440roadrunner said: (quoted from post at 19:26:20 06/23/09)
JMOR said: (quoted from post at 12:35:58 06/23/09)
Time constant is RC for a resistor-cap ckt and L/R for inductor-resistor ckt.
Yeah, I UNDERSTAND that. What was said, was, that ADDING series resistance to L with a diode in circuit would DECREASE the RC time.
The quote:
"A resistor in series with the diode will make it decay faster at the price of higher voltage across the contacts."
That to me seems backwards.
Well, I might learn something too, but we can keep trying. So, now we have a loop of a circuit consisting of a diode, inductor, and a resistor. Time constant proportional to L divided by R. Contacts open, voltage across reverses, diode comes into conduction. At this point if additional resistance is added (i.e., the denominator increases), then the L divided by a now larger number has a result that is smaller. Hence, the "decay faster". Higher voltage across contacts? Well if only a diode, the voltage would be only the diode drop, but with added resistance, it is the sum of diode plus the voltage across the resistor caused by the inductor supported current. OK? If not keep asking.
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