Integrated EV Power Conversion Circuit for Simultaneous Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing energy conversion systems in electric vehicles face inefficiencies due to the independent operation of battery charging and motor driving circuits, leading to excessive energy loss and limited applicability, as they require large-current contactors and cannot simultaneously drive the motor and charge batteries.
Innovation Solution
An energy conversion system incorporating a bridge arm conversion module, DC/DC conversion module, and control module that allows for simultaneous motor driving and battery charging by converting alternating current input voltage into bus voltage for both functions, eliminating the need for large-current contactors and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If large-current contactors are added to integrate battery charging circuit and motor driving circuit, then circuit integration is achieved, but energy loss increases excessively
Solution Approach 1:
The patent merges the battery charging circuit and motor driving circuit into a single integrated circuit structure. The charging pile connects to the battery pack through a single contactor that serves both charging and motor driving functions, eliminating the need for separate large-current contactors. This integration reduces the number of components while maintaining full functionality, and the single contactor experiences lower cumulative energy loss compared to multiple large-current contactors operating separately.
Solution Approach 2:
The contactor in the patent is designed with multi-functionality, serving both as a charging switch and a motor driving switch. This universal contactor can be controlled to route current for either battery charging or motor operation, or both simultaneously. By using one contactor for multiple purposes, the system avoids the energy losses associated with multiple high-current switching devices while achieving full circuit integration.
2Device complexity
If separate circuits are used for battery charging and motor driving, then circuit design is simplified, but applicability is limited and simultaneous operation is not possible
Solution Approach 1:
The patent combines separate battery charging and motor driving circuits into a unified integrated circuit. The charging pile connects to both the battery pack and motor through shared circuit paths and a single contactor. This merging enables simultaneous operation of charging and motor driving functions while maintaining relatively simple circuit design, thus improving applicability without significantly increasing design complexity.
Solution Approach 2:
The integrated circuit incorporates universal switching capability through the single contactor that can route power for different functions. The circuit is designed to handle multiple operational modes: battery charging only, motor driving only, or both simultaneously. This multi-functionality enhances adaptability and versatility while keeping the overall circuit structure manageable through shared components and control logic.
3Ease of operation
If multiple contactors are used to control charging and motor driving, then functional control is achieved, but circuit structure becomes complex and costs increase
Solution Approach 1:
The patent merges multiple contactors into a single contactor that handles both charging and motor driving control. This consolidation reduces the circuit structure from multiple separate switching devices to one integrated contactor, simplifying the overall circuit topology. The single contactor maintains full functional control capability by being able to switch for different functions based on control signals, thereby reducing structural complexity while preserving operational control.
4Adaptability or versatility
If large-current contactors are added for circuit integration, then battery charging and motor driving can be controlled, but manufacturing costs increase
Solution Approach 1:
The patent combines the functions of multiple large-current contactors into a single contactor, reducing the bill of materials and manufacturing costs. By integrating charging and motor driving control into one contactor, the system requires fewer high-current switching devices, lowering component costs and assembly complexity. This merging approach maintains full control capability for both functions while significantly reducing manufacturing expenses compared to using separate contactors for each function.
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 solution enhances energy conversion efficiency, reduces costs, and increases applicability by enabling simultaneous motor driving and battery charging without the need for large-current contactors, resulting in a more integrated and efficient power system.
Implementation Method 1
a bridge arm conversion module, a direct current (DC)/DC conversion module... to drive the motor based on an alternating current input voltage supplied by the power supply and form a bus voltage
Implementation Method 2
form a bus voltage at two ends of the bus capacitor
Implementation Method 3
control the DC/DC conversion module to charge the traction battery and the auxiliary battery based on the bus voltage
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This application provides an energy conversion system, an energy conversion method, and a power system. The energy conversion system may include a bridge arm conversion module, a direct current DC/DC conversion module, a motor, a bus capacitor, and a control module. The control module may be configured to control a bridge arm switch action in the bridge arm conversion module, to drive the motor based on an alternating current input voltage supplied by a power supply and form a bus voltage at two ends of the bus capacitor, and control the DC/DC conversion module to charge a traction battery and an auxiliary battery based on the bus voltage. In this application, the traction battery and the auxiliary battery can be charged while the motor is driven, thereby achieving higher energy conversion efficiency, low costs, and strong applicability.