Micro controller based high power factor electronic ballast
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This document discusses the design of a microcontroller-based electronic ballast for supplying metal halide lamps. Electronic ballasts have advantages over traditional magnetic ballasts, but can cause acoustic resonances if not properly designed. The proposed ballast uses a low frequency square wave voltage and current to avoid these resonances. It employs a microcontroller to control the lamp starting, heating, and steady-state operations, which provides flexibility. The experimental results show the ballast achieves high power factor and efficiency. It provides a feasible and reliable solution for driving metal halide lamps.
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Micro controller based high power factor electronic ballast
- 1. MICRO CONTROLLER BASED HIGH POWER FACTOR ELECTRONIC BALLAST TO SUPPLY METAL HALIDE LAMPS By- Niteesh S Shanbog PES1201702421 MTech, EEE 1
- 2. Microcontroller-Based High-Power-Factor Electronic Ballast to Supply Metal Halide Lamps Marco Antonio Dalla Costa, Member, IEEE, José Marcos Alonso Álvarez, Senior Member, IEEE, Jorge García, Member, IEEE, André Luís Kirsten, Associate Member, IEEE, and David Gacio Vaquero, Student Member, IEEE IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 59, NO. 4, APRIL 2012 2
- 3. ELECTRONIC BALLASTS Better than traditional electromagnetic ballasts for High Intensity Discharge (HID) lamps on several counts. The main drawback of Electronic Ballasts is the risk of Acoustic Resonances (AR) rising. 3
- 4. THE PROBLEM OF AR’S AR’s cause the generation of standing pressure waves in the plasma. They can be avoided by using Low Frequency Square Wave voltage and current. 4
- 5. THE CONTROL CIRCUIT Lamp starting - the lamp has very high impedance before ignition and a pulse of approximately 3 kV is necessary to start a cold lamp Lamp Heating -the heating process takes from tens of seconds to minutes. The lamp starts presenting a small impedance that increases as long as the lamp is warmed up. Steady state - after the lamp heating, the lamp reaches the steady state and some parameters (lamp power or current) must be controlled in a closed-loop way. 5
- 7. 7
- 9. CONCLUSION A microcontroller-based control strategy can be implemented for a high-power-factor integrated electronic ballast for MH lamps. The microcontroller provided enough flexibility for the MH lamp start, warming up, steady state, and protections, which are rather complicated tasks. The proposed ballast presented high power factor, high efficiency, feasibility, and reliability. 9
- 10. REFERENCES https://www.doityourself.com/stry/whats-the- difference-between-an-electronic-ballast-and-a- magnetic-ballast https://en.wikipedia.org/wiki/Flyback_converter http://www.edisontechcenter.org/metalhalide.html 10
- 11. THANK YOU! 11