Published:2009/6/24 5:41:00 Author:Jessie | From:SeekIC
C is a large capacitor that has a charge time of RSUPPLY C, assuming RSUPPLY <Rcoil, The discharge time will be Rcoil C neglecting relay coil inductance. With C = 10,000 μF and Rcoil 500 Ω, a release time constant of 5 seconds might be obtained. Many relays will hold in until the coil current decays to 25% of the pull-in current so that the actual time constant depends on the relay holding current.
Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/FAST_TURN_ON_DELAYED_OFF_RELAY_CIRCUIT.html
Print this Page | Comments | Reading(3)
Code: