Dual Inverter Charging System for Simultaneous Voltage Source Management
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Solution Overview
Problem
Existing charging systems for alternating-current electric motors with open-end windings are not adaptable to direct-current high-speed chargers like CHAdeMO or combined charging systems (CCS), as they cannot appropriately charge two voltage sources simultaneously.
Innovation Solution
A charging system comprising a first and second inverter, each with multiple switching elements, and at least three switches, allowing for individual or simultaneous charging of two voltage sources by controlling the switching elements and switches, enabling parallel or serial charging based on the charger's voltage specification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a known charging system for alternating-current electric motors with open-end windings is used, then the system can drive the motor with separated neutral points, but it cannot appropriately charge two voltage sources simultaneously and is not adaptable to direct-current high-speed chargers
Solution Approach 1:
The charging system is segmented into a first inverter and a second inverter, each independently capable of charging one of the two voltage sources. This segmentation allows the system to handle DC high-speed charging by distributing the charging current through separate pathways, enabling adaptability to DC chargers while maintaining reliable charging capability for both voltage sources.
Solution Approach 2:
Each inverter is designed to perform multiple functions: the first inverter can charge the first voltage source, the second inverter can charge the second voltage source, and both can operate simultaneously. This multi-functionality enables the system to adapt to different charging standards (CHAdeMO and CCS) while ensuring reliable charging of both voltage sources through coordinated control of the switching elements.
2Productivity
If individual charging mode is used for the first and second voltage sources, then charging control is simplified, but charging efficiency and output performance are reduced
Solution Approach 1:
The charging system dynamically switches between individual charging mode and simultaneous charging mode based on charging requirements. The control unit adjusts the operating state of the first and second inverters in real-time, enabling the system to achieve high charging efficiency through simultaneous charging when needed, while maintaining manageable control complexity by using standardized switching element control procedures.
3Loss of time
If simultaneous charging of two voltage sources is implemented, then charging speed and productivity are improved, but control complexity increases
Solution Approach 1:
The control unit is pre-configured with charging control programs that define the switching patterns for simultaneous charging. By preparing the control logic in advance, the system can rapidly execute simultaneous charging operations without real-time decision complexity, thereby reducing charging time while keeping the control implementation manageable through predetermined switching sequences.
Data Source
AI summary
A charging system charges a first voltage source and a second voltage source through an external charger. The first voltage source and the second voltage source are capable of supplying electric power to a rotating electric machine that includes a coil group configured by multiphase coils. The charging system includes a first inverter, a second inverter, at least three switches, and a control unit. The first inverter includes a first switching element. The second inverter includes a second switching element. The control unit is capable of switching charging between individual charging in which either of the first voltage source and the second voltage source is charged, and simultaneous charging in which the first voltage source and the second voltage source are both simultaneously charged, by controlling operations of the first switching element, the second switching element, and the switches.