IGBT Module Reflux Diode Layout for Reverse Surge Resistance
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Solution Overview
Problem
Existing semiconductor modules with IGBTs and reflux diodes have limited reverse surge resistance due to the forward breakdown voltage of the reflux diode, which limits the module's ability to handle reverse surge currents without breaking down.
Innovation Solution
The semiconductor module includes an IGBT and a reflux diode with a forward threshold voltage less than the reverse withstand voltage of the IGBT and a forward breakdown voltage exceeding the reverse withstand voltage, allowing both devices to handle reverse surge currents without the reflux diode breaking down.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional reflux diode is used in the semiconductor module, then the module can handle normal operating currents, but the reverse surge resistance is limited by the forward breakdown voltage of the reflux diode
Solution Approach 1:
The patent changes the voltage parameters of the reflux diode by selecting a diode with a forward breakdown voltage higher than the reverse withstand voltage of the IGBT. This parameter selection allows the reflux diode to withstand reverse surge voltages without breaking down, thereby improving the reverse surge resistance of the semiconductor module while maintaining normal operating functionality
2Reliability
If the forward breakdown voltage of the reflux diode is increased to improve reverse surge resistance, then the reverse surge resistance improves, but the device complexity increases
Solution Approach 1:
The patent makes the reflux diode serve multiple functions: it continues to provide its traditional function of conducting reverse currents during normal operation, and simultaneously provides reverse surge protection by withstanding high reverse surge voltages without breaking down. This multi-functionality is achieved by selecting a reflux diode with appropriately high forward breakdown voltage, eliminating the need for additional protection circuits and reducing overall device 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
This configuration enhances the reverse surge resistance of the semiconductor module by distributing the surge current across both devices, preventing the reflux diode from breaking down and ensuring the IGBT operates within safe voltage limits.
Implementation Method 1
a reflux diode which is anti-parallel connected to the IGBT... the reverse surge current bypasses the IGBT and flows into a reflux diode as a forward surge current
Data Source
AI summary
The semiconductor module includes a first device that has an IGBT and a second device that has a reflux diode which is anti-parallel connected to the IGBT, which has a forward threshold voltage less than a reverse withstand voltage of the IGBT, and which has a forward breakdown voltage in excess of the reverse withstand voltage of the IGBT.