Switched-Capacitor-Based Current Compensator for Mitigating the Effect of Long Cable between PWM Driver and LED Light Source

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

2 Scopus Citations
View graph of relations

Detail(s)

Original languageEnglish
Pages (from-to)6171-6186
Journal / PublicationIEEE Transactions on Power Electronics
Volume33
Issue number7
Online published21 Aug 2017
Publication statusPublished - Jul 2018

Abstract

It is sometimes unavoidable to have light-emitting-diode (LED) light sources and their pulsewidth modulation (PWM) drivers connected by long cables in large-scale illuminations. However, long-cable inductance delays the rate of rise of the driving current pulses and thus leads to the reduction of luminous flux output. It also causes the off-state voltage across the light sources negative, which would deteriorate the life expectancy of the LEDs. A switched-capacitor-based current compensator for correcting the wave shape of the driving current pulses is presented. The methodology is based on transferring the energy stored in the cable to a capacitor at the end of the current pulse and then momentarily boosting the voltage with the capacitor applying to the cable at the beginning of the next current pulse. Thus, the rise time of the current pulses can be shortened. The topological states and operations of the compensator will be described. A simplified design procedure will be given. A prototype for a 12-V, 3-A PWM driver has been built and evaluated. Performance comparisons between the proposed current compensator and prior art and between the systems with and without the compensators will be conducted.

Research Area(s)

  • Cable length effect, DC-DC power conversion, light-emitting-diode (LED) lighting, lighting control

Citation Format(s)

Switched-Capacitor-Based Current Compensator for Mitigating the Effect of Long Cable between PWM Driver and LED Light Source. / Zhou, Rui; Yeung, Ryan Shun-cheung; Chan, John Yau-chung; Tse, Norman Chung-fai; Chung, Henry Shu-hung.

In: IEEE Transactions on Power Electronics, Vol. 33, No. 7, 07.2018, p. 6171-6186.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal