What are the advantages of switching power adapters?

Most engineers are aware of the AC/DC switching power adapter chip (or module). As long as it is combined with some resistive and capacitive components and a switching transformer, it can be made into a basic switching power adapter. Generally speaking, the commonly used low-voltage AC switching power adapter rectifies the 220VAC power directly into an AC voltage of about 300V after passing through the EMI filter. It controls the switching tube through the circuit to conduct high-speed on and off and then converts it into high-frequency AC power for supply to the transformer. Transform the voltage to produce the required set or sets of voltages, and then rectify the AC power into the required voltage.

The main working principle of the ordinary half-bridge switching power adapter is that the switching tubes of the upper bridge and the lower bridge (the switching tube is VMOS when the frequency is high) are turned on in turn. First, the current flows through the upper bridge switching tube, and the storage function of the inductor coil is used to transfer the electric energy. It is gathered in the coil, finally turns off the upper bridge switch tube, opens the lower bridge switch tube, and the inductor coil and capacitor continue to supply power to the outside. Then turn off the lower bridge switch tube, then open the upper bridge to let the current enter, and repeat this process. Because the two switching tubes need to be switched on and off in turn, it is called a switching power adapter.

As a switching power supply IC in AC-DC power adapter. Key benefits of AC/DC switching power adapters:

a: Small size and light weight (the size and weight are only 20% to 30% of the linear power adapter),

b: High efficiency (generally 60% to 70%, while the linear power adapter is only 30% to 40%),

It has strong anti-interference ability, wide output voltage range and modularity.