efficiency of the ev3 H-bridges ?

Discussion specific to the intelligent brick, sensors, motors, and more.
philoo
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Joined: 29 Sep 2010, 09:04
Location: Paris, France
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Re: efficiency of the ev3 H-bridges ?

Post by philoo »

so you mean overall 3A for all and everything?
3A is the internal current limit of driver chip. but its continuous rating is 1.5A (2A peak) per motor. But it can only provide current provided by upstream fuse, battery, etc...
It looks to me like there are two separate thermal fuses one for each of the two motor driver chips (Outputs AB and CD). Not sure what current they trigger at though....
I really need to open an EV3! Have you made any photo of the main board?
Philo
HaWe
Posts: 2500
Joined: 04 Nov 2014, 19:00

Re: efficiency of the ev3 H-bridges ?

Post by HaWe »

I would never dare to open the case.
But I'm sure Xander has already done it - there's nothing between heaven and earth that holds him back :roll:
gloomyandy
Posts: 323
Joined: 29 Sep 2010, 05:03

Re: efficiency of the ev3 H-bridges ?

Post by gloomyandy »

Not opened the EV3 up, but the Lego schematic seems to show 2 fuses for the two drivers.... But the scan quality is very poor so can't read the part numbers and other details...
philoo
Posts: 76
Joined: 29 Sep 2010, 09:04
Location: Paris, France
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Re: efficiency of the ev3 H-bridges ?

Post by philoo »

OK, we have the same ;)
Philo
philoo
Posts: 76
Joined: 29 Sep 2010, 09:04
Location: Paris, France
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Re: efficiency of the ev3 H-bridges ?

Post by philoo »

I opened an EV3... I didn't want to take the risk of breaking something, so I didn't go too far away, but enough to see the fuses. Indeed, there are 3 of them, all rated 1.1A. So maximum available current is 1.1A (permanent, something around 2A for a short time) for 2 motor ports.
Philo
HaWe
Posts: 2500
Joined: 04 Nov 2014, 19:00

Re: efficiency of the ev3 H-bridges ?

Post by HaWe »

edit:
srry, I must have misunderstood:

you wrote THREE fuses at 1.1 A each, but we have 4 motor ports.

So there are 2x single fuses for 2x single motors each
and 1 fuse for 2 motors altogether?

Which motorss by which fuses? e.g.:
A / B / C+D ?
gloomyandy
Posts: 323
Joined: 29 Sep 2010, 05:03

Re: efficiency of the ev3 H-bridges ?

Post by gloomyandy »

Hi Doc,
There is one fuse for motors A/B one fuse for motors C/D and one fuse for everything else (sensors etc.)
HaWe
Posts: 2500
Joined: 04 Nov 2014, 19:00

Re: efficiency of the ev3 H-bridges ?

Post by HaWe »

ah ok, now I understand. Thank you Andy!
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