Relay-composed Start-up Circuit

Published:2011/5/7 3:23:00 Author:Joyce | Keyword: Relay-composed, Start-up | From:SeekIC

Relay-composed Start-up Circuit is shown in the graph below. In the input end of the power ,resistance R is connected.R has two functions.the first oneis that it can prevent impluse current on the large capacitance C1 in starting up,which wouldimpact the poweritself;the second one is to prolong the time when the load is receiving the electric supply. In this process, because the voltage of the relay J in the output end is less than 12 V ,the actuation voltage, R will be connected to the circuit to limit the current and depressurize the voltage.As the charging of C1, C3 completes, relay J contacts and actuates to short-circuit R. At this moment, power supply will function properly.



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