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The boost inverter is an attractive solution for photovoltaic (PV) microinverters since it is a single stage architecture. Indeed, in comparison, most of the microinverters topologies consist of two-stage structures, a DC-DC converter for voltage elevation and an inverter for grid connection, resulting in a lower efficiency. The boost inverter consists of two DC-DC boost converters connected in differential...
This paper proposes a modified quadratic boost converter with high efficiency and reduced cost. This converter mainly comprises of the quadratic part. The newly proposed converter in this paper is compared with a quasi z source converter which is a quadratic boost converter. The current ripples, cost, efficiency, losses and the complexity of the converters are considered. The steady state analysis...
In this paper, a reversible multilevel nine-leg converter for three-phase applications is investigated. This topology can be applied in line voltage regulator, power factor correction (PFC) and uninterrupted power supplies (UPS). It is composed of three single-phase three-leg converters with a leg shared by both load and grid sides. Suitable modelling, a pulse-width modulation (PWM) strategy based...
This paper presents a control strategy for a brushless DC motor (BLDCM) drive with a new converter topology. The new topology is based on the conventional voltage-fed inverter, but includes an additional source such as a capacitor or a battery, and requires connection to the BLDCM neutral. The objective of the proposed control strategy is to control the otherwise unregulated voltage across the additional...
In this paper a capacitor voltage filtering scheme for a cascaded H-bridge (CHB) multilevel converter based STATCOM is proposed. The scheme is based on an analytic formula derived from the system model in order to cancel out the low frequency ripple of the capacitors voltages. The scheme remains effective even under high magnitude voltage ripple which would be present when lower capacitance film capacitors...
One problem with a single-voltage source, three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral...
DC link voltage balancing is very important for the reliable operation of H-bridge cascade power regulation system (PRS). This paper proposes a novel method to balance the three-phase DC link voltage for the star-connected cascade PRS, which is based on the negative sequence voltage injection. The algorithm is analyzed and the performance is compared with the method based on zero sequence voltage...
Domestic induction heating is a well-consolidated technology that is evolving in order to obtain new products combining three key aspects: performance, efficiency, and cost. New development tendencies suggest the use of multi-inductor architectures to improve the user performance. These systems require the development of new power converters adapted to the new architectures to achieve an efficient...
This paper presents a flyback inverter using voltage sensorless maximum power point tracking (MPPT) for AC module systems. In conventional MPPT technique, a PV voltage and PV current are required to calculate the PV output power for the MPPT operation. A proposed method only used for the PV current detection sensor to perform MPPT. When the PV current is sensed, proposed method calculates the electric...
A nonlinear control buck converter with fast transient response is presented. Methods and principles are analyzed. In the proposed control scheme, the idea of integration is applied and the variable which relates to input voltage and duty ratio is introduced to be compared with the integration variable. The simulations for this design are implemented and simulation results show that fast load and...
This paper deals with the control of the output part of a power electronics converter, which we have designed for a diesel-electric power supply unit for military applications. The output part of the unit is composed of a four-leg three-phase voltage source inverter and a sinusoidal filter. The output part of the power supply unit with help of proposed control system allows to create three-phase symmetrical...
The paper is concerned with new resonant converter configurations, belonging to the previously published dual channel dc-dc converter family. On one hand, the new configurations solve a significant shortcoming of the original ones, namely, the output midpoint potential was floating in comparison with the input midpoint. This caused a high-frequency oscillation of the output midpoint, often significantly...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
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