밸러스트 시스템

Ballast system

Abstract

PURPOSE: A ballast system is provided to improve the power factor and enlarge the lifetime of a fluorescence lamp by combining a control circuit and a power-factor improvement circuit and ensuring the stable start. CONSTITUTION: A power supplying unit(200) rectifies an AC(Alternating Current) power to output a predetermined DC(Direct Current) voltage. A stabilization detecting unit(300) compares the divided DC voltage with a reference voltage to detect a state of which the DC voltage is stabilized. The stabilized DC voltage is oscillated at a predetermined frequency according to an operation mode. A ballast control unit(110') compares the oscillated signal to output a driving signal. The stabilization detecting unit(300) includes a comparator(310) for comparing the DC voltage with the reference voltage, a latch circuit(320) for latching the output of the comparator(310) and an input of a UVLO(Under Voltage Lock-out) signal, and a lock-out unit(330) for performing a lock-out operation on the driving signal according to the output of the latch circuit(320).
본 발명은 역률개선기능을 가지는 밸러스트 시스템관한 것으로, 교류전원을 정류하여 역률개선회로에 의해 역률이 개선된 소정의 직류전압을 출력하는 전원공급부와, 분할된 직류전압을 기준전압과 비교하여 직류전압이 안정화되었는지를 검출하는 안정화 검출부와, 안정화검출부의 출력에 따라 직류전압이 안정화된 후에 동작모드에 따라 소정의 주파수로 발진하고, 발진된 신호를 비교하여 구동신호를 출력하는 밸러스트 제어부를 구비한 것을 특징으로 한다.

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