A power supply is an electrical device that supplies electric power to an electrical load. The primary function of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load. As a result, power supplies are sometimes referred to as electric power converters. It includes the Hi-Link Power Supply Module, SMPS, Power Adapter.

Some power supplies are separate standalone pieces of equipment, while others are built into the load appliances that they power.SMPS stands for switch-mode power supply. Its job is to convert wall-voltage AC power to lower voltage DC power. Hi-Link Power Supply Module is a plastic enclosed PCB mounted isolated switching step-down power supply module.