolation component that would increase the physical size of the charging station. By eliminating this component through the use of high-switching-frequency converters and silicon carbide MOSFETs, the overall footprint and visual obstruction of the charging station is reduced while maintaining electrical safety
Solution Approach 2:
The patent changes the electrical operating parameters by using high-frequency switching and silicon carbide technology, enabling a more compact design that reduces visual obstruction while maintaining safety through alternative protection mechanisms
4Weight of stationary object
If high switching frequency converter topology is used, then device mass is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses silicon carbide MOSFETs, which are composite semiconductor materials combining silicon and carbide properties. These materials enable high-switching-frequency operation with improved thermal and electrical characteristics, achieving mass reduction while managing the precision requirements through superior material properties
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
The solution achieves high efficiency (>96%) and reduced mass (<40 kg) for the module, enhancing maintenance ease and minimizing visual obstruction in road traffic.
Implementation Method 1
The use of MOSFETs on the basis of silicon carbide (SiC) may further enhance the apparatus with regard to mass, efficiency and structural space
Implementation Method 2
active power factor correction and diodes to prevent backflow
Data Source
AI summary
A power electronic module (10) for a charging station having an input-side power factor correction circuit, a voltage link and an output-side DC chopper. The power factor correction circuit is of three-phase (11) design for three-phase current; each phase (11) has at least one high-voltage-side switch and one low-voltage-side switch; and diodes that prevent current from flowing back are installed. Also disclosed is a corresponding charging station and an electricity charging station.