Hi There,
Seem like I need to study a lot more about transformer. This transformer was there for a while and I happen to assign to look at the issue. I think we first get this transformer, we only provide them electrical spec. and ask the transformer supplier to design the transformer for us...
Folks,
I just got some time to take some measurements, photo and upload it here.
Roughly, there seem to be significant different in coreloss value between the good and bad transformer measured using the RLC meter.
From the external structure, I can't really tell what the different between...
Thanks so much for every of the answer. They're all very helpful and educational. Seem like I'll have a lot of stuffs to look at. I had asked them to shipped me some of the good and bad transformer(from China factory). I should be getting them in a few days. I'll do some more investigation and...
Thanks a lot Berkeman for quick reply.
Here are some more details.
This is actually a linear power supply similar to an off the shelf DC adaptor. It just that we buy a bare transformer and build the DC power supply on our own to include in our product.
So, in this unit, it only contain...
Hi Folks,
We've been use one of the linear transformer in our product for a while and suddenly in one lot the transformer has failed the exciting current test limit at higher votage(132V).
This is a 120AC/20VAC@750mA linear transformer. Supplier is trying to figure out what went wrong but...