LED power supply is a kind of power supply, that device provides power to electronic equipment, and it is also a power supply. It is a device that converts alternating current into direct current through a transformer and a rectifier. This device is called a rectifier power supply, also known as a driving power supply. An electronic device that can provide a signal is called a signal source. Lithium batteries, dry batteries, rectified power supplies, and signal sources are sometimes called power supplies. The battery is divided into positive and negative levels.