IGBT Short Circuit Capability via Edge Current Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-breakdown voltage semiconductor devices like lateral IGBTs, improving short circuit capability is incompatible with improving current capability, as it leads to uneven current distribution and potential element breakdown.
Innovation Solution
The semiconductor device design includes IGBTs with higher current capability at the extreme ends and lower current capability centrally, arranged in a linear symmetrical pattern, where the channel length and doping profiles are optimized to suppress self-heating and parasitic bipolar operation, thereby enhancing short circuit capability without compromising overall current capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overall current capability of the element is lowered to improve short circuit capability, then short circuit capability is improved, but overall current capability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the current capability of elements based on their position within the semiconductor device. Elements at extreme ends are designed with higher current capability than centrally located elements. This non-uniform distribution allows the device to handle short circuit conditions more effectively at vulnerable edge positions while maintaining adequate overall current capability through the contribution of multiple elements.
2Stability of the object's composition
If elements are arranged at regular intervals in a loopback manner to prevent current concentration, then stability of element characteristics is ensured, but short circuit capability deteriorates
Solution Approach 1:
The patent introduces asymmetry into the element arrangement by positioning elements at regular intervals in a linear fashion rather than in a symmetric loopback configuration. This asymmetric linear arrangement, combined with position-dependent current capability design, prevents current concentration while improving short circuit capability, particularly at the extreme ends of the device.
Data Source
AI summary
A semiconductor device in which short circuit capability can be improved while decline in overall current capability is suppressed. In the semiconductor device, a plurality of IGBTs (insulated gate bipolar transistors) arranged in a row in one direction over the main surface of a semiconductor substrate include an IGBT located at an extreme end in the one direction and an IGBT located more centrally than the IGBT located at the extreme end. The current capability of the IGBT located at the extreme end is higher than the current capability of the IGBT located centrally.