S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Dimmable LED Driver with Precise Power Metering

Yu-Jen Chen, Guan-Yi Wu, and Ching-Ran Lee

(Received June 30, 2021; Accepted December 13, 2021)

Keywords: dimmable LED driver, high power efficiency, high power factor, power metering

A dimmable light-emitting-diode (LED) driver with precise power metering is proposed in this paper. A buck-type power factor corrector (PFC) circuit with the merits of high power efficiency and high power factor (PF) is adapted in the LED driver. The input power of the LED driver can be evaluated precisely by calculating the sensed voltage and current on the output terminal of the PFC circuit. The slight reduction of the power efficiency during dimming can eliminate the error of the power evaluation. Therefore, the electrical sensors of the feedback circuit and the computation algorithm for power evaluation can be simplified to meet the requirements of high accuracy and cost-effectiveness. The detailed design topology, evaluation method, and verification results are provided. In experiments, dimmable LED drivers rated at 20 W exhibited an error of less than 2% when operating from 5 to 20 W and an error of less than 5% when operating from 2 to 5 W.

Corresponding author: Yu-Jen Chen




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