 When utilized at low amplitude modulation indices, existing multilevel carrier-based PWM strategies have no special provisions for this operating region, and several levels of the inverter go unused. This paper proposes some novel multilevel PWM strategies to take advantage of the multiple levels in both a diode-clamped inverter and a cascaded Hbridges inverter by utilizing all of the levels ...

In this article, a fast and efficient open-circuit switch clamping diode fault diagnosis for neutral-point-clamped inverters is proposed. Multilevel converters employed in safety-critical applications should include fault-tolerant capability, where plays vital role. The proposed algorithm based on failure mode analysis, which logic-based approach. required signals measurements are available the...

In this paper, a new voltage controlled first order all-pass filter is presented. The proposed circuit employs a single differential voltage dual-X second generation current conveyor (DV-DXCCII) and a grounded capacitor only. The proposed all-pass filter provides both inverting and non inverting voltage-mode outputs from the same configuration simultaneously without any matching condition. Non-...

The stability of a piezoelectric structure controlled by digital vibration absorber emulating shunt circuit is investigated in this work. formalism feedback control theory used to demonstrate that systems with low electromechanical coupling are prone delay-induced instabilities entailed the sampling procedure unit. An explicit relation derived between effective factor and maximum period guarant...

Multilevel inverters are increasingly used in industrial applications which service continuity is crucial. This paper presents an original approach to ensure the fault-tolerant operation of neutral-point-clamped (NPC) case open-circuit fault event a clamping diode, rarely investigated conducted research work. The proposed strategy meets following criteria: restoring rated output voltage and cur...

A capillary plasma z-pinch as an alternative active medium of soft X-Ray lasers was studied experimentally and theoretically. The theoretical analysis was based on the self consistent solution of the so called “snow plow” model. The dynamics of pinched plasma is determined by the capillary parameters and by the time dependence of electrical current passing through it. The current time dependenc...

Multilevel inverters (MLIs) have seen significant growth in a variety of medium- to high-power industrial applications and become mature viable solution for renewable energy systems over the past decade. The major concerns MLIs are high component count buck-type feature ac output voltage when used grid-connected renewable-energy-based sources such as solar photovoltaic (PV) panels. As another o...

A new output structure for class E power amplifier (PA) is proposed in this paper. A series LC resonator circuit, tuned near the second harmonic of the operating frequency is added to the output circuit. This resonator causes low impedance at the second harmonic. The output circuit is designed to shape the switch voltage of the class E amplifier and lower the voltage stress of the transistor. T...