Abstract
Multilevel inverters have gained much attention for its operation involving applications ranging values of high power rating. This paper proposes a switching topology for asymmetric multilevel inverter utilizing less number of power electronics components. When the number of the output level increases, it requires more switching states and eventually the number of switching components. The increased number of switches results in higher switching losses which may lead to power loss, and reduction of efficiency of the overall conversion system. The salient feature of this proposed topology is that the module can be used as a sub multiple level structure and can be extended for any number of level with minimal increase in the switching components.
Highlights
In the field of Power Electronics major applications require power conversion either from ac to dc or vice versa
The functioning of multilevel inverters was introduced in the year 1975 [1] and three-level inverter concept was coined by Nabae et al [2], which involves linking multi dc voltage sources with semiconductor switches to form a staircase waveform to a near sinusoidal waveform
Apart from a two-level conventional inverter, the multilevel inverters can be utilized for several edge features like, reduced voltage stress in switches, less harmonic distortion in the output, operation both at frequencies of fundamental switching and high switching frequency PWM, reduced electromagnetic interference and high efficiency
Summary
In the field of Power Electronics major applications require power conversion either from ac to dc or vice versa. Less (Desirable) Moderate (Desirable) Too high (Undesirable) robust and can reduce the number of driver circuits of each reduced switch and the number of antiparallel diodes, if necessary This can result in making the circuitry modular, leading to a compact circuit and a good economy. In this paper such a new topology is proposed for both symmetrical and asymmetrical configuration with effort of reducing the number of the components used in the circuit. This configuration can be visualized as a sub multiple level structure utilizing only the positive output voltage with an aid of single H-Bridge circuiting for its functioning.
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