Dual-Gate IGBT Structure for Switching and Current Distribution Control
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Solution Overview
Problem
Current power semiconductor devices with IGBT configurations face challenges in optimizing switching behavior and charge carrier distribution, leading to inefficiencies in energy switching and saturation voltages, particularly due to the limitations of single-gate control mechanisms.
Innovation Solution
A power semiconductor device with a dual-gate configuration featuring distinct sections, each responsive to separate control signals, allowing for independent control of load current conduction through varying characteristic transfer curves, with the second section exhibiting a greater influence of the second control signal on inversion channels and load current changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-gate control mechanism is used in IGBT configuration, then the device structure is simple, but the switching behavior and charge carrier distribution cannot be optimized
Solution Approach 1:
The active region is divided into a first section and a second section, each with its own control electrodes. The first control electrodes control inversion channels in the first section, while the second control electrodes control inversion channels in the second section. This segmentation allows independent optimization of switching behavior in different regions, resolving the contradiction between control versatility and structural simplicity.
Solution Approach 2:
The patent transitions from a single-gate control dimension to a dual-gate control dimension by adding a second set of control electrodes that can independently modulate the inversion channels. This dimensional expansion enables simultaneous control of multiple parameters (switching behavior and charge carrier distribution) that were previously coupled in single-gate devices.
2Productivity
If dual-gate configuration with different sections is implemented, then switching efficiency is improved, but device complexity increases
Solution Approach 1:
The first section and second section are designed with different characteristics - the first section has a first characteristic transfer curve while the second section has a second characteristic transfer curve. Each section can be optimized for specific local requirements, allowing the device to achieve high switching efficiency through localized optimization rather than uniform design, thus improving productivity while managing complexity through functional differentiation.
3Measurement precision
If the second control signal strongly influences load current in both sections, then control precision is improved, but current distribution becomes unbalanced
Solution Approach 1:
The patent employs different characteristic transfer curves for the first and second sections, creating inherent differences in how each section responds to control signals. The first section exhibits a first characteristic transfer curve while the second section exhibits a second characteristic transfer curve, allowing each section to operate in its optimal parameter range. This parameter differentiation maintains control precision while ensuring balanced current distribution across sections.
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 dual-gate configuration enhances switching efficiency by allowing for more precise control of load current changes, reducing energy losses and improving saturation voltage management, thereby optimizing the performance of power semiconductor devices in applications like power converters and electric motors.
Implementation Method 1
the respective at least one of the first control electrodes is configured to induce an inversion channel for load current conduction in the associated semiconductor channel structure
Data Source
AI summary
A dual gate IGBT is presented, where the active region includes a first section and a second section. Both sections may be controlled by two control signals. For example, the first section exhibits a first characteristic transfer curve, load current in dependence of the voltage of the first control signal, and the second section exhibits a second characteristic transfer curve, load current in dependence of the voltage of the first control signal. At least the second characteristic transfer curves are changeable based on the voltage of the second control signal. For a given voltage of the first control signal corresponding to a forward-conduction-state of the power semiconductor device, the change of load current in the first section observed for a given change of the voltage of the second control signal is smaller as compared to the corresponding change of the load current in the second section.