How Switching Power Supplies and Linear Power Supplies Work
The power device of the linear power supply works in a linear state, that is to say, the power device is always working when it is used, so it leads to its low working efficiency, generally between 50[[%]]~60[[%]], and It must be said that he is a very good linear power supply. The working method of the linear power supply makes it necessary to have a voltage device to change from high voltage to low voltage. Generally, it is a transformer, and there are others like KX power supply, which then rectifies and outputs DC voltage. As a result, his volume is large, heavy, low in efficiency, and generates a lot of heat. He also has his advantages: small ripple, good adjustment rate, and small external interference. Suitable for use with analog circuits, various amplifiers, etc.
Switching power supply, its power devices work in the switching state, (one on and one off, one on and one off, the frequency is very fast, the frequency of general flat panel switching power supply is 100~200KHz, and the frequency of module power supply is 300~500KHz). In this way, its loss is small and its efficiency is high. There are also requirements for transformers, which must be made of materials with high magnetic permeability. It's a little ink, his transformer is just a word small. The efficiency is 80% to 90%. It is said that the best VICOR module in the United States is as high as 99%. The switching power supply has high efficiency and small size, but compared with the linear power supply, its ripple and voltage and current adjustment rate are discounted.
The working process of the main circuit of the linear power supply is that the input power supply is initially stabilized by the pre-stabilized voltage circuit, and then converted into a DC power supply through the isolation and rectification of the main working transformer, and then controlled by the control circuit and the single-chip microprocessor controller. The linear adjustment element is finely adjusted to make it output a high-precision DC voltage source.
