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In this paper, a digital addressable lighting interface (DALI) protocol is studied and applied to a Light Emitting Diode (LED) lighting system. The DALI protocol was introduced and the dimmable LED drivers were realized. The user interface program in this system was developed by using the Microsoft Visual C#. Also, an USB-DALI conversion bridge circuit was built for communication between the computer...
In this paper, a TRIAC dimmable controller for quasi-resonant flyback LED driver is realized. Nowadays, many countries take effort to save energy. Because lighting system takes part of approximately 20% of world energy consumption, by replacing the traditional incandescent bulbs with light-emitting-diode (LEDs), electrical energy can be saved significantly. TRIAC dimmer is commonly used for traditional...
In this paper a two-stage high frequency AC-LED driver is designed and studied. The front-stage is a boost power-factor correction (PFC) circuit and the rear-stage is a halfbridge series resonant inverter. The lighting characteristics of high frequency AC voltage driving LEDs, and the effect of LED to half-bridge resonant circuit are discussed. The proposed design uses the digital dimming control...
This paper proposes an electronic ballast circuit for fluorescent lamps with low lighting flicker. The electronic ballast with constant-frequency control, in which the DC-bus voltage is fed by a power-factor corrector, has a low-frequency ripple, which can cause lighting flickers in fluorescent lamps. Precise image-detecting systems require lighting sources (such as fluorescent lamps) with low levels...
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