Power-supply of adjustable DC steady voltage part 11

Published:2011/5/29 20:15:00 Author:Ariel Wang | Keyword: adjustable, DC , steady voltage | From:SeekIC

After SLis gotten through, HL is lighted up.The 220V AC voltage is dropped down through T，commutated through UR，filtered through C1 and C2 and regulated through voltage regulation output circuit.It generates 5-30V DC voltage.You can adjust the resistance of RP2(output voltage fine adjustment control ) and RP3(output voltage coarse adjustment ). It can change the conduction ability of Vl-V4 and the voltage of emitter (b，e pole) ,then it wil change the output voltage.When it's over loaded by some reasons,try to make the output electric current increase to a certain level.Try to conduct V5,to stop V7 ,to make the 3 feet output voltage of IC 0V and to stop Vl-V4.Then the output voltage is disappeared.



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