Author Topic: Half bridge protection measures  (Read 1624 times)

Offline John123

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Re: Half bridge protection measures
« Reply #20 on: March 11, 2020, 07:53:28 AM »
Is the flyback getting warm? Maybe that 30 watts idle is from a shorted turn after the incident, secondary can internally flashover and use of enameled coated wire for primary can sometimes short to the core at the corners (core electrically conducts like a resistor in the kilo ohm range).
« Last Edit: March 11, 2020, 07:57:34 AM by John123 »

Offline Sk1ppy

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Re: Half bridge protection measures
« Reply #21 on: March 11, 2020, 07:56:17 AM »
That may be a possibility - the primary coil did get rather warm, and my other flyback doesn't get nearly as hot

Offline John123

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Re: Half bridge protection measures
« Reply #22 on: March 11, 2020, 07:58:04 AM »
What sort of wire are you using for the primary coil? Enameled magnet wire has a habit of scratching and shorting to the resistive but conductive ferrite core.

Just came across this https://4hv.org/e107_plugins/forum/forum_viewtopic.php?p=1&id=173600#post-173600
Quote
Well , although that seems to work good enough for DC, as most of us know, once flyback diodes are broken and the output is AC, corona quickly damages the innards of the flyback and it mysteriously heats up and reduces in output, unloaded!.
« Last Edit: March 11, 2020, 08:49:58 AM by John123 »

Offline Sk1ppy

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Re: Half bridge protection measures
« Reply #23 on: March 12, 2020, 05:06:52 AM »
I'm just using regular plastic insulated hookup wire, somewhere around 20awg.  I had about 10 turns on the primary.

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Re: Half bridge protection measures
« Reply #23 on: March 12, 2020, 05:06:52 AM »

 


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