Stabilized voltage power supply and switching power supply are different types of power supplies, and there are obvious differences between them. A regulated power supply is a type of power supply with a stable output voltage, which can effectively control the fluctuation range of the output voltage and ensure the normal operation of the circuit; And switch mode power supply is a type of power supply with high efficiency and energy saving characteristics, also known as switch mode power supply or switch mode conversion power supply, which is used to convert input electrical energy into the required output electrical energy.

The basic principle of a regulated power supply is to add a feedback circuit to the output terminal of the power supply to monitor the voltage at the output terminal. When the voltage fluctuates, the feedback circuit will adjust the output terminal voltage to ensure the stability of the output voltage. The working principle of a regulated power supply is relatively simple, but it has good stability and low noise. There are two common types of regulated power supplies: linear regulated power supplies and open-loop regulated power supplies.

A linear regulator power supply is a simple regulator power supply that ensures the stability of the output voltage by reducing the input voltage to a stable output voltage. The conversion efficiency of linear regulated power supply is relatively low, but its output voltage is more stable, with less noise, and does not generate electromagnetic interference.

The open-loop regulated power supply adopts the principle of feedback circuit. By comparing the voltage signal at the output terminal of the power supply with the set value signal, the output voltage of the power supply is adjusted to achieve a stable output voltage. Open loop regulated power supply has higher conversion efficiency, wider voltage input range, and better stability and reliability.

On the other hand, switch mode power supply is a nonlinear power supply that uses high-frequency switching technology, unlike the case where power is only supplied through linear components. The main advantage of switch mode power supply is that it generates power with high efficiency and low current, and the output current and voltage can be adjusted freely. The principle of a switching power supply is to convert direct current into high-frequency pulse signals, and then output the converted current into stable direct current through a high-frequency transformer and rectifier circuit. Switching power supplies have the characteristics of good power integration, controllability, high-frequency multi-level modulation, low noise, and strong overload capacity.

Compared to regulated power supplies, switch mode power supplies have a more stable and accurate output voltage, but slightly higher fluctuation noise in the output because their outputs are all direct current and can operate under a wide range of input voltages and output loads. At the same time, there is a controller that implements protection functions and can also adjust and limit output power to ensure the safety of power supply and load.

In short, both regulated power supplies and switching power supplies have their own advantages and disadvantages. We can choose a power supply that suits our needs to better ensure the normal operation of circuits and equipment.