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...

This paper describes a modular architecture based on the dual-active bridge (DAB) converter in input-series-output-parallel (ISOP) connection. work is focused input voltage sharing to ensure proper operation of each module by means an active control and output voltages. A small-signal model proposed decoupled loops' scheme used implement strategy. An experimental setup has been built order validate DAB ISOP connection strategy, taking different operating conditions constructive parameter...

<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...

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...

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...

The use of battery-cell equalizers is mandatory in order to assure that all the cells connected series are charged its maximum capacity, even when they present small differences this parameter due several factors, such as aging, manufacturing, or temperature. Active equalizers, with a higher efficiency comparison passive ones, have disadvantage using considerable number components. Moreover, case active very high performance, can be higher. In paper, wave-trap concept, widely used...

A new input current shaper is proposed in this paper. The operating principle based on the connection of a voltage source and loss-free resistor (LFR) between rectifier bulk capacitor conventional switching-mode power supply with no factor correction. Both LFR are obtained as an additional output from converter's transformer. This forward-type scheme one extra inductor. With final topology, good tradeoff voltage, re-cycling energy harmonic content can be established order to comply IEC...

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...

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....

A study of the two-input post-regulators is carried out in this paper. In these post-regulators, only a part total power undergoes switching conversion process, whereas remainder comes up to load directly, with no process. Due fact, very high efficiency achieved. Moreover, stress semiconductors and filter size are both much lower than standard post-regulators. Two-input require two-output main converters. However, many converter topologies can be easily adapted supply voltages penalty....

This paper presents the study of a high-voltage DC/DC resonant converter which has excellent behaviour to be used in applications with strong variations output voltage and current, because it maintains high efficiency these types applications. To do so, switching losses have been minimized by integrating all parasitic elements (leakage inductance, secondary side capacitance transformer capacitances power switches diodes) into topology, conduction operating special mode (optimum line) no...

One of the requirements that electronics circuits must satisfy comprises conducted and irradiated noise specifications. Whereas is well covered in literature, radiated not. Radiated regulations impose limits on measured 3 or 10 m away from electronic equipment. These measurements are usually made anechoic rooms, which very expensive. Moreover, measurement procedure not a ldquoplug-and-playrdquo feature, but requires strict measuring protocol. Once circuit has been tested, designer remains...

<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...

This work presents a review of power-factor-correction (PFC) circuits for low- and medium-power single-phase power supplies. The main idea is not just to show the state art this topic but select most interesting topologies each application depending on level, input voltage range, output voltage. Since IEC 61000-3-2 regulations came into force, many new have been presented trying obtain cost-effective solution reduce current harmonic content. Each one them has its range due inherent...

Electromagnetic interference (EMI) regulations are a very important issue in the design of almost any electronic circuit. Over years, "cut-and-try" procedures have been adopted by designers to make circuits comply with these regulations, mainly due lack reliable theoretical models radiated noise and clear rules. To gain new insight into this field, novel approach is presented paper based on well-known technique field antenna design, i.e., source reconstruction method (SRM). Its application...

Power-factor correction has been one of the hottest topics during last few years and, hence, many new circuits have appeared. In general, it is assumed that preregulators based on multiplier poor dynamics then, a second stage needed to improve output voltage dynamic behavior. The other option use single-stage topologies which fast regulation although input current waveform not sinusoidal. This work presents an analysis behavior conventional power-factor preregulator. objective find limits...

There are several possibilities to transfer the energy taken from a photovoltaic cell grid. In past, modules used same centralized inverter Nowadays, decentralized preferred because of their versatility harvest larger amount power, even when some total surface covered and do not receive solar irradiation. This paper presents an topology that can be connect module directly The is based on single stage Flyback it quite simple. Furthermore, maximum power point tracking algorithm proposed....

The usual way to avoid a computer shutdown during mains failure is connect an ac uninterruptible power system (UPS). However, there are other possibilities, such as using dc UPS obtain the output voltages directly from battery instead of generating voltage feed whole supply. Thus, topology must operate either or battery. A complete design ac/dc supply with internal presented in this paper. solution based on coupling main transformer. Moreover, meets all requirements needed be used Advanced...

Improvements in power electronics are basically the result of research two main fields, namely: 1) new topologies and 2) devices. Researchers' efforts to achieve improved necessarily limited by characteristics As a result, both devices must move forward jointly at same time. This letter studies impact silicon carbide diodes on classic structure power-factor correction-the boost converter.

There are three types of static uninterruptible power supplies (UPSs): passive standby, line interactive, and double conversion. The last one protects the load against all disturbances, but it is most expensive with lowest efficiency. On other hand, passive-standby line-interactive UPSs have higher efficiency lower cost, they show an important drawback: a switching time from normal to stored-energy mode. As consequence, there notch in UPS output voltage during this time. In previous paper,...