CURRENT_CONTROL_FOR_POWER_SWlTCH

Published:2009/6/29 2:15:00 Author:May | From:SeekIC

Circuit makes power supply current increase gradually from zero when supply is tumed on, to eliminate transients that sometimes cause alarming loudspeaker thumps in audio systems. Current through silicon power diode D1 is controlled by voltage on C1, which charges up after closing of switch with time constant C1R2R3/(R1 + R2). When switch is opened, rundown of supply curent is controlled by discharge of C1 through R2. Article also covers use of two current control circuits in tandem for handling higher Ioads.-P. J. Briody, Power Supply Delayed Switching, Wireless World, March 1975, p 139-141.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/Switch_Control/CURRENT_CONTROL_FOR_POWER_SWlTCH.html

Print this Page | Comments | Reading(3)