Power Conversion Device Inductance Reduction via Opposing Modules
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Solution Overview
Problem
Conventional power conversion devices for electric vehicles face challenges in reducing inductance, which leads to increased component count, size, and complexity due to the need for an inductive conductor to manage surge voltages, complicating the structure and increasing costs.
Innovation Solution
A power conversion device design featuring a simple structure with plate-shaped semiconductor modules, where positive and negative modules are oppositely disposed with large opposing surfaces, and currents flow in opposite directions through intermediate bus bars, reducing mutual inductance without the need for an inductive conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an inductive conductor is added to reduce inductance, then inductance reduction is achieved, but device complexity and component count increase
Solution Approach 1:
The patent utilizes the surge voltage generated by switching element operation as a beneficial resource. By configuring semiconductor modules with opposite current directions, the surge voltage naturally induces currents that counteract inductance effects, eliminating the need for separate inductive conductors and simplifying the overall structure.
Solution Approach 2:
The patent merges the functions of current conduction and inductance reduction into the same semiconductor module structure. The module bodies serve both as current paths and as generators of counter-inductive effects through their opposing configurations, consolidating multiple functions into unified components.
2Object-affected harmful factors
If an inductive conductor is added to reduce inductance, then inductance reduction is achieved, but device size increases
Solution Approach 1:
The patent converts the inherent surge voltage from switching operations into a useful counter-inductive effect. This eliminates the need for additional inductive conductors that would occupy space, thereby reducing overall device volume while maintaining inductance reduction.
3Object-affected harmful factors
If an inductive conductor is added to reduce inductance, then inductance reduction is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the inductance reduction function with the existing semiconductor module structure. By configuring modules with opposite current directions and using their body sections as active elements, the design eliminates separate inductive conductor components, thereby simplifying assembly and manufacturing processes.
4Object-affected harmful factors
If a complicated structure is used to facilitate induced current flow, then inductance reduction is achieved, but device complexity increases
Solution Approach 1:
The patent leverages the natural surge voltage generated during switching operations to create beneficial induced currents. The module configurations automatically generate these currents without requiring complex facilitation structures, as the opposite current directions and adjacent positioning naturally enable the desired electromagnetic interaction.
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 effectively reduces inductance while maintaining a compact and efficient design, enhancing heat dissipation and simplifying the current path, thus eliminating the requirement for an inductive conductor and reducing overall complexity.
Implementation Method 1
when the current flows to the semiconductor module, an induced current flows to the inductive conductor in the direction opposite to that of the current flowing to the semiconductor module
Data Source
AI summary
The power conversion device includes a plurality of semiconductor modules, each having a main body section including a switching element therein. In a module unit, a positive module and a negative module are disposed such that main surfaces of the respective main body sections oppose each other. A positive terminal, a first intermediate terminal, a negative terminal, and a second intermediate terminal project in a Z direction perpendicular to X direction in which the positive module and the negative module oppose each other. A first vector V1 from the positive terminal towards the first intermediate terminal and a second vector V2 from the second intermediate terminal towards the negative terminal are configured such that these vector components V12 and V22 in a Y direction perpendicular to both the X and Z directions are opposite to each other.