A switched-capacitor-based dual-switch dc-dc converter with a high-boost voltage gain is proposed in this paper. The can obtain high-voltage small duty cycle, which decreases the stress and conduction loss on power switches. This paper presents key waveforms, operating principles at continuous mode discontinuous mode, parameter design. Moreover, comparison between other nonisolated converters has been completed. To verify principle, 200 W prototype constructed an input of 25-50 V output V....

This paper documents a new three-switch, isolated boost dc-dc converter. The major features of the proposed converter are as follows: 1) continuous input current; 2) reduced one active switch, additional diode, and capacitor; 3) unchanged primary secondary voltage waveforms transformer when duty cycle is changed; 4) removal snubber circuit. presents operating principles, analysis, parameter design guidelines, simulation results for To verify performance converter, 400 W prototype was...

In this paper, two switched-capacitor quasi-switched boost inverters (qSBIs) are proposed. By adding one capacitor and diode to the qSBIs, proposed achieve high voltage gain with low stress on active switches, capacitors, diodes. The can extend n-cell for improvement. operating principle, steady-state analysis, impedance parameter selections of inverter presented. A full comparison between other impedance-source is addressed. 500-W prototype built verify theory in both standalone mode...

Two high voltage gain quasi-switched boost inverters (HG-qSBIs) are introduced in this paper. The proposed HG-qSBIs has the following characteristics: 1) continuous input current with low ripple; 2) reduced stress on capacitor, switch, and diodes; 3) shoot-through immunity; 4) achieved single-stage conversion; 5) improve output capability using modulation index. A novel pulse-width modulationcontrol technique is for HG-qSBI. Operating principle, circuit analysis, passive component design...

In this paper, a modified three-phase two-level voltage source inverter is proposed. By combining the conventional H-bridge with switched-capacitor-voltage-doubler network, DC-link of proposed double respect to input DC voltage. As result, output can be higher than Furthermore, common-mode (CMV) reduced through controlling two additional switches based on space vector pulse-width modulation. Compared existing modulations and topologies, variation in CMV only up 16.6% stress across diodes...

Fault-tolerant methods have been recognized for improving the reliability of multiphase bidirectional dc–dc converters, including current-fed and voltage-fed dual active bridge converters. research converters has caught much attention recently. In this article, a new fault-tolerant method (CF-DAB) with blocking capacitors is proposed. The operation CF-DAB converter when an open-circuit fault occurs comprehensively presented analyzed. A frozen-phase additional on both sides transformer aim...

In grid-connected photovoltaic (PV) systems, a transformer is needed to achieve the galvanic isolation and voltage ratio transformations. Nevertheless, these traditional configurations of transformers increase weight, size, cost inverter while decreasing efficiency power density. The transformerless topologies have become good solution. However, problem that commode-mode leakage current can occur via stray capacitors between PV array ground inverter. Various inverters been introduced with...

High-voltage gain conversion is necessary for several applications, especially low voltage renewable source applications. In order to achieve a high-voltage gain, the presented paper proposes class of transformerless DC-DC converters based on three switched-capacitor networks. The proposed have following characteristics: reduced stress capacitors and power devices; obtained high with small duty cycle; conduction losses in switches. To verify operation principle converters, detailed analysis...

Low voltage stress on the impedance source network devices is main reason for advent of DC-linked type quasi-switched boost inverters (DqSBIs). However, DqSBI has become less attractive due to its low gain. This paper presents a novel PWM control strategy and comparative performance evaluation conventional inverters. The modified based improves gain reduces conduction loss inductor current ripple. Circuit analysis comparison study between DqSBI, quasi-Z-source inverters, two-stage inverter...

In a single-stage buck-boost quasi-switched boost inverter (qSBI), the shoot-through state insertion causes high amplitude common-mode voltage. Consequently, qSBI becomes less attractive in transformerless photovoltaic (PV) systems. this paper, novel space vector pulse-width modulation for modified is introduced to reduce magnitude of voltage and push index up 1. By properly choosing interval time, states are considered be inserted boosting also reducing THD value output The mathematical...

This article introduces a new switched-capacitor-based multilevel inverter topology. The proposed structure consists of six switches with single dc voltage source and three floating capacitors, it is capable producing six-level output waveform boosting gain 2.5. Moreover, the voltages capacitors are constructively balanced because they directly charged to fixed by input source. operating principles, circuit description, pulsewidth modulation control technique for topology presented, along...

In this article, a novel single-stage transformerless buck–boost inverter is introduced. The proposed can share common ground between the DC input side and grid; leads to having zero-leakage current. also provides buck boost voltage capabilities. Additionally, power switches are operated at high frequency in half-cycle of sinusoidal wave, so efficiency be improved. Operating analysis, design consideration, comparison, simulation study presented. Finally, 500 W laboratory prototype built...

In this study, an improved pulse width modulation (PWM) scheme was proposed for active quasi-Z source inverter (AqZSI). Compared to the quasi-Z-source (qZSI), AqZSI with PWM strategy can operate in a wide range of input voltage higher efficiency. Furthermore, index, lower inductor current stress, and reduced shoot-through current. A procedure flowchart is presented optimal selection duty cycle, switching ratio additional switch, index AqZSI. Moreover, some comparative results between AqZSI,...

This paper introduces a new three-phase two-level inverter based on the switched-capacitor voltage multiplier. By adding multiplier network at DC side of traditional topology, DC-link introduced is stepped up to triple input voltage. Compared existing solutions, common-mode topology kept constant. Moreover, stress across additional semiconductor components same as one-third Operating principles, mathematical analysis, circuit and pulse-width modulation (PWM) method Boolean logic function for...

This paper proposes a new isolated high step-down DC-DC converter based on the phase-shift full-bridge converter. The proposed has some properties very suitable for applications including ratio, low transformer turns voltage stress power switches, wide soft-switching range, and no saturation problem. These attractive features are achieved by simple pulse-width modulation control method unique split-capacitor structure input side. By structure, both switching decreased significantly. As...

A new switched-boost four-leg inverter is proposed in this article. By using two power switches the network as fourth leg, achieves constant common-mode voltage; thus, leakage current effectively mitigated. The reliability and boosting voltage of can be ensured by shoot-through state insertion. operating principle, mathematical analysis, control method, comparative study are presented. Finally, simulation experimental results have been performed on a 1.2-kW prototype inverter.

In practice, the input filter is an important component in matrix converter (MC) systems for removing high harmonic components from currents. Due to filter, power factor (IPF) at main supply does not always achieve unity. To investigate behavior of IPF, this paper analyzes IPF compensation capacity MCs with LC based on space vector theory and conservation energy law. The study shows that range voltage transfer ratio (VTR) unity depends strongly quality factor, which determined by system...

An active-clamped current-fed half-bridge DC-DC converter with three switches is proposed in this paper. The characteristics of the have following as input current continuous low ripple; decreasing one active switch; and achieving wide range zero-voltage switching (ZVS) on two switches. Which leads to high efficiency, reduce size cost. operating principles parameters selection are discussed. A 250 W prototype PI controller built validate converter.

In this article, a new single-phase five-level current-source inverter is proposed. The proposed provides open/short-circuit immunity and minimizes overlap time by adding four small film capacitors, thus enhancing the inverter's reliability. efficiency output waveforms quality are improved due to reduced overlap-time interval. also natural balancing of inductor currents. addition, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</i>...

In this article, a quasi-switched boost converter based on the switched-capacitor technique with high step-up voltage capability is dealt and analyzed. The proposed offers simple structure low stress semiconductor elements intrinsic small duty cycle. An inductor of connected in series input source; therefore, continuous current ripple attainable. addition, efficiency also improved. A detailed steady-state analysis discussed to identify salient features switched-capacitor-based DC-DC...

This paper presents some comparative results between the three-phase quasi-Z source inverter (qZSI)and active (AqZSI). An improved PWM method is proposed for AqZSI. The voltage gain can be increased by using shoot-through duty cycle and switching ratio of additional switch. Compared to qZSI, AqZSI with strategy has a higher efficiency at boost mode. Furthermore, operated up modulation index it boasts lower inductor current ripple reduced current. analysis are discussed. experimental...

The main advantage of DC-linked type quasi-switched boost inverter is the low voltage stress on impedance-source network devices when compared with quasi-Z-source (qZSI). In this paper, a cascaded multilevel (DqSB-CMI) proposed. This paper further addresses detailed modeling and control issues DqSBI-CMI used for grid-tied applications. proposed system can solve imbalance problem DClink power between different modules, providing desired to grid. Simulation experimental results are presented...

Recently, renewable energy resources have been connected to the power system reduce carbon emissions worldwide [...]

This article presents a three-phase two-level impedance-source inverter to decrease the magnitude of common-mode voltage and enhance output capability. Shoot-through states are inserted into zero ensure for boosting improving quality with higher modulation index. Moreover, advantage proposed solution is as low stress on capacitors, switches diodes in network. The theoretical analysis, circuit logic functions introduced. A comparison between other topologies reduction also reported. Besides...

The DC-link type quasi-switched boost inverters (DCL-qSBIs) are known as one of impedance-source with low voltage stress on their additional switch, diode, and capacitor. However, the gain DCL-qSBIs is still low. This paper presents a modified PWM control strategy. strategy based improve gain, reduce conduction loss, decrease devices in switched-boost network. operating principle presented. 1 kVA-prototype three-phase DCL-qSBI quasi-Z-source inverter (qZSI) built to evaluate performance at...