It works!! So happy right now :slight_smile: Built a circuit board to fit with a small battery in the battery tube and convert 310V DC into a regulated low voltage for the BlueROV2. The circuit has a battery current feedback loop to limit battery charge current to 5A, but will provide up to 20A tot…

@nick-wernicke - Very interesting. How did you decide on 510 vdc, and is that the voltage at the source power supply or after voltage drop at the ROV?

I am impressed for a handful of reasons.

@paul-unterweiser I used 310Vdc because that was the high voltage servo power supply that was available for purchase. The bottomside converter is an unregulated bus converter that accepts 230-400Vdc. If a 100m tether is about 25 ohms, at 310V 1A the loss is ~25V.

Awesome work, @nick-wernicke ! This is great and I’m excited to see it. I just want to give an important reminder to everyone reading this about safety for high voltages! Typical high voltage ROV power systems use the following features to ensure safety: An isolated power supply at the surface A G…

Hi Nicholas, Be carefull if the DC-DC overheats it might spike. I burnt out my Pixhawk like that which is why I am now using an additional isolated dc-dc power source for the electronics and eventually isolating it all with opto-couplers. I hope you are using a GFI breaker at least… @jwalser I ha…

…do you have some safety like a LIM or something?

Edit: Yes I have a LIM. Works great.

@etienne There is a supervisor circuit that disconnects the bus and battery relays any time the dc/dc output goes over 16.6V. The voltage setpoint control knob helpfully goes up to 17.6V so I can test that this feature works. 16.6V is the max for a 4S lithium battery, though I am going to run 15.9V …

I hear you, so little space to play with.

Finished my high voltage tether power mod!

Build/Make

jwalser (Jacob) March 5, 2019, 6:36pm 2

That’s awesome! Be careful out there, I wouldn’t stick my hands in a tub with 300V.

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Finished my high voltage tether power mod!

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Finished my high voltage tether power mod!

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