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The structural principle of switching power supply

source:power supply     Popular:adapter     release time:2021-03-15 14:47:50     Article author:sznbone    

  The control structure and composition principle of the switching power supply is the success of a switching power supply product. The quality aspect is the main reference basis. In addition to whether the relevant parameters meet the standards, other aspects also need to be paid attention to. To achieve a good grasp of the quality and related parameters of these switching power supplies, it is necessary to spend more thoughts on the design of the switching power supply. This requires the designer to have a deep understanding and high technical ability in the selection of the various components of the switching power supply, the design of the circuit and the control principle of the switching power supply. This article gives you a brief introduction to the control principle of switching power supply.

The structural principle of switching power supply(图1)

  One, the control structure of the switching power supply is normal, there is no big difference

  Generally, the switching power supply is composed of input circuit, output circuit, control circuit, converter, and four main bodies. If the division is more detailed, it can be divided into: input filtering, input rectification, switching circuit, sampling, reference power supply, comparison amplifier, oscillator, V/F conversion, base drive, output rectification, output filter circuit, etc. The actual switching power supply also has a protection circuit, a power factor correction circuit, a synchronous rectifier drive circuit, and other auxiliary circuits. Depending on the type of control, the PM (pulse modulation) circuit may have many forms. Here is a typical PFM structure.

  2. The composition principle of switching power supply mainly has four aspects

  The first is the conversion circuit: the second is the output circuit: the third is the control circuit: the fourth is the input circuit. Due to the limitation of the content of the layout, the principle of switching power supply can only be briefly introduced for everyone.

  Due to too much content, specific aspects will be scattered in the subsequent updates. There are still a lot of information on the Internet, and the main work is to collect and sort from the Internet, and then consult the company’s technical staff to edit it to help users as much as possible.


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