Hello,
Following on from my project driving a solenoid using PWM, i am now trying to improve ringing caused by the inductive load of the solenoid and potentially long driving cable (10M).
I am using around 1Khz 50% for testing, the ringing measured at the coil end is around 300mV decaying in around 250-300ns. The coil is around 400mA at 12V. I have a good, clean signal at the MOSFET gate and diode accross the coil.
I do not what to have to fit anything at the coil end, and expect that it will not be possible to improve on this noise. Of course if i fit the drive circuit at the coil end the ringing is greatly reduced, but this is not what i want to do, it just proves the point.
I just trying to understand and get some opinions if this result is expected, unfixable and acceptable in terms of EMC etc.
Thanks,
Following on from my project driving a solenoid using PWM, i am now trying to improve ringing caused by the inductive load of the solenoid and potentially long driving cable (10M).
I am using around 1Khz 50% for testing, the ringing measured at the coil end is around 300mV decaying in around 250-300ns. The coil is around 400mA at 12V. I have a good, clean signal at the MOSFET gate and diode accross the coil.
I do not what to have to fit anything at the coil end, and expect that it will not be possible to improve on this noise. Of course if i fit the drive circuit at the coil end the ringing is greatly reduced, but this is not what i want to do, it just proves the point.
I just trying to understand and get some opinions if this result is expected, unfixable and acceptable in terms of EMC etc.
Thanks,