Abstract
although a single-stage off-line power LED driver can achieve low cost and high efficiency, the notorious double-line-frequency flicker issue with a single-stage LED driver limits its usage in high-quality lighting applications. To solve lighting flicker, as well as maintain a low cost and high efficiency, a Multiplexing Ripple Cancellation (MRC) LED driver is proposed in this paper. One switching cycle is divided into two intervals. During the first interval, the proposed LED driver operates as a conventional LED driver that transfers energy from AC input to LED output, performs power factor correction and generates the main output voltage. The main output voltage has a double-line-frequency ripple like in a conventional design. During the second interval, the proposed LED driver transfers energy from AC input again to generate an opposite ripple voltage to cancel the ripple voltage from the main output. In this way, the voltage across LED load is a DC to achieve flicker-free LED driving performance. More than 99% of the output power goes through one-time power conversion while less than 1% goes through two-time power conversion. A 7.5W experimental prototype had been built and tested to verify the design concept.
Original language | English (US) |
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Title of host publication | 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 3414-3420 |
Number of pages | 7 |
ISBN (Electronic) | 9781538683309 |
DOIs | |
State | Published - May 24 2019 |
Event | 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 - Anaheim, United States Duration: Mar 17 2019 → Mar 21 2019 |
Publication series
Name | Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC |
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Volume | 2019-March |
Conference
Conference | 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 |
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Country/Territory | United States |
City | Anaheim |
Period | 3/17/19 → 3/21/19 |
Bibliographical note
Publisher Copyright:© 2019 IEEE.
Keywords
- Flick-free operation
- Multiplexing operation
- Ripple cancellation
- Single stage