The self-adapted adjustable stable power supply composed of LM317

Published:2011/6/14 20:23:00 Author:Borg | Keyword: self-adapted, stable power supply | From:SeekIC

In the figure is the self-adapted adjustable stable power supply composed of LM317. This power supply has LM317 as the power supply steady element, according to the voltage value, it self-shifts the circuit input voltage, by which it reduces the difference between the input voltage and output voltage, so the power consumption of the power supply is reduced. In the circuit, VT2, VD5, VW, R5, R6, C10 and the relay K compose the self-adapted shift circuit, when the output voltage V0 is lower thant 14V, VW is blocked because of the breakdown voltage is too low, and there is no current in it, VT2 is blocked, K is still, and the connector K-1 is closed, the second-stage AC current of 14V is linked to the stable circuit.



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