EEVblog #659 – Medical Plugpack Teardown

What’s inside an IEC60601-1 medical class 5V mains DC-DC plugpack?
What is the difference between PCB clearance and creepage?
A German FRIWO 5V FW7555M/05 brand medical grade isolation unit vs a cheap Wun Hung Lo consumer brand.
Also a comparative look at transformer construction.

Datasheets & Links:
Rubycon Caps
CD 263 Caps.
Vishay Optocouplers

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  1. That winding around the transformer is for EMI-compliance, it is the shielding of the core. I have never seen this kind of wire, ususally copper foil is used (e.g. in ATX PSUs). Maybe they “did the homework” in this case. Dave, as I remember, you did a teardown where this kind of pulse-transformers had nice shielding. I have found this in the teardown of the Marconi RF Gen.

  2. Jianghai caps are Chinese. But they have a cooperation/licence with Hitachi AIC.
    Not one hung low

  3. Poland won against Australia in volleyball !!!
    Greetings to the quarterback from Australia !!! Thomas Edgar !!! not bad !!!

  4. So in order to reduce EMI, it common to place a capacitor between between the main ac side and the isolated 2nd side?

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