Semiconductor Device With Opposing Current Paths
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Solution Overview
Problem
Semiconductor devices face reliability issues due to parasitic inductance, which generates induced voltages that can exceed the breakdown voltage of semiconductor elements during switching, leading to potential breakdown.
Innovation Solution
The semiconductor device design incorporates a configuration with opposing current directions in two circuit portions on a substrate, utilizing metal-oxide-semiconductor field-effect transistors (MOSFETs) and free-wheeling diodes, along with flat conductors and capacitors to cancel out magnetic flux and reduce parasitic inductance, ensuring that voltages do not exceed the breakdown limits of the elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interconnection structures are used in semiconductor devices, then device complexity is reduced and ease of manufacture is improved, but parasitic inductance increases causing induced voltages to exceed breakdown voltage of semiconductor elements
Solution Approach 1:
The patent merges two circuit portions with opposite current directions into a single semiconductor device structure. The first circuit portion carries current in one direction while the second circuit portion carries current in the opposite direction, causing their magnetic fluxes to cancel each other out. This combining approach reduces overall parasitic inductance without requiring external cancellation mechanisms.
Solution Approach 2:
The patent converts the harmful effect of parasitic inductance into a beneficial cancellation mechanism. By deliberately designing opposite current directions in adjacent circuit portions, the magnetic flux generated by each portion becomes a counteracting force against the other, transforming what would normally be harmful induced voltages into a self-cancelling system that reduces net parasitic inductance.
2Reliability
If circuit portions are arranged to cancel magnetic flux, then parasitic inductance is reduced, but device layout complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent segments the semiconductor device into distinct first and second circuit portions, each with clearly defined current paths and directions. This segmentation allows for systematic design of opposite current flows while maintaining clear manufacturing guidelines for each segment's layout and interconnection structures.
Solution Approach 2:
The patent employs asymmetric current direction design where adjacent circuit portions intentionally carry currents in opposite directions. This asymmetric arrangement is strategically implemented in the layout to achieve magnetic flux cancellation, with each circuit portion's geometry and current path optimized for its specific direction to simplify manufacturing while maintaining precision.
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 design effectively reduces parasitic inductance and induced voltages, enhancing the reliability of semiconductor devices by maintaining current equilibrium between circuit portions and preventing voltage-induced breakdowns.
Implementation Method 1
the direction of at least a portion of the current flowing in the first circuit portion is opposite the direction of at least a portion of the current flowing in the second circuit portion
Data Source
AI summary
According to one embodiment, a semiconductor device includes: a substrate; a first circuit portion; and a second circuit portion. The first circuit portion includes: a first and a second switching elements, and a first and a second diodes. The second circuit portion includes a third and a fourth switching elements, and a third and a fourth diodes. The first switching element is juxtaposed with the second switching element in a first direction, and is juxtaposed with the fourth switching element in a second direction. The third switching element is juxtaposed with the fourth switching element in the first direction, and is juxtaposed with the second switching element in the second direction. A voltage is applied to electrodes of the first and third switching elements. A voltage of a polarity opposite the first voltage is applied to electrodes of the second and fourth switching elements.