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General => Contests & Events => Topic started by: axolotyl on April 10, 2018, 04:17:19 am

Title: [worldwide] FREE USB Fast Charger from Pirl (ENDED)
Post by: axolotyl on April 10, 2018, 04:17:19 am
We're live now on Kickstarter:

https://www.kickstarter.com/projects/pirl/the-ultimate-charger-for-power-users (https://www.kickstarter.com/projects/pirl/the-ultimate-charger-for-power-users)

_____________________________________________________________________________________________________
NOTE: This contest has ended.

Dear All,

I'm Kobby and as part of spreading the word before our Kickstarter launch, we're giving away some of our 50W USB chargers.
(https://www.pirlcharger.com/s/charger_bare7c.png)
Specs

How to enter

What you get
1 x Pirl USB charger
1 x car adapter
1 x Meanwell AC/DC adapter

Third Party review
Check out a teardown here: https://lygte-info.dk/review/USBpower%20Pirl%20Charger%204x2.7A%20usb.html (https://lygte-info.dk/review/USBpower%20Pirl%20Charger%204x2.7A%20usb.html).

Feedback welcome.
Title: Re: [worldwide] FREE USB Fast Charger from Pirl
Post by: Halcyon on April 11, 2018, 04:25:58 pm
What kind of prices are you considering for the Kickstarter project?

It would also be nice if you could include decent quality USB cables with your product. More often than not, USB cables aren't capable of supplying anywhere near the maximum output of the charger.
Title: Re: [worldwide] FREE USB Fast Charger from Pirl
Post by: zucca on April 11, 2018, 11:32:14 pm
Next release please provide the CURRENT flowing out in each ports. WATT total is nice (to get a proper power supply) but not as useful.
Title: Re: [worldwide] FREE USB Fast Charger from Pirl
Post by: axolotyl on April 12, 2018, 12:02:33 am
On pricing, we're still finalizing with our manufacturer and suppliers. Same with bundling cables. Stay tuned.

Good point on USB cables being an issue. We compensate for voltage drop across the cable, but obviously if you have a crappy cable we can only compensate so much.   
Title: Re: [worldwide] FREE USB Fast Charger from Pirl
Post by: brainwash on April 12, 2018, 11:00:38 am
How can it compensate for cables? I assume it can only go up to the maximum USB voltage limit (5.25V). Even with that value, it would still be better than some chargers that swing around 5.0V.
I guess a small firmware update could make the display show amps on a long-press of the brightness button.
Shame that it doesn't support the typical 19V laptop supplies, but not a huge deal.
Any thoughts on mitigating audible noise? For me, capacitive piezo noise (or inductor whine) is a huge issue, ended up sending half of the high-power multiport chargers back.
Title: Re: [worldwide] FREE USB Fast Charger from Pirl
Post by: blueskull on April 12, 2018, 11:14:32 am
Any thoughts on mitigating audible noise? For me, capacitive piezo noise (or inductor whine) is a huge issue, ended up sending half of the high-power multiport chargers back.

There are buck controllers that support forced switching mode when cycle skipping falls into audible range. Many silicon manufactures have this sort of inaudible pulse skipping mode technology.
Or if you don't care about light load efficiency, just force it into forced CCM forever.
Title: Re: [worldwide] FREE USB Fast Charger from Pirl (ENDED)
Post by: zucca on April 19, 2018, 03:55:35 am
I did not win.  :'(