Hi,
Is there any way to lower the voltage ripple on Power 1 on the Pixhawk 2.1? It differs from 5,24 to 5,31 using Mauch BECs. Like with capacitors or any filter? Also, shouldnt it be around 5,35V? Maybe its normal when using 8 motors?
/MickeM
Hi,
Is there any way to lower the voltage ripple on Power 1 on the Pixhawk 2.1? It differs from 5,24 to 5,31 using Mauch BECs. Like with capacitors or any filter? Also, shouldnt it be around 5,35V? Maybe its normal when using 8 motors?
/MickeM
You can use a small ferrite choke on your power leads.
A ferrite choke does more less nothing with a voltage ripple in small voltage DC environment.
Mauch BECs are quite well designed and have very low ripple. It could be a measurement noise (you can check it by powering up from USB and check voltage).
If it is indeed a power ripple, if could be coming from the motor/esc line feeded back to the main power. In this case you need a proper filter. Recommend checking Dave’s excelent video on the topic : https://www.youtube.com/watch?v=wopmEyZKnYo
That is not true that ferrite choke will not suppress ESC generated EMI noise due to brushless motors.
The EMI noise on DC voltage is due to brushless motors otherwise the entire pixhawk power design is running of pure DC battery power source (There is no AC to DC conversion going here) then how you can have ripple on such a system besides brushless motors are the main culprits here.
Mauch power system never touches the ESC wires (signal and BEC out put voltage) connecting back to the FC. even though you are powering the motors via Mauch but that doesn’t solve the problem of feedback from motors.
I always use chokes on ESC leads prior to connecting them to the FC. they suppress EMI noise both on signal wires as well as DC if used to power anything off using the built in BEC.
If one really wants to get rid off all the noise, we’ll there are many ways that can be accomplished using filters but then the UAV weight will increase significantly.
The main thing to monitor in a UAV design is that does the noise generated by the motors causing an other devices to malfunction? This is a whole different discussion altogether.
So this it why I said that chokes are not effective for power ripples in UAV.
Have you seen this system? Human carring UAV.
Some company in Ukraine design these ESC for large T motors.
Not Ukrainian but Czech
Any experience with these products. I saw them at the Boeing human UAV flying contest in CA earlier this year.