Parallel Schottky-Bipolar Diode Circuit for Overcharge Withstand
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Solution Overview
Problem
Schottky diodes, despite being fast and having low forward voltage drop, are not able to withstand overcharges as well as bipolar diodes, limiting their application in electronic circuits.
Innovation Solution
Connecting a bipolar diode and a Schottky diode in parallel, with the bipolar diode comprising gallium nitride semiconductor layers and the Schottky diode using AlGaN, and forming cavities to connect the electrodes, allowing for improved voltage handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a Schottky diode is used, then the device operates fast with low forward voltage drop, but it cannot withstand overcharges as well as bipolar diodes
Solution Approach 1:
The patent combines a Schottky diode and a bipolar diode into a single integrated device structure. The Schottky diode portion provides fast switching and low forward voltage drop, while the bipolar diode portion provides superior overcharge withstand capability. Both diode types share common electrodes and are formed on the same semiconductor substrate, creating a unified component that delivers both performance characteristics simultaneously.
2Reliability
If a bipolar diode is used, then the device can withstand overcharges well, but it is slower and has higher forward voltage drop compared to Schottky diodes
Solution Approach 1:
The patent combines a Schottky diode and a bipolar diode into a single integrated device structure. The Schottky diode portion provides fast switching and low forward voltage drop, while the bipolar diode portion provides superior overcharge withstand capability. Both diode types share common electrodes and are formed on the same semiconductor substrate, creating a unified component that delivers both performance characteristics simultaneously.
3Reliability
If separate bipolar and Schottky diodes are used, then each diode type can perform its function well, but the device complexity increases
Solution Approach 1:
The patent combines a Schottky diode and a bipolar diode into a single integrated device structure. The Schottky diode portion provides fast switching and low forward voltage drop, while the bipolar diode portion provides superior overcharge withstand capability. Both diode types share common electrodes and are formed on the same semiconductor substrate, creating a unified component that delivers both performance characteristics simultaneously.
Solution Approach 2:
The integrated device structure serves multiple functions within a single component. The same electrode structure and semiconductor substrate support both Schottky and bipolar diode operations, allowing the device to function as both a fast-switching diode and an overcharge-protection diode simultaneously, eliminating the need for separate components.
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
The parallel connection of bipolar and Schottky diodes enhances the electronic device's ability to withstand overcharges, leveraging the strengths of both diode types while mitigating their individual limitations.
Implementation Method 1
Schottky diodes are diodes formed of a metal/semiconductor junction
Implementation Method 2
bipolar diode comprises the first semiconductor layer in contact with the second semiconductor layer, the second layer being of the conductivity type opposite to that of the first layer
Data Source
AI summary
The present description concerns an electronic device comprising a stack of a Schottky diode and of a bipolar diode, connected in parallel by a first electrode located in a first cavity and a second electrode located in a second cavity.