Converter In-Rush Thermistors etc, UPDATE -4
UPDATE on 17 Nov, Update 2 on 22 Nov, Update 3 on 16 Jan 14, Update 4 on 19 Oct 14. --------------- In a recent thread there was mention of how you can wreck your gizmo (in my case a converter) ...
Forum Discussion
Salvo wrote:
They are mistaken in regards to needing the thermistor to limit capacitor inrush current. These capacitors can easily take inrush current that's 100 times the steady state current (13A).
The person who wrote the patent was probably not the designer. I've had a patent issued, but I didn't write it.
Most likely the designer did the same calculation I did.
Rmin = 170V / I_diode_surge-max
SalBFL13 wrote:Salvo wrote:
Interesting, the PD patent shows a surge current thermistor of 1 ohm.
Sal
I see they use a 20a, 400v diode bridge, where mine is a 25a 60. Not sure what that means for what the thermistor needs to do to protect the bridge.
However it says the thermistor is to protect the unloaded capacitors at cold start. It has three 850s instead of my two 1200s.
I missed the PD's output DC amps size etc that the specs for those parts goes with. Mine is a 100amper with 13a steady state input.
So what does that all mean wrt the risk to the diode bridge as asked about in my previous post?
