EV Inverter Module Triplet Segmentation for Thermal and EMI Management
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Solution Overview
Problem
Existing electric vehicle inverter modules face challenges in providing efficient three-phase power while managing heat dissipation and reducing electromagnetic interference (EMI) noise, often resulting in compromised performance and increased production costs.
Innovation Solution
A modular inverter module design comprising three power modules arranged in a triplet configuration, each including a capacitor, heat sink, ceramic plates, transistors, a laminated bus bar, and a gate drive printed circuit board, with a dielectric gel tray for insulation and a compact layout to enhance thermal management and reduce EMI noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a compact modular design with triplet configuration is used, then power density and manufacturing efficiency are improved, but heat dissipation management becomes more challenging
Solution Approach 1:
The inverter module is divided into three independent power modules (half-bridge modules) arranged in a triplet configuration. Each power module contains its own capacitor, heat sink, and transistor assembly, allowing independent thermal management while maintaining compact overall structure. This segmentation enables efficient heat dissipation from each module while achieving high power density at the system level.
2Object-affected harmful factors
If transistors are disposed in slots over ceramic plates, then EMI noise is reduced and thermal management is improved, but manufacturing complexity increases
Solution Approach 1:
The locator, ceramic plates, and transistor mounting structure are merged into a single integrated assembly. The locator with slots provides both mechanical support and electrical insulation, while the ceramic plates serve dual purposes as insulators and heat dissipation pathways. This merging reduces the number of separate components and simplifies manufacturing despite the sophisticated functional requirements.
3Ease of manufacture
If multiple components are integrated in a single power module, then production cost is reduced and assembly is simplified, but reliability may be compromised
Solution Approach 1:
The system is segmented into three independent power modules, each capable of functioning autonomously. This modular segmentation allows for simplified manufacturing and assembly of individual modules while maintaining system reliability through redundancy. If one module fails, the other two can continue to operate, preserving overall system functionality.
4Temperature
If heat sink is coupled directly with capacitor surface, then thermal management efficiency is improved, but electrical insulation requirements increase
Solution Approach 1:
The thermal management system uses composite construction where the heat sink is coupled to the capacitor through thermally conductive yet electrically insulating materials. The ceramic plates serve as intermediate layers that provide both electrical insulation and thermal pathways, allowing efficient heat dissipation while maintaining necessary electrical isolation between components.
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
The modular design provides efficient three-phase power, effective heat dissipation, and reduced EMI noise, achieving high power density and cost-effectiveness while allowing for easier manufacturing and maintenance.
Implementation Method 1
a heat sink coupled with a first surface of the capacitor
Implementation Method 2
a dielectric gel tray disposed over a first surface of the gate drive printed circuit board
Data Source
AI summary
Provided herein is an inverter module to power an electric vehicle. The inverter module can include a power module or multiple power modules. The power module can include a capacitor and a heat sink coupled with the capacitor. The power module can include a ceramic plate coupled with the heat sink. The power module can include a locator having a plurality of slots and a plurality of transistors disposed within the plurality of slots. The locator and the plurality of transistors can be disposed over a first surface of the ceramic plate. The power module can include a laminated bus bar disposed over a first surface of the locator. The power module can include a gate drive printed circuit board coupled with the laminated bus bar. The power module can include a dielectric gel tray disposed over a first surface of the gate drive printed circuit board.