1.Low power consumption and high efficiency. In the switching power supply circuit, the transistor V is alternately operated in the on-off and off-on switching states under the excitation of the excitation signal, and the conversion speed is fast, and the frequency is generally about 50KHZ. In some technologically advanced countries, Can do hundreds or nearly 1000KHZ. This makes the switching transistor V consume less power, and the efficiency of the power supply can be greatly improved, and the efficiency can reach 80%.
2. Small size and light weight. From the block diagram of the switching power supply, it can be clearly seen that no heavy power frequency transformer is used here. Since the dissipation power on the adjustment tube V is greatly reduced, a large heat sink is omitted. Due to these two reasons, the switching power supply is small in size and light in weight.
3. Wide voltage range. The output voltage from the switching power supply is regulated by the duty cycle of the excitation signal, and the change in the input signal voltage can be compensated by frequency modulation or widening. In this way, when the voltage of the power frequency grid changes greatly, it can still ensure a relatively stable output voltage. Therefore, the switching power supply has a wide voltage regulation range and a good voltage regulation effect. In addition, there are many ways to change the duty cycle. Designers can flexibly select various types of switching power supplies according to actual application requirements.