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Asked — Edited
Resolved Resolved by Dave Schulpius!

Powering H-Bridge And 12V Dc Motors And Feedback Pots

My next project is a BB-9. If anyone knows of it, I'm using the Joe Drive and 12v DC Planetary Motors with BTS7960 43A High Power Motor Driver H-Bridges. I'm using a 12V 20000mah battery for power.

If I power the EZ-b with 12v, can I run the power from the digital port straight to the H-bridge, or should I power it from the power source?

Thanks


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PRO
USA
#1  
@kashyyyk,

If you are using a power base, there is a 20 amp fuse

Fuse Replacement Lesson:
https://www.ez-robot.com/Tutorials/Lesson/47

If both motors pull more than 20 amp, you will end-up replacing the fuse.

There are other issues like wire gauges, you need to have proper wires to handle the motor amps.

My recommendation is to have separate circuits EZ-B and motor h-bridges.

you need to pickup the right wire gauge, and a fuse block something like this:

https://www.superdroidrobots.com/shop/item.aspx/atc-blade-fuse-block-4-circuit/1837/
#2  
The supply voltage for your motors pulling up to 43 amps should be supplied from a power source capable of supplying the peak 43 amps needed. Do not channel this amp rating through the EZB. 20 amps total for all devices is recommended. There's a protective fuse that will blow it you exceed this rating. However it looks like the logic part of this h-bride is 3.3-5V. This voltage might be able to be supplied by the EZB directly or channeled through it. ;)
#3  
Actually a small correction here. The ezb4 can supply 5 amps continuous through the digital power pins with the occasional current spike of 20 amps... Either way, power your H-bridge directly from a battery or power source...
EZB4 specifications PDF
#4  
Happy New Year!


Ok thanks! I'll power them through a fuse panel.

Once I get it wired, I know I will have script questions.
PRO
USA
#5  
@RichardR

Quote:


Actually a small correction here. The ezb4 can supply 5 amps continuous through the digital power pins with the occasional current spike of 20 amps


Thanks, and i believe can be very relevant.

I missed that point, I wrongly assumed the VIN is connected to the Digital Ports Red Pin.

back to the lesson:
https://www.ez-robot.com/Tutorials/UserTutorials/163/3

Quote:


The "maximum" continuous current draw through the EZ-B v4, is 5 amps. (limited by reverse polarity protection).


PCB:
EZB4:

one Schottky's diode (A7 T35) between the power in and the Vin. The 5 Amps must be diode max forward current.

Iotiny:
one Schottky's diode (A7 T63). I'm guessing ... the diode reference is different the limit must be different too.

Once again thanks for pointing out!
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