MingHe ZXY6005S Programmable Power Supply Question

[tmhobadcap]

I got this power supply from a friend. I found it is somewhat different from other power supply. But I could not find the manufacturer's website and so I would like to post my question here to see if someone can clear my query.

When I use my other power supply to charge my 18650 lithium ion cell, there is always a charging current going through when the power supply is at a higher voltage than the voltage of the 18650 cell, even the difference is very slight. For example, my cell is at 3.75V, and I set the power supply to 3.8V, I can see that the power supply is charging the cell at about 50mA.
But when I do the same with the captioned power supply, there is no current going through the cell. (The display of the captioned power supply is capable to show current to 0.001mA). I have to increase the voltage of the power supply up to 4.0V before I can see current going through the cell.

Is there something wrong with this power supply or just I have not set the power supply properly?

[FrozenHaxor]

Re: MingHe ZXY6005S Programmable Power Supply Question

Measure the voltage and current with a multimeter. Simple way to tell if the power supply display is lying to you.

[tmhobadcap]

Re: MingHe ZXY6005S Programmable Power Supply Question

Measure the voltage and current with a multimeter. Simple way to tell if the power supply display is lying to you.

I have done that. The power supply display is correct.

[sam_sam_sam]

Re: MingHe ZXY6005S Programmable Power Supply Question

Is there something wrong with this power supply or just I have not set the power supply properly?

This is a great question

Is there a way to see what under neath the display because I have a feeling that it has some kind of micro controller

You are going to have to trace from where you hook up the battery terminals and see where the voltage goes and how it gets back to the micro controller ( or it could go to a analog to digital converter ic chip if you are lucky to have this setup might be better in that it might be easier to repair maybe if this is the case )

You better hope that the input to the micro controller are not fried because sometimes this happens

[stj]

Re: MingHe ZXY6005S Programmable Power Supply Question

it is a computer, there is a serial port on the left.

[tmhobadcap]

Re: MingHe ZXY6005S Programmable Power Supply Question

This is a great question

Is there a way to see what under neath the display because I have a feeling that it has some kind of micro controller

You are going to have to trace from where you hook up the battery terminals and see where the voltage goes and how it gets back to the micro controller ( or it could go to a analog to digital converter ic chip if you are lucky to have this setup might be better in that it might be easier to repair maybe if this is the case )

You better hope that the input to the micro controller are not fried because sometimes this happens

Attached please find the underside of the display.
Attached please also find the user manual I found from the internet.
Also, please note it is normal in powering a 12V fan when compared with my other power supply.