SiC Power Module AMB Substrate for High-Frequency Thermal Control
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Solution Overview
Problem
Conventional power converter modules using silicon switching components are limited by low switching frequencies, resulting in large filtering components, high costs, and low efficiency, especially at high power densities.
Innovation Solution
The use of silicon carbide (SiC) components with an active metal braze (AMB) substrate featuring an aluminum nitride base layer and optimized conductive layers to reduce stray inductance and enhance thermal dissipation, allowing for high-frequency operation and improved power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If silicon switching components are used in power converter circuitry, then the module can operate reliably, but the switching frequency is limited and filtering components must be large
Solution Approach 1:
The patent changes the material parameter of the switching components from silicon to silicon carbide, which enables operation at higher switching frequencies (above 40 kHz) while reducing the size requirements for filtering components. This material parameter change directly resolves the contradiction by allowing both higher speed and smaller component volume.
2Volume of stationary object
If switching frequency is increased to reduce filtering component size, then volume decreases, but efficiency and power density decrease with silicon components
Solution Approach 1:
The patent changes the material parameter from silicon to silicon carbide switching components, which enables high-frequency operation (above 40 kHz) with reduced switching losses and maintained or improved efficiency. This resolves the contradiction by allowing volume reduction through frequency increase without suffering from the efficiency degradation that would occur with conventional silicon components.
3Temperature
If aluminum nitride base layer is used in AMB substrate, then thermal dissipation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses a composite AMB substrate structure with an aluminum nitride base layer, copper foil layers, and dielectric materials. This composite approach improves thermal dissipation through the high thermal conductivity of aluminum nitride while managing the manufacturing complexity through a structured multi-layer design that integrates various functional materials.
4Loss of energy
If conductive layer path length is minimized, then stray inductance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the geometric parameters of the conductive layers, minimizing path lengths between switching components to reduce stray inductance. The etched conductive layers are designed with specific trace widths and routing patterns that balance the need for low inductance with manufacturable dimensions, resolving the contradiction between performance and manufacturing precision.
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 enables power converter modules to operate at switching frequencies above 40 kHz with reduced switching losses, increased efficiency, and lower costs by minimizing the size and cost of filtering components, while maintaining structural integrity and thermal performance.
Implementation Method 1
The insulating base layer may have a minimum thermal conductivity of 30 W/m-K in order to provide low thermal resistance between the power converter circuitry and the second conductive layer
Data Source
AI summary
A power converter module includes an active metal braze (AMB) substrate, power converter circuitry, and a housing. The AMB substrate includes an aluminum nitride base layer, a first conductive layer on a first surface of the aluminum nitride base layer, and a second conductive layer on a second surface of the aluminum nitride base layer opposite the first surface. The power converter circuitry includes a number of silicon carbide switching components coupled to one another via the first conductive layer. The housing is over the power converter circuitry and the AMB substrate. By using an AMB substrate with an aluminum nitride base layer, the thermal dissipation characteristics of the power converter module may be substantially improved while maintaining the structural integrity of the power converter module.