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AC-DC converters are mostly used as power supplies for microelectronic systems, battery chargers, wind energy applications, electric appliances in household and dc motor drives. Switched-capacitor (SC) network based converters can be good solution to the challenges of 21st century having high voltage conversion ratio and low EMI emissions. The application of this type of converters is in microprocessor...
This paper presents a high-power-density high-power-factor GaN-based two-stage electrolytic-free offline LED driver. The LED driver achieves high power density through the use of a hybrid film-ceramic stacked switched capacitor (SSC) energy buffer, and a comprehensive optimization methodology that evaluates various converter topologies and designs, and minimizes overall system volume while maintaining...
A quasi single-stage power factor correction converter, which is composed of a three-level (TL) Boost converter and a DC-DC transformer (DCX), is presented and analyzed in this paper. The DC output load is connected to one of the dividing capacitors of the TL Boost converter, so that the load voltage can be lower than the peak amplitude of the AC line voltage and part of the AC input power can be...
In this paper, a novel bridgeless Flyback power factor correction rectifier is presented. Two active power switches, rather than the line-voltage diode bridge, are used to provide the bidirectional power flow. In comparison with the existing Flyback rectifiers, the proposed topology uses less number of transformer windings which simplifies the complexity of implementation in terms of magnetic utilization...
PFC converters are widely used in industrial drive systems. The modulation scheme and the topology of the converter have a considerable impact not only on the switching losses, but also on the volume of the passive components, i.e. the EMI filter (CM and DM) and the dC link capacitors. In order to evaluate this impact, different modulation schemes for 2L and 3L topologies are analysed in this paper...
In this paper, power factor corrected novel ac-dc rectifier topologies for 1-ph and 3-ph application are proposed. These converters provide high gain and do input current shaping as well. A mutual inductor is used at the ac side for providing high gain as well as current shaping. The ripple energy of the system is analyzed. The relations between the ripple energy of 1-ph and 3-ph system with power...
A new topology of single-phase SEPIC (Single Ended Primary Inductor Converter) AC-DC converter with low input current THD and high input power factor is proposed. Instead of using a single phase rectifier followed by a boost DC-DC converter, or using a bridge rectifier with two diodes and two switches, the rectifier's input is chopped at high frequency during positive and negative cycles by a single...
A novel bridgeless Buck power factor correction (PFC) converter with only half dead zones is proposed in this paper. The operation of the proposed PFC converter can be divided into two different modes including Buck mode in positive line cycles and Cuk mode in negative line cycles. Compared with the bridge or bridgeless Buck PFC converter, only half dead zones occur in this proposed PFC converter...
With increasing dominance of renewable energy resources and DC household appliances, the novelty of DC micro grid is attracting significant attention. The key interface between the main supply grid and DC micro grid is AC to DC converter. The conventional AC to DC converter with large output capacitor introduces undesirable power quality problems in the main supply current. It reduces system efficiency...
This paper proposes a bidirectional bridgeless totem-pole interleaved power-factor-correction (PFC) converter using SiC MOSFETs as the front-end stage of an onboard charger for plug-in electric vehicles (PEVs). The proposed converter provides bidirectional operation enabling both grid-to-vehicle (G2V) charging and vehicle-to-grid (V2G) ancillary services. The converter is suitable for efficient G2V...
In this paper, a novel zero-voltage-switching topology for power factor correction bridgeless boost rectifier is proposed. By employing an improved switch cell, ZVS for all the main switches is achieved without additional current or voltage stress. The zero-current-switching is also provided for the auxiliary switch. In all modes of operation of this converter, the input current flows through only...
This paper presents a novel bidirectional ac-dc topology based on modular multilevel converter and employing the interleaving concept suitable for solid-state transformer applications. The main features of this topology are derived from the interleaving technique and the cascaded converters concepts, as reduced conduction losses, passive elements operating with effective high frequency, reduced weight...
A power-factor-correction (PFC) rectifier using a novel circuit topology and its control method was developed and tested. To reduce both conduction and switching losses, the proposed circuit is based on a bridgeless PFC boost rectifier with a zero-voltage-switching (ZVS) function. To achieve ZVS, the proposed circuit topology employs a simple auxiliary circuit consisting of one MOSFET, one inductor,...
Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandescent and fluorescent lamps due to their long life time and higher efficacy. Therefore, also the life time and efficiency of the LED-ballast are important in order to improve the overall system. In addition, size and costs are relevant factors in the highly competitive LED market. The paper presents a...
This paper presents a bridgeless SEPIC topology with Power Factor Correction (PFC) to charge electric vehicle battery. The converter offers a few advantages such as reduce total component count and reduction of conduction loss during the conversion AC to DC, hence higher overall system efficiency. The PFC converter operated under continuous conduction mode (CCM) with average current mode control strategy...
In this paper, a new single phase ac-dc PFC bridgeless rectifier with multiplier stage to improve the efficiency at low input voltage and reduce the switch-voltage stress, is introduced. The absence of an input rectifier bridge in the proposed rectifier and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and improved...
Light emitting diodes (LEDs) have great potential to replace existing light sources, like incandescent and fluorescent lamps due to their long life time and higher efficacy. Therefore, also the life time and efficiency of the LED-ballast are important factors in order to improve the overall system. In addition, size and costs are a relevant factor in the highly competitive LED market. With the benefits...
This paper presents a single-stage quasi z-source flyback Power Factor Correction (PFC) AC-DC converter which features high efficiency, unity power factor (PF), and low Total Harmonic Distortion (THD) under wide range input voltage operation. The proposed PFC converter can achieve very low voltage spike on switch by utilizing a common topology, namely quasi z-source topology that has been widely used...
The use of the electrodeless fluorescent lamps has been increasing, because of their features such as lifetime and lumen efficiency, when compared to conventional fluorescent and high pressure sodium lamps. The single-stage high-power-factor electronic ballast for electrodeless fluorescent lamp with dimming feature is presented on this paper. It is obtained by integrating a SEPIC converter with a...
Here a recent single-phase AC/DC rectifier is analysed then proposed for building a new fault-tolerant converter. It operates in continuous current and PFC modes and it is under control of analog AC and DC controllers. This Boost-type rectifier involves two switches and can operate in different ways thus improves the continuity of the energy transfer in case of failures.
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