Patent ID: 8269422
Filing Date: 2012-09-18
Classification: H05B

Abstract:
1. An output controllable frequency modulation electronic ballast, in that an output frequency of a buck DC-DC converter is adjustable for changing pulse widths and duty cycles of voltage and current pulses from an output of the buck DC-DC converter to an lamp body so as to adjust illumination of the lamp body; the ballast comprising: a first stage for converting AC current into DC current and boosting of voltage; a buck DC-DC converter; a transistor of the buck DC-DC converter having an input end which is selected from a gate for MOSFET and a base for a bipolar transistor; and a PWM controller connected between the input end of the buck DC-DC converter and an output end of the lamp body; a frequency controllable oscillator being connected to the PWM controller for providing variable frequency to the PWM controller as a base band signals of the PWM controller; and an oscillation controlling processor being connected to the frequency controller oscillator for generating instructions to change the oscillation frequency of the frequency controller oscillator and thus to adjust the modulation frequency of the output of the PWM controller.