Electric Power Conversion Device Overlapping Electrode Conductors
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Solution Overview
Problem
Existing electric power conversion devices face an increase in floating inductance at the electrical connecting portions between semiconductor elements and capacitors, which affects efficiency and performance.
Innovation Solution
The design includes a configuration where the element-side and capacitor-side electrode conductors are arranged such that their connecting surfaces overlap and extend parallel to each other, with protrusions and insulating sections to minimize floating inductance and facilitate bonding, while maintaining electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional connection methods are used between semiconductor elements and capacitor, then the structure is simple, but floating inductance increases
Solution Approach 1:
The patent transitions from planar connection to three-dimensional overlapping connection. The first and second electrode conductors extend in opposite directions from the semiconductor element, with their inner surfaces overlapping in the vertical dimension. This spatial arrangement creates a parallel plate capacitor structure that reduces inductance by providing multiple parallel current paths and minimizing loop area.
Solution Approach 2:
The patent merges the connection function with the capacitor structure itself. The overlapping electrode conductors form both the electrical connection and the capacitor's electrical field simultaneously. The insulating layer between the conductors serves dual purposes: electrical insulation and capacitor dielectric, eliminating the need for separate connection structures.
2Reliability
If electrode conductors are extended to reduce inductance, then floating inductance decreases, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layer is formed on the electrode conductors before the capacitor electrodes are attached to the semiconductor element. This preliminary formation of the insulating structure establishes the precise spacing and alignment references for subsequent assembly steps, making the overall manufacturing process more tolerant to variations.
Solution Approach 2:
The electrode conductors have different properties in different regions: the outer surfaces provide electrical connection with the semiconductor element, while the inner overlapping surfaces create the capacitor's electrical field. The insulating layer is selectively positioned only where needed between the overlapping conductors, optimizing both electrical performance and manufacturing feasibility.
Data Source
AI summary
An electric power conversion device includes an element-side first electrode conductor and an element-side second electrode conductor extending from a semiconductor element section toward one side in a first direction, and a capacitor-side first electrode conductor and a capacitor-side second electrode conductor extending from the capacitors toward the other side in the first direction, wherein a connecting surface of the element-side first electrode conductor and a connecting surface of the capacitor-side first electrode conductor overlap with each other and are electrically connected to each other, and a connecting surface of the element-side second electrode conductor and a connecting surface of the capacitor-side second electrode conductor overlap with each other and are electrically connected to each other.