Setting Timing Circuit of Power Supply Connection

Published:2011/7/26 0:54:00 Author:Michel | Keyword: Power Supply, Setting Timing Circuit | From:SeekIC

Picture 1 is setting timing circuit of power supply connection.When the power is connected,triggering PWL of ME555 feet 2 is below (1/3)Ucc and feet 3 outputs pulse during the time decided by R2 and C2.Then,+Ucc charges C2 via R2 and VD1 and charging voltage rises to +Ucc.Because of VD1 isolation function,R1 and C1 negative trigger the pulse.VD1 is fast charging diode when the power is off and it can keep the circuit working reliably when the circuit is off and turned on again and again in short time.NE55 outputs T high-level of pulse which is determined by R3 and C3,namely, T=R3C3. Picture 1:Setting Timing Circuit of Power Supply Connection



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