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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
The question is a little ambiguous,
A TV would use around 100 to 150 Vdc which is switched across the primary of the flyback transformer (LOPT) for 20 to 30 us which builds up primary current / magnetic flux in the core. (I = V x T / L)
When the switch (transistor) is opened (turned off) the primary voltage flies up to about 1 kV peak.
The 1 kV peak x (Secondary #turns / Primary #turns) is the typical 25 to 35 kV eht output.
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
It depends on switching time and primary inductance. The built-in primary is built to be fed, as Sulaiman said, 100-150 VDC. Many here like to wind our own so we can use a lower voltage and higher current, though. The built-in primary has to be rated the same as the HOT that switches it, assuming they use the same safety margin, which would again agree with Sulaiman's post (~1kV peak).
I would think that the secondary would fail before the primary, since it is much more sensitive to overvoltage and overcurrent. (Overvoltage being over ~30kV, overcurrent being over 1mA, the 1 mA being a specification for all TV flybacks I've read up on, though many people push this value)
Also I'm not sure about the current capabilities of the primary, but if using the internal one, it may be a concern.
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max. flyback transformer primer volatge??
