A Novel Single-switch High Power Factor Led Driver Topology With High-frequency Pwm Dimming Capability
In this work, a novel off-line converter with power factor correction (PFC) and pulse-width modulated (PWM) dimming function employing a single active power switch is proposed for LED lighting. The proposed converter is a slightly modified flyback topology which enables the main switch to be used...
| Main Authors: | , , |
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| Formato: | Artigo |
| Idioma: | English |
| Publicado: |
Associação Brasileira de Eletrônica de Potência
2013-02-01
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| Series: | Eletrônica de Potência |
| Subjects: | |
| Acceso en liña: | https://journal.sobraep.org.br/index.php/rep/article/view/389 |
| Summary: | In this work, a novel off-line converter with power factor correction (PFC) and pulse-width modulated (PWM) dimming function employing a single active power switch is proposed for LED lighting. The proposed converter is a slightly modified flyback topology which enables the main switch to be used both for power factor correction and PWM high-frequency dimming with a constant peak on the current through the LEDs, thus conserving chromatic characteristics of emitted light. The proposed control scheme uses duty-cycle to control the light level, while switching frequency is varied along to adjust the input power and keep a constant LED peak current. The converter is able to dim LEDs without losing its PFC characteristics. Mathematical description and experimental results of a prototype with 100 W of peak power fed from 127 V mains voltage are presented in this paper to show feasibility of the novel single-switch driver proposal.
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| ISSN: | 1414-8862 1984-557X |