Universal Power Supply Module 3V-30V

Universal power supply module

This universal power supply circuit provides a variable voltage between 3-30 V. The power supply provides maximum current 1.5 A and with a few modifications and additions to modules can provide a higher current.

Adjustable regulator LM317 (U1) offers short-circuit protection and automatic current limiting at 1.5A. The input voltage to the regulator is supplied by DB1, a 4 A 100 PIV full-wave bridge rectifier. Capacitor C1 gives initial filtering. U1 provides extra electronic filtering included in the regulating function. The output level of the regulator is set by trim-pot R1. To prevent high-frequency oscillation Bypass capacitor added to the input and output of U1 . The current output of the transformer should be no less than 1.8 times the rated continuous-duty output of the supply. Which means that a 1.5-A supply should apply a 2.7-A transformer. For light or intermittent loads, a smaller 2.0-A transformer should be enough.

Wiring a 2nd Adjustable regulator LM317, U2, in parallel with U1 can be a quick and clean method to increase the current limiting threshold of the universal power supply to 3 A without having to sacrifice short-circuit protection. When more than 3 A is needed, the regulator module may be used to drive the base of one or more pass-transistors (see Fig. B).

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.


Tags: adjustable power supply LM317 power supply with current limit universal power supply variable power supply circuit

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