Electronic ballast component selection and performance, power can be 3W~~~~125W (Netblog Zheng's Law)

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Electronic ballast component selection and performance, power can be 3W~~~~125W (Netblog Zheng's Law) [Copy link]

Electronic ballast component selection and performance
The design of electronic ballast is a major difficulty in the lighting industry. Many manufacturers produce products that are similar to the original, which gives users the phenomenon of "saving energy but not money". In fact, even some factory engineers themselves do not know how to coordinate and improve component performance. A large part of the problem is the poor quality of the ballast. The quality of the ballast is first related to the design of the circuit. The following is my design experience over the past few years, and the use and performance of the main components for your reference.
The following is my own experience. I hope that OSRAM's Ye Ming, GE's Zhang Huidong, (uncle) Zheng Youjun, Professor Yang, Xie Yuezhong, and Pan Yinsheng will give me more advice. Other brothers can do it with a little debugging in the parameters below. Save materials! The following is based on actual power
. 1. Inductance
1.1 Core
EE10: below 10W EE13: below 13W EE16: below 18W EE19: below 24W EE19 thickened, EE20: below 30W EE25, EI25: below 45W EE25 thickened EI28: below 80W EI33: below 110W The power can be 3W~~~~125W
1.2 Gap.
Note that the maximum gap cannot exceed 1/3 of the middle length. Generally, small power is 10W~20w 0.4 30w~40w 0.6 60w~80w 0.8 100w~110w 1.0
1.3 Wire diameter
7W￠: 0.11 7—13W: ￠0.13, 13—20W: ￠0.2, ２０—30W: ￠0.25,
3０—60W: ￠0.11mm×6 strands 60W—80W: ￠0.11mm×10 strands
80W—110W: ￠0.2mm×10 strands You can also consider importing 4.5 times the cathode current as a square 1mm=1A
2. Magnetic
ring Magnetic ring is also called pulse transformer. I mainly use 2.5K: lamps below 7W use ￠8*5*3mm, ３:１3:３. Lamps of 7-20W use ￠10*6*3mm, 3:7:3. Lamps of 20-30W use ￠10*6*5mm 3:5:3
Lamps of 30-80W use ￠10*6*5mm, 3:３:3. Lamps of 80-110W use ￠12*7*5mm, ２:2:２
3. Filter electrolytic
lamps below 7W use 1.5~1.8uF, 7-11W lamps use 1.8~2.7uF, 11-15W lamps use 3.3uF, 15-20W lamps use 6.8uF, 20-30W lamps use 10uF, 30-45W lamps use 15uF, 45-60W lamps use 22uF, 60-80W lamps use 33uF, 80-100W lamps use 47uF, 100-110W lamps use 68uF. The
withstand voltage is 400V~450V. The life of electrolytic ballast is relatively short. You must pay attention to the selection of capacity, leakage current, and high temperature life.
4. Transistor
10W or less: 1300120W or less: 13002, 30W or less: 13003, 55W or less: 13005, 85W or less: 13007, 110W or less: 13009
Considering its amplification factor and switching time, make a good pairing. Transistor 13001 0.1A 13002 1A 13003 2A
should pay attention to whether it meets the transistor standard. The amplification factor is 15~20 20~25 25~30 and can be divided into three grades. The larger the amplification factor, the larger the power.
5. Resistor
transistor emitter resistor below 30W: 1/4W, 1~2Ω, below 80W 1/2W, 0.5~1Ω, below 110W 1W, 0.5Ω
transistor base resistor 6.8~~33Ω,

performance:
transistor CE phase shift capacitor: can absorb high voltage, prevent secondary breakdown, reduce reverse bias,
transistor CE freewheeling diode: avoid transistor reverse breakdown, reduce high-order oscillations in the switch.
Upper transistor CE large resistor: when turned on, provides midpoint voltage, has a direct-through effect, has a discharge effect during work, and has a damping effect on resonance.
Transistor EB diode: avoid transistor EB breakdown, reduce magnetic ring reverse loss
Transistor E resistor: current limiting, reverse protection for transistors.

Let's talk about these first! For the rest, I hope you can read more related books. I am a high school student, and my comprehension ability is not as good as that of you. I can only hint at some things, but not explain them in words. I am still learning. Please believe that academic qualifications do not represent something. Experience comes from hard work and experiments. I hope that you who know a lot about the performance of ballasts can give me more advice. I will definitely be a good apprentice of you.

天雪锦芫

great