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70997 2009 年 02 月 08 日 17:03 Reading (loading. ..) Comments (0) Category: Personal Diary
In order to the fluorescent lamp, germicidal lamp work, you must meet three conditions:
a, the filament preheat current or filament current
b,
pandora uk, high-voltage start
c, restricting the inductor current
ballast works:
closed circuit when the switch is 220V 50HZ AC power applied, current flows through the ballast, the lamp filament to the filament heating starter (starter is the beginning broken, due to pressure from an AC voltage greater than 190V or more, making the jump starter bubble of gas within the arc discharge, making the dual-metal heat distortion, the two electrodes close together to form a pathway to the filament heating ),
pandora jewellery, when the starter of the two electrodes close together, because there is no arc discharge, double-metal cooling, separate poles, due to the inductive magnetic ballast, when the circuit is suddenly interrupted, in the light ends will have duration of approximately 1ms The 600V-1500V pulse voltage, the voltage value depends on the exact type of light, in the case of discharge,
pandora necklaces, the voltage across the lamp down immediately, this time the one hand, the lamp ballast to limit current role, on the other hand the power supply voltage and the lamp 55 between the operating current. -65. Phase difference, thereby maintaining the lamp voltage of the second start, so that light can be more stable employment.
as simple inductive ballast, long life, as with the work of the first fluorescent lamp ballasts, and its market share is still relatively large,
pandora beads, but, due to its low power factor, low voltage start poor performance, heavy energy consumption, strobe, and many other shortcomings,
pandora sale, its market is slowly being replaced by electronic ballasts, magnetic ballasts energy loss: 40W (lamp power) +10 W (self-heating loss magnetic ballasts ) is equal to the total power consumption for the whole set of lamps 50W.
electronic ballast works:
electronic ballast is a frequency to high frequency AC power into AC power converter, the basic working principle is:
frequency power through radio frequency interference (RFI) filter,
pandora charms, full wave rectification and passive (or active) power factor correction (PPFC or APFC), the changes to the DC power supply. Through the DC / AC converter, the output 20K-100KHZ high frequency AC power, and the lights added to the LC series resonant circuit connected heating filament, while the resonant capacitor to generate high pressure, added to the tube ends, but the lamp ; discharge nature, often add various protection circuits, such as abnormal protection, surge voltage and current protection, temperature protection and so on.
electronic ballasts Category:
A, according to installation mode can be divided into:
a, stand-b, built-in c, Integral
B, according to the performance characteristics can be divided into:
a, ordinary type b, high power factor type c, high-performance type d, e cost-effective type , adjustable light-based top-five
ballast with electronic ballast comparison:
serial type harmonic content of the third harmonic power factor lamp current crest than the performance characteristics of
1. common type 0.6 ≥ 120% 90% 1.4 ~ 1.6 high frequency so that a small, light, a power-saving features
2. high power factor type level ≥ 0.9 ≤ H 30% ≤ 18% 1.7 ~ 2.1 with passive filtering and anomaly protection
3. high-performance electronic ballasts L level ≥ 0.95 ≤ 20% ≤ 10% 1.4 ~ 1.7 a perfect protection function, EMC
4. high-cost electronic ballasts L level ≥ 0.97 ≤ 10% ≤ 5% 1.4 ~ 1.7 with integrated circuit design technology and the constant power, voltage fluctuations illumination of small
5. ; dimmable electronic ballasts ≥ 0.96 ≤ 10% ≤ 5% ≤ 1.7 with integrated technology and active variable frequency resonant electronic ballast technology
advantages:
1) Energy Conservation: power loss electronic ballast itself only about 40% of ballast, and fluorescent lamps in the high frequency of around 30KHZ, the luminous efficiency will increase 20%, working current of only about 40% of the inductor and can at low temperatures , low start and work.
2) No flash: lamp at around 30KHZ work, light stability, the human eye can not feel
3) No noise: a quiet environment conducive to work and study.
4) Lamp life: no starter, the impact will not be repeated, blinking, will not make premature lamp black, a start, reducing maintenance and replacement of the starter and lamp workload.
5) high power factor, reduce reactive loss and improve the effective capacity of power supply equipment utilization, reduce line losses.