Hi all,
Despite my GCSE B in electronics a, er, few years back, and various other learnings since then, I've got a trivial problem that surely has a trivial solution. But can I find it?
I've got a protected lithium ion battery with circuitry, & I'm running a motor that pulls about 3A at stall. The issue is that the in-rush current is about 9A and so it trips the short circuit protection.
This has been driving me nuts for years, especially as it is an "intermittent fault"!
It's a single pack of 2x18650 cells in parallel, so current isn't an issue once it gets going.
Things that "sort of work" include:
Adding a diode (but that gets red hot, dropping 0.7V & wasting lots of power)
Adding a resistor (likewise)
Adding a really long bit of wire (sometimes works, possibly as an inductor, possibly as a long resistor?)
Double tapping the button really fast (works about 50/50 - if it is still spinning as you get the second tap, it'll fire up just fine and run for hours)
What I really need is something that has a bit of resistance to start with, but drops to (near) zero after a few tenths of a second. Oh, and space is a bit tight, so smaller = better.
Help, please!
Despite my GCSE B in electronics a, er, few years back, and various other learnings since then, I've got a trivial problem that surely has a trivial solution. But can I find it?
I've got a protected lithium ion battery with circuitry, & I'm running a motor that pulls about 3A at stall. The issue is that the in-rush current is about 9A and so it trips the short circuit protection.
This has been driving me nuts for years, especially as it is an "intermittent fault"!
It's a single pack of 2x18650 cells in parallel, so current isn't an issue once it gets going.
Things that "sort of work" include:
Adding a diode (but that gets red hot, dropping 0.7V & wasting lots of power)
Adding a resistor (likewise)
Adding a really long bit of wire (sometimes works, possibly as an inductor, possibly as a long resistor?)
Double tapping the button really fast (works about 50/50 - if it is still spinning as you get the second tap, it'll fire up just fine and run for hours)
What I really need is something that has a bit of resistance to start with, but drops to (near) zero after a few tenths of a second. Oh, and space is a bit tight, so smaller = better.
Help, please!