This paper addresses the performance of bidirectional dual active bridge (DAB) converter. One advantages DAB is possibility to achieve zero-voltage switching (ZVS) operation in all switches this However, ZVS range can be lost for light loads, especially if high voltage required at least one ports and phase-shift control used regulate power processed by Theoretically simple averaged small-signal models are presented Using study paper, boundaries easily evaluated. The proposed analysis allow...

The increase demand of an intermediate storage electrical energy in battery systems, particular due to the use renewable energy, has resulted need bidirectional DC/DC power converters with galvanic isolation. Uninterruptible Power Supplies (UPS), charging photovoltaic equipment and auxiliary supplies traction applications are examples some fields application this kind converters. A Dual Active Bridge (DAB) converter is a topology advantages decreased number devices, soft-switching...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The piecewise linear model has traditionally been used to calculate switching losses in mode power supplies due its simplicity and good performance. However, the use of latest low voltage MOSFET generations continuously increasing range frequencies have made it necessary review this account for parasitic inductances that does not include. This paper presents a complete analytical loss MOSFETs...

High-brightness LEDs are considered remarkable lighting devices due to their high reliability, chromatic variety, and increasing efficiency. As a result, number of solutions for supplying LED strings emerging. One-stage cost-effective, but efficiency is low because they have fulfill several purposes with only one converter: power factor correction (PFC), galvanic isolation (in some cases), current regulation. Two-stage three-stage higher each stage optimized or two tasks the preferred...

High-brightness light-emitting diodes (LEDs) are considered as a remarkable lighting device due to their high reliability, chromatic variety, and increasing efficiency. As consequence, number of solutions for supplying LED strings coming out. One-stage cost effective, but efficiency is low they have fulfill several purposes with only one converter: power factor correction (PFC), galvanic isolation (in some cases), current regulation. Two-stage three-stage higher each stage optimized just or...

This article presents an in-depth analysis of all electric-aircraft (AEA) architectures. work aims to provide a global vision the current AEA state art, estimate main technological gaps and drivers, identify most promising architecture configuration for future electrical aircraft in context twin-propeller 20-MW aircraft. The comparison between architectures is done based on three different figures merit: reliability, efficiency, specific power density. methodology presented trade studies are...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents a new control strategy for power factor correctors (PFCs) that are used to drive high-brightness LEDs. is extremely simple and based on the use of conventional peak-current-mode controller with suitable selection compensation ramp waveform. Neither an analog multiplier nor input voltage sensor needed achieve quasi-sinusoidal line waveforms at nominal conditions full load. If...

Active power-factor correctors (PFCs) are needed to design ac-dc power supplies with universal input voltage range and sinusoidal current. The classical method control PFCs consists in two feedback loops an analog multiplier. Hence, the current is it in-phase voltage. However, a bulk capacitor balance output power. Due its high capacitance, electrolytic traditionally used as PFCs. As consequence, lifetime of supply limited by capacitor's, which becomes insufficient some applications (e.g.,...

Due to their high reliability and luminous efficacy, high-brightness light-emitting diodes are being widely used in lighting applications, therefore, power supplies required have also efficiency. A very common approach for achieving this ac-dc applications is using a two-stage topology. The factor corrector boost converter operating the boundary conduction mode as first stage. It normally designed without electrolytic capacitors, improving but increasing low-frequency ripple of output...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, a novel single-stage electronic ballast with high power factor is presented. The circuit based on the integration of buck converter to provide correction, and flyback control lamp supply low-frequency square-waveform current. Both converters work in discontinuous conduction mode, which simplifies control. spite being an integrated topology, does not present additional stress...

This paper presents a new control strategy for power factor correctors (PFCs) used to drive high-brightness light-emitting diodes (HB-LEDs). is extremely simple and based on the use of standard peak-current-mode integrated controllers (PCMICs), reducing its cost complexity in comparison traditional PFC controllers. In fact, this method an alternative implementation one-cycle PFCs belonging flyback family converters, without introducing high total harmonic distortion. case, exponential...

A new analytical model is presented in this work to predict power losses and waveforms of high-voltage silicon SuperJunction (SJ) MOSFET during hardswitching operation.This depends on datasheet parameters the semiconductors, as well as, parasitics obtained from printed circuit board characterization.It important note that it also includes original features accounting for strong capacitive non-linearities displacement currents.Moreover, these demand unusual extraction electrical...

This paper presents the introduction of problem-based learning (PBL) in a power electronics course at University Oviedo, Gijón, Spain, by means two practical projects: design and construction switching-mode supply (SMPS) prototype static study dc-dc converter topology. The goal this innovation was for students to apply practice knowledge they had acquired theory classes. PBL is known be motivating, problem-centered teaching method that brings real professional world closer student....

High-brightness light-emitting diodes (HB-LEDs) are recognized as being potential successors of incandescent bulb lamps due to their high luminous efficiency and long lifespan. To achieve these advantages, HB-LED ballast must be durable efficient. Furthermore, for this specific application, ac-dc requires a high-step-down ratio, power factor low cost. This paper presents tapped-inductor buck corrector (PFC) operating in boundary conduction mode design replacing lamps. low-cost solution...

Low cost passive power factor correction (PFC) and single-stage PFC converters cannot draw a sinusoidal input current are only suitable solutions to supply low levels. preregulators based on the use of multiplier solve such drawbacks, but second stage dc-dc converter is needed obtain fast output voltage dynamics. The response can be improved by increasing corner frequency feedback loop. main drawback obtaining faster distortion current. This paper describes simple control strategy Based...

Silicon Carbide (SiC) devices are becoming increasingly available in the market due to mature stage of development fact their manufacturing process. Their numerous advantages compared silicon (Si) devices, such as, for example, higher blocking capability, lower conduction voltage drop, and faster transitions make them more suitable high-power high-frequency converters. The aim this paper is study switching behavior two most-widely studied configurations SiC literature: normally-on JFET...

A dc-dc power converter based on a two-phase synchronous buck that reproduces single-carrier digital modulation schemes by controlling the first switching harmonic of output voltage ripple is presented in this paper. The carries out both lighting and transmission functionalities visible light communication transmitters. Control amplitude phase sinusoidal currents injected toward high-brightness LEDs enable use efficient schemes, such as quadrature modulation, carrierless amplitude-shift...

The continuous demand of increasing data rates provided by wireless communication systems is contributing to saturating the RF spectrum. Visible light (VLC) aim alleviate this congestion using visible These have been proposed make use high-brightness LEDs (HB-LEDs) not only for lighting but also transmitting information rapidly changing intensity emitted light. A critical issue that VLC requires a fast HB-LED driver in order reproduce target waveforms, which can include components several...

Visible light communication (VLC) has gained relevance during the last few years. It consists in using high-brightness LEDs (HB-LEDs) both for lighting and transmitting information by changing intensity rapidly. However, there are some bottlenecks that slowing down deployment of this technology. One most important problems is HB-LED drivers proposed addressing high data rates VLC achieve poor power efficiency. Since these must be able to reproduce fast current waveforms, use linear...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The classical design of an active power factor corrector (PFC) leads to slow transient response in this type converter. This is due the fact that compensator placed output-voltage feedback loop usually designed have narrow bandwidth filter voltage ripple twice line frequency coming from PFC output. with filtering effect because a relatively high would cause considerable distortion reference...

The ripple modulation (RM) is a technique that provides variable output voltage by using the of switching-mode power converter. It was proposed to reproduce communication signal visible light transmitter, thus avoiding use inefficient linear amplifiers. However, RM has major drawback: it not been reported how multicarrier (MCM) schemes, which are preferred schemes due their high performance in wireless communications. In this paper, demonstrated can be used MCM considering envelope and...

This work proposes a High-Brightness LED (HB-LED) driver for Visible Light Communication (VLC) based on two converters, high frequency Buck DC/DC converter and low Boost converter, connected in series with respect to the load parallel at input. topology is called Series/Parallel Boost/Buck Converter. A VLC system needs do different tasks: biasing HB-LED generating communication signal. These typically have power requirements, bias 3/4, while 1/4 of total power. The requirements each are also...

This paper presents a high-brightness LED (HB-LED) driver for visible light communication (VLC) based on two converters. The first is high-frequency buck DC/DC converter and the second low-frequency boost converter, connected in series with respect to load parallel at input, forming series/parallel boost/buck converter. It well known that VLC system needs perform different tasks: biasing HB-LED transmitting signal. These typically have power requirements; bias 75%, while 25% of total power....