A rectifier is an electrical device that converts alternating current into direct current. This is done by using semiconductors such as diodes or thyristors to direct the current flow in one direction, thus rectifying the alternating current. A DC power supply is often used in industrial equipment or electronics to provide a constant DC power supply. Rectifiers can come in a variety of sizes and designs, from small units to power electronic equipment to large systems to power manufacturing equipment. DC power supplies are used in a variety of applications, including automotive, aerospace, telecommunications, robotics and power. They are also often used in combination with other components such as voltage regulators, filters and protection circuits to ensure a safe and stable power supply.