I’m using a step-up converter outputting 24v to charge two 50v caps wired in parallel that are used in a circuit to power an electromagnet. The magnet will be pulsed momentarily via a FET and has a flyback diode across it, I also have a diode on the positive output of the module. My question is should I have some sort of protection for the negative side of the module?

This is the module I’m using: https://www.amazon.co.uk/dp/B091YQRZPL?ref=ppx_yo2ov_dt_b_fed_asin_title

I doubt the module has any built-in protection – I just want to avoid frying them, even during testing. There's approx 2 amps going through the coil at 24v, that's without caps.

Any help greatly appreciated.

Nick

 

A boost converter already has an output diode, so your diode on the positive output isn't doing anything.
The diode across the coil will be sufficient, make sure it is rated at 2A or more.
I hope the module is current limited, as 2A @4V will only give you 0.33A @ 24V. Have you worked out how short your current pulse in to the solenoid must be?

 

Hi Ian

Thanks for the response. I've tried to find a spec sheet for the module to see if there's any protection but can't find anything. If you think most of these modules have an ouput diode fair enough. If I run it at 20v it should be good for 0.5A, which should be enough to saturate the caps after 10 secs or so, which is what I'm after. The coil (air coil, not a solenoid) is activated via a remote (momentary) so it will be a very short single pulse. I'm still wondering about protection on the negative side though - any thoughts on that?