GaN Switch Circuit With Hybrid Diode for High Voltage Handling
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Solution Overview
Problem
Conventional power electronic transistors face limitations in handling high voltages and currents efficiently, particularly in switching times and on-resistance, with silicon-based devices being inadequate for advanced power applications, while silicon carbide and Group III-N semiconductor devices show promise but require innovative configurations to enhance performance.
Innovation Solution
A switch circuit and semiconductor device design incorporating a high-voltage Group III nitride-based transistor with a hybrid diode, where a depletion mode transistor is serially coupled with a diode in a cascode arrangement, providing a low forward voltage drop and low leakage current, and integrated with a silicon-based substrate to achieve improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon-based transistors are used for power electronic applications, then manufacturing maturity and ease of fabrication are maintained, but handling high voltages and currents efficiently is limited
Solution Approach 1:
The patent employs a hybrid structure combining Group III-N semiconductor material (such as GaN) for the high-voltage transistor channel with a silicon-based substrate. This composite approach leverages the superior electrical properties of Group III-N materials for high voltage and current handling while utilizing the mature manufacturing processes and mechanical stability of silicon substrates, thus resolving the contradiction between performance and manufacturability
2Productivity
If conventional silicon-based devices are used, then manufacturing processes are成熟 and cost-effective, but switching times are slow and on-resistance is high
Solution Approach 1:
The patent changes the fundamental material parameter from silicon to Group III-N semiconductor material for the transistor channel. This material substitution enables significantly faster switching times and lower on-resistance due to the superior electron mobility and breakdown characteristics of Group III-N materials, directly addressing the performance limitations of conventional silicon-based devices
3Reliability
If Group III-N semiconductor devices are used to carry large currents and support high voltages, then performance is improved, but device configuration complexity increases
Solution Approach 1:
The patent introduces a hybrid diode structure as an intermediary element, comprising a depletion mode transistor serially coupled with a diode in a cascode arrangement. This hybrid diode works in conjunction with the enhancement mode transistor to achieve bidirectional voltage blocking capability, simplifying the overall device configuration while maintaining high voltage and current handling performance
Data Source
AI summary
In an embodiment, a switch circuit includes an input drain node, an input source node and an input gate node, and a high voltage transistor having a current path coupled in parallel with a hybrid diode. The hybrid diode includes a depletion mode transistor serially coupled with a diode and operatively coupled in a cascode arrangement with the input source node.