Power supply is a device that provides power to electronic equipment, also known as power supply, which provides electrical energy required by all parts of the computer. The power, current and voltage stability of the power supply will directly affect the working performance and service life of the computer. The key components of the power supply are still some passive components and power components, such as capacitors, inductors, MOS, etc. Of course, it is also very important to choose a good capacitor. Safety capacitors are widely used in LED driving power supply, street lamp power supply, stage lighting power supply, switching power supply and other household appliances and control boards.