China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

Working principle of electronic ballast:

When the lamp current is increased, the working voltage of the lamp tube drop, but supply voltage will not be decreased more of this voltage applied to the lamp tube will make the lamp current rise further, so the cycle, eventually burned out lamp or lamp extinguished, so to make the lamp works normally, should match to town flow components, used to limit and stabilize the lamp current. This limiting device is called a ballast. At present, there are two kinds of ballast for gas discharge lamps. the ballast circuit operating characteristic curve as shown in Figure gas discharge lamp in the AC power supply work, gas or metal vapor discharge characteristics depending on the frequency of the alternating current and the town flow element type. Gas discharge lamp,50Hz/60Hz power supply, the impedance of the lamp during the entire AC power supply cycle has been constantly changing, resulting in a non sinusoidal voltage and current waveforms, resulting in a harmonic component. The working frequency of the gas discharge lamp is about.In 1kHz, the ionization state of the lamp is not changing with the working current of the lamp, thus forming a nearly constant plasma density and lamp impedance in the whole working week.

V-I features tend to be linear, and the distortion of the lamp current is reduced, and the operating frequency of the lamp is
50Hz power supply when the luminous efficiency of the comparison curve as shown in Figure 6 can be seen, when the gas discharge lamp AC power supply frequency is greater than 20kHz, fluorescent light fixture luminous efficiency ratio Luminous efficiency 50Hz AC power supply when the fluorescent lamp is high, according to statistics can be improved 10%~20%, at the same time, the fluorescent lamp works in the high frequency AC power supply state, it can effectively overcome the fluorescent phenomenon of the fluorescent lamp. This is also a high frequency AC electronic ballast with respect to one of the advantages of magnetic ballast due to high frequency AC electronic ballast using high-frequency switching converter circuit realization of ballast, with no flicker, high efficiency, volume of filial piety, light quality, dimming, without the use of a series of advantages large amounts of copper and silicon steel materials, so since the 1970s, high-frequency AC electronic ballast for a published, by the welcome the majority of users.