Layered Bus Bar Layout for Converter Oscillation Damping
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Solution Overview
Problem
High-power converter circuits using wide bandgap MOSFET devices experience undesired oscillatory effects and electromagnetic interference due to inductive and capacitive parasitic components in the bus system, leading to inefficiencies and potential voltage spikes.
Innovation Solution
A layered bus system with alternating insulative and conductive layers, where the conductive layers are composed of a first material with low resistivity and a second material with higher resistivity, is used to dampen oscillations and equalize capacitance across series-connected switching modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional bus system is used to interconnect switching modules, then the converter circuit can operate at high voltages and frequencies, but undesired oscillatory effects and electromagnetic interference are generated
Solution Approach 1:
The bus system employs a composite structure combining copper layers (for low resistivity and high conductivity) and aluminum oxide layers (for electrical insulation and mechanical support). This composite material approach allows the bus to simultaneously achieve low parasitic inductance through optimized copper geometry and effective oscillation damping through the resistive-aluminum oxide layers, resolving the contradiction between high power handling and electromagnetic interference generation
Solution Approach 2:
The invention modifies the physical and electrical parameters of the bus system by introducing a multi-layered structure with specific geometric configurations. The copper layers are designed with specific thicknesses and patterns to minimize inductance, while aluminum oxide layers are positioned and dimensioned to provide optimal damping. These parameter changes transform the bus from a simple conductor into an active oscillation-damping component that maintains high power capability while suppressing electromagnetic interference
2Adaptability or versatility
If wide bandgap MOSFET devices are used in switching modules, then operation in wider temperatures, voltages, and frequencies is achieved, but faster switching generates more severe oscillatory effects
Solution Approach 1:
The invention converts the inherently resistive nature of the aluminum oxide material, which would normally be seen as a loss mechanism, into a beneficial damping element. The resistive-aluminum oxide layers are strategically positioned to provide just enough resistance to dampen the high-frequency oscillations generated by fast wide bandgap MOSFET switching, while the overall bus design maintains low enough parasitic inductance to preserve the fast switching performance. This transforms the potential harm of resistance into the benefit of oscillation suppression
3Power
If series-connected switching modules are used to achieve high voltages, then voltage handling capability is increased, but capacitance imbalance between modules causes voltage distribution issues
Solution Approach 1:
The bus system design incorporates symmetric geometric configurations and balanced layer arrangements that create equipotential conditions across the series-connected switching modules. By carefully designing the copper and aluminum oxide layer geometries to be symmetric with respect to each module, the parasitic capacitances are equalized, ensuring uniform voltage distribution across all series-connected modules during high-voltage operation
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 solution effectively dampens high-voltage oscillations and controls capacitance, reducing voltage spikes and improving the efficiency and stability of high-power converter circuits.
Implementation Method 1
The layers of the conductive material each comprise a first material and a second material, the second material having a higher resistivity than the first material... effectively dampens high-voltage oscillations
Implementation Method 2
A geometry of the layers of the conductive material equalizes a capacitance across each of the first switching component and the second switching component
Data Source
AI summary
A system and method for high voltage oscillation damping and capacitance controlling is provided. The system includes a high-voltage circuit including a first switching component and a second switching component connected in series and a layered bus system in electrical communication with the high-voltage circuit. The layered bus system includes alternating bus bar layers of an electrically insulative material and bus bar layers of a conductive material. The layers of the conductive material each comprise a first material and a second material, the second material having a higher resistivity than the first material. A geometry of the layers of the conductive material equalizes a capacitance across each of the first switching component and the second switching component.