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 bo...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2013 |
| País: | Brasil |
| Institución: | Associação Brasileira de Eletrônica de Potência (SOBRAEP) |
| Repositorio: | Eletrônica de Potência (Online) |
| Idioma: | inglés |
| OAI Identifier: | oai:ojs2.journal.sobraep.org.br:article/389 |
| Acceso en línea: | https://journal.sobraep.org.br/index.php/rep/article/view/389 |
| Access Level: | acceso abierto |
| Palabra clave: | LED Dimming Off-line LED Drivers Power Factor Correction Single-switch LED Driver |
| Sumario: | 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. |
|---|