The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<<ETX>>

Multi-level conversion : high voltage choppers and voltage-source inverters

Due to limitations of low power density, high cost, heavy weight, etc., the development and application of battery-powered devices are facing with unprecedented technical challenges. As a novel pattern of energization, the wireless power transfer (WPT) offers a band new way to the energy acquisition for electric-driven devices, thus alleviating the over-dependence on the battery. This paper presents an overview of WPT techniques with emphasis on working mechanisms, technical challenges, metamaterials, and classical applications. Focusing on WPT systems, this paper elaborates on current major research topics and discusses about future development trends. This novel energy transmission mechanism shows significant meanings on the pervasive application of renewable energies in our daily life.

Wireless Power Transfer—An Overview

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Power Electronics Converters Applications And Design

Electrifying transportation is a promising approach to alleviate the climate change issue. The adoption of electric vehicle into market has introduced significant impacts on various fields, especially the power grid. Various policies have been implemented to foster the electric vehicle deployment and the increasing trend of electric vehicle adoption in the recent years has been satisfying. The continual development of electric vehicle power train, battery and charger technologies have further improved the electric vehicle technologies for wider uptake. Despite the environmental and economical benefits, electric vehicles charging introduce negative impacts on the existing network operation. Appropriate charging management strategies can be implemented to cater for this issue. Furthermore, electric vehicle integration in the smart grid can bring many potential opportunities, especially from the perspective of vehicle-to-grid technology and as the solution for the renewable energy intermittency issue. This paper reviews the latest development in electric vehicle technologies, impacts of electric vehicle roll out and opportunities brought by electric vehicle deployment.

A review on the state-of-the-art technologies of electric vehicle, its impacts and prospects

Energy harvesting: State-of-the-art

In this paper, an improved bridgeless single-ended primary inductance converter (SEPIC) power factor correction (PFC) rectifier is introduced. By introducing an additional output diode into conventional bridgeless SEPIC PFC rectifier, an undesired capacitive coupling loop is removed, not only eliminating the circulating loss but also reducing the sensing noise. Moreover, an integrated magnetics with symmetrical structure could be utilized so as to reduce the system size and increase the circuit power density. The operation principle of the proposed converter is investigated, and simulation results are provided. A 100-W prototype with 110Vrms input line voltage and 50V dc output voltage is built and tested. A peak efficiency of 91% and power factor above 0.98 are achieved under 100kHz switching frequency operation condition.

An improved bridgeless SEPIC PFC rectifier with optimized magnetic utilization, minimized circulating losses, and reduced sensing noise

In this paper, a novel single-switch three-level (TL) boost converter for PWM dimming LED lighting is presented. Taking the system efficiency and output ripple into consideration, traditional two-level boost LED driver always employs additional active switch in order to deal with the dimming issue. However, the proposed TL boost converter has overcome the dimming control problem with only one switch by utilizing the “synchronous” PWM dimming approah, hence lower the system cost. Moreover, compared with the standard TL boost converter, the proposed topology not only maintains the advantage of using a lower voltage rating power switch that is rated half the output voltage, but also eliminates one active switch and its associated driving circuit. The operating principle and dimming scheme of the proposed TL boost converter is described in detail. A prototype of 11-W dimmable LED driving converter has been implemented to verify the design and analysis. The experimental result shows that single-switch TL boost converter can regulate the LED current from zero to the rated 350mA with fast slew rate. A peak efficiency of 95% was achieved with 400kHz switching frequency.

Single-switch three-level boost converter for PWM dimming LED lighting

Microconverters used for modular photovoltaic (PV) power conditioning systems require high efficiency over a wide input-voltage range. This paper introduces a series resonant converter through hybrid operation to meet this requirement. Under all input voltage conditions, the converter can achieve zero-voltage switching (ZVS) and/or zero-current switching (ZCS) of the primary-side devices and ZCS and/or ZVS of the secondary-side devices. The topologies and the three operation modes are introduced firstly. Especially, the steady state analysis based on the steady trajectories are presents in details. The design procedures of the power state are also introduced. The experimental results based on a 300-W prototype are given with 98.1% peak power stage efficiency and 97.6% CEC efficiency including all the auxiliary and control power under the 30V input voltage condition.

A high-efficiency hybrid series resonant DC-DC converter with boost converter as secondary for photovoltaic applications

SUMMARY

The AC–DC power supply for LED lighting application requires a long lifetime while maintaining high-efficiency, high power factor and low cost. However, a typical design uses electrolytic capacitor as storage capacitor, which is not only bulky but also with short life span, thus hampering performance improvement of the entire LED lighting system. In this article, a SEPIC-derived power factor correction topology is proposed as the first stage for driving multiple lighting LED lamps. Along with a relatively large voltage ripple allowable in a two-stage design, the proposal of LED lamp driver is able to eliminate the electrolytic capacitor while maintaining high power factor and high efficiency. To further increase the efficiency of LED driver, we introduced and used the twin-bus buck converter as the second-stage current regulator with Pulse Width Modulation (PWM) dimming function. The basic operating principle and the deign consideration are discussed in detail. A 50-W prototype has been built and tested to verify the proposal. Copyright © 2011 John Wiley & Sons, Ltd.

A universal‐input high‐power‐factor power supply without electrolytic capacitor for multiple lighting LED lamps

In this paper, a single-stage integrated bridgeless AC/DC converter is proposed. As compared to its counterpart that is composed of totem-pole boost power factor correction PFC cascade fly-back DC/DC converter, the studied circuit has less components number while overcoming the limits of the totem-pole type. Thus, it is suitable to the low-power LED lighting applications. Furthermore, when both PFC inductors Lb and magmatic inductance Lm of the transformer TR1 operate at discontinuous current mode, the bus voltage vCB can be used to decouple the ac input and constant dc output power. Thus, the approach of increasing bus voltage ripple is employed to eliminate electrolytic capacitors and obtain long operation lifetime. Additionally, it is able to be compatible with our studied twin-bus configuration for increasing the overall efficiency. A 50-W hardware prototype has been designed, fabricated, and tested in the laboratory to verify the proposed converter validity. Copyright © 2014 John Wiley & Sons, Ltd.

Cong Zheng

Papers

An improved bridgeless SEPIC PFC rectifier with optimized magnetic utilization, minimized circulating losses, and reduced sensing noise

Single-switch three-level boost converter for PWM dimming LED lighting

A high-efficiency hybrid series resonant DC-DC converter with boost converter as secondary for photovoltaic applications

A universal‐input high‐power‐factor power supply without electrolytic capacitor for multiple lighting LED lamps

A single-stage integrated bridgeless AC/DC converter for electrolytic capacitor-less LED lighting applications