Advantages of switching power supply:
Power Supply Switching has low power consumption、high efficiency. Under the excitation signal, the transistor alternately works in the switching state, the conversion speed is very fast, the frequency is generally about 50KHZ, can do several hundred KHZ or nearly 1000KHZ, which makes the switching transistor power consumption is very small, the power efficiency can reach 80%.
Power Supply Switching has small size, light weight. No bulky power frequency transformer is used, because the dissipation power on the adjustment tube is greatly reduced, save the large heat sink.
Voltage regulator range is wide, the output voltage of switching power supply is regulated by the duty ratio of the excitation signal, the change of input signal voltage can be compensated by frequency modulation or width, in the power frequency grid voltage change is large, still can ensure a stable output voltage.
The efficiency of the filter is greatly improved, and the capacity and volume of the filter capacitor are greatly reduced. The filter capacitor is only 1/500-1/1000 of the linear regulated power supply.
Circuit forms are flexible and varied, there are self-excited and other excited, wide and frequency modulation, single - ended and double - ended and so on.
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