12/15/2023 0 Comments Power mosfetsTake Infineon for example, they target their commercial power MOSFETs at the following applications :īattery powered applications, i.e. In the low voltage category, besides automotive MOSFETs that form the main focus of this chapter, other power MOSFETs are designed for a range of other applications. There are various catalogs of MOSFETs available in the market the technology used is mainly categorized into the following three types: planar, trench and superjunction. As aforementioned, the power MOSFET accounts for a significant portion of the total revenue. Overview of the power MOSFET market segmentsĪccording to the QYResearch Group, the global revenue for the discrete power device market in 2016 was valued at $ 7.277 billion, and by the end of 2022 this number was projected to rise to $ 9.135 billion, growing at a compound annual growth rate of slightly above 3.86% between 20. Electron irradiation or platinum doping may also be used for minority carrier lifetime control in the body diode to greatly improve the reverse recovery characteristics.ġ.3. Unclamped inductive switching (UIS) is so-called without support of a separate freewheeling diode, and ruggedness is the ability of the MOSFET to resist avalanche failure under UIS conditions. However, in some applications, for instance gasoline or diesel injection, MOSFETs are designed with an intrinsic body diode to withstand this possible voltage surge in order to survive any avalanche breakdown threat. Placing a freewheeling diode anti-parallel to the MOSFET represents one approach to avoid this possible high voltage dump. Thus, when dealing with inductive loads in ECUs, a high di/dt commutation rate during switching transitions runs the risk of a surge voltage that may destroy the device. When the supply current is rapidly switched off, the changing magnetic field inside the windings induces a back electromotive force. It can be seen that instantaneous current changes could result from a short circuit in the arm of the H-bridge, a short circuit to the ground or a short circuit to the three-phase motor. Īlmost every application circuit has some kind of inductance, not only in the form of load inductance such as solenoids or electric motors, but stray inductances such as wiring and layout inductances.įigure 2 shows a typical application circuit in an electric power steering system. Notably, power MOSFETs are able to switch high current and voltage levels with enhanced power handling capability in highly efficient power supply circuits and systems. Owing to their high input impedance and energy efficiency excellence in high frequency applications, MOSFETs are the preferred choice to several circuit designers. Specifically, power metal-oxide-semiconductor field-effect transistors (MOSFETs) have gained a lot of popularity due to their simple drive requirements, low on-resistance and fast switching properties. The latter we refer especially to those power semiconductor devices that are widely recognized as basic and vital building blocks of electrical and power electronic systems.ĭiscrete power semiconductors occupy a major share of the ever-increasing revenue from semiconductor devices in the HEV/EV industry over the years, and this is projected to continue beyond 2020 ( Figure 1). If ECUs are akin to the organs of the car, semiconductor devices are like the cells. In certain high-end vehicles, the number of ECUs can be as high as 100 or so. Particularly, more and more electronic control units (ECUs) have been developed for automobiles and electric vehicles. These features are inevitably empowered by advances in electrical engineering and automation, bringing about the rapid increase in the value of electronics in a car. More recently, driverless cars have become a reality. Over the years of continual development of the automobile, more and more “bells and whistles” were added, culminating in more innovative features and functions. When the first automobiles were invented dating back to 130 years ago, the only expectations were safe operation and durability.
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