Types and Selection of DC Stabilized Power Supply
DC stabilized power supplies can be divided into chemical power supplies, linear stabilized power supplies and switching stabilized power supplies according to their habits. Both fall into this category and each has its pros and cons.
With the development of science and technology, intelligent batteries have been produced; in terms of rechargeable battery materials, American researchers have discovered a kind of iodide of manganese, which can be used to manufacture cheap, compact, long-discharge time, and still maintain battery life after multiple charges. Environmentally friendly rechargeable battery with good performance. Linear stabilized power supply Linear stabilized power supply has a common feature that its power device adjustment tube works in the linear region, and the output is stabilized by the voltage drop between the adjustment tubes.
Due to the large static loss of the adjustment tube, it is necessary to install a large radiator to dissipate heat. And since the transformer works at power frequency (50Hz), it is heavy. The advantages of this type of power supply are high stability, small ripple, high reliability, easy to make multi-channel, and output continuously adjustable finished products. The disadvantage is that it is bulky, cumbersome, and relatively inefficient. There are many kinds of this kind of stable power supply, which can be divided into regulated power supply, regulated current power supply and regulated voltage and current (bi-stable) power supply integrating regulated voltage and regulated current in terms of output properties. From the point of view of the output value, it can be divided into fixed-point output power supply, band switch adjustment type and potentiometer continuously adjustable type. From the output indication, it can be divided into pointer indication type and digital display type and so on. Switching DC regulated power supply is different from linear regulated power supply. A kind of regulated power supply is switching DC regulated power supply. Its circuit types mainly include single-ended flyback, single-ended forward, half-bridge, push-pull and full bridge. The fundamental difference between it and a linear power supply is that its transformer does not work at power frequency but at tens of kilohertz to several megahertz. The functional tube does not work in the saturation and cut-off region, that is, the switching state; the switching power supply is named after this. The advantages of switching power supply are small size, light weight, stable and reliable; the disadvantage is that compared with linear power supply, the ripple is larger (generally ≤ 1% VO (P-P), good ones can be more than ten mV (P-P) or less) . Its power can range from several watts to several kilowatts. The price ranges from 3 yuan to more than 100,000 yuan/watt.
