Segmented Gate Semiconductor Layout for Heat Concentration Control
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Solution Overview
Problem
Semiconductor devices face reduced withstand capacity due to current positive feedback caused by thermal resistance differences, leading to potential element breakdown, and existing solutions to alleviate heat concentration increase on-resistance and power loss.
Innovation Solution
A semiconductor device configuration with a semiconductor element and control circuit that generates a time difference in current cutoff between two cell regions, allowing pseudo thinning of cells to reduce temperature rise while maintaining low on-resistance, using a heat dissipation region with alternating first and second cell regions and a connection circuit that differentiates their conduction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cells are thinned out in a region outside the heat dissipation region to alleviate heat concentration, then heat concentration is reduced, but on-resistance increases and power loss increases
Solution Approach 1:
The cell region is divided into a first cell region and a second cell region with different structures. The first cell region has a standard structure while the second cell region has a modified structure with reduced cell density or different cell configuration. This segmentation allows different regions to have different characteristics, enabling heat dissipation optimization without significantly increasing overall on-resistance.
Solution Approach 2:
The patent applies local quality by creating distinct cell structures in different regions. The first cell region maintains standard cell density for low on-resistance, while the second cell region modifies cell density or structure to reduce heat concentration. This localized differentiation allows heat management without sacrificing overall electrical performance.
2Reliability
If multiple gate electrodes are used to control different cell regions, then current cutoff control is improved, but device complexity increases
Solution Approach 1:
The gate electrode structure is segmented into multiple independent gate electrodes (first gate electrode and second gate electrode), each controlling a specific cell region. This segmentation enables independent control of current cutoff in different regions, improving reliability by allowing selective shutdown of problematic regions while maintaining operation in healthy regions.
Solution Approach 2:
The control circuit acts as an intermediary that coordinates the multiple gate electrodes. It receives control signals and distributes appropriate voltages to the first and second gate electrodes, enabling sophisticated current cutoff control without requiring direct complex wiring between all control elements. This intermediary approach manages complexity while maintaining control functionality.
Data Source
AI summary
In a semiconductor device, a semiconductor element having a plurality of gate electrodes including a first gate electrode and a second gate electrode. An electrical connection member is electrically connected to a front surface electrode of the semiconductor element. A cell region of the semiconductor element includes a first cell region that allows a current to flow between the front surface electrode and a back surface electrode when the first gate electrode is applied with a voltage, and a second cell region that allows a current to flow between the front surface electrode and the back surface electrode when the second gate electrode is applied with a voltage. The semiconductor element and a control circuit are configured to generate a time difference in cutting off the current between the first cell region and the second cell region.