China switching power supplies, also known as switching power supply and switching converter, is a high-frequency electric energy conversion device and a type of power supply. The function of China switching power supplies is to convert a level of voltage into the voltage or current required by the user through different forms of architecture. The input of China switching power supplies is mostly AC power or DC power, and the output is mostly a device that requires DC power, such as a personal computer, and China switching power supplies converts the voltage and current between the two.

China switching power supplies is different from the linear power supply. Most of the switching transistors used in the China switching power supplies are switched between the fully open mode and the fully closed mode. These two modes have the characteristics of low dissipation, and the conversion between switching will have high consumption, but for a short period of time, thus saving energy and generating less waste heat. Ideally, China switching power supplies itself does not consume power. Voltage regulation is achieved by adjusting the turn-on and turn-off times of the transistors. On the contrary, in the process of generating the output voltage of the linear power supply, the transistor works in the amplifying area, and it also consumes power. The high conversion efficiency of China switching power supplies is one of its major advantages, and because China switching power supplies has a high operating frequency, a small-sized and light-weight transformer can be used, so China switching power supplies will also be smaller and lighter than the linear power supply.