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Bidirectional AC/DC power conversion has become very essential for any power electronic based industry. Pulse Width Modulated (PWM) Converters can be suggested as the best solution for rectifier as well as inverter modes of operation to achieve bidirectional power flow. In rectifier mode of operation, the converters are controlled to deliver regulated and ripple free DC output with high quality of...
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...
The explicit features of wide band gap devices such as silicon carbide (SiC) and gallium nitride (GaN) propelled the relentless demand for higher power density and higher efficiency in enormous power-electronic applications. SiC-based power switches are adopted in solar inverter, electric traction and other automotive electrical subsystems due to their admirable characteristics compared with silicon...
A discontinuous pulse width modulation (DPWM) strategy for variable load power factor (PF) with capacitor voltage unbalance control in a three level neutral point clamped (NPC) traction inverter drive for electric vehicles (EVs) is developed and presented in this paper. It is shown that the addition of an appropriate offset signal with the reference DPWM signals generates compensating neutral current...
The aim of this paper is to evaluate experimentally the switching characteristics of discrete high voltage Super-Junction (SJ) MOSFET in the 650VDSS voltage class with respect to device package. The switching performance of the SJ MOSFET is evaluated in four different SMD packages, of which two with Kelvin source, each with respect to a soft recovery freewheeling diode, its own intrinsic body diode...
Low frequency switching of voltage source inverters generates low order harmonic voltages in the output causing torque and speed ripple. In this paper, a multilevel space vector diagram formed by nine-concentric octadecagons (polygons with 18 sides) using a single DC source is presented which eliminates lower order harmonics till seventeenth order from the phase voltage output over the entire modulation...
Phase Shifted Full Bridge (PSFB) converters are widely accepted for high and medium power DC-DC conversion. These converters have features such as ZVS operation and reduced EMI operations, which leads to higher efficiency. In the traditional power loss calculation methods, only the fundamental component of switching frequency is considered. This paper describes more detailed power loss analysis of...
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