Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Testing isolation in SMPS transformers

Status
Not open for further replies.
E

eem2am

Banned
Joined
Jun 22, 2008
Messages
1,179
Helped
37
Reputation
74
Reaction score
24
Trophy points
1,318
Activity points
0
hello.

For 230VAC input , offline flyback transformers (fully isolated), how do you test to see if the transformer provides the necessary degree of isolation between primary and secondary?
 

Normally a "flash tester" is used - a small variac driving a stepup Tx with an output up to 4kV AC and a shut off ckt to disconnect the o/p if the current exceeds 5mA (for example) on the o/p, connect across the pri - sec windings
Regards, Orson Cart.
 
  • Like
Reactions: eem2am

    E

    eem2am

    Points: 2
    Helpful Answer Positive Rating
Hi,

I am wondering why it needs to be AC?

Why not just connect the equipment to a DC voltage at the same value as the peak of the AC?
 

It doesn't always have to be AC, but AC hipot testers are easier to make (just a big step up transformer and a variac) and are cheaper. Hipot testing with AC is usually sufficient, but sometimes testing with DC may be a good idea.
 
  • Like
Reactions: eem2am

    E

    eem2am

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top