1, low power consumption, high efficiency. In the switching power supply circuit, the most body tube V under the excitation signal, it alternately works in the on-off and cutoff switching state, the conversion speed is very fast, frequency is generally about 50kHz, in some advanced technology countries, can do several hundred or nearly 1000kHz. This makes the switching transistor V power consumption is very small, the efficiency of the power supply can be greatly improved, its efficiency can reach 80%.
2, small size, light weight. It is clear from the schematic diagram of the switching power supply that no bulky power frequency transformer is used here. The dissipation power on the dry adjusting tube V is greatly reduced, and a large heat sink is omitted. For these two reasons, the switching power supply is small in size and light in weight.
3, wide range of voltage regulation. The output voltage from the switching power supply is regulated by the duty ratio of the excitation signal, and the voltage variation 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, so the switching power supply voltage regulator range is very wide, voltage regulator effect is very good. In addition, there are two ways to change duty ratio: pulse width modulation and frequency modulation. Switching power supply not only has the advantage of wide voltage regulator range, but also has many ways to achieve voltage regulator. Designers can flexibly select various types of switching power supply according to the requirements of practical applications.
