A detailed analysis of the control principles of common switching power supplies worth learning

With the rapid development of society, our switching power supply is also developing rapidly, so do you know the detailed analysis of the switching power supply? Next, let the editor lead you to understand the relevant knowledge in detail.

With the rapid development of society, our switching power supply is also developing rapidly, so do you know the detailed analysis of the switching power supply? Next, let the editor lead you to understand the relevant knowledge in detail.

The control structure and composition principle of the switching power supply is the success of a switching power supply product. Quality 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 these qualities and related parameters, you need to pay more attention to the design of the switching power supply.

A detailed analysis of the control principles of common switching power supplies worth learning

Switching power supply is a voltage conversion circuit. Its main work content is to increase and reduce pressure. It is widely used in modern Electronic products. Because the switching transistor always works in “on” and “off” states, it is called a switching power supply. The switching power supply is essentially an oscillating circuit. This way of converting electrical energy is not only used in power circuits, but also widely used in other circuits, such as LCD backlight circuits, fluorescent lamps, and so on. Compared with transformers, switching power supplies have high efficiency, good stability and small size. The disadvantage of the switching power supply is that the power is relatively small, which will cause high-frequency interference to the circuit, and the circuit is complicated and difficult to maintain.

Generally speaking, the switching power supply is composed of input circuit, output circuit, control circuit, converter, and four main bodies.

There are three control principles of switching power supply:

The first is a constant switching cycle at the end of the pulse width adjustment, and the empty ratio can be changed by changing the pulse width;

The actual switching power supply also has a protection circuit, a power factor correction circuit, a synchronous rectification drive circuit and some other auxiliary circuits. Depending on the type of control, PM (Pulse Modulation) circuits may have many forms.

The second is the pulse frequency adjustment, the on-pulse width is constant, and the duty cycle is changed by changing the frequency of the switch operation;

There are mainly four aspects to the composition principle of switching power supply.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 switching power supply

The third is the method in which both the on-pulse width and the switching operating frequency are not fixed and can be changed by mixing. It is a mixture of the above two methods.

The above is a detailed analysis of the relevant knowledge of the switching power supply. We need to continue to accumulate experience in practice so that we can design better products and better develop our society.

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