In our lives, ceramics are not only a work of art, but also a product of scientific and technological development. Driven by modern science and technology, special ceramics have changed from a simple ornament to an important material to promote social progress. As a professional custom processor of special ceramics, Junjie Ceramics will take you to explore this world full of mysteries. Materials such as silicon carbide (SiC) have a wide range of applications in industry due to their excellent physical properties, such as high hardness, high temperature stability, and electrical conductivity, especially in the manufacture of high-performance electronic components.
Today, let's talk about an important feature in SiC - the body diode. A body diode is a built-in part of a SiC power MOSFET (metal-oxide-semiconductor field-effect transistor) that acts as a bridge in power conversion, allowing current to flow smoothly.
A key metric is the body diode's reverse recovery time (TRR), which refers to the time it takes for the diode to return from the on-state to the non-conductive state without external excitation. The body diode of a SiC MOSFET reacts faster than a conventional silicon-based diode, which means that the current can be controlled more quickly.
PN junction diodes form naturally in SiC MOSFETs and are located between the drain (where current flows out) and the source (where current flows in). In some applications, such as motor control and inverters, this built-in body diode can be used as a freewheeling diode without the need for additional installation.
However, as with any technology product, SiC body diodes have their limitations. When we talk about "bipolar degradation", we mean that when the PN junction in the body diode conducts current, there are some problems due to specific material defects, such as the basal dislocation in the SiC crystal. These defects can cause impediments in the flow of current and may ultimately affect the performance of the device.
The good news is that bipolar degradation is not a problem that all SiC devices will encounter, and it depends on the specifics of the device. For devices that do not have these problems or have been specially processed to avoid them, performance can be stable.
So, how do you ensure the reliability of the SiC body diode?This requires us to perform various tests, such as the "power cycling test", to evaluate the reliability of the device over a long period of time by simulating various conditions encountered in the actual operation of the device.
Understanding and ensuring the reliability of SiC body diodes is critical to the application of these advanced devices in demanding power applications such as automotive, rail, and aerospace.
Therefore, when we are appreciating exquisite ceramic artworks, we should not forget the scientific principles and technology behind them, which are the most important force that drives our modern society forward. Junjie Ceramics always adheres to the technology-driven, quality-based, to provide customers with the best quality special ceramics custom processing services. We believe that scientific and technological innovation is an important force to promote social progress, and we are willing to contribute to this force.