GaN Diode Circuit Merging Transistor and Diode for Low Forward Voltage
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Solution Overview
Problem
Existing diode circuits face challenges in achieving low forward voltage and low parasitic resistances in the forward direction while maintaining high blocking voltage resistance in the reverse direction.
Innovation Solution
A diode circuit is designed using a normally on transistor and a diode, where the drain contact of the transistor is connected to the outer cathode contact, and the gate contact of the transistor is connected to the anode contact of the diode, allowing independent optimization for low forward voltages and low parasitic resistances with high blocking voltage capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transistor is used to control current flow, then the device can be switched on and off, but it has undesirable on-state series resistance and limited dielectric strength
Solution Approach 1:
The patent combines a normally-on transistor and a diode into a single integrated circuit structure where the transistor provides high blocking voltage capability and the diode provides low forward voltage and low parasitic resistance, achieving both high reliability and low energy loss simultaneously
2Loss of energy
If a diode is used for rectification, then it provides good forward conduction, but it lacks the switching control capability of transistors
Solution Approach 1:
The circuit merges the diode's excellent forward conduction properties with the transistor's switching control capability, creating a device that maintains low forward voltage drop while enabling controlled on/off operation through the transistor's gate terminal
3Reliability
If separate diode and transistor components are used, then each can be optimized independently, but the overall device complexity increases
Solution Approach 1:
The patent integrates the diode and transistor into a single unified circuit structure with shared terminals and interconnected components, maintaining independent optimization of each component while reducing overall device complexity through functional integration
Solution Approach 2:
The integrated circuit structure serves multiple functions simultaneously - the transistor provides both switching control and high voltage blocking, while the diode provides forward conduction and reverse blocking, creating a multi-functional component that reduces system complexity
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 circuit effectively emulates a diode with low forward voltage and high reverse voltage resistance, enabling efficient operation in switched-mode applications with improved performance in both forward and reverse directions.
Implementation Method 1
a two-dimensional electron sea 7 (2DEG) is formed at an interface between an AlGaN layer 4 and a GaN layer 5
Implementation Method 2
A gate electrode 2G can be produced by a Schottky contact, via which the transistor can be controlled by applying a voltage
Implementation Method 3
Diodes can be based, for example, on silicon semiconductors or also on AlGaN/GaN semiconductor systems
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a diode circuit comprising a normally on transistor (12) and a diode (13), which realizes the advantages of a transistor in the reverse direction and the advantages of a diode in the forward direction.