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發表於 2012-6-17 15:10:18
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本帖最後由 huang22 於 2012-6-18 01:54 PM 編輯
查一下與DIAC (DB3)相接的電阻(圖中R1)的值(數百K歐姆?)是否過大,
換掉該電阻應OK。電容(圖中C2)也可檢查更換一下。
3M,58度LAMP
TR1為N-ch IRF830B,
R1=1M; C2= 104
在標題如下的PDF檔，有談到.....
APPLICATION NOTE
ELECTRONIC FLUORESCENT LAMP BALLAST
啟動:
3.1.1 Starting the oscillation
Resistor R1, capacitor C2 and Diac D2 form the first
base current pulse for TR2 to start the oscillation.
After start-up, this generator is made inoperative by
diode D1 (this diode prevents the voltage across the
diac from becoming high enough to bias the device
on), and the circuit is maintained in oscillation by
feedback to the gates of the transistors from the
output circuit via the transformer T1.
啟動
電流
應同好要求:該PDF文件
CFLB.pdf
(72.64 KB, 下載次數: 285)
好像有個小晶體MOSFET，會故障，導致電源電壓無法送到點燈迴路。
忘了好像是N-CH或P-CH，同事自己修的，當時手邊的MOSFET是方形稍大的，更換後OK。
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發表於 2012-5-15 14:49:01
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