How To Reduce The Supply Voltage | Hi-Tech




How to reduce the supply voltage

Power supply in low current consumption can reach a higher voltage than specified on its case. This can lead to failure of the load. To avoid this, the output voltage must be reduced.

How to reduce the supply voltage

Instruction how to reduce the power supply voltage

Step 1:

Connect one power supply in parallel with several loads so that their total current consumption is about 80% of the limit. More can not raise - the unit will overheat. Note that if one of the loads fails in such a way that it ceases to consume current, the output voltage will increase, which could result in damage to the rest of the connected devices to the unit.

Step 2:

If there is no additional load, is connected in series with a resistor powered device. Resist him pick up empirically, until the voltage across the load will not be close to the nominal. Start with a large resistance, and then it gradually decreases. Resistor Power Select more than that which it is dispersed.

Step 3:

By including a diode in series with the load, it is possible to reduce the voltage on it by the amount of 0.25 to 0.5 V (the exact value depends on the diode type). The voltage drop across the diode is less dependent on current than using a resistor, so this option is best suited to applications that consume varying current.

Step 4:

To make the power supply voltage of the device connected to the power supply, almost unchanged, use a stabilizer. They are divided into parametric and compensation, the latter have a greater efficiency. If the power supply itself is not a pulse, can be installed in front of him ferroresonance stabilizer, but today this solution is rarely used. It can not be used as a stabilizer ferroresonant transformer itself a power transformer power supply - it is not designed for it.

Step 5:

Switching Regulators markedly effective not only parametric, but also compensation. You can also build a feedback loop on the output voltage directly to the switching power supply. Note that the output voltage can rise dramatically when random breakage of the feedback loop. Also do not use switching power supplies and regulators together with devices susceptible to interference with frequencies from tens of kilohertz to megahertz units.