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[Solved] Extremely high current peak on startup  

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Illylonka
(@illylonka)
Eminent Member

Hi,

I recognized a short, difficult to measure, high current peak on start up. Maybe the gate driver IC receives erroneous signals during the µController startup? This could potentially damage delicate external hardware...

I don't know which forum section to put this into. You may want to open another forum section.

Best

Illylonka

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Posted : 29/09/2020 4:47 pm
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(@milad)
Chief Member Moderator

Hi @illylonka,

ok, to see what you witnessed two things needs to be considered:

1- Was the peak you're talking about at the Supply input? if Yes, that could be the initial charge of the BUS capacitances which are around 2000uF which is fairly a high value, but that's not a bad thing and is normal as it all happens internally inside SOLO and is managed by the hardware itself.

2- Did this peak you're talking about happened at the output? to the motor? that could be the initial inrush current to the motor that varies from Motors to Motors and depends on the inductance and resistance of the motor itself, but SOLO will protect the motor against it if this phenomenon takes for more than 0.1ms. Any controller eventually needs to allow for a very short time of current inrush, in which in SOLO is in the magnitude of 5us, and within that time period, the current controller will kick in and tries to stabilize the current inside the motor.

so pls let me know if this could be helpful, or you're talking about something else.

Regards

Milad

 

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Posted : 29/09/2020 8:45 pm
Illylonka
(@illylonka)
Eminent Member

@staff The peak happened on the DC supply side, so it was probably only the capacitor charging. I really did not expect such a high capacitance there – the power source should usually be rather stable it should be connected to the SOLO device via a rather low inductance.

Thank you very much for that clarification!

Illylonka

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Posted : 30/09/2020 12:50 pm
(@milad)
Chief Member Moderator

@illylonka

Yeah, in a Motor controlling unit, a local high value of capacitance is essential and necessary to stabilize the BUS voltage in a good way, we tried to use the maximum possible capacitance there to get the acceptable results.

Regards

If you found the answers helpful and you could solve your problems, please kindly verify here to help others in the future.

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Posted : 30/09/2020 3:47 pm
Illylonka
(@illylonka)
Eminent Member

@staff Wow, you actually need that much capacitance? I thought this would be some kind of overkill for the Beta version and the final versions will be more economical...

Anyhow, it should not really damage decent supply...

Illylonka

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Posted : 01/10/2020 7:29 am
(@meric)
Eminent Member

@illylonka perhaps you can consider a pre-charge resistor, that limit inrush current AND allow your system to check the integrity of the line before to deliver the power.

This post was modified 2 weeks ago by Meric
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Posted : 12/10/2020 10:04 pm
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