معلشي لو كنت هتااقل علي حضرتك يا استاذي osama matar
انا دلوقتي وصلت لشرح الديره الاستندر نفسها ومش هتفرق المهم انه شرح زيها
شوف حضرتك انا قدرت اوصل للشرح بس فيه حجات مش عارف اترجمها بمعنى المصطلحات انا اعرفها ولكن فيهحجات تيهه عني فامحتاجي اني اطلع من الكلام الشرح المجمل والمختصر الي هقدر افهمه واحفظه لو تقدر تفدني ارجوك في استخلاص الشرح من الي انا جبته ده
الديره الاستندر اهه
وده الشرح الي مكتوب عليها ياريت تفدني فيه
[LEFT]
Lamp start
R6, C2 and DIAC mades first pulse to base of transistor Q2 and cause his opening. After start is this section blocked by diode D1. After every opening of Q2 is discharged C2. There is not possible to collect enough energy for reopening of diac. Next are transistors excitated over very small transformer TR1. It consists of ferrite ring with three windings (5 to 10 coils).
Now are filaments powered over capacitor C3 from voltage rises from resonant circuit from L1, TR1, C3 and C6. Than the tube lights up is resonation frequency specified by capacity of C3, because he has much lower capacity than C6. In this moment is voltage on a C3 over 600V in a relation to used tube. During start is peak collector current about 3 to 5 times bigger than during normal operation. When the tube is damaged, there are hazard of transistor destroying.
Normal operation
When the gas is ionisated in a pipe, C3 will be practically shorted and thanks to this frequency goes down and changer is now drived only by C6 and changer generates much lower voltage but enough to keep the light on.
In a normal situation, when transistor opens, that current to TR1 increasing until his core is saturated and next his feedback to base drop away and transistor closes. Now opens second transistor which is excitated by reversly connected windind of TR1 and all process repeats.
Failures
Common failure is broken capacitor C3. it is possible mainly at cheap lamps, where are used cheaper components for lower voltage. Whet the pipe doesn't lights up on time, there are risk of destroying transistors Q1 and Q2 and next resistors R1, R2, R3 and R5. When lamp starts, changer is very overloaded and transistors usually doesn't survive longer temperature overloading. When the pipe serve out, electronics is usually destroyed too.
When the pipe is old, there can be overburned one of filaments and lamp doesn't lights up anymore. Electronics usually survives.
Sometimes can be pipe broken due to internal tension and temperature difference. Most frequently lamp fails, when power on.
Repair of electronics
Repair of electronics usually means change of capacitor C3 if he is brobek. When burns fuse, probably will be damaged transistors Q1, Q2 and resistors R1, R2, R3, R5. You can replace fuse with resistor 0R5. Failures can be multiplied. For example, when is shorted capacitor there can be thermally overloaded transistors and will be destroyed. Best transistors for replacing of original types are MJE13003, but it is not easy to find them. I replaced them with BD129, but they are not available now. There exists other variants like a 2SC2611, 2SC2482, BD128, BD127, but I am not sure if they will be long-life. Original transistors are not available on our market. If doesn't matter size of case TO220, it's possible to use transistors MJE13007.
Mechanical construction
Lamp is usually compounded of two parts. One is plastic cover with holes for pipe and bills. Tube is agglutinated to it.
Second much bigger piece has slots for bills from the inner side. Inside is printed circuit board with components and wires from tube. From the upper side of PCB are wires to top of lamp, where are soldered or stamped to the contact. Both plastic parts are clicked to himself and sometimes glued. Usually you can carefully leverage with a small screwdriver sequently to round to the gap between both plastic pieces for releasing of glue. Next you must leverage more to the opening lamp. For closing of lamp you can only click both plastic pieces to himself. Look at photo of opened lamp.
Reviewing
Most of these compact fluorescent lamps use same or very similar wiring. more expensive lamps use a little complicated wiring with electrode preheating and thanks to it they have longer lifetime. Repairing of these lamps not pay off, because price of cheaper types are very low now and price of human work is much higher. Wiring diagrams originates while repairing of lamps and they are only for study or repair uses. Informations are from retracing of lamps and from sources in a link section. [/LEFT
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وادي اللنك الاصلي للموضوع ومستني تفاعلك وربنا يجازيك كل خير
http://pavouk.org/hw/lamp/en_index.html
الدائرة التي عجز الكثير من المهندسين عن شرحها(سعدوني ارجوكوا)
