3D Power Conversion Module Layout for Low-Inductance Switching
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Solution Overview
Problem
Conventional power conversion modules face challenges in reducing parasitic inductance and achieving high-frequency switching due to the limitations of traditional two-dimensional transistor mounting configurations, which restrict the operational frequency and efficiency of power transistors.
Innovation Solution
The implementation of a three-dimensional (3D) integration technique using printed circuit boards (PCBs) and thermal substrates to stack high side and low side transistors, with decoupling capacitors and thermal management systems, reduces parasitic inductance and enables efficient heat dissipation, allowing transistors to operate at higher frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional two-dimensional transistor mounting configuration is used, then device structure is simple, but parasitic inductance is high and switching frequency is limited
Solution Approach 1:
The patent transitions from traditional two-dimensional planar mounting to three-dimensional vertical stacking of transistors and circuit components. Multiple transistor layers are stacked vertically with interconnect structures connecting different layers, enabling reduced current path length and parasitic inductance while achieving higher switching frequencies without excessive complexity increase
2Reliability
If three-dimensional integration is implemented, then parasitic inductance is reduced and switching frequency increases, but device structure and manufacturing complexity increase
Solution Approach 1:
The power conversion module is divided into multiple functional layers including first and second transistor layers, driver circuits, and interconnect structures. Each layer performs specific functions and can be independently optimized, allowing complex 3D integration to be managed through modular segmentation that improves reliability while controlling manufacturing complexity
Solution Approach 2:
Multiple transistor layers and circuit components are nested vertically within a compact three-dimensional structure. The first and second transistors are stacked with one positioned above the other, connected through vertical interconnects, creating a nested configuration that reduces parasitic inductance by minimizing current loop area while maintaining functional integrity
3Productivity
If high-frequency switching is achieved, then power conversion efficiency improves, but heat generation increases requiring advanced thermal management
Solution Approach 1:
Thermal management is addressed by transitioning to three-dimensional heat dissipation pathways. Heat sinks and thermal management structures are integrated in the vertical dimension, providing enhanced heat removal capacity that matches the increased power density from high-frequency switching operation
Data Source
AI summary
A power conversion module and method of forming the same includes a motherboard having a first surface and a second surface that opposes the first surface. The motherboard includes a first trace that electrically couples a decoupling capacitor mounted on the motherboard to a first pad on the first surface of the motherboard and an output node of a power conversion module. The motherboard includes a via extending through the motherboard that electrically couples a second pad on the first surface of the motherboard and a third pad on the second surface of the motherboard to the output node and a second trace that electrically couples a fourth pad on the second surface of the motherboard and the decoupling capacitor. The power module includes a first daughterboard mounted on the first surface of the motherboard and a second daughterboard mounted on the second surface of the motherboard.