Power Converter Bus Bar for Even Current Distribution
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Solution Overview
Problem
In power converters with multiple modules connected in parallel, resistance differences between current paths can lead to uneven load distribution and increased likelihood of gate oscillation, which can result in faster deterioration and instability.
Innovation Solution
A power converter design featuring a bus bar configuration with connecting bus bar pieces that reduce resistance differences between power modules by connecting them in a way that minimizes internal inductance and ensures even current distribution, using a metal plate configuration with specific bus bar pieces and connecting pieces to link power modules in series and parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power modules are connected in parallel to increase current capacity, then the current capacity of the power converter is increased, but resistance differences between current paths cause uneven load distribution and gate oscillation
Solution Approach 1:
The bus bar is designed with multiple connecting pieces arranged symmetrically to create equipotential connections between parallel power modules. By connecting corresponding terminals (positive to positive, negative to negative) at equal electrical potentials, the invention eliminates potential differences that would otherwise cause uneven current distribution and gate oscillation, thereby maintaining reliable load distribution while achieving high current capacity.
2Power
If multiple power modules are connected in parallel, then the current capacity is increased, but gate oscillation occurs due to resistance differences
Solution Approach 1:
The bus bar structure connects parallel power modules at equal electrical potentials through symmetrically arranged connecting pieces. This equipotential connection eliminates voltage differences between modules that would cause gate oscillation, ensuring stable operation while maintaining increased current capacity from the parallel configuration.
3Device complexity
If a simple bus bar configuration is used to connect power modules, then the device complexity is reduced, but resistance differences cause uneven current distribution
Solution Approach 1:
The bus bar is segmented into multiple connecting pieces rather than using a single simple bar. Each connecting piece connects to specific terminals of power modules, and the segmented structure allows for optimized current distribution paths. This segmentation maintains relatively simple device complexity while achieving uniform current distribution through strategic arrangement of the connecting pieces.
Solution Approach 2:
The bus bar connecting pieces are arranged asymmetrically with respect to the power module positions, with specific pieces connecting to positive terminals and others to negative terminals. This asymmetric arrangement optimizes the current distribution paths to minimize resistance differences, achieving uniform current distribution without requiring excessive structural complexity.
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 design effectively reduces resistance differences and minimizes gate oscillation, ensuring more even load distribution and reduced parasitic inductance, thereby enhancing the stability and performance of the power converter.
Implementation Method 1
a bus bar connecting the four power modules... effectively reduces resistance differences and minimizes gate oscillation, ensuring more even load distribution and reduced parasitic inductance
Data Source
AI summary
A power converter may include four power modules and a bus bar connecting the four power modules, wherein the bus bar may include: a first bus bar piece connecting a negative terminal of a first power module and a positive terminal of a second power module adjacent to the first power module; a second bus bar piece connecting a negative terminal of a third power module and a positive terminal of a fourth power module adjacent to the third power module; and a plurality of connecting bus bar pieces connecting the first bus bar piece and the second bus bar piece. At least one of the connecting bus bar pieces may connect a center of the first bus bar piece and a center of the second bus bar piece.