Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach

C. S. Wong; Y. M. Lai; Ka Hong Loo; Chi Kong Tse

doi:10.1109/EPE.2014.6910829

Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach

C. S. Wong, Y. M. Lai, Ka Hong Loo, Chi Kong Tse

The Hong Kong Polytechnic University

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

3 Citations (Scopus)

Abstract

A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally

Original language	English
Title of host publication	2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014
Publisher	IEEE
ISBN (Electronic)	9781479930159
DOIs	https://doi.org/10.1109/EPE.2014.6910829
Publication status	Published - 1 Jan 2014
Event	2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014 - Lappeenranta, Finland Duration: 26 Aug 2014 → 28 Aug 2014

Conference

Conference	2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014
Country/Territory	Finland
City	Lappeenranta
Period	26/08/14 → 28/08/14

Keywords

Interleaved converters
Lighting
Multiphase drive
Power factor correction

ASJC Scopus subject areas

Electrical and Electronic Engineering

More information

10.1109/EPE.2014.6910829

Cite this

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title = "Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach",

abstract = "A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally",

keywords = "Interleaved converters, Lighting, Multiphase drive, Power factor correction",

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booktitle = "2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014",

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Wong, CS, Lai, YM, Loo, KH & Tse, CK 2014, Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach. in 2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014., 6910829, IEEE, 2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014, Lappeenranta, Finland, 26/08/14. https://doi.org/10.1109/EPE.2014.6910829

Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach. / Wong, C. S.; Lai, Y. M.; Loo, Ka Hong et al.
2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014. IEEE, 2014. 6910829.

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

TY - GEN

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AU - Wong, C. S.

AU - Lai, Y. M.

AU - Loo, Ka Hong

AU - Tse, Chi Kong

PY - 2014/1/1

Y1 - 2014/1/1

N2 - A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally

AB - A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally

KW - Interleaved converters

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KW - Multiphase drive

KW - Power factor correction

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Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach

Abstract

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Keywords

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