Yearly Archives: 2013

A high efficiency synchronous power converter for photovoltaic applications

Abstract

This paper introduces a new switching technique fornon-inverting synchronous buck-boost converter. It is operated at highefficiency during buck, boost and buck-boost mode. The design of the system was implemented using PSIM. Performance of the proposed system for various load current and input voltage condition was investigated during all modes. Simulation results prove that the new switching method is superior to conventional method due to high efficiency. The voltage range preferred in this design covers 5-25V with amaximum power of 65W. The proposed converter could be incorporated into solar portableapplication in order to overcome the variation of source voltage.

A Safety Enhanced, High Step-Up DC–DC Converter for AC Photovoltaic Module Application

Abstract
Within the photovoltaic (PV) power-generation market, the ac PV module has shown obvious growth. However, a high voltage gain converter is essential for the module’s grid connection through a dc-ac inverter. This paper proposes a converter that employs a floating active switch to isolate energy from the PV panel when the ac module is off; this particular design protects installers and users from electrical hazards. Without extreme duty ratios and the numerous turns-ratios of a coupled inductor, this converter achieves a high step-up voltage-conversion ratio;

A ZVS Interleaved Boost AC/DC Converter Used in Plug-in Electric Vehicles

Abstract

This paper presents a novel, yet simple zero-voltage switching (ZVS) interleavedboost power factor correction (PFC) ac/dcconverter used to charge the traction battery of an electric vehicle from the utility mains. The proposed opology consists of apassive auxiliary circuit, placed between two phases of the interleaved front-end boost PFC converter, which provides enough current to charge and discharge the MOSFETs’ output capacitors during turn-ON times. Therefore, the MOSFETs are turned ON at zero voltage.

Analysis and Design of a Single-Stage High-Power-Factor Dimmable Electronic Ballast for Electrodeless Fluorescent Lamp

Abstract

Amethodological study of an electronicballast for electrodeless fluorescent lamps (EFL) including design anddevelopment issues is presented in this paper. The ballast is intended to feed a100 W EFL at 250 kHz with dimming feature. The proposed topology is composed of a Single-Ended Primary Inductance Converter (SEPIC), used as powerfactor correction (PFC) stage, integrated with a resonant half-bridge inverter, used as lamp powercontrol (PC) stage. The integration of both stages is proposed in this paper, in order to reduce the number of active switches,

Analysis and Design of a Zero-Voltage-Switching and Zero-Current-Switching Interleaved Boost Converter

Abstract

A novel interleaved boost converter with zero-voltage switching (ZVS) and zero-currentswitching (ZCS) characteristics is proposed in this paper. By using the interleaved approach, this topology not only decreases the current stress of the main circuit device but also reduces the ripple of the input current and output voltage. Moreover, by establishing the common soft-switching module, the soft-switching interleavedconverter can greatly reduce the size and cost. The main switches can achieve the characteristics of ZVS andZCS simultaneously to reduce the switching loss and improve the efficiency with awide range of load.

Analysis and Implementation of a Novel Bidirectional DC–DC Converter

Abstract

A novelbidirectional dc-dc converter is presented in this paper. The circuit configuration of the proposed converter is very simple. The proposed converter employs a coupled inductor with same winding turns in the primary andsecondary sides. In step-up mode, the primary andsecondary windings of the coupled inductor are operated in parallel charge andseries discharge to achieve high step-up voltage gain. In step-down mode, the primary and secondary windings of the coupled inductor are operated in series charge andparallel discharge to achieve high step-down voltage gain.

Control of a two-port supercapacitor converter based on differential flatness principle for transportation applications

Abstract

This paper presents a new controlstrategy for dc-link stabilization in weak transportation networks that use supercapacitors as the energy storage unit. A two-port isolated converter based on adual active bridge topology is presented, and areduced-order mathematical model of the system is described forpower plant control. Using a nonlinear controlapproach based on the flatness property, we proposeasimple solution to dynamic and stabilization problems in the power electronics systems oftransportationnetworks.

Design and Performance of a Bidirectional Isolated DC–DC Converter for a Battery Energy Storage System

Abstract

 

This paper describes the designand performance of a 6-kW, full-bridge, bidirectional isolated dc-dc converterusing a 20-kHz transformer fora 53.2-V, 2-kWh lithium-ion (Li-ion) battery energy storage system. The dc voltage at the high-voltage side is controlled from 305 to 355 V, as the battery voltage at the low-voltage side (LVS) varies from 50 to 59 V. The maximal efficiency of the dc-dc converteris measured to be 96.0% during battery charging, and 96.9% duringbatterydischarging. Moreover, this paper analyzes the effect ofunavoidable dc-bias currents on the magnetic-flux saturation of the transformer. Finally, it provides the dc-dc converter loss breakdown with more focus on the LVSconverter.

Extended Range ZVS Active-Clamped Current-Fed Full-Bridge Isolated Dc/Dc Converter for Fuel Cell Applications: Analysis, Design and Experimental Results

Abstract

 

This paper presents analysis and design of zerovoltage switching (ZVS) active-clamped current-fed full-bridgeisolateddc/dc converter for fuel cells applications. The designed converter maintains ZVS of all switches from full-load down to very light load condition over wide input voltage variation. Detailed operation, analysis, design, simulation and experimental results for the proposed design are presented. The additional auxiliary active clamping circuit absorbs the turn-off voltage spike limiting the peak voltage across the devices allowing the selection and use of low voltage devices with low on-state resistance.

Extended-Phase-Shift Control of Isolated Bidirectional DC–DC Converter for Power Distribution in Microgrid

Abstract

 

This paper points out a phenomenon of power backflow in traditional phase-shift (TPS) control of isolatedbidirectionalfull-bridge DC-DC converter (IBDC), and analyzes the effects which backflow power act on power circulating flow and current stress. On this basis, the paper proposes a novel extended-phase-shift (EPS) control of IBDC for powerdistributionin microgrid. Compared with TPS control, EPS controlnot only expands regulating range of transmission powerand enhances regulating flexibility, but also reduces current stress and improves the system efficiency.
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