Energy dump / overvoltage protection

Discuss hardware related to the VESC such as the NRF nunchuk.
arvidb
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Re: Energy dump / overvoltage protection

Postby arvidb » 11 Feb 2017, 18:16

Attachments
edump_Darlington_performance.png
edump_Darlington_performance.png (11.96 KiB) Viewed 2673 times
edump_Darlington_SOA_plot.png
edump_Darlington_SOA_plot.png (10.7 KiB) Viewed 2673 times
edump_Darlington_comp_dissipation.png
edump_Darlington_comp_dissipation.png (9.87 KiB) Viewed 2673 times
Last edited by arvidb on 11 Feb 2017, 19:08, edited 1 time in total.

arvidb
Posts: 234
Joined: 26 Dec 2015, 14:38
Location: Sweden, Stockholm
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Re: Energy dump / overvoltage protection

Postby arvidb » 11 Feb 2017, 18:23


rew
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Location: Delft, Netherlands.
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Re: Energy dump / overvoltage protection

Postby rew » 11 Feb 2017, 23:20


lizardmech
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Re: Energy dump / overvoltage protection

Postby lizardmech » 12 Feb 2017, 07:06


lizardmech
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Re: Energy dump / overvoltage protection

Postby lizardmech » 14 Feb 2017, 10:36

This guy made something similar for his electric unicycle, sends energy through high powered LEDs when overvolt occurs.
https://www.youtube.com/watch?v=Sb37y3JNDZ4

arvidb
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Re: Energy dump / overvoltage protection

Postby arvidb » 14 Feb 2017, 13:42


arvidb
Posts: 234
Joined: 26 Dec 2015, 14:38
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Re: Energy dump / overvoltage protection

Postby arvidb » 14 Feb 2017, 13:54


lizardmech
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Re: Energy dump / overvoltage protection

Postby lizardmech » 14 Feb 2017, 15:49


rew
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Re: Energy dump / overvoltage protection

Postby rew » 14 Feb 2017, 16:24

Those 100W leds have a curve of about 10mA at 27V up to their rated 3A at 33-35V. This makes them ideal for him to simply connect the two of them in series across the battery at 66V.

arvidb
Posts: 234
Joined: 26 Dec 2015, 14:38
Location: Sweden, Stockholm
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Re: Energy dump / overvoltage protection

Postby arvidb » 24 Feb 2017, 21:00

Here's the finished dump. It seems to work as it should! :) I'm glad I did the voltage/sink current plots, otherwise I think I would have been confused about the knee in the current draw.
SAM_1283_energy_dump.jpg
SAM_1283_energy_dump.jpg (148.54 KiB) Viewed 2578 times


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