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A three‐leg resonant converter for two output LED lighting application with independent control
Author(s) -
Ch Kasi Ramakrishnareddy,
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.2632
Subject(s) - duty cycle , pulse width modulation , led lamp , rlc circuit , resonant converter , modulation (music) , dimmer , voltage , power (physics) , electronic circuit , diode , topology (electrical circuits) , pulse frequency modulation , light emitting diode , series (stratigraphy) , control theory (sociology) , electronic engineering , engineering , electrical engineering , physics , converters , pulse (music) , control (management) , computer science , capacitor , pulse amplitude modulation , acoustics , paleontology , quantum mechanics , artificial intelligence , biology
Summary A three‐leg resonant converter is proposed to drive two light emitting diode (LED) lamps of different power ratings. This may be required when both main and local lighting are essential. The proposed converter is operated simultaneously at two different frequencies. Two series resonant circuits are used to allow two different frequency currents. Each lamp is powered through a series resonant circuit and is controlled independently. LED lamp currents are regulated at the desired operating current by using phase‐modulation control and asymmetrical duty ratio control. In addition, pulse‐width modulation (PWM) dimming control is implemented for two LED lamps independently. The proposed topology has advantages of zero‐voltage switching (ZVS), regulation of lamp currents, independent illumination control, and high efficiency. A 126‐W prototype has been developed experimentally to confirm its working principle, performance, and validity.