Re: Origin of "Flyback"

Mr. Goldwasser has changed the line "polarity by the HOT turning off and damper
diode turning on during this flyback or retrace period." in the FAQ to "polarity
by the HOT turning off during the flyback or retrace period." in answer to my
questioning the part about the damper turning on. The damper turns on AFTER
retrace and is on (in the case of a raster monitor) from the left edge of the
scan to the center of the screen. By the time you get to the center of the
screen the horizontal output transistor has again turned on. Since it is in
parallel with the damper it really doesn't matter which is turned on during the
left half of scan.

His TV FAQ was more accurately worded than the monitor FAQ was. It was nice of
him to reword the monitor FAQ.

John Mehrtens wrote:

> btw, the first part (re: retrace period & damper diode switch time) is
> explained earlier in the same FAQ, and "not generally" is the key word in
> the second paragraph -- he explains that in other parts of the FAQ. Have
> you read through all the FAQs?
>
> If one calls a DC-DC convertor or off-line switching power supply a 'flyback
> power supply' then that holds true... I for one call that particular
> portion of the power supply the "flyback portion", but others take the
> entire supply as a whole and don't call it that. To each their own; that's
> why the phrase '...not generally called...' is there.
>
> Makes it all come together quite well! heheh
>
> Cheers,
>
> John
>
> > polarity by the HOT turning off and damper diode turning on during this
> > flyback or retrace period.
>
> WRONG! The damper diode doesn't turn on until AFTER retrace.
>
> > high frequency transformers are not generally called flyback transformers.
>
> Once again wrong. A transformer used in a flyback power supply is indeed
> called
> a flyback transformer. One of the main differences in a coil or transformer
> used in a flyback regulator circuit is a larger core. This is because the
> core
> has to be able to store the TOTAL output power of the circuit. A forward
> switching power supply only has to store part of the power. And the core in
> a
> non-flyback transformer really doesn't have to store any of the power.

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