SiC Semiconductor Module Parallel-Electrode Surge Reduction
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Solution Overview
Problem
High-speed switching in semiconductor devices made of silicon carbide (SiC) leads to increased surge voltage due to higher di/dt values, which can exceed the device's withstand voltage, potentially causing damage.
Innovation Solution
The semiconductor module employs a parallel-plate configuration for the first and second electrode plates to generate mutual inductance, reducing the inductance and thereby minimizing the surge voltage without compromising switching speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed switching is implemented in silicon carbide semiconductor devices, then switching speed is improved, but surge voltage increases due to higher di/dt values
Solution Approach 1:
The patent utilizes the harmful surge voltage generated by high-speed switching and converts it into a beneficial effect by introducing a capacitor connected between the collector and base of the transistor. This capacitor generates a compensating voltage that counteracts the surge voltage, effectively converting the harmful high di/dt into a useful voltage compensation mechanism that protects the device while maintaining high switching speed
2Device complexity
If conventional electrode plate arrangement is used, then device structure is simple, but inductance is high causing increased surge voltage
Solution Approach 1:
The patent changes the physical arrangement parameter of the electrode plates from a conventional configuration to a parallel-plate configuration. This parameter change in the geometric arrangement of the electrodes directly reduces the inductance value, thereby reducing the surge voltage generated during switching operations while maintaining structural simplicity
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 effectively reduces the surge voltage in the semiconductor module, ensuring it remains within the device's withstand voltage limits while maintaining high-speed switching capabilities.
Implementation Method 1
The flat plate portion of the first electrode plate and the flat plate portion of the second electrode plate are arranged in a parallel-plate configuration within the housing
Data Source
AI summary
A semiconductor module includes a base member including a circuit board on which a positive electrode pad and a negative electrode pad are provided and on which a semiconductor device is mounted to be electrically coupled to the positive electrode pad and the negative electrode pad, a housing that is attached to the base member so as to surround the positive electrode pad and the negative electrode pad, the housing being formed in a frame shape, a first electrode plate that is electrically coupled to the positive electrode pad, the first electrode plate having a flat plate portion, and a second electrode plate that is electrically coupled to the negative electrode pad, the second electrode plate having a flat plate portion. The flat plate portion of the first electrode plate and the flat plate portion of the second electrode plate are arranged in a parallel-plate configuration within the housing.