Home        Store        Learn        Blog

ESC power down and schematic

Is there a schematic for Basic ESC?
I am trying to figure out a way to make it power down so it does not draw current from the battery.

@drid Unfortunately, we do not have access to the ESC schematics. The manufacturer keeps this design closed, and does not provide schematics to customers. However, it is a brushless sensorless standard ESC design, and should be very similar to other BlHeli_S ESCs on the market. The markings on the components are also legible, and datasheets can be found online.

Hy kklemens,

Probably the answer maintains, but do have any update on the ESC schematics?
I currently thinking of adding some basic ESC to provide interface and control some T200 that i added to our autonomous ASV, in order to make it holonomic capable (T200 provide lateral movement, while some torqeedo ultralight provide the remaining DoF).

I am currently using the VESC esc, but for some reason they don’t work with the T200 as smooth as with the torqeedo thrusters… so i was thinking of add some basic esc to control the T200. Nonetheless, my power bus is of 48V, winch is not supported by the basic esc.

So if you could provide the basic ESC schematics, i can redirect the input voltage 48V to only power the T200 (of course i have to limit its duty-cycle so its average voltage never surpass the rated voltage of T200), and power the ICs in the basic ESC, with a 24W DC/DC converter from 48v to 24v and 6W DC/DC converter from 48v to 5v, that i already have powering our ubiquiti communication bullet and remaining electronics units.

Best regards and thank you for all the help,

Hi @rookie_101,

Kevin’s previous answer is still accurate, we do not have access to the ESC schematics. The ESC isn’t anything particularly unique, it will be similar to just about any other BlHeli ESC.

What you are proposing will not work, there is no way to feed 48V to the thruster without it passing through the ESC, the ESC directly operates the thruster and executes the commutation. 48V at any part of the ESC will damage it.

I would suggest one of three options:

  1. Use a higher power DC/DC converter to step the 48v down to an acceptable voltage for the Basic ESC and T200.

  2. Use an ESC other than the VESC that can accept 48V input power, and limit the duty cycle to keep the current draw below 30 A an any point.

  3. We have successfully used the VESC with out thrusters, but it does require modifying the current sense resistors for a lower current range, and turning the parameters

-Adam

Hi Adam,

Once again thank you for all the support…
I think i didn’t explain well… My suggestion is to only switch the input for the H-Bridge from up6s to to 48V. From what i can seen the datasheet of the mosfet driver (FD6288Q), it’s able to support up to 275V for the input of the H-bridge. It’s Vcc however it’s limited to ~=25V. So i intend to power one with the 48V from a battery and the other from a 24W @ 24V DC/DC converter. Since the signals for the high side mosfets are floating, regarding the vcc (due to bootstrap technique)…, i thought i could be performed without cause harm to the basic esc.

Nonetheless, i would have to check if the mosfets are able to withstand the new voltage differences across its terminals (Vds, Vgs) and the proper voltage for commutation are guaranteed (Vgs <> Vgsth). If they are not meet, i would have to change them, if i am able to find ones that fit the needs and with the same package.

Regarding you suggestions, i appreciated all of them, but some are not feasible in my case:

  1. It would result in a very powerful converter (approx: 16V * 30A = 480 W / 0.8 efficiency => 600 W ); Also will add weight, will have big dimensions and wil generated more heat inside the hull.

  2. I will try to find a different esc… tho you recommend anyone ? I just asking because, it would be great if they have/support the same firmware has the basic esc, so i could reuse some the interface electronic boards previous developed by us, to provide the interface between the esc and the main board computer

3.I could connected to the VESC, and turn it properly when connected direct to the vesc. But when, i tested it with all the watertight and connections along the way, it started to run but with some vibrations and not smooth. I think all the cables and connections along the way, increase the impedance (more the inductance, since i used 10AWG wire all the way) to some considerable % of the T200 inductance’s that, the motor starts to rotate not smooth. With your ESC, worked fine…
But i will try again, and check the sense resistors.

Once again thank you for all the help,
André