Delta Switch Group for Electric Vehicle Power Systems
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Solution Overview
Problem
High-power electric vehicle systems require costly semiconductors for both driving and energy transmission, necessitating a cost-efficient solution for implementing electric drives and on-board power systems.
Innovation Solution
A motor vehicle on-board power system is designed with a delta switch group that connects the electric machine windings in a delta configuration, allowing a single switch to function for both generating the delta configuration and conducting energy between an energy storage unit and a DC external connection, eliminating the need for additional switches during energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate switches are used for delta configuration and energy transmission, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling the delta switch group to perform both delta configuration generation and energy transmission functions. The same switches that connect windings in delta configuration are also used to conduct energy between the energy storage unit and DC external connection during charging/discharging operations, eliminating the need for separate switches for each function.
Solution Approach 2:
The patent merges the delta configuration switch group and the energy transmission switch group into a single integrated switch group. This combination allows the system to achieve both winding configuration and power transmission capabilities using the same physical switches, thereby reducing overall device complexity and component count.
2Ease of operation
If additional switches are added for energy transmission, then ease of operation is improved, but manufacturing cost increases
Solution Approach 1:
The delta switch group is designed to serve multiple purposes: establishing delta configuration during motor operation and enabling energy transmission during charging/discharging. This multi-functional design eliminates the need for additional dedicated switches for energy transmission, thereby reducing manufacturing costs while maintaining full operational capability.
Solution Approach 2:
The system dynamically reconfigures the delta switch group based on operational mode. During motor operation, switches are arranged for delta configuration; during energy transmission, the same switches are reconfigured for power flow. This dynamic adaptability allows a single switch group to handle multiple functions without requiring additional components.
3Device complexity
If dual-function switches are used, then device complexity is reduced, but reliability may worsen due to functional interference
Solution Approach 1:
The control system dynamically manages the delta switch group based on operational requirements. When delta configuration is needed for motor operation, switches are positioned accordingly; when energy transmission is required, the same switches are reconfigured. This temporal separation of functions eliminates functional interference while maintaining the benefits of reduced device complexity.
Solution Approach 2:
The system alternates between different operational modes (motor operation and energy transmission) with the delta switch group being reconfigured periodically according to the required function. This periodic reconfiguration ensures that each function is performed with optimal switch arrangement, preventing functional interference while using the same physical components.
Data Source
AI summary
A motor vehicle on-board power system with a power converter, windings, an electric machine and a delta switch group is described. The electric machine is connected to the power converter, wherein a DC external connection is provided. The delta switch group connects the windings in a delta configuration. At least one switch of the delta switch group also connects at least one alternating current connection of the power converter to the DC external connection. A configuration controller actuates the delta switch group and has, on the one hand, the function of actuating the delta switch group in the closed state or open state within a driving state, according to a configuration specification. When energy is transmitted via the DC external connection, at least one switch of the delta switch group is actuated by the configuration controller according to a closed switching state. In addition, an associated method is described.