1. Define the IGBT Heat Load
Start with switching and conduction losses under realistic operating conditions. Obtain junction temperature limits, module drawings, mounting instructions and thermal data from the semiconductor manufacturer.
Continuous and transient power loss.
Module and diode heat-source locations.
Maximum coolant inlet temperature.
Available flow and pressure drop.
Electrical isolation and environmental conditions.
2. Route Coolant Under the Critical Heat Sources
Tube routing should reflect the heat map rather than simply fill the available plate area. A serpentine path may suit distributed loads, but concentrated heat sources can require a different geometry. In series flow, coolant gradually warms along the route.
A custom liquid cooling plate can be manufactured with tailored tube routing, plate dimensions and mounting holes for a specific power module.
3. Control the Thermal Interface
The interface between the IGBT baseplate and the Cold Plate is critical. Use the thermal interface material and application method recommended by the module manufacturer. Surface flatness, cleanliness and mounting pressure can strongly affect resistance.
4. Follow Correct Mounting Practices
Use the specified screw pattern, tightening sequence and torque. Excessive torque can deform the assembly; insufficient torque may leave air gaps. Consider differential thermal expansion between the module and aluminum plate.
| Integration factor | Review item |
|---|---|
| Mounting holes | Match module drawing and tolerances |
| Surface flatness | Meet module contact requirements |
| Thermal interface | Control coverage and thickness |
| Fasteners | Use approved torque sequence |
| Coolant fittings | Avoid hose stress on the assembly |
| Electrical safety | Confirm isolation and creepage requirements |
5. Verify Coolant Flow and Pressure Drop
Check the pump operating point with the complete loop connected. For multiple cold plates in parallel, evaluate branch flow balance. For series arrangements, account for coolant warming between components.
6. Validate the Prototype
Measure inlet and outlet coolant temperatures.
Measure cold plate pressure drop at multiple flows.
Check temperatures near the highest-loss module regions.
Estimate junction temperature from validated device data.
Perform leak and pressure testing before electrical operation.
Repeat under worst-case ambient and peak power.
Conclusion
Successful IGBT cold plate integration combines thermal modeling, mechanical contact, coolant hydraulics and physical testing. Design all four together to avoid localized overheating.
Frequently Asked Questions
Can I bolt an IGBT directly to an aluminum cold plate?
Only when the module manufacturer’s electrical isolation and interface requirements are satisfied.
Does higher flow always solve hot spots?
No. Poor contact and unsuitable tube routing may remain limiting factors.
What should I send for a custom design?
Module drawings, loss map, coolant details, temperature limits and mounting constraints.
Need a Custom Liquid Cold Plate?
KINGKA offers configurable tube-based Liquid Cold Plates for industrial electronics. Share your drawings, heat load, coolant and installation requirements to discuss a suitable manufacturing solution.
Explore KINGKA Tube Liquid Cold Plates