Integrated EV Power Conversion for Charging and Motor Drive
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Solution Overview
Problem
Electric vehicles have complex structural layouts due to separate components for charging and motor driving functions, leading to high costs and volume, necessitating integration of these functions to simplify the design and reduce size.
Innovation Solution
An energy conversion apparatus integrating alternating-current charging, motor driving, and direct-current charging functions using a three-phase converter, bridge arm circuit, and three-port converter, with switch groups controlling the modes of operation, allowing for a single system to perform multiple functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If charging function and motor driving function are separately laid out, then each function can be independently controlled, but the structural layout becomes complex and volume increases
Solution Approach 1:
The patent merges the charging function and motor driving function into a single integrated energy conversion apparatus. The same power conversion components (rectifier, DC-DC converter, inverter) and control unit are used for both AC charging and motor driving operations, eliminating the need for separate layouts while maintaining independent control through software-based mode switching.
Solution Approach 2:
The energy conversion apparatus is designed as a universal system that can perform multiple functions: AC charging, DC charging, and motor driving. The control unit automatically identifies the operating mode and configures the power conversion components accordingly, allowing a single apparatus to replace multiple separate systems.
2Reliability
If charging function and motor driving function are separately laid out, then each component can be optimized for its specific function, but costs and volume increase
Solution Approach 1:
The patent combines multiple power conversion functions into a single integrated apparatus with shared components. The rectifier, DC-DC converter, and inverter are merged into one system that serves both charging and motor driving functions, significantly reducing the overall volume compared to separate systems while maintaining function-specific performance through dedicated control algorithms.
Solution Approach 2:
The integrated energy conversion apparatus provides universal functionality for both AC/DC charging and motor driving operations. By using the same hardware platform for multiple purposes, the system achieves volume reduction while maintaining reliability through software-based optimization for each specific operating mode.
3Device complexity
If a single system performs multiple functions, then integration improves and volume reduces, but the control complexity increases
Solution Approach 1:
The control unit is designed as a universal controller that automatically identifies the operating mode (AC charging, DC charging, or motor driving) and configures the power conversion components accordingly. The control unit contains dedicated control algorithms for each function, switching between them based on mode detection, thereby managing control complexity through systematic organization rather than creating actual complexity.
Data Source
AI summary
Embodiments of this application provide an energy conversion apparatus, a power system, and a vehicle. The energy conversion apparatus includes a first switch group, a second switch group, a third switch group, a three-phase converter, a motor coil, a bridge arm circuit, and a three-port converter. The energy conversion apparatus is integrated with functions of alternating-current charging, motor driving, and direct-current charging, and can be installed on an electric vehicle to improve vehicle integration, thereby simplifying a structural layout of the electric vehicle, and reducing costs and a volume of the electric vehicle.