PENGATUR INTENSITAS CAHAYA LAMPU FLUORESCENT JENIS T8 SECARA DIGITAL DENGAN ANTAR MUKA RS 485

This research aims to design and implements the electronic ballast for fluorescent lamp with power factor > 0,9, THDi less then 10% and more efficien than elektromagnetic ballast. This thesis focuses on controlling the intensity of fluorescent lamp T8 using frequency modulation switching which is...

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Bibliographic Details
Main Authors: , Sihono, , Dr. Eka Firmansyah ST. MT.
Format: Thesis
Published: [Yogyakarta] : Universitas Gadjah Mada 2012
Subjects:
ETD
Description
Summary:This research aims to design and implements the electronic ballast for fluorescent lamp with power factor > 0,9, THDi less then 10% and more efficien than elektromagnetic ballast. This thesis focuses on controlling the intensity of fluorescent lamp T8 using frequency modulation switching which is utilizing an integrated circuit (IC) L6574. An active power factor correction (PFC) based on IC L6562 is adopted to reduce the generated total harmonic distortion (THDi) signal below 10% with power factor bigger than 0.9. The dimmer is controlled digitally using microcontroller which acts as a command translator which converts the digital ASCII code into its corresponding analog output of 0 to 10 Volts using PWM method. Data communication between dimmer system and PC is performed by a wire-based serial communication RS485 system. The experimental results shows that electronic dimmer can adequately adjust the light intensity from 10 to 100%, for light intensity 100% generated THDi 10,8% with power factor more than 0.9. The electronic dimmer, which has an efficacy of 5.67 lm/W, is bigger than that of the electromagnetic ballast, which has an efficacy of 3.9 lm/Watt. From these results, it can be concluded that the electronic dimmer performs better than the electromagnetic ballast. Also, the light intensity using the electronic dimmer can be controlled using computer or digital equipment system.