Homemade maintenance and charging dual-function power supply circuit

Published:2011/7/13 4:53:00 Author:TaoXi | Keyword: Homemade, maintenance, charging, dual-function, power supply | From:SeekIC

Operating principle of the low voltage output: the 32V voltage of the transformer subprime stage is rectified by VD1-VD4 and filted by the C1, so we get the 45V DC voltage, this DC voltage changes into the stable output voltage through the integrated three-port voltage stabilizer LM338K, you can get the 1.25V-37V stable DC voltage from the output port by adjusting the potentiometer RP1. In the figure, the LED1 is the indicator light of the regulated power supply, R1 is the current-limiting resistance of LED1, C2 can be used to filter the high-frequency harmonic components of the power supply and eliminate the parasitic oscillation. The VD5 and VD6 can be used to prevent the input and output short circuits to protect the LM338K.



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