A simple power supply 1,5-30 volts 5 amps. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Power Supplies

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The power supply is made on the basis of two microcircuits and, in addition to them, contains only a few discrete elements. In this regard, it is easy to manufacture and configure. At the same time, the power supply is characterized by high performance, such as smooth voltage regulation over a wide range, low ripple, output current up to 5A with the ability to stabilize the current, high reliability. Also, the power supply has short circuit protection.

(click to enlarge)

The transformer used is the one that produces 25-35 Volts on the secondary winding and at a current of 5 A, its output voltage does not decrease much. 2 4700uF capacitors connected in parallel provide low ripple even before the integrated voltage regulator on the LM338. Potentiometer P1 can change the output voltage of the power supply from 1.5V to 25V. It is convenient to install two potentiometers in series for coarse and fine voltage adjustment. The double switch SW2 connects or disconnects the current stabilizer made on the LM317 chip. The current stabilizer allows you to limit the output current of the power supply within 0 ... 1.5 A

Instead of potentiometer P2, it is better to use a switch with 8-10 fixed values, since it is difficult to set the desired current with a potentiometer. The table gives approximate values ​​​​of the output maximum current, depending on the value of the resistor connected between the Adj and Out legs of the LM317 chip

The power supply in current stabilization mode is convenient to use for charging batteries with a capacity of up to 15Ah.

The instrument uses a 30V voltmeter and a 5A ammeter.

Both microcircuits are equipped with heatsinks, since they tend to heat up, especially at high output currents, it is advisable to use thermal paste. Naturally, the radiators are different and do not contact each other. A good heat sink will ensure reliable operation of the device. The board, transformer and all controls and indications are placed in a spacious case, there are holes in the case for air circulation.

LM338 Housing - out LM317

Transformer winding method: first, the first winding is wound turn to turn. Then we wind the secondary winding in the same way until the entire ring is filled.

Author: Andrey Veselov; Publication: cxem.net

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