GaN Circuit Assembly With Inlay PCB Thermal Management
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Solution Overview
Problem
Conventional GaN device assemblies face challenges with high thermal resistance due to low thermal conductivity of PCB materials, leading to increased heatsink size and cost, as well as high conduction losses and layout density limitations, which restrict power density and efficiency.
Innovation Solution
The use of an inlay PCB with a metal substrate and copper-filled vias reduces thermal resistance, combined with double-sided cooling and a separate gate-driver PCB to improve thermal performance and eliminate the need for a separate heatsink, while optimizing current routing and transformer integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional PCB materials are used for GaN device assemblies, then manufacturing is straightforward, but thermal resistance is high leading to larger heatsinks and increased cost
Solution Approach 1:
The patent employs a composite structure combining PCB material with high-thermal-conductivity fill material (such as aluminum nitride or boron nitride) to create an inlay PCB. This composite material maintains the ease of PCB manufacturing while dramatically improving thermal performance, resolving the contradiction between manufacturing simplicity and thermal resistance.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the PCB material by incorporating high-thermal-conductivity fill particles into the PCB composite. This parameter change enables the PCB to achieve both ease of manufacture and low thermal resistance simultaneously.
2Adaptability or versatility
If conventional PCB structures are used, then layout flexibility is maintained, but conduction losses are high and power density is limited
Solution Approach 1:
The patent applies local quality by placing high-thermal-conductivity fill material specifically in regions where heat dissipation is critical (underneath power devices and along current paths), while maintaining standard PCB materials in other areas. This localized approach reduces conduction losses without compromising overall layout flexibility.
Solution Approach 2:
The inlay PCB with composite materials provides both layout flexibility and reduced conduction losses by combining the electrical and mechanical properties of standard PCBs with the thermal conductivity of fill materials, enabling optimized current routing and heat dissipation simultaneously.
3Temperature
If separate heatsink is added to conventional GaN assemblies, then thermal performance improves, but device complexity and cost increase
Solution Approach 1:
The patent merges the heatsink function directly into the PCB structure by incorporating high-thermal-conductivity fill material within the PCB itself. This integration eliminates the need for separate heatsinks, reducing assembly complexity while maintaining improved thermal performance.
Solution Approach 2:
The inlay PCB serves multiple functions simultaneously: it provides mechanical support, electrical connection, and thermal management. By embedding thermal management capabilities within the PCB itself, the patent reduces overall device complexity while achieving superior thermal performance.
4Temperature
If larger heatsink is used to manage thermal resistance, then thermal performance improves, but power density and efficiency are reduced
Solution Approach 1:
The patent changes the thermal conductivity parameter of the PCB material through the incorporation of high-thermal-conductivity fill particles. This parameter change enables effective heat dissipation without requiring large heatsinks, thereby maintaining high power density and efficiency.
Solution Approach 2:
The composite material structure allows the PCB itself to function as an efficient heat sink, eliminating the need for additional thermal management components. This reduces the overall device volume and maintains high power density while achieving superior thermal performance.
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 significantly enhances thermal performance, reduces conduction losses, and achieves higher power density with simplified manufacturing, minimizing voltage spikes and improving reliability of GaN devices.
Implementation Method 1
The use of an inlay PCB with a metal substrate and copper-filled vias reduces thermal resistance
Implementation Method 2
combined with double-sided cooling and a separate gate-driver PCB to improve thermal performance
Data Source
AI summary
A circuit assembly includes a printed circuit board (PCB) with a metal inlay and an integrated metal substrate on a first side of the metal inlay, a switching device connected to a second side of the metal inlay opposite to the first side, and a thermal path between the switching device and the metal substrate via the metal inlay.