An improved electronic transformer for low power halogen cycle lamps

Halogen cycle lamps are being used for outdoor and indoor lighting. For indoor lighting, low power halogen cycle lamps are used. When lamp power is below 50 W, it is not possible to connect these lamps directly to power lines because they need a low input voltage, between 6 V and 24 V. Traditional supply equipment for low power halogen lamps are 50/60 Hz transformers, but they have large size and weight. A low cost and reliable high frequency supply system, an electronic power transformer, for low power halogen cycle lamps based on a self-oscillating half bridge inverter is described in this paper. Compared with a 50 Hz transformer, weight and size have been minimized. Moreover a high power factor, more than 0.9, has been achieved, and the circuit is both reliable and flexible