Switching power supply is a kind of power supply that uses modern power electronics technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFETs. With the development and innovation of power electronics technology, switching power supply technology is constantly innovating. Switching power supply is widely used in almost all electronic equipment due to its small size, lightweight, and high efficiency. It is an indispensable power supply method for the rapid development of the electronic information industry today.