Bidirectional Charger Circuit Topology for Motor-Driven Systems
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Solution Overview
Problem
Existing motor-driven systems for new energy vehicles have complex structures and high costs due to the use of components like carbon brushes or wireless transformers, which compromise reliability and increase expenses while aiming for high efficiency, low costs, and small size.
Innovation Solution
A motor-driven system incorporating a bidirectional charger with a power factor correction circuit, voltage conversion circuits, and a transformer, along with an excitation drive component connected via a multiplexing node and switch units, implements time division multiplexing to simplify the circuit structure, reduce weight and size, and minimize thermal energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a carbon brush structure or wireless transformer is used to drive the excitation generator, then the motor system can achieve high efficiency and wide-range speed control, but the structure becomes complex and costs increase
Solution Approach 1:
The patent merges the charging circuit and excitation drive circuit into a single integrated system. The bidirectional charger's voltage conversion circuits serve dual purposes: charging the electricity storage unit and driving the excitation generator. This eliminates the need for separate drive components like carbon brushes or wireless transformers, thereby simplifying the overall structure while maintaining functionality.
Solution Approach 2:
The voltage conversion circuits in the bidirectional charger are designed to perform multiple functions. During charging mode, they convert voltage for the electricity storage unit. During motor drive mode, they provide excitation current to the excitation generator. This multi-functionality removes the need for dedicated excitation drive components, reducing structural complexity.
2Adaptability or versatility
If separate voltage conversion circuits and drive control circuits are disposed between the electricity storage unit and drive component, then the excitation generator can be driven, but the structure becomes complex and costs increase
Solution Approach 1:
The patent combines the charging circuit and excitation drive circuit into one integrated bidirectional charger. The same voltage conversion circuits and control circuits are used for both charging the electricity storage unit and providing excitation to the generator, eliminating redundant components and simplifying the circuit structure while maintaining full adaptability for speed control.
Solution Approach 2:
The bidirectional charger's voltage conversion circuits are designed to operate in multiple modes: charging mode for the electricity storage unit and excitation mode for the generator. This universal design allows a single circuit system to perform multiple functions, reducing overall complexity while preserving the ability to achieve wide-range speed control.
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 configuration simplifies the motor-driven system, reduces costs, and enhances the vehicle's endurance by integrating a partial circuit of the bidirectional charger to meet the excitation generator's requirements, thereby improving reliability and mileage.
Implementation Method 1
a first transformer, where a first terminal of the first transformer is electrically connected to the second terminal of the first voltage conversion circuit
Data Source
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AI summary
This application relates to the field of vehicle control technologies, and provides a motor-driven system and a vehicle, to simplify a structure of the motor-driven system and reduce costs. The motor-driven system includes: a bidirectional charger, an excitation drive component, and a motor controller. The bidirectional charger includes: a power factor correction circuit, a first voltage conversion circuit, a first transformer, and a second voltage conversion circuit. An electricity storage unit is electrically connected to a second terminal of the second voltage conversion circuit. The excitation drive component is electrically connected to a multiplexing node by using a first switch unit, the multiplexing node is located between the power factor correction circuit and the first voltage conversion circuit, and the excitation drive component is configured to drive an excitation generator.