Multilayered Thermal Coating for Power Electronics Heat Dissipation

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Solution Overview

Problem

Existing power electronics face challenges in thermal management, leading to potential damage or reduced lifespan due to inadequate heat dissipation.

Innovation Solution

A multilayered thermal coating process is applied to power electronics boards, utilizing copper layers with chromium adhesion promoters and electroless deposition techniques to enhance heat spreading and dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If power electronics components are densely packed to increase productivity, then productivity is improved, but thermal management becomes inadequate leading to component damage and reduced reliability

Engineering Contradiction:

Improvepower electronics densificationVSAvoidcomponent lifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies a multilayered composite coating structure consisting of a nonpolar electrical insulation layer (e.g., Parylene), a chromium adhesion promoter layer, and a copper thermal management layer. This composite structure enables the PCB surface to simultaneously provide electrical insulation, strong adhesion, and high thermal conductivity, resolving the contradiction between densification and thermal management without compromising reliability

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional thermal management methods are used, then manufacturing simplicity is maintained, but thermal resistance remains high causing excessive temperature increases

Engineering Contradiction:

Improvecoating process simplicityVSAvoidthermal resistance

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent fundamentally changes the thermal parameter of the PCB surface by depositing a copper layer with high thermal conductivity (k ≥ 200 W/m·K, preferably k ≥ 400 W/m·K). This parameter change reduces thermal resistance from typical values of 10-100 K/W to much lower values, enabling effective heat spreading while maintaining manufacturing feasibility through established deposition techniques

Inventive Principle:

Principle #35Parameter changes

3Temperature

If copper layers are applied directly to PCB surfaces for thermal management, then thermal conductivity is improved, but electrical insulation is compromised leading to short circuits

Engineering Contradiction:

Improveheat dissipationVSAvoidelectrical insulation

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent segments the functional requirements into distinct layers: the bottom nonpolar electrical insulation layer (e.g., Parylene with thickness 1-10 μm) provides electrical isolation, while the top copper layer provides thermal management. This segmentation allows each layer to perform its specific function without interfering with the other, eliminating the risk of electrical short circuits while maintaining effective heat dissipation

Inventive Principle:

Principle #1Segmentation

4Strength

If multilayered coatings with adhesion promoters are applied, then coating adhesion is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecoating adhesionVSAvoidcoating process steps

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The chromium layer serves as an intermediary between the nonpolar electrical insulation layer and the copper layer. It provides strong adhesion to the nonpolar surface through chemical bonding, while also offering a suitable substrate for copper deposition. This intermediary layer ensures robust coating adhesion and reliable thermal management, with the added benefit that chromium's reflective properties can enhance the overall thermal performance of the coating system

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The multilayered thermal coating significantly reduces thermal resistance and temperature increases in power components, improving their operational lifespan and efficiency.

Implementation Method 1

a chromium and copper layers are deposited on the nonpolar electrical insulation layer

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

utilizing copper layers with chromium adhesion promoters and electroless deposition techniques to enhance heat spreading and dissipation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

electroless deposition techniques to enhance heat spreading and dissipation

Methodology Applied

Scientific EffectElectroless deposition: Electrodeposition

Data Source

PatentUS12342449B2Multilayered nonpolar, chromium, copper material coatings of power electronics boards for thermal management

Publication Date: 2025.06.24 THE BOARD OF TRUSTEES OF THE UNIV OF ILLINOIS

AI summary

An apparatus includes a printed circuit board (PCB), a power component disposed on the PCB, the power component to generate heat, and a multilayered coating disposed over the power component and at least a portion of the PCB to dissipate heat from the power component, the multilayered including: an electrical insulation layer comprising a non-polar compound and disposed on the power component and the at least a portion of the PCB; a chromium layer disposed on the electrical insulation layer; and a copper layer disposed on the chromium layer that is at least 10 microns (μm) thick, the copper layer conformally adhered to a top of the power component and to the PCB.