Switching power supply principle

      The control structure and composition principle of the switching power supply is successful in the product of a switching power supply. The quality aspect is the main reference. In addition to whether the relevant parameters meet the standards, other aspects need to be noted. In order to grasp the quality of these switching power supplies and related parameters, it is necessary to pay more attention to 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 components of the switching power supply, the design of the circuit and the control principle of the switching power supply. This article gives you some simple introductions on the control principle of switching power supplies.

      one. The control structure of the switching power supply is normal, there is no big difference.

      Generally, the switching power supply is composed of an input circuit, an output circuit, a control circuit, a converter, and four main bodies. More detailed division can be divided into: input filtering, input rectification, switching circuit, sampling, reference power, comparison amplification, oscillator, V / F conversion, base drive, output rectification, output filter circuit. The actual switching power supply also has a protection circuit, a power factor correction circuit, a synchronous rectification drive circuit, and other auxiliary circuits. Depending on the type of control, PM (Pulse Modulation) circuits can take many forms. Here is a typical PFM structure.

      two. There are four main aspects to the construction of a switching power supply.

      The first one 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 layout content, the principle of switching power supply can only be introduced briefly. The specific aspect will be distracted in the subsequent updates due to too much content. There are still many online materials like these. The main work is still collected from the Internet, and then consulted the company's technical staff to edit and give users as much help as possible.