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haricool
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Join Date: Oct 2008
Location: India
Posts: 76

How the wire get short circuited after reflow?

10/04/2008 12:45 AM

Hi,

I'm working in automobile concern as a quality engineer.

One of our SMD transformer didn't pass through the dielectric test(1.5KV, 60s, 100mA trip current) after reflow condition(250°c/ 30s)

How is this happen? Is the insulation of wire(P 155 grade2) get weaken during reflow or any other reason?

If you need more details,ask me .

Need your guidance to come out of this issue.

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Anonymous Poster
#1

Re: How the wire get short circuited after reflow?

10/05/2008 12:48 AM

If the reflow is heated with induction current heating the eddy currents in the coil during the heating cycle probably did in the coils.
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schorschimi
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Join Date: Dec 2007
Location: Germany
Posts: 9
#2

Re: How the wire get short circuited after reflow?

10/05/2008 8:04 AM

Before guessing I would like to get the following information:

Reflow heating source? IR, convection or other?

coil (bobbin) material and thickness?

Breakdown voltage before reflow?

Schorschmi

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