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HAIT Journal of Science and Engineering B Volume 2, Issues 5-6, pp. 655-672 © 2005 Holon Academic Institute of Technology | ||||
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Close loop digital control implemented in a microcontroller and used to eliminate acoustic resonances in HID lampsJavier Correa1,*, Mario Ponce2,
Jaime Arau2, Miriam Sánchez1, and | ||||
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1Departamento de Ingeniería Eléctrica y Electrónica, Instituto Tecnológico de Morelia, Morelia, C.P. 58120, Mexico 2Departamento de Electrónica, Centro Nacional de Investigación y Desarrollo Tecnológico-CENIDET P.O. Box 5-164, C.P. 62050 Cuernavaca, Mexico 3Departamento de Ingeniería Electrónica, Instituto Tecnológico de Celaya, Celaya, C.P. 58120, Mexico *Corresponding author: jcorrea@itmorelia.edu.mx Received 1 March 2005, accepted 7 June 2005 | ||||
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A closed loop digital control to eliminate acoustic resonances (AR) in the electronic ballast for high intensity discharge lamps is proposed in this paper. The system senses the AR intensity and a microcontroller compares this signal with a reference level in order to apply different frequency modulation patterns to reduce the AR intensity below the reference level value. The use of different frequency modulation patterns allows avoiding the AR intensity due to changes in the lamp eigenfrequencies, ambient temperature and the lamp aging. | ||||
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