Hi everyone,

I want to know how to check power supply leakage.Because my application is AC load. In normal condition, there is no DC voltage and DC current at load side. Now, I am getting a few DC current at load side. So, I am suspicious with the power supply. I am using meanwell power supply made in china. And I think some leakage in power supply.

Any other suggestions from you, please!

Thanks
Yin Min

 

I am using meanwell power supply made in china

Can you post its specification/rating/model?

 

Hi Alec_t,

Two Power Supplies:
Model: SP-450-48 and SE-350-48.

Thanks.

 

I don't understand your question. Both the power supplies are 48 volts DC output yet you say that you want them to supply an AC load. can you give more details of the nature of the load that you wish to power from these power supplies.

Les.

 

This method of ground leakage testing is used for laboratory and production testing.


Measure the voltage across the 1500 ohm resistor and divide by 1500 ohms to find the ground leakage current.Note: The lower trace is the 1500 ohm shunt's return to earth, not neutral.

Source:
https://www.chromausa.com/applications/leakage-current-test/

 

I don't understand your question. Both the power supplies are 48 volts DC output yet you say that you want them to supply an AC load. can you give more details of the nature of the load that you wish to power from these power supplies.

Les.

Hi Les,

The following is my block diagram of system. In normal condition, there should not be DC current at load side. Now, I am getting DC current and AC current at load side. After I changed another power supply ( I mean different model and different rating of Meanwell power supply), there is no more DC current. So, I concluded that it is power supply fault. Now, I want to remove this DC current without changing another power supply.
Is there any solution to remove this unwanted DC current, please?? Now, I am trying to add on another filter circuit at the power supply output side. is this the right way to solve this problem?


Fig.1. Normal Condition

Fig.2. Faulty Condition


Thanks,
Yin Min

 

Your original description was confusing as the term leakage normally refers leakage from the input supply and the case of the power supply or it's output (If the output is floating.) (As described by DickCappels in post #5) You also did not mention the MOSFET driving circuit between the power supply output and the load. I think you need to give FULL details of the MOSFET driving circuit (Including the schematic.) so we can try to understand what is happening.

Les.

 

Your original description was confusing as the term leakage normally refers leakage from the input supply and the case of the power supply or it's output (If the output is floating. (As described by DickCappels in post #5 You also did not mention the MOSFET driving circuit between the power supply output and the load. I think you need to give FULL details of the MOSFET driving circuit (Including the schematic.) so we can try to understand what is happening.

Les.

Okay.