It includes current limiting, thermal overload protection, and safe operating area protection. The device features a typical line regulation of 0.01% and a typical load regulation of 0.1%. It requires only two external resistors to set the output voltage. In this article, I will discuss two methods of LM317 current boosting, using power PNP and NPN pass transistors.Īccording to the LM317 datasheet: “The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. However, the chip can deliver currents up to 1.5A which is not enough for some power applications. The output voltage of the regulator can be adjusted from 1.25V to 35V. I used these to charge my 30Ah lead-acid inverter battery. This circuit is tested under labs.LM317 is one of the most popular adjustable regulator chips. Proper heat sink must be provided for the power transistors.Correspondingly the emitter voltage of power transistor 2N3055 is varied. By varying the resistance of potentiometer output voltage of LM317 IC can be varied.Collector of 2N3055 connected to Vcc and Emitter of each transistor are looped together to get output terminal.In this circuit the output from LM317 directed to parallel combination of 2N3055 power transistors which will increase the output current hence the power also.2N3055 power transistor can handle a maximum of 115 watts and the maximum collector current is 15A.Here the first section of circuit is same as before but in order to boost current we are using 2N3055 transistor.We have already discussed LM 317 Variable DC Power supply, but it was low current. Output of LM317 variable voltage regulator in connected to the base of 2N3055 power transistor.Output voltage of this IC can be varied between 1.25V and 37V.! Yes, this is the best choice of variable power supply circuits. As you know LM317 is a variable voltage regulator IC.Working Procedure of High Current Adjustable Power Supply Circuit High Current Adjustable Power Supply Circuit DiagramĬomponents Required for Variable Power Supply The maximum input to this DC variable power supply is 37 volts. This can be used as a regulated 48V DC power supply or 24 V DC power supply. 2N3055 can handle 15A, so by connecting parallel make add the individual currently. So I connected a power transistor which helps to increase the current without varying the voltage. My 30Ah lead-acid inverter battery takes more time for constant voltage charging when I use an LM317 variable voltage regulator. I happened to design a high current adjustable power supply circuit schematic diagram for my inverter battery for safe and quick charging. The current handling capacity can be increased simply by connecting 2N3055 power transistors in parallel. So to get through such problems I introduce a high current variable voltage power supply circuit that can drive 10A of load. They can’t drive high power devices like a motor or high power lamps. Variable power supplies are available in different ranges but they provide a very low current of one or two amperes.
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