RC-IGBT Gate Control for Lower Reverse Recovery Loss
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Solution Overview
Problem
Conventional methods for controlling reverse-conducting insulated-gate bipolar transistors (RC-IGBTs) require detection or estimation of operation states, making it difficult to implement effective control.
Innovation Solution
The semiconductor device includes a first and second switching device connected in series, each with a transistor region and a diode region in anti-parallel configuration. The transistor region is controlled by a first gate signal, and the diode region is controlled by a diode gate signal, allowing for reduced reverse recovery loss by controlling the diode gates during reverse recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional control methods are used for RC-IGBT, then the device can operate, but state detection or estimation is required making control difficult
Solution Approach 1:
The semiconductor device is segmented into distinct transistor regions and diode regions, each with independent gate control. This segmentation allows the diode region to be controlled separately from the transistor region, enabling direct control of reverse recovery without needing to detect or estimate the overall device state.
Solution Approach 2:
A diode gate is introduced as an intermediary control element between the control circuit and the diode region. This diode gate signal directly controls the diode region's conduction state, eliminating the need for complex state detection and estimation that would otherwise be required.
2Loss of energy
If diode gates are controlled by gate signal during reverse recovery, then reverse recovery loss is reduced, but device structure becomes more complex
Solution Approach 1:
The diode region and transistor region are merged into a single semiconductor device structure with integrated gates. The diode gate and transistor gate are structurally integrated but functionally independent, allowing separate control of the diode region to reduce reverse recovery loss while maintaining a unified device architecture.
Solution Approach 2:
The semiconductor device structure is designed to perform multiple functions: the diode region handles reverse conduction and reverse recovery, while the transistor region handles forward conduction. Both regions share the same semiconductor substrate and can be controlled independently through their respective gates, enabling the device to optimize performance across different operating modes.
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 configuration eliminates the need for state detection, simplifying control and reducing reverse recovery loss in the semiconductor device.
Implementation Method 1
the diode region includes a diode gate controlled by a diode gate signal... control for turning ON the diode gates in preparing the reverse recovery of the diode region reduces an amount of injected holes in the diode region
Data Source
AI summary
Provided is a semiconductor device that is easily controlled. The semiconductor device includes a first switching device and a second switching device that are connected in series between a first potential and a second potential lower than the first potential, wherein each of the first and second switching devices includes a transistor region, and a diode region electrically connected in anti-parallel to the transistor region, the transistor region includes a first gate controlled by a first gate signal, and the diode region includes a diode gate controlled by a diode gate signal.