1. small volume and light weight. Switching power adapter does not use heavy power frequency transformer. As the dissipation power on the switch MOS transistor is greatly reduced, a large heat sink is omitted. Because of these two reasons, the switching power adapter is small in size and light in weight.
2. low power consumption and high efficiency. In the switching power adapter circuit, under the excitation of the excitation signal, the switching MOS tube alternately works in the on-off and off-on switching states. The switching speed is very fast, and the frequency is generally above 50KHz. In some advanced switching power lines, it can reach hundreds or nearly megahertz. This makes the power consumption of switching MOS transistor very small, and the efficiency of power supply can be greatly improved, and its efficiency can reach 90%.
3. the filtering efficiency is greatly improved and the capacity and volume of the filtering capacitor are greatly reduced. At present, the operating frequency of the switching power supply adapter is basically above 50KHz, which is more than 1000 times that of the linear regulated power supply adapter, which almost improves the filtering efficiency after rectification by 1000 times; Even if half wave rectification is adopted followed by capacitor filtering, the efficiency is also improved by 500 times. Under the same ripple output voltage, when switching power supply is used, the capacity of filter capacitor is only 1/500 ~ 1/1000 of that of linear regulated power supply.
4. wide voltage stabilization range. The output voltage of the SMPS adapter is regulated by the duty cycle of the excitation signal, and the change of the input signal voltage can be compensated by frequency modulation or width modulation. In this way, when the power frequency network voltage changes greatly, it can still ensure a more stable output voltage. Therefore, the voltage stabilizing range of switching power adapter is very wide, and the voltage stabilizing effect is very good. In addition, there are two ways to change the duty cycle: pulse width modulation and frequency modulation. Switching regulated power supply not only has the advantages of wide range of voltage stabilization, but also has many methods to achieve voltage stabilization. Designers can flexibly select various types of switching power supply IC chip schemes according to the requirements of practical applications.
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