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Help me to solve AC current leakage out of the SMPS.

Posted by: papaisou11 on Sat, 06/26/2021

Hello,

Lets discuss about my problem -

I am making a power supply to power Audio instrument having 12V 1.25A rating across the output.
The circuit is attached.

The circuit works fine but when I touch the wire or the equipment that is powered by the SMPS I feed a electrical shock sensation and the neon tester is glowing.

 

What I have done, as shown in the image, I have added a inductor that connectes the earth with the secondary Return and the problem is solved. No shock, not the neon is glowing.

 

But, my problem is, I want to use this in locations, where the earthing will be a problem. How I can rectify this issue?

I want to have the earthing as an option as well with the solution.

 

https://www.power.com/sites/default/files/forum/files/photo.jpg

 

 

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Image the schematic 68.65 KB

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Submitted by PI-ZBDelta on Tue, 06/29/2021

Hi,

This may be due to insufficient isolation between the transformer windings.

Can you include the transformer specifications along with the build diagram?

Submitted by PI-Chloe on Mon, 07/05/2021

Hi papaisou11

Good day! 

Is there a proper isolation between primary circuit and secondary circuit? Meaning is the primary side and secondary side have enough spacing or separation? 

Usually this is cause by the capacitor C4.

   - Capacitor C4 should be a safety capacitor. Please advise if the C4 is a safety capacitor Y1? 

   - Please also advise if C4 is a 0.15nF capacitor based on the schematics. 

Thanks 

 

PI-CHLOE