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High-voltage high-power pulse switches are built with semiconductor devices, preferably thyristor, due to the superior performance that they offer. Triggering methods classify the thyristor as electrically triggered thyristor (ETT) and light triggered thyristor (LTT). Due to the specialized gate constructions and many build-in protections, the cost of LTT is much higher than ETT. The operating modes...
Wide band gap devices offer significant advantages such as high power density, fast switching and high efficiency. It is important to understand the trade-off involved in switching loss, conduction loss and reverse conduction characteristics for power converter design. Switching characterisation is essential for understanding the behaviour of new enhancement mode Gallium Nitride (GaN) power transistors...
Insulated gate bipolar transistors (IGBT) have evolved significantly and become exceedingly fast. Today, their typical switching speeds are of the order of 100ns. The resulting dv/dt is considerably large and when employed in a variable speed motor drive inverter, ringing over-voltages occur at the motor terminals even with cable as short as 1 meter in length. In any such power converter system, protection...
Usage of power converters in a vast variety of equipments from cellphones, laptops to automobiles, aeroplanes and satellites is increasing. Different synchronous buck converter configurations are considered in this work using Silicon (Si) devices and Gallium Nitride (GaN) devices of equal current ratings. The performance of these converters in terms of power losses and overall efficiency are compared...
The effect of non-idealities of a high frequency class D amplifier on it's output voltage is analysed. Firstly individual non-idealities like dead time, MOSFET body-diode drop, MOSFET ON-State drop, finite turn-on and turn-off time, series resistance of inductor and capacitor of output stage filter are taken one at a time and their effect on output voltage is analysed. Then effect of all of these...
Primary side flyback PWM controllers are available with large number of protection features such as over current protection, over/ under input voltage protection, over output voltage protection etc., and designs using such controllers can be cost effective. They are designed for flyback dc-dc converters for low power CV-CC applications like LED lighting and mobile/PDA battery chargers. Using this...
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