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Micro USB Bulk Power Supply

thebradlywalker

Dec 22, 2023
1
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Dec 22, 2023
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1
Howdy,

I'm about to purchase a large (1200 units) order for some GPS trackers that recharge via micro USB. I need a good way to recharge these units in bulk. The status quo solution is to purchase a large USB bank and charge the units. However, the wires create quite the rat's nest. I would rather design a rack that only has the male, micro USB protruding through the rack. Whoever is recharging the ~100 units at a time would just "stab" the small GPS device down on the micro USB stub protruding through the rack.

I'm a mechanical engineer so I'm not completely ignorant, but also know very little about small electronics like this. I'm looking for some hardware guidance on how to step down the voltage/amperage from the wall receptacle to my rack to be able to do this.
 

Martaine2005

May 12, 2015
4,903
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May 12, 2015
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You can buy transformers (SMPS) that output 5V and high current. The current requirements depend entirely on each unit’s current consumption while charging x (times) the amount of units to charge simultaneously. Then add some overhead to keep it from working overtime. You will parallel wire each USB connection, so a rats nest can be hidden in your DIY project.

Martin
 

kellys_eye

Jun 25, 2010
6,497
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Jun 25, 2010
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6,497
Getting a USB port to align with a plug will take some careful manufacturing. The plug is designed for 'straight' entry and any deviation will cause damage. I have enough trouble manually pushing a USB charging lead into my phone every day.

The supply voltage/current is covered by @Martaine2005 but I don't recall ever seeing a 'drop-in' USB type charging holder - perhaps for the reasons I mentioned?
 

Martaine2005

May 12, 2015
4,903
Joined
May 12, 2015
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4,903
3D printing Is definitely the way to go for this project.
A mold of the base of the GPS or side entry? Will be necessary for a drop in style ‘lined up’ charging base.
The precision items I’ve seen 3D printed make this the obvious choice.

Martin
 
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