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A kind of LLC resonant converter with voltage-doubling rectifier technology is studied in this paper. The converter has not only a general LLC half-bridge resonant converter being easy to obtain ZVS for primary side switches and ZCS for secondary side diodes, a high efficiency of this topology, but also advantages that the transformer structure is simple in which one winding is involved on its secondary...
In this paper, a high gain boost converter based on the voltage-lift technique is proposed. The converter is composed of basic quasi-Z-source cell and a voltage-lift cell which contains one capacitor, two inductors and diodes. Contrasted with the traditional quasi-Z-source DC/DC converter, a relatively high voltage conversion and the reduction of the input current ripple can be achieved with the presented...
Traditional Z-source inverter can boost or buck voltage for its unique impedance network, but also has its own drawbacks, such as input current is not continuous, boost capacity is limited, the capacitor voltage stress is large and etc. In order to overcome the shortcomings of the traditional Z-source inverter, a series of Z-source inverters are proposed. In this paper, the topology of three kinds...
A novel quadratic buck-boost DC/DC converter is presented in this study. The proposed converter utilizes only one active switch and can step-up/down the input voltage, while the existing single switch quadratic buck/boost converters can only work in step-up or step-down mode. First, the proposed converter is analyzed in steady-state. Then, its performance is validated using simulations in MATLAB/Simulink...
Output voltage of renewable energy resources, such as fuel and solar cells, varies widely with load and environmental condition, so a DC-DC converter should be suitable for wide input-voltage range application and be with low input ripple current. An integrated boost three-phase half-bridge converter is proposed. The boost and three-phase half-bridge converters are integrated to reduce number of switches...
Single-stage buck-boost gird-connected inverter is widely used in distributed generation systems because of low cost and high efficiency. However, shoot-through problem exists, so reliability of the system is reduced. In addition, output voltage of renewable energy resources varies widely with load and environmental condition, so voltage stress of switches is high in wide input-voltage range application...
This paper presents a single-stage non-isolated modified multiplier SEPIC converter for high voltage gain. The modified and multiplier technique reported in the literature are used to conventional SEPIC converters to obtain high voltage gain and low voltage stress across the switch. The proposed topology combines merits of both of these techniques simultaneously in the SEPIC converter to evolve a...
In This paper we are presenting a bidirectional DC-DC converter is also known as dual active bridge (DAB) dc-dc converter. We presented a Z-source with bidirectional dc-dc converter by reducing the switching count by adding the passive elements we are improving the output voltage level, Comparing with the traditional bidirectional dc-dc converter, the proposed converter has an wider regulation range...
Cascaded multilevel inverters are widely used in various fields, from oil and gas, power supply installations, to power quality devices. While there are many advantages of the cascaded multilevel inverter such as low voltage stress for each switching device and higher power quality, the main downside for this type of inverter is relatively large number of switching device it needs in an installation...
In this paper a 2 MW dc-dc converter is presented and design criteria are carried out. It deals with the preliminary design for the hardware implementation. The power supply shall have multiple targets such as an PV emulator or supply for a dc-micro grid in the research facility National Center for Reliable Electric Power Transmission of the University of Arkansas. The converter is designed for an...
This paper presents a novel generalized topology of a multilevel inverter. The proposed topology is obtained by extending the developed H-bridge topology. The proposed topology is competent to generate the optimum number of output voltage levels by using minimum number of dc voltage sources. The topology offers reduced value of voltage stress on semiconductor power switches. Utilization of dc voltage...
In this paper, an overall comparison between the Quadratic Boost Converter (QBC) & Cascaded Converter or Cascaded Boost Converter (CBC) is given in terms of ideal condition, as well as with the consideration of Equivalent Series Resistance (ESR) of inductor-capacitor. The differences in the voltage gain due to the individual effect of inductive and capacitive ESR is shown in this paper. The parameters...
This paper presents an performance improvement of neutral-point balancing using DC/DC converter. The proposed energy storage system (ESS) is composed of AC/DC three-level converter and DC/DC three-level converter. The conventional neutral-point control method is balanced by adding a duty-offset to the duty of the switches. But this paper is proposed adding additional neutral-point controller using...
In this paper a high step-up interleaved boost converter is proposed for renewable energy applications. The proposed converter uses multi-phase/interleaving technique with two coupled inductors in one phase and an intermediate capacitor between the two phases. The idea is such that the coupled inductors are used to develop a high voltage across the intermediate capacitor and then this high voltage...
A novel single-phase soft-switching AC/AC converter using a simple auxiliary resonant unit and a small AC capacitor is proposed. All main switching devices operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The advantages of this topology are found in efficiency improvement, reduced the voltage stresses, and greatly reduced...
This paper proposes an improved push-pull forward (PPF) three-level (TL) converter. The proposed converter can operate in three-level and two-level modes. The flying capacitor can be removed by the proposed control. Four switches sustain only half of the input voltage, which can be clamped by the input divided capacitors. The others sustain one and a half of the input voltage in three-level mode and...
This paper researches a modified single-phase power-factor-correction (PFC) AC-DC buck-boost converter, which is operated in discontinuous conduction mode (DCM) by using a simple control scheme to achieve almost unity power factor, low total harmonic distortion of input current (THDi), and step-up/down DC output voltage for universal input voltage applications. This converter has low voltage stresses...
In this paper, a two-phase interleaved boost converter with low switch voltage stress and automatic current-sharing capability is proposed for single-phase power factor correction (PFC). First, a forward-type converter is integrated with the first phase to achieve much higher voltage conversion ratio and avoid operating at extreme duty ratio. Then, two capacitors are added as voltage dividers for...
Different parallel transmission lines can be utilized when there is a power flow from a surplus generation area to a load centre in a meshed power grid. The current distribution in these lines depends on the inverse value of the line impedances. The current path with the lowest impedance will reach its maximum transmission capacity considerably earlier than the other parallel paths. It thus determines...
In this paper we propose a set of different configurations of failure recovery schemes, developed for network-on-chip (NoC) based systems. These configurations exploit the fact that communication in NoCs tends to be partitioned and eventually localized. The failure recovery approach is based on checkpoint and rollback and is aimed towards fast recovery from system or application level failures. The...
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