The adjustment tube of the DC stabilized power supply works in an amplifying state, resulting in high heat generation and low efficiency. It requires a large volume of heat dissipation fins and also a large volume of power frequency transformer. When multiple sets of voltage outputs need to be produced, the transformer will be even larger. For places where the efficiency and installation volume of DC stabilized power supply are required, switch mode power supply is preferred. For places where electromagnetic interference and power supply purity are required. Also, the high-frequency transformer used in DC stabilized power supplies may be difficult to wind.

DC stabilized power supply and linear power supply have different internal structures. As the name suggests, switching power supply has switching action, which uses variable duty cycle or frequency conversion methods to achieve different voltages. The implementation is more complex, and the major advantage is the rate, which is generally above 90%. The disadvantage is that the ripple and switching noise are relatively large, which is suitable for occasions with low requirements for ripple and noise.

Linear power supply has no switching action and belongs to continuous analog control. Its internal structure is relatively simple, the chip area is small, and the cost is low. The advantages are low cost and low noise, but the major disadvantage is low efficiency. They each have their own shortcomings and complement each other in application.DC regulated power supplyIt mainly includes power frequency transformers, output rectification filters, control circuits, protection circuits, etc.

The DC stabilized power supply obtains unstable DC voltage through rectification and filtering in the rectification circuit. To achieve high-precision DC voltage, the output voltage must be adjusted through voltage feedback. This power supply technology is very mature and can achieve high stability with minimal ripple and no interference or noise from switching power supplies.

When a DC regulated power supply is input, it generally needs to pass through a type of eddy current coil to filter out interference on the power grid and also filter out interference from the power supply to the power grid; When the power is the same, the higher the switching frequency, the smaller the volume of the switching transformer, but the higher the requirements for the switching tube.DC regulated power supplyThe secondary winding can have multiple windings or one winding can have multiple taps to obtain the desired output. Generally, some protective circuits should be added, such as no-load, short circuit, etc., otherwise it may burn out the switching power supply.