Advice 1: How to reduce voltage

Unit power consumption when there is insufficient current can develop a higher voltagethan indicated on the case. This may cause the load to malfunction. To avoid this, the output voltage must be reduced.
How to reduce voltage
Connect to one power several loads in parallel so that their total current consumption accounted for about 80% of the limit. To enhance its not - the unit will overheat. Note that if one of the loads fails in such a way that it ceases to consume current, output voltage will increase, which can lead to damage other connected to the unit devices.
If no additional loads, are connected in series with the supplied device is a resistor. Resistance to his pick up experimentally, while the voltage at the load will not be close to nominal. Start with the big resistance, and then gradually lower it. Power resistor select longer that which it dissipates.
By including in series with the load diode, it is possible to reduce a voltage therein by an amount of from 0.25 to 0.5 (the exact value depends on the type of diode). The voltage drop across the diode is less dependent on current than when using a resistor, so this option is best suited for loads that consumes a changing current.
To make the voltage supply device connected to the unit poweralmost unchanged, use the stabilizer. They are divided into parametric and compensation, and the latter have a greater efficiency. If the unit power is not pulsed, it is possible to install a ferroresonant stabilizer, but today this solution is rarely applied. Cannot be used as a transformer ferroresonance stabilizer as the power transformer unit power - it is not designed for it.
Pulse stabilizers are more effective not only parametric, but also compensation. You can also embed a feedback loop for the output voltage directly to the switching power supply. Note that in case of an accidental open circuit to feedback the output voltage can rise sharply. Do not use pulse power supply units power supply and stabilizers, in conjunction with devices sensitive to interference with frequencies from tens of kilohertz to a few megahertz.

Advice 2 : How to reduce voltage

The need to reduce voltage industrial power line or power source of household equipment occurs quite often, for one reason or another. This can be done by applying a transformer or transformerless ways to reduce stress.
The damping resistor
You will need
  • transformer, resistor, capacitor
Device for reducing the voltage at the base of the transformers are usually used in alternating current. If there are surges, it is recommended to use stabilizing devices (ferroresonant stabilizers). The projected increase in voltage may compensate for an ordinary autotransformer. This device also will provide a reduction in the magnitude of the voltage within the specified range. At the heart of all these devices use different types of transformers.
For low-power consumers in alternating current you can use a damping resistor or capacitor. The value of the resistor (in ohms) can be calculated by the following formula: R = Uпад/I = (IP - U)/I. Capacitance (in microfarads) of the quenching capacitor can be calculated by the formula: C = 3200 I/, where R is the resistor value, Ohm; I is consumed by the device current, A; Uпад – voltage, which needs quenching resistor, In; IC – voltage network; U – voltage power supply devices, V.
To reduce the supply voltage in DC current, in most cases, are used sequentially included in the circuit the Zener diode, microbore stabilizer (ROLL) or switching Converter. Various types of these devices designed to reduce voltage to a certain value. The above electronic devices based on the properties of semiconductors. So their use requires a solid knowledge in electronic engineering.
Making the decision on choosing one of the above methods of reducing stress, it is necessary to follow the following algorithm:
to determine the amount by which required;
- choose one of the acceptable methods;
- to make calculations and make sure they are correct;
- perform all work with adherence to safety regulations;
- conduct the testing of circuits only when setting the rated fuses in electrical circuits.
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