Wurkkos FC11 with PD charging - Got it Wurkking!

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Prplxt
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Wurkkos FC11 with PD charging - Got it Wurkking!

Well kinda wurkking...  and I need help from you EE gurus.

So I added two 5.1 K Ohm resistors to my Wurkkos FC11 - see them on the two middle "CC" posts bridging to ground in this image:

And the great part is that I can make the charging lights light up and it will draw current from a PD charger through a c-to-c cable:

BUT... it's intermittent for some reason.  The charging lights (and indeed the ammeter I use to test) go on for a few seconds and then turn off and the cycle continues.  It is delivering a charge - just on-and-off.

So far I have yet to cook anything.  The PD charger will still fast-charge my phone and an a-to-c cable will still charge the light!


Anyone have any thoughts as to what's going on?

 

thefreeman
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Answered on reddit, but seeing the pinout of this 12 pins connector I think you don’t have the resistors on the right pins.

Aside from that I’m curious about the teardown process, as I wanted to do the same.

Prplxt
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thefreeman wrote:
Answered on reddit, but seeing the pinout of this 12 pins connector I think you don’t have the resistors on the right pins.

Aside from that I’m curious about the teardown process, as I wanted to do the same.

Saw that and thanks! so its a 6 pin layout here

It’s apparently for power only because it only has the pins needed for power supply a) Ground pins 1 and 6 b) V+ pins 2 and 5 and c) CC pins 3 and 4 (the middle two)

It’s ideal because the pins are big enough to solder onto (barely bro this shit is SMALL)

So ideally the two resistors signal the PD supply to deliver 5vdc and up to 3a.

The weird thing is it DOES. But there are odd behaviors that ensue like in this case my PD supply was switching on and off.

I’m thinking my soldering job might be wonky at the pin side and as current flows through the resistors to do the signaling I might be getting a gap.

That must be it.

But what the hell do I know I’m PRPLXT! But I do have a dream and that dream involves making PD chargers work on flashlights.

gchart
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Interesting… I really need to find the time to tear apart my FC11