Wow, that is a 250 dollar USB charger, without hub functionality, wireless charging or built in battery ![WTF? :wtf:](https://www.eevblog.com/forum/Smileys/default/wtf2.gif.pagespeed.ce.pxLiY5pjs4.gif)
Turns out you can't charge a device at high currents while there is a data connection. In fact the data lines are forced to specific voltages in order to communicate the charger's current output capability.
I did a lot of research on USB charging and it's actually much more of a PIA than most people realize.
Wireless charging and battery also present problems for high speed high power charging. I've got a Qi charger and it never charges as fast as a wired connection. Battery solution is a different kind of product and no one talks about what happens when the battery dies in a few years, buy a whole new charger I guess.
OLED display is my favorite feature on the Exigo. But I'm a data nerd.
My problem is that there is nothing in it, which would justify the price.
Yes, wireless charging is slow, I give you that. There is usually a 6-7 hour period in my day, when I'm not doing anything.
There are battery product with replaceable cells. And I dont need a OLED display. Why would I? There is a screen on my phone/tablet/ebook which tells me when the charging is complete.
But seriously, you can probably sell this product. It already sells. Although this is an electronics forum, people kinda aware how much something should cost. Just a quick calculation:
60W laptop power supply (FSP): 25 USD
4x LMZ22005 5A SIMPLE SWITCHER® Power Module 4*6USD
Charging port contoller: TPS2513A 2*1USD
PCB: 5 USD in quantity (European manufacturer)
Assembly: About 4-5 USD, European manufacturer
Housing: I cannot give you an estimation.
OLED 20 USD
Whatever MCU platform 10 USD
That is about 100 USD + housing.
And I chose deliberately stupidly expensive components.
So you have 4*4A charging capability. To charge 4 tablet, as nothing else seems to take this amount of power. Well, I don't have 4 tablets.