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Optoelectronics/Displays  

35W electronic ballast for HID lamps

Posted: 12 May 2010     Print Version  Bookmark and Share

Keywords:HID lamps  35W electronic ballast  metal halide lamp 

Low-power metal halide lamps are becoming popular as lighting sources in indoor environments like shopping centres or malls, serving as alternatives to more traditional halogen lamps, thanks to their intrinsic higher efficiency, longer lifetime and optimal colour rendering. Until now, electronic circuits supplying HID lamps made use of microcontrollers and complicated topologies. Generally four power switches are used in full-bridge topology, two of which work at high frequency (80-100kHz) in order to regulate the lamp current, while the other two work at low frequency (150-400Hz). This application note describes an analogue solution for a complete ballast circuitry optimised to feed a 35W high intensity discharge (HID) metal halide lamp (MHL), without making use of any microcontroller to regulate and control the lighting output. This circuitry is used on demonstration board STEVAL-ILH002V1. The lamps used for this design are a 35W metal halide lamp CDM-T (Philips) and an HCI-T (Osram).

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