The power supply with insufficient current consumption can develop a higher voltage than indicated on its case. This could damage the load. To avoid this, the output voltage must be reduced.
Instructions
Step 1
Connect several loads in parallel to one power supply unit so that their total current consumption is about 80% of the limit. You cannot increase it anymore - the block will overheat. Please note that if one of the loads fails in such a way that it stops consuming current, the output voltage will increase, which can lead to damage to the rest of the devices connected to the unit.
Step 2
If there are no additional loads, connect a resistor in series with the powered device. Select its resistance empirically, until the voltage across the load becomes close to the nominal. Start with a lot of resistance and then gradually lower it. Select the power of the resistor more than that which is dissipated on it.
Step 3
By connecting a diode in series with the load, you can reduce the voltage across it by an amount from 0.25 to 0.5 V (the exact value depends on the type of diode). The voltage drop across a diode is less current dependent than a resistor, so this option is better suited for loads that draw varying currents.
Step 4
To make the supply voltage of the device connected to the power supply almost unchanged, use a regulator. They are divided into parametric and compensation, the latter having a higher efficiency. If the power supply itself is not pulsed, you can install a ferroresonant stabilizer in front of it, but today this solution is rarely used. You cannot use the power supply transformer itself as a ferroresonant stabilizer transformer - it is not designed for this.
Step 5
Switching stabilizers are noticeably more efficient not only parametric, but also compensation ones. You can also integrate the output voltage feedback loop directly into the switching power supply. Note that if the feedback loop is accidentally broken, the output voltage can rise sharply. Also, do not use switching power supplies and stabilizers in conjunction with devices that are sensitive to interference with frequencies from tens of kilohertz to megahertz units.
