Operation of a valve line output stage
Please could someone explain what is meant by the term efficiency diode feeding the LOPT?
Is this just another term for a rectifier or is it performing another function? Thanks in advance Christian. |
Operation of a valve line output stage
The boost diode is used to recover energy from the line output transformer during flyback. It makes the line ouput stage more efficient (I'll let the experts explain how - then I might learn something as well!).
Jim. |
Operation of a valve line output stage
Thanks Jim
Would I be right in considering the capacitor is there to correct the power factor of the inductive circuit? Thanks Christian |
Operation of a valve line output stage
1 Attachment(s)
OK - here we go, Chris (and Jim :) ). This will be a bit long, so you may fall asleep. Keep away from the PY top cap. :o
Assuming that the LOP stage is already running, and the spot is in the RH side of the raster, and the combined scan coils/width control/LOPTx are treated as a single inductor.
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Operation of a valve line output stage
Could you please clear up some of the terminology, is this just a naming convention related to this type of television circuit?
CStray PL PY Many Thanks. |
Operation of a valve line output stage
Hi Chris,
the PL is the line output valve V10 (PL81), the PY is the effieciency diode V12 (PY81). There will be two types of Cstray. Cstray is stray capacitance, ie. there is not actually a physiscal capacitor there. Remember that whenever you have two wires near each other or a wire near a metal chassis there will be stray capacitance between them. The line output transfomer will have stray capacitance across the windings and also stray capactitance between the windings and the surrounding metal work/coil core material etc.. The line output transformer (T2 in this case) can be called LOP transformer, LOPT, LOPTy, HOPT (horizontal output transformer) or the flyback transformer. These are all the same thing. Cheers Andy |
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