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This paper presents a soft switching technique to improve the efficiency of isolated and non-isolated power converters in the high-frequency range. The designed converter uses two switches i.e. main switch and auxiliary switch which are operated in Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) respectively. Here, different circuit modes of ZVS PWM buck converter with the proposed ZCS...
A reliable modular dc-dc converter that is well-suited to the MVDC grid applications is proposed in this paper. This converter benefits from zero current turn-off and soft turn-on switching; hence, it can use naturally commutated switches such as silicon-controlled rectifiers (SCR). SCRs offer numerous advantages over other types of switches, among them are simple control, long lifetime, low losses,...
This paper proposes a new soft-switched High Step-up DC-DC converter for energy storage systems in DC traction vehicles. In this converter, soft-switching operation, i.e., zero current switching has been obtained by employing dual resonant auxiliary circuits to the conventional step-up DC-DC converter. The auxiliary resonant consists of additional auxiliary switches; inductor and capacitor are used...
In this paper, a high performance boost converter consisting of an integrated dual-boost converter and a voltage doubler is proposed. The converter possesses quadric voltage gain through single switch and the voltage doubler further increases the voltage gain as the turn ratio rises. The voltage stresses on the switch and diodes are decreased for such cascaded topology. Mathematical analysis of the...
In this paper, a dual-output step-down soft-switching current-fed full-bridge dc-dc converter is proposed. The proposed converter is able to provide two independent outputs. In this topology, zero current switching of primary-side devices and zero voltage switching of secondary-side devices are obtained. In this paper, the proposed converter is analyzed with complete details and all equations of voltage...
This paper presents a detailed power loss model for a microinverter with three different zero voltage switching (ZVS) boundary conduction mode (BCM) current modulation methods. The model is used to calculate the optimum peak current boundaries for each modulation method. Based on the power loss model, a dual-zone modulation method is proposed to further improve the microinverter efficiency. The proposed...
Now a day it is important to improve the energy conversion system in order to achieve increased efficiency of converter. In this work, step up DC-DC converter is studied. The conventional boost converter causes switching loss during turn ON and turns OFF results in reduction in efficiency. For improving efficiency a soft switching pulse width modulated (PWM) Zero-Voltage Transition (ZVT) Zero-Current...
DC-DC converters are utilized in many applications such as automobiles, chargers, uninterrupted power supplies (UPS), and renewable energy systems. Galvanically isolated DC-DC converters are usually selected in electric vehicle (EV) battery charging systems. The converters typically interface between a DC link and a high voltage battery pack. Resonant CLLC DC-DC converters can achieve galvanic isolation,...
This paper presents two novel modulation schemes for a bidirectional single phase inverter with a high frequency link. The topology with the proposed modulation scheme can be used for the grid integration of renewable energy sources like photovoltaic and fuel cell, energy storage system, hybrid and electrical vehicle, vehicle to grid (V2G) integration, uninterruptible power supply (UPS) system. The...
In this paper, a zero-current switching (ZCS) current source converter (CSC) topology is proposed by adding an auxiliary circuit between the dc side. During each commutating process, the auxiliary circuit is activated, so that the outgoing switches can be turned off with zero current switching. As a result, all active switches can reach ZCS operations. This feature makes it possible to increase the...
In this paper, new full bridge and half bridge current-fed converters with switching cells are proposed. Full bridge current-fed converters have several key applications in industry where high gain is required. However, conventional current-fed converters face some significant drawbacks: 1) current commutation problem of input inductor in case of dead time between the top switches of first and second...
This paper explores a new resonant converter which features compact size, high efficiency, and compatibility with self-driven synchronous rectifiers. The proposed resonant converter and the LLC series resonant converter (LLC-SRC) are in the same three-element resonant converter category and these two converters both consist of 2 inductors and one capacitor in their resonant tanks. While the LLC-SRC...
This paper introduces a family of single switch soft switching PWM converters where only one magnetic element is employed. The proposed converters within the family have the ability to provide soft switching conditions for all semiconductor elements. As a result, the problems related to the reverse recovery of diodes are excluded. The lossless passive snubber circuit in this family can be applied...
This paper develops an interleaved resonant power converters for renewable energy systems such like photovoltaic (PV), energy storage system discharging and fuel cell. The renewable application requirements are high voltage gain, reduce input current ripple and overall converter size and high efficiency. The active power switches and energy blocking diode operated at zero voltage switching (ZVS) and...
In this paper, an active-clamping resonant flyback (ACRF) DC/DC converter is proposed. Two switches at the primary side of a single transformer are operated with pulse width modulation (PWM) at zero voltage switching (ZVS) turn-on condition during the dead time between switching instants. On the secondary side of the transformer, two series-resonant circuits are connected to the load through a half...
Alternate Arm Converter (AAC) is considered as a new breed of hybrid multilevel voltage source converters. In this paper, modeling, design and control of the Alternate Arm Converter (AAC) are presented and operation principles of the AAC is discussed. One of the issues regarding to the AAC is the switching between the upper and lower arms which provides hard switching of the so called Director Switches...
This paper presents a new control method for a Modular Multilevel Converter (MMC) fed by a push-pull converter via a medium frequency (MF) transformer. Application of this topology is a universal high-precision 3AC voltage source for a Power Hardware-in-the-Loop Emulator with a frequency range from DC up to almost the medium frequency. Advantages are high efficiency, very low harmonic distortion and...
In this paper a new class of universal power converters that offers significantly higher reliability and power density will be introduced. Universal power converters are single-stage power converters that are capable of interfacing any types of electrical loads and any types of electrical sources regardless of their form, number of phases or frequency. They are also capable of simultaneously interfacing...
This paper presents a front end Luo DC-DC Converter with Snubber circuit to provide high voltage gain, less voltage Ripple, less switching losses, can lead to high Converter Efficiency over the entire input voltage and load variation. The basic idea of the proposed Luo DC-DC Converter is using the positive voltage lifting technique to increase voltage gain, Snubber circuit provide a ZCT-ZVT based...
Modified SEPIC DC-DC Converter with reduced ripple, High efficiency, Low switch voltage, Low input voltage presented in this paper. The magnetic coupling allows to increase the static gain with reduced switch voltage. Input voltage equal to 12V and efficiency equal to 93% was obtained with magnetic coupling with an output voltage equal to 210V and with feedback efficiency is 96% with an output voltage...
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