| ??? 03/05/06 14:28 Read: times |
#111289 - Choke would be huge Responding to: ???'s previous message |
Hal said:
Since the lamps are driven by DC, I wonder if a suitable choke would minimize the inrush. Yes, theoretically. For a small lamp, like in my example, namley 12V/170mA, rated resistance is about 70 Ohm. First moment resistance is about 8.8 times smaller, so about 8 Ohm. As L/R forms the time constant of turn-on delay and as time constant of inrush situation is about 20msec, as it can be seen here, 
an inductance of at least L = 20msec x 8 Ohm = 160mH would be needed. Unfortunately, a choke of 160mH withstanding a DC current of 170mA would be huge! Kai |
