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An efficient full‐bridge resonant converter for light emitting diode (LED) application with simple current control
Author(s) -
Ramakrishnareddy Ch Kasi,
Porpandiselvi Shunmugam,
Vishwanathan Neti
Publication year - 2019
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2694
Subject(s) - led circuit , pulse width modulation , rectifier (neural networks) , electrical engineering , led lamp , constant current , voltage , diode , power (physics) , engineering , light emitting diode , electronic engineering , computer science , physics , short circuit , stochastic neural network , quantum mechanics , machine learning , recurrent neural network , artificial neural network
Summary New power control is introduced in the full‐bridge dc‐dc converter to drive an LED lamp in this paper. LEDs are semiconductor devices that behave like a constant voltage load with low equivalent series resistance (ESR). Hence, they require precise control for current regulation. In the proposed driver, the LED lamp is driven by two voltage sources connected in series through a series resonant circuit. It processes the majority of lamp power through the full‐bridge diode rectifier and supplies small power through a center‐tapped rectifier. The LED lamp current is controlled at the selected operating current by using center‐tapped rectifier output voltage. In addition, pulse‐width modulation (PWM) dimming is implemented. The proposed topology features zero‐voltage switching (ZVS), regulation of lamp current, dimming operation, and high efficiency. The working principle, performance, and prototype validation are given for the proposed LED driver.