Inverter Module Triplet Configuration for EV Power Density
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Solution Overview
Problem
Existing power converter systems for electric vehicles face challenges in achieving a compact, high-performance design that balances cost, engineering flexibility, manufacturing, packaging, thermal design, and electrical design, often resulting in undesirable compromises that impact performance.
Innovation Solution
The development of an inverter module comprising three half-bridge modules arranged in a triplet configuration, with each module featuring a cold plate, ceramic layer, transistors, and a gel tray, which minimizes electrical parasitics, enhances cooling, and reduces component temperatures, allowing for a compact and efficient power conversion system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional power converter systems are used, then system simplicity is maintained, but electrical parasitics increase and power density decreases
Solution Approach 1:
The power converter system is divided into multiple independent half-bridge modules (first, second, and third half-bridge modules) that can be independently designed, manufactured, and assembled. Each module contains its own transistors, capacitors, and cooling structures, allowing for modular optimization that reduces electrical parasitics while maintaining system manageability through standardized interfaces and configurations.
2Power
If compact design is pursued, then power density increases, but thermal management becomes more challenging
Solution Approach 1:
Each half-bridge module is equipped with its own dedicated cold plate and cooling channels, providing localized thermal management tailored to the specific heat generation patterns of each module's transistors and power components. This distributed cooling approach ensures that hot spots are addressed at their source, maintaining low component temperatures even in compact configurations.
Solution Approach 2:
The cooling channels are integrated within and around the power components, with cold plates nested directly against transistor housings and capacitor mounts. This nested arrangement maximizes thermal contact area while minimizing the overall footprint, allowing efficient heat removal without increasing the external dimensions of the power converter system.
3Ease of manufacture
If mass production compatibility is achieved, then manufacturing cost decreases, but design flexibility is reduced
Solution Approach 1:
The half-bridge modules are designed with standardized interfaces, mounting configurations, and electrical connections that enable them to be used in various power converter applications and configurations. The modular design allows the same basic module architecture to be adapted for different power levels, voltage ratings, and application requirements, maintaining design flexibility while enabling standardized manufacturing processes.
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 achieves a compact design with low electrical parasitics, high current capacity, and low component temperatures, enabling high power density while being compatible for mass production and improving overall system performance.
Implementation Method 1
each module featuring a cold plate, ceramic layer, transistors, and a gel tray
Implementation Method 2
each module featuring a cold plate, ceramic layer, transistors, and a gel tray
Data Source
AI summary
Provided herein is a power converter component to power a drive unit of an electric vehicle drive system. The power converter component includes an inverter module formed having three half-bridge modules arranged in a triplet configuration for electric vehicle drive systems. Positive inputs, negative inputs, and output terminals of the different half-bridge inverter modules are aligned with each other. The inverter module includes a positive bus-bar coupled with the positive inputs and a negative bus-bar coupled with the negative inputs of the half-bridge inverter modules. The positive bus-bar is positioned adjacent to and parallel with the negative bus-bar. The inverter module can be coupled with a drive train unit of the electric vehicle and provide three phase voltages to the drive train unit. Each of the half bridge modules can generate a single phase voltage and three half-bridge modules arranged in a triplet configuration can provide three phase voltages.