Opposed-Current Semiconductor Module Layout for Low Inductance
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Solution Overview
Problem
In three-level inverter devices, the connection of power modules through wirings increases inductance, which can lead to surge voltage and potential damage to semiconductor elements.
Innovation Solution
A semiconductor module configuration that includes two modules connected such that their current paths are opposite to each other, canceling out magnetic fields and thereby suppressing inductance increase, with specific terminal and element arrangements to achieve this.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power modules are connected through wirings, then electrical connection is achieved, but inductance increases causing surge voltage
Solution Approach 1:
The patent merges multiple power modules into a single integrated semiconductor module with opposite current paths. The first and second power modules are combined such that their current paths flow in opposite directions, creating opposing magnetic fields that cancel each other out. This eliminates the need for external wirings and reduces overall inductance while maintaining electrical connection functionality.
Solution Approach 2:
The patent converts the harmful effect of magnetic fields into a beneficial cancellation effect. By designing opposite current paths in adjacent power modules, the magnetic fields generated by each module interfere destructively with each other, transforming the potential harmful inductance into a useful inductance-reduction mechanism that suppresses surge voltage.
2Power
If multiple power modules are connected in series, then voltage handling capability increases, but inductance and surge voltage risk increase
Solution Approach 1:
The patent introduces asymmetry in the current path configuration of series-connected power modules. Instead of identical current paths, the first and second power modules are designed with opposite current flow directions. This asymmetric arrangement creates opposing magnetic fields that cancel each other, allowing high voltage handling capability while suppressing surge voltage through magnetic field interference.
3Object-affected harmful factors
If modules are disposed to face each other with opposite current paths, then inductance is suppressed, but manufacturing complexity increases
Solution Approach 1:
The patent segments the semiconductor module into distinct first and second power modules, each with its own current path. This segmentation allows independent optimization of each module's current path direction, enabling the opposite current flow configuration that suppresses inductance. The modular segmentation also facilitates standardized manufacturing of individual modules that are then assembled in the opposite-facing configuration.
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 configuration effectively reduces inductance and surge voltage, minimizing the risk of failure or damage to semiconductor elements, while allowing for easier manufacturing and heat management.
Implementation Method 1
the direction of a current path in the first module is opposite to a direction of a current path in the second module
Data Source
AI summary
A semiconductor module includes a first module and a second module. The first module and the second module are connected to each other by connecting terminals thereof. The first module and the second module are disposed to face each other in a thickness direction of the first module, and a direction of a current path in the first module is opposite to a direction of a current path in the second module.