Compared with the traditional stabilized voltage power supply ,switching power supply has the advantages of high efficiency, small volume, light weight, wide voltage range.
1.Small and light.
From the principle diagram of the switching power Adapters,we can see clearly that there is no heavy power frequency transformer here.Since the dissipation power of the regulating tube V is greatly reduced, large cooling fins are omitted. These are why the switching power supplies are small and light.
2.Low-power and high-efficiency.
In the switching power supply circuit, a transistor V in the excitation signal excitation, it alternately in the on-off switch and cut-off - conduction state, fast conversion speed, the frequency is about 50kHz, in some advanced countries, can do a few hundred or nearly 1000kHz. which makes the power of switch transistor V is small, the power efficiency can be greatly improved, the efficiency can reach 80%.
3.Wide voltage range.
The output voltage of the switching power supply(AC DC Adapters) is regulated by the duty ratio of the exciting signal, and the change of the input signal voltage can be compensated by frequency modulation or width adjustment.Thus, when the voltage of the power frequency network changes greatly, it can still guarantee a stable output voltage. Therefore, the switching power supply voltage regulator range is very wide, the voltage regulation effect is very good.Switching power supply not only has the advantage of wide voltage regulation range, but also has many ways to realize voltage stabilization. Designers can flexibly select all kinds of switching power supply according to practical application requirements.