Kobuki Power Supply Issue

[Michael Li]

Dear There,

I'm having issue to power up Nvidia Jetson TX1 with carry board. I have tried to use the 12V@5A and 19V@2A, both failed. According to Nvidia TX1's developer community, TX1 needs a little more current at power on, the power supply coming with TX1 is 1...@4.74A.

Could you help to provide a solution?

Thanks,

Michael  

[Scott C. Livingston]

Did you consider buying separate Lithium-polymer (LiPo) batteries for
the Jetson board? E.g., there are recommendations at
https://devtalk.nvidia.com/default/topic/914529/jetson-tx1/battery-for-jetson-tx1/post/4798510/#4798510

[Michael Li]

Are we sure this issue could not be resolved? We need Kobuki's docking station to recharge the bot including TX1. Thanks! 

[Daniel Stonier]

On Thu, Nov 10, 2016 at 1:09 PM, Michael Li <gmh...@gmail.com> wrote:

Are we sure this issue could not be resolved? We need Kobuki's docking station to recharge the bot including TX1. Thanks!

We've had some incoming requests about the power supply for both this board, and also some of the Odroid boards (5V@1A) which spike on startup too much for kobuki to handle. Specifications don't stay stationary for very long in the mobile computing world :)

Right now, unless someone in the community has an interesting solution, then I'd say something like what Scott suggested is your way forward. Yujin has some plans to upgrade to Kobuki 2 this year (and part of that includes the power supply interface), but this is not yet confirmed.

Regards,

Daniel

.

 

On Wednesday, November 9, 2016 at 7:53:36 PM UTC-8, scottclivingston wrote:

On 11/09/2016 09:58 PM, Michael Li wrote:
> Dear There,
>
> I'm having issue to power up Nvidia Jetson TX1 with carry board. I have
> tried to use the 12V@5A and 19V@2A, both failed. According to Nvidia TX1's
> developer community, TX1 needs a little more current at power on, the power
> supply coming with TX1 is 1...@4.74A.
>
> Could you help to provide a solution?
>
> Thanks,
> Michael

Did you consider buying separate Lithium-polymer (LiPo) batteries for
the Jetson board? E.g., there are recommendations at
https://devtalk.nvidia.com/default/topic/914529/jetson-tx1/battery-for-jetson-tx1/post/4798510/#4798510

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[Michael Li]

What's the input voltage range of Kobuki? Its prowr supply is 18.2V, is it safe to use TX1's power supply 19V instead? Does anyone know when Kobuki is at docking station, will the external power supply be used directly? Thanks! 

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[Marcus Liebhardt]

Hi Michael,

On 10 November 2016 at 13:50, Michael Li <gmh...@gmail.com> wrote:

What's the input voltage range of Kobuki? Its prowr supply is 18.2V, is it safe to use TX1's power supply 19V instead?

Basic input voltage may range from 18 to 30V. However, we cannot guarantee nor warrant the use of 3rd party equipment. If you decide to try it out, you will be on your own.

 

Does anyone know when Kobuki is at docking station, will the external power supply be used directly? Thanks! 

Yes, it is used. Some extra details from our H/W engineer, Hyeongju:

Our power supply outputs 3.16 A at max. From that current  up to 1.95 A (small battery, 4S1P) or 2.385 A (big battery, 4S2P) is used to charge Kobuki's battery. The rest of the current is available via the 19 V connector. The other power connectors (3.3V, 5V, 12V) are linked to a power management system connected to the battery. So pulling current from there drains the battery.

Hope this helps!

Cheers,

Marcus

 

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Yujin Robot
Seoul, Republic of Korea
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[Marcus Liebhardt]

Hi Michael,

On 11 November 2016 at 14:15, Michael Li <gmh...@gmail.com> wrote:

Hi Marcus,

Thanks for getting me back!

To make it easy for me to understand, could you help to clarify the followings:

Let's assume the battery is fully charged and only the 12V@5A kobuki on-board power outlet is used: 

- If Kobuki is at the docking station, what's the maximum current could be provided from the 12V@5A kobuki on-board power outlet?

- If Kobuki is away from the docking station, with the small battery 4S1P, what's the maximum current could be provided from the 12V@5A kobuki on-board power outlet?

- If Kobuki is away from the docking station, with the big battery 4S2P, what's the maximum current could be provided from the 12V@5A kobuki on-board power outlet?

- What's the maximum current could be provided from the 12V@5A kobuki on-board power outlet in all cases? In which configuration?

In all case we recommend max. 5 A. More we cannot guarantee nor warrant.

We have a fuse behind the 12V5A connector, which breaks at 10 A.

The 4S1P actually provides up to 10 A, the 4S2P only 5 A. If more current than these numbers are drawn the BMS will cut the connection.

Cheers,

Marcus

PS: I'm including the list to share, since others might be curios about this as well.

 

Thanks,

Michael

[Michael Li]

Hi Marcus,

These are very helpful!

Thanks,

Michael

Hi Michael,

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