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The Difference Between Switching Power Supply And Linear Power Supply Using Terminal Blocks!

The regulating tube of the switching power supply operates in saturation and cut-off state, so the heat generation is small, the efficiency is high (more than 75%) and the large-volume transformer is omitted. However, the DC output of the switching power supply will be superimposed with a large ripple (50mvat5voutputtypical), and the Zener diode can be improved at the output end. In addition, since the switching tube works, it will generate a large spike interference, and it also needs to be stringed in the circuit. Even the magnetic beads are improved. Relatively speaking, the linear power supply has no such defects, its ripple can be made very small (below 5mv), and the main terminal used for the switching power supply is a fence type terminal, such as 9500, 825, 611 and other terminals.

Switching power supply

Switching power supplies are preferred where power efficiency and installation volume are required. Linear power supplies are often used where electromagnetic interference and power purity are required (eg, capacitive leakage detection). In addition, when the circuit needs to be isolated, most of the dc-dc is used to supply the isolated part (dc-dc is the switching power supply from its working principle). Also, the high-frequency transformer used in the switching power supply may be troublesome to wind.

The linear power supply and the regulator's adjustment tube work in an amplified state, so the heat is large and the efficiency is low (about 35%). It is necessary to add a bulky heat sink, and also requires a large-sized power frequency transformer. In the case of multiple sets of voltage outputs, the transformer will be more bulky. In terms of the use of the terminal block, the main connector used for the linear power supply is the XH2.54 terminal.