An electronic ballast is described that uses fewer parts and costs less than conventioal ballast, which require separate switching element and control units for the half-bridge inverter and power-factor-correction (PFC) circuits because these circuits operate independently. In this paper, the operation of an electronic ballast in which the switching element of the half-bridge inverter works as a buck-boost converter has been analyzed and harmonic components that an input current included is calculated theoretically. The proposed ballast reduced the harmonics component in the input current to below by IEC Standard 61000-3-2 for Class C, because the amplitude of a sine wave is kept than 2.6 times of the amplitude of a rectangular wave.
展开▼
