Power Semiconductor Gate Oscillation Suppression

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Solution Overview

Problem

Power semiconductor devices experience oscillation in gate signal waveforms immediately after turn-off switching, which can lead to erroneous operations and are not effectively suppressed by existing technologies.

Innovation Solution

A power semiconductor device design featuring semiconductor switching elements with protrusion portions on collector and emitter main terminals, where a signal line surrounds the entire circumference of these protrusions and is spaced apart, effectively suppressing gate signal waveform oscillation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional terminal design is used, then device structure is simple, but gate signal waveform oscillation occurs causing erroneous operation

Engineering Contradiction:

Improvegate signal waveform stabilityVSAvoidterminal structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The terminal structure is segmented into a body portion and a protrusion portion. The protrusion portion extends from the disposition surface toward the signal line, creating distinct functional zones that separate high-voltage terminals from signal lines, thereby suppressing oscillation while maintaining structural clarity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The terminal structure transitions from a planar arrangement to a three-dimensional configuration by adding protrusion portions that extend vertically from the disposition surface. This dimensional change allows the terminals to approach the signal line closer in the vertical direction while maintaining horizontal spacing, reducing oscillation without increasing planar complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If protrusion portions are added to terminals, then gate signal oscillation is suppressed, but manufacturing complexity increases

Engineering Contradiction:

Improveoperation stabilityVSAvoidterminal fabrication difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The protrusion portion is integrated with the terminal body as a single continuous structure rather than a separate component. This merging approach allows the protrusion to be formed simultaneously with the terminal during the same manufacturing process, avoiding additional fabrication steps while achieving oscillation suppression.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10186607B2Power semiconductor device including a semiconductor switching element

Publication Date: 2019.01.22 MITSUBISHI ELECTRIC CORP

AI summary

An object is to provide a technique that enables suppression of oscillation of a gate signal waveform. A power semiconductor device includes a power semiconductor chip, a plurality of collector main terminals and a plurality of emitter main terminals electrically connected to the power semiconductor chip, and a signal line. The plurality of collector main terminals and the plurality of emitter main terminals have protrusion portions which protrude from a disposition surface of the power semiconductor chip, respectively, and the signal line surrounds, with respect to these protrusion portions, an entire circumference of all the protrusion portions and is spaced apart therefrom in plan view.