New FNIRSI power supply.

[mawyatt]

Measure the resistance of the SMD, if it's very low then likely fuses.

The case looks like the same case that the NanoVNA SAA-2N comes with, handy nice little hard shell case.

Best

[Fungus]

two unknown surface mount components in their tape. 

Could be spare fuses.

In tiny SMD?

Yes, check inside the power supply if there are similar parts on the PCB at input or output.

I dunno. That doesn't seem very user friendly. 

Quick first inspection: I manages to get 19.95V out of my Xiaomi phone's charger. It seems to work. The user interface is bad, the beep on every button press or knob click will have to go.

There's a CH340 (USB-to-serial) chip right where the USB connector is on the PCB. That must be the communication interface. There's a four pin header right next to it but it isn't labelled like a serial port. Looks more like I2C.

[Kean]

Included accessories: A zippered case (which I'll probably repurpose), a USB cable, five rubber feet (one spare?), a PCB with screw terminals on the top and two big diodes on the bottom for "battery charging", and ... two unknown surface mount components in their tape. 

Most likely replacement fuses.  I don't recall seeing these in my package, probably missed them being so small.  I probably don't have similar rated ones in stock.
See the green output fuse F1 hiding under the sense resistor in attached photo inside my unit.

[Fungus]

See the green output fuse F1 hiding under the sense resistor in attached photo inside my unit.

I put my little tape package next to that and it looks like you're right!

[Fungus]

The case looks like the same case that the NanoVNA SAA-2N comes with, handy nice little hard shell case.

Yep, the case is nice. You can remove just the top set of screws and the top half lifts off for easy access.

[mawyatt]

The case looks like the same case that the NanoVNA SAA-2N comes with, handy nice little hard shell case.

Yep, the case is nice. You can remove just the top set of screws and the top half lifts off for easy access.

Sorry, I meant the carrying case not the actual PS case. The PS case looks like an extruded Al case with PCB end covers.

Best,

[Fungus]

Sorry, I meant the carrying case not the actual PS case. The PS case looks like an extruded Al case with PCB end covers.

Both. Both are nice. 

[Fungus]

I just tried this power supply with my Xiaomi power bank. I was thinking "Portable power supply!".

It powers on OK, but ... it failed to negotiate more than 5V input from the power bank which means only 4.1V output into a load. 

I know my power bank can do more than that but not with the FNIRSI. Maybe it would work if you find the right one. 

[HKJ]

I just tried this power supply with my Xiaomi power bank. I was thinking "Portable power supply!".

It powers on OK, but ... it failed to negotiate more than 5V input from the power bank which means only 4.1V output into a load. 

I know my power bank can do more than that but not with the FNIRSI. Maybe it would work if you find the right one. 

The FNIRSI uses USB-C PD, this means you must use a USB-C cable and cannot have any old style USB connection involved as they do not support more than 5V (Except with non USB approved protocols  like QC).

[Fungus]

The FNIRSI uses USB-C PD, this means you must use a USB-C cable and cannot have any old style USB connection involved as they do not support more than 5V (Except with non USB approved protocols  like QC).

I know, I've been powering it using a phone charger. It negotiates 20V from the charger and works just fine.

My phone charges at much more than 5V if I plug my phone into that power bank but the FNIRSI doesn't like it. 

[Fungus]

I was just throwing thous out there. If you need a portable power supply then this thing could work nicely if you find a power bank with better support for USB C power delivery.

[jice]

Here is the hacked protocol: https://github.com/jcheger/fnirsi-dc580-protocol

[tai]

Great! I tested the serial port on my new FNIRSI DC-6006L power supply, and can confirm that it also follows the same protocol except that it first responds with "KB" instead of "MB". Other than that, it seems the protocol is compatible.

[tai]

Based on the work for DC-580, I wrote a CLI tool to control similar model, DC6006L.
https://github.com/tai/dc6006l/

I can't comment on DC-580, but serial port output from DC6006L is a mess as its output format is a mixture of different frames that are quite identical and don't give much information on what it contains. It's also not compatible with DC-580. So far, it works for me, but your milage may vary.

[Chance92]

Interested in how much switching noise is on the output unloaded and loaded of the DC-6006L. Much appreciated if someone could post a scope trace of this.

I only have a 10MHz scope and a 20V PD charger. For what it's worth:

Test setup:
Two x1 probes with 50Ohm termination into Pico 2204A. Power supply connected to two 6Ohm resistor in parallel.


Measurement at 18V no-load:


Measurement at 17.22V 5.57A:

[ivi_yak]

Fnirsi, is a piece of crap, guys it has no protection from the voltage flowing in on input, and once it's off, it'll go to a short input 

my item is dead for now if someone has FW pls share

[Jagiro84]

Can be controlled by a PC!

But only with their software on windows, I did not see any protocol description.

The screenshot shows a serial port:



If that's true then I bet it's not difficult to reverse engineer.

I have this unit and I had to replace the stm chip, a firmware is nowhere to be found, are u able to extract the firmware from the chip ? Or anyone else reading this and having this same psu unit fniris dc6006l

[stepmuel]

I am in the process of writing a nice little Android app to control my FNIRSI DC6006L based on https://github.com/jcheger/fnirsi-dc580-protocol, but the serial data the device is sending has suddenly become very weird. It is mostly sending parts from previous messages again together with the updated data. Sometimes the data becomes longer and longer (by including the previous message) until it resets. And sometimes the first part of a message is skipped.

Not sure how that might be possible, but I think I might have somehow corrupted the parameter memory by sending unexpected data? It could have been accidentally setting negative voltage, or sending new voltage values too quickly. The serial port worked fine when I started developing, and I haven't connected any loads since then.

Unplugging the device doesn't fix it, and there doesn't appear to be a way to restore factory settings. Apart from sending data over serial, everything works fine.

I wanted to try updating the firmware, but I have neither the windows app, nor the firmware binary to upload. They can no longer be found on the FNIRSI website.

Does anyone still have those files and could send them to me? Or does anyone have other ideas how to fix my issue?

I am very sad about having broken my power supply, since I like it a lot and there doesn't seem to be a comparable alternative since it has been discontinued.