Sometimes loading is calculated on power supply by smaller tension, than that which develops the available source. Besides, some loadings at power supply by the lowered tension work in the facilitated mode and longer serve. The way of undervoltage on the fed device depends on its type and parameters.
Instruction
1. Before lowering loading supply voltage, make sure that such lowering will really do it good. For example, in the halogen lamp the undervoltage can cause the termination of cycle of exchange of tungsten between thread and gas, and it will fuse even quicker, the electric motor at too small tension can stop, begin to consume the raised current and to fuse, and the pulse power supply unit or energy saving lamp — to begin to work in the adverse mode and to fail very quickly.
2. The simplest, almost universal way of undertension on loading — inclusion is consecutive with it the resistor. Pick up such resistor that it has sustained the power allocated on it. Efficiency at the same time will decrease a little. If you are completely sure that loading is active, use the element having reactive resistance — the condenser suitable in parameters or throttle. The condenser for safety to zashuntiruyta the megaomny resistor. In the presence of two identical active loadings connect them consistently.
3. Avtotranformator are applied to lowering (and increases) alternating voltage about century. Unlike transformers, they do not provide galvanic isolation, but have at the same power considerably smaller dimensions. The laboratory autotransformers (LATRY) allowing to regulate smoothly voltage output are especially convenient. Correctly pick up the autotransformer for power, and do not use it on direct current at all.
4. For lowering of small constant voltage with its simultaneous stabilization use the parametric or compensation stabilizer. The second is suited more difficult, but is more effective. The pulse stabilizer has higher efficiency, but he can create hindrances to loading in which there are chains, sensitive to them.
5. Allow to transform high tension to low with simultaneous galvanic isolation from network power supply units of various designs. Such blocks — internal or external — are widely used as a part of the modern electronic equipment. Many of them are equipped with the built-in stabilizers. Correctly pick up such block depending on loading parameters (tension, current, sensitivity to hindrances).