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320 results on '"LU, DYLAN DAH-CHUAN"'

11. Design, Implementation and Reliability Assessment of a Fault-Tolerant Three-Port Converter

Author

Alam, Muhammad Mubashir, Farhangi, Majid, Lu, Dylan Dah-Chuan, Siwakoti, Yam P., and Aljarajreh, Hamzeh

Abstract

This article proposes a novel three-port converter with a fault-tolerant (FT) capability to reconfigure automatically under different switching fault conditions, i.e., open circuit fault (OCF) and short circuit fault (SCF) of the power transistors, and to continue achieving different control objectives such as effective battery charging, maximum power point tracking (MPPT), and output voltage regulation. The proposed fault-tolerant design with a one-level redundancy structure enhances the reliability of traditional three-port converters (TPCs). Experimental results of a laboratory prototype has proven the effectiveness of the proposed converter.

Published
2024
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44. Single-stage ac/dc boost-forward converter with high power factor and regulated bus and output voltages

Author

Lu, Dylan Dah-Chuan, Iu, Herbert Ho-Ching, and Pjevalica, Velibor

Subjects
Electric current converters -- Design and construction, Voltage -- Measurement, Voltage -- Control, Clamping circuits -- Design and construction, Electric current converter, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Unlike existing single-stage ac/dc converters with uncontrolled intermediate bus voltage, a new single-stage ac/dc converter achieving power factor correction (PFC), intermediate bus voltage output regulation, and output voltage regulation is proposed. The single-power-stage circuit is formed by integrating a boost PFC converter with a two-switch-clamped forward converter. The current stress of the main power switches is reduced due to separated conduction period of the two source currents flowing through the power switch. A dual-loop peak-current-mode controller is proposed to achieve PFC and ensure independent bus voltage and output voltage regulations. Experimental results on a 24-V/100-W hardware prototype are given to confirm the theoretical analysis and performance of the proposed converter. The converter has conversion efficiency ranging from 86% to 92% at full-load condition. Index Terms--AC/DC converter, power factor correction (PFC), single-stage.

Published
2009

45. Photovoltaic-battery-powered DC bus system for common portable electronic devices

Author

Lu, Dylan Dah-Chuan and Agelidis, Vassilios G.

Subjects
Electric current converters -- Design and construction, Photovoltaic power generation -- Methods, Power electronics -- Research, Electric current converter, Business, Electronics, Electronics and electrical industries
Abstract

Renewable energy sources based on photovoltaic (PV) along with battery-based energy storage necessitate power conditioning to meet load requirements and/or be connected to the electrical grid. The power conditioning is achieved via a dc-dc converter and a dc-ac inverter stages to produce the desired ac source. This is also the case even when the load is of dc type, such as the typical portable electronic devices that require ac adaptors to be powered from the ac mains. The letter presents a hybrid PV-battery-powered dc bus system that eliminates the dc-ac conversion stage, resulting in lower cost and improved overall energy conversion efficiency. It is also shown experimentally that the switching ac adaptors associated with the various commonly used portable electronic devices can be reused with the proposed dc bus system. A novel high-gain hybrid boost-flyback converter is also introduced with several times higher voltage conversion ratio than the conventional boost converter topology. This arrangement results in higher dc bus levels and lower cable conduction losses. Moreover, the voltage stress on the hybrid boost-flyback converter power switch is within half the output voltage. Experimental results taken from a laboratory prototype are presented to confirm the effectiveness of the proposed converter/system. Index Terms--DC bus, dc--dc converter, hybrid boost-flyback converter, photovoltaic (PV) power system.

Published
2009

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