C. Aguilar–Castillo*¹, C.D. García–Beltrán¹, C. Morcillo–Herrera²

¹ Centro Nacional de Investigación y Desarrollo Tecnológico Interior Internado Palmira SN Cuernavaca, Morelos, México. *E–mail: aguilar@cenidet.edu.mx

² Universidad Tecnológica Metropolitana Calle 115 No. 404, Colonia Santa Rosa Mérida, Yucatán, México.

ABSTRACT

This paper presents a digitally controlled integrated electronic ballast with dimming and power factor correction features. The control circuit is based on a low–cost PIC16C71 microcontroller where the different strategies for energy saving have been implemented. The ballast is operating in closed loop achieving tight lamp current regulation through a digital Proportional–Integral algorithm. The integrated power stage is based on a frequency–controlled single–switch boost rectifier plus a half–bridge series resonant parallel loaded inverter sharing one power switch. The single–switch boost rectifier works in discontinuous inductor current mode with automatic power factor correction. Detailed analysis of the power stages and experimental results using 42–watt electronic ballast are presented.

Keywords: Electronic ballast, lighting control, active power factor correction, and digital control.

RESUMEN

Este artículo presenta un balastro electrónico integrado controlado digitalmente con características de control de intensidad luminosa y corrección del factor de potencia. El circuito de control está implementado en un micro–controlador de bajo costo (PIC16C71), en donde se han implementado distintas estrategias de ahorro de energía. El balastro opera en lazo cerrado con control preciso de la corriente de la lámpara usando para ello un algoritmo de control proporcional–integral. La etapa de potencia está basada en rectificador Boost integrado a un convertidor resonante serie en medio puente, compartiendo un interruptor de potencia. El rectificador Boost opera con corriente discontinua y por tanto obtiene corrección del factor de potencia de manera automática. El artículo presenta el análisis detallado de un balastro electrónico para una lámpara de 42 watts, incluyendo resultados experimentales.

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