Its core feature is the use of switching devices to convert the input DC voltage or current into high-frequency AC power, and then obtain stable DC output through rectification and filtering. Due to its high efficiency, small size, and good dynamic performance, high-frequency switching power supplies are widely used in fields such as power electronics, communication, and automation control. There are various control methods for high-frequency switching power supplies, and here we will introduce four common control methods.

Firstly, constant switching frequency control is one of the most common and basic control methods. The switching frequency is set to a fixed value, usually between tens of kHz and hundreds of kHz. By adjusting the on and off time of the switch tube, stable control of the output voltage and current is achieved.

Next is frequency conversion control, which controls the output voltage and current by changing the switching frequency. By changing the switching frequency, the ratio of the on and off time of the switch tube can be changed, thereby changing the average output voltage and current. This control method is commonly used in situations where real-time adjustment of output power is required based on load changes.

The third type is pulse width modulation control, which is a control method that adjusts the output voltage and current by changing the conduction time of the switch tube. PWM control technology changes the average value of output voltage and current by changing the proportion of the on time of the switch, i.e. the pulse width. PWM control method has the characteristics of fast response speed and good stability, and is widely used in high-frequency switching power supplies.
Finally, there is multi-level control, which is a new control method developed in recent years. Multi level control achieves control of output voltage and current by dividing the power output into multiple levels. Each level has its own switch and control circuit, and by controlling the on and off time of each level of switch, the output voltage and current values can be accurately adjusted. The multi-level control method has the characteristics of high accuracy and reliability, and is suitable for situations with high output accuracy requirements.

In practical applications, suitable switching power supply control methods can be selected according to the needs of different scenarios. The four control methods introduced above have their own advantages and disadvantages, and the most suitable control method needs to be selected based on specific usage scenarios and equipment performance requirements. With the development of power electronics technology, the application of high-frequency switching power supplies will become increasingly widespread, and their control methods will continue to innovate and improve to adapt to higher efficiency and stricter environmental requirements.