How linear sockets work

Update:17-05-2019
Summary:

The linear socket is similar to the tap water pipe. Sin […]

The linear socket is similar to the tap water pipe. Since there is no switch, the water pipe is always draining water. If there is too much water, it will leak out. This is the MOS tube of some linear sockets that we often see is very hot. All the incomplete power is converted into heat. From this point of view, the conversion efficiency of the linear socket is very low, and when the heat is high, the life of the component is necessarily lowered, which affects the final use effect.
Since the power device of the linear socket operates in a linear state, its working efficiency is low, generally 50%-60%. The working mode of the linear socket makes it necessary to have a step-down transformer from high voltage to low voltage, and then rectify and output the DC voltage, which results in a large volume, bulkiness, low efficiency, and large heat generation. Of course, linear sockets also have advantages: small ripple, good adjustment rate, and low external interference, suitable for analog circuits and various amplifier fields.
The power device of the switch socket works in the switch state (one open and one off, the frequency is very fast, the frequency of the general flat switch socket is 100-200 kHz, the module power supply is 300-500 kHz), and it requires the transformer, and needs high magnetic Conductivity of the material to make the transformer.