EV Drive Power Module Reuse for Compact Battery Charging
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Solution Overview
Problem
Existing electric vehicle drive systems face challenges in reducing volume and improving energy efficiency due to the presence of high-power inductors and direct current conversion modules, which hinder space savings and endurance mileage.
Innovation Solution
The system reuses components from the generator rectifier circuit and motor drive circuit, including bridge arms and bus capacitors, to form parallel connections with a power module, allowing for efficient energy conversion and storage across different drive modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bidirectional direct current conversion module is added to support charging/discharging of power battery, then charging/discharging function is improved, but system volume increases and energy efficiency deteriorates
Solution Approach 1:
The power module with bridge arms is designed to perform multiple functions: it serves as both the direct current conversion module for battery charging/discharging and as part of the motor drive circuit. By making the power module universal, the patent eliminates the need for separate dedicated modules, thereby reducing system volume while maintaining charging/discharging functionality.
Solution Approach 2:
The patent merges the power module (with bridge arms) into both the motor drive circuit and the generator rectifier circuit. This consolidation integrates multiple functions into a single shared component structure, reducing the overall system volume by eliminating redundant components that would otherwise be needed for separate charging/discharging operations.
2Power
If high-power inductor and direct current conversion module are used, then power conversion capability is improved, but system volume increases
Solution Approach 1:
The power module is merged into the motor drive circuit and generator rectifier circuit, allowing the same bridge arms to handle high-power conversion for both motor control and battery charging/discharging. This eliminates the need for separate high-power inductors and direct current conversion modules, reducing system volume while maintaining power conversion capability.
Solution Approach 2:
The bridge arms in the power module are designed to universally handle high-power conversion tasks across different operating modes (motor drive, generator rectification, battery charging, and discharging). This multi-functional design eliminates redundant high-power components, achieving high power capability without proportional volume increase.
3Adaptability or versatility
If separate direct current conversion module is added, then battery management capability is improved, but energy efficiency deteriorates
Solution Approach 1:
The power module is merged into the existing motor drive and generator rectifier circuits, allowing battery charging and discharging to utilize the same efficient power conversion hardware. This eliminates energy losses associated with separate direct current conversion modules while maintaining comprehensive battery management capability through integrated control.
Solution Approach 2:
The bridge arms serve multiple functions including motor control, generator rectification, and battery charging/discharging. By using the same efficient power conversion path for all these functions, the system maintains high energy efficiency across all operating modes while providing comprehensive battery management capability.
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 approach reduces the system's volume, enhances energy efficiency, and improves applicability by enabling various drive modes such as brake regenerative, pure electric, and hybrid driving, optimizing power usage and battery charging/discharging.
Implementation Method 1
the generator rectifier circuit runs in a rectifier mode to supply power to the motor drive circuit
Implementation Method 2
the motor drive circuit runs in an inverter mode to output a three-phase current to the drive motor
Implementation Method 3
the power module includes a bus capacitor and a first bridge arm, two ends of the first bridge arm are respectively configured to connect to two ends of the bus capacitor
Data Source
AI summary
This application provides an electric vehicle drive system. The drive system includes at least one of a generator rectifier circuit and a motor drive circuit, and a power module. In the power module, a midpoint of a first bridge arm is configured to connect to a power battery, while it's two ends are respectively configured to connect to two ends of a bus capacitor. Two ends of the second bridge arms in the generator rectifier circuit are respectively configured to connect to the two ends of the bus capacitor, while the midpoints are separately configured to connect to a generator. Two ends of the third bridge arms in the motor drive circuit are respectively configured to connect to the two ends of the bus capacitor, while the midpoints are separately configured to connect to a drive motor. This application reduces a volume of the drive system.