(1) The cost of linear power supply is higher than that of switching power supply at a certain output power point.
Therefore, with the development and innovation of power electronics technology, the switching power supply technology continues to break through and innovate, which is a cost problem, but the switching power supply technology moves to the low output power end, providing a wide range of development space for the switching power supply.
(2) power electronic equipment and people's work, life is increasingly close, and electronic equipment is inseparable from reliable power supply, into the 80s after the computer fully realized the switching power supply, to the 90s switching power supply has entered a variety of electronics, electrical appliances field.
(3) In fact, it can be understood from the schematic diagram of the switching power supply: it does not use a bulky power frequency transformer, and at the same time, because the dissipated power on the adjustment tube is greatly reduced, a larger heat sink is omitted. This makes the switching power supply smaller and lighter. However, the biggest advantage of switching power supply is low power consumption and high efficiency. In the switching power supply circuit, under the excitation of the excitation signal, the transistor constantly repeats the switching state of "on" and "off", and the conversion speed is extremely fast, and the frequency is only 50HZ, which greatly improves the power supply efficiency.
(4) Wide range of voltage regulation of switching power supply. The output voltage from the switching power supply is adjusted by the duty cycle of the excitation signal, and the change in the signal voltage of the input signal can be compensated by frequency modulation or width modulation. In this way, when the power frequency grid voltage changes greatly, it can still ensure a more stable output voltage.
(5) The working frequency of the switching power supply is basically working at 50kHz, which is 1000 times that of the linear regulated power supply, which improves the filtering efficiency after rectification by almost 1000 times; Even with half-wave rectification followed by capacitor filtering, the efficiency is improved by a factor of 500. Under the same ripple output voltage, when the switching power supply is used, the capacity of the filter capacitor is only 1/500-1/1000 of the filter capacitor in the linear regulated power supply.
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