Types and Selection of Stream Stabilized Power Supplies
DC stabilized power supply can be divided into chemical power supply, linear stabilized power supply and switching-type stabilized power supply, they have a variety of different types: chemical power supply We usually use dry cell batteries, lead-acid batteries, nickel-cadmium, nickel-metal hydride, lithium-ion batteries belong to this category, each with its own advantages and disadvantages. With the development of science and technology, and produced intelligent batteries; in terms of rechargeable battery materials, the United States researchers found that a manganese iodide, with which you can create a cheap, compact, long discharge time, many times after charging still maintains the performance of a good environmentally friendly rechargeable batteries. Linear stabilized power supply Linear stabilized power supply has a common feature is that its power device regulator tube working in the linear region, relying on the voltage drop between the regulator to stabilize the output. Due to the large static loss of the adjustment tube, it is necessary to install a large heat sink to dissipate heat. And because the transformer works at the frequency (50Hz), so the weight is larger. The advantages of this type of power supply is high stability, small ripple, high reliability, easy to make multiple, continuously adjustable output finished product. Disadvantages are large, bulky, relatively low efficiency. This type of stabilized power supply and there are many kinds of output properties can be divided into voltage stabilized power supply and current stabilized power supply and voltage stabilized and current stabilized in one of the stabilized voltage and current stabilized (double stabilized) power supply. From the output value can be divided into fixed-point output power supply, band switch adjustable and potentiometer continuously adjustable type. From the output indication can be divided into pointer indication type and digital display type and so on. Switching DC regulated power supply and linear regulated power supply is different from a class of regulated power is switching DC regulated power supply, its circuit type mainly has a single-ended flyback, single-ended positive excitation, half-bridge, push-pull and full-bridge. The fundamental difference between it and the linear power supply is that it transformer does not work at the frequency but works in tens of kilohertz to several megahertz. Function tube is not working in the saturation and cut-off region that is switching state; switching power supply is therefore named. Switching power supply has the advantages of small size, light weight, stability and reliability; disadvantages relative to linear power supply ripple is large (generally ≤ 1% VO (P-P), good can be done more than ten mV (P-P) or less). Its power can be from a few watts - a few kilowatts are products. Price of 3 yuan - more than ten thousand dollars / watt.
