| It is well known that the most sensitive load affected by minor voltage fluctuations is the incandescent lamp. This project describes a new method to eliminate the nuisance of light flicker utilizing a Dynamic Phase Controller (DPC). A TRIAC is connected in series with the lamp to perform the phase control function. Adjusting the firing angle of a TRIAC every half cycle, in a manner that keeps the rms value of the resultant voltage waveform of the load constant, eliminates flicker by compensating for voltage variation. The TRIAC is triggered by a microcontroller that determines the required firing angle for each half cycle of line voltage based on the previous compensation error.; In addition, a flicker insensitive light dimmer, based on the prototype of the DPC, was implemented which performs as an excellent flicker suppressor. Unlike the conventional incandescent lamp dimmer that amplifies light flicker while dimming, this new flicker insensitive light dimmer compensates to provide nearly constant illumination under a supply with flicker fluctuations.; To measure the voltage flicker precisely, a virtual flickermeter was built on a PC in accordance with the algorithm of the IEC 61000-4-15 flickermeter standard. Furthermore, the study demonstrates flicker measurement directly via a light meter output for any type of lamps or nominal voltage. |
