Dear engineers.
I am investigating a failure on our transformers that cause them to short.
What I see so far is that the bobbin is getting expanded by 2-5% after several hours of operation in temperature.
In theory there must be enough space for the windings to expand so the
bobbin is not stressed. But having ~1800 windings it is a chalenge to control the added up forses while winding.
The question is how much expansion is allowed if any???
Specification for the Transformer.
Input voltage range: 50 - 1000V.
Operating frequency: 10kHz.
Flyback step dowm 650V to 15V.
Inductance: 240mH / 11mH.
Windings: 1500 / 320. Shape: E25/13/7
I am investigating a failure on our transformers that cause them to short.
What I see so far is that the bobbin is getting expanded by 2-5% after several hours of operation in temperature.
In theory there must be enough space for the windings to expand so the
bobbin is not stressed. But having ~1800 windings it is a chalenge to control the added up forses while winding.
The question is how much expansion is allowed if any???
Specification for the Transformer.
Input voltage range: 50 - 1000V.
Operating frequency: 10kHz.
Flyback step dowm 650V to 15V.
Inductance: 240mH / 11mH.
Windings: 1500 / 320. Shape: E25/13/7
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