Constant frequency, non‐isolated multichannel LED driver based on variable inductor

Autor:	Guozhuang Liang, Hanlei Tian, Hetong Wang, Yiwen Xia, Xianyong Xiao
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	frequency control zero voltage switching inductors bridge circuits light emitting diodes electromagnetic interference Computer engineering. Computer hardware TK7885-7895
Zdroj:	IET Circuits, Devices and Systems, Vol 15, Iss 8, Pp 803-813 (2021)
Druh dokumentu:	article
ISSN:	1751-8598 1751-858X
DOI:	10.1049/cds2.12072
Popis:	Abstract To obtain the required LED‐driving current, variable frequency control directly leads to large reactive circulation, and the design of the electromagnetic interference circuit is more complex. However, soft switching cannot be guaranteed by constant frequency operation under load variations. Hence, a multiplex LED‐dimming circuit based on a variable inductor is proposed that completes the constant frequency operation and realizes zero‐voltage switching to improve efficiency. The proposed circuit with a superimposed half‐bridge structure increases the number of outputs and simultaneously shares the resonant inductor so that the power density is improved and the LED‐dimming unit is simplified. The working principle of the circuit is described—it uses eight‐channel output to build an 80 W experimental prototype to verify the feasibility of the LED driver.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/484b588320f243aea29fe1269df594b2 Zobrazit plný text záznamu Plný text View record in DOAJ