📋 Case Study

Thermal Management System for EV Traction Inverter

Peak junction temps >175°C causing derating and reliability concerns

🏗️ Project Overview

High-power (250 kW) SiC inverter for premium electric SUV

🎯 Challenge

Peak junction temps >175°C causing derating and reliability concerns

🔧 Design Approach

Direct liquid-cooled cold plate with microchannel design + phase-change material (PCM) buffer layer

📐 Design Diagram

AI-generated project design illustration

📐 Key Calculations

Junction-to-Coolant Thermal Resistance

R_θJC = (T_j − T_coolant)/Q

Result: 0.12 K/W

Target threshold for SiC reliability

PCM Latent Buffer Capacity

m_pcm × h_fg

Result: 4.8 kJ over 60s transient

Absorbs surge during acceleration

📊 Results

Peak Tj reduced from 182°C to 151°C; 2× MTBF improvement; passed ISO 16750-4 thermal shock cycling

💡 Lessons Learned

• •Microchannel pressure drop must be co-optimized with pump power
• •PCM interface adhesion affects long-term thermal contact resistance

✅ Key Takeaways

• 1Microchannel pressure drop must be co-optimized with pump power
• 2PCM interface adhesion affects long-term thermal contact resistance