Posting this @ diyaudio, obviously many great minds reside here....
What circuit topology would you recommend for:....designing a SMPS/PWM based current source power supply to drive a 1ohm inductive load (motor field winding) from 24-96VDC at 10A, and the ability to vary current is a plus....
I did have a PWM circuit measuring the volt drop via feedback across a 0.055 ohm resistor in series with the load, and the resistor heat dissipation was very high, so I'm looking for other options..circuit worked very well for a while....also had peak starting current eventually burn the resistor and blow the MOSFET!
Also had an idea of using an inductor in series with the load, and measuring that, , maybe a sensor, or even just making a 96Vin/10Vout power supply instead (10V/1ohm=10A)
Ideas and comments welcome!!!
What circuit topology would you recommend for:....designing a SMPS/PWM based current source power supply to drive a 1ohm inductive load (motor field winding) from 24-96VDC at 10A, and the ability to vary current is a plus....
I did have a PWM circuit measuring the volt drop via feedback across a 0.055 ohm resistor in series with the load, and the resistor heat dissipation was very high, so I'm looking for other options..circuit worked very well for a while....also had peak starting current eventually burn the resistor and blow the MOSFET!
Also had an idea of using an inductor in series with the load, and measuring that, , maybe a sensor, or even just making a 96Vin/10Vout power supply instead (10V/1ohm=10A)
Ideas and comments welcome!!!
Attachments
Try a smaller value of current shunt with a current sense amplifier, and a soft-start.
There are very low value shunts available, see this example.
https://www.vishay.com/docs/30110/wsl3921-wsl5931.pdf
https://www.ti.com/lit/sg/slyb194e/slyb194e.pdf?ts=1659425269001&ref_url=https%3A%2F%2Fwww.google.com%2F
There are very low value shunts available, see this example.
https://www.vishay.com/docs/30110/wsl3921-wsl5931.pdf
https://www.ti.com/lit/sg/slyb194e/slyb194e.pdf?ts=1659425269001&ref_url=https%3A%2F%2Fwww.google.com%2F
