Power Supply

A power supply is an electrical device that converts electric power from a source (typically mains AC) into the correct voltage, current, and frequency required to load a device. Its primary function is to deliver stable, regulated power to electronic circuits, motors, or other equipment.

Most electronic components operate on low-voltage DC (e.g., 5V, 12V, 24V), while utility grids provide high-voltage AC (e.g., 120V/230V). A power supply bridges this gap. It generally consists of a transformer (steps voltage up or down), a rectifier (converts AC to DC), a filter (smooths ripples), and a regulator (maintains constant output despite input or load variations).

Power supplies are categorized as linear or switching. Linear supplies offer very low noise but are bulky and inefficient for high power. Switching power supplies (SMPS) are compact, efficient (80–95%), and widely used in computers, chargers, and industrial controls.

Applications range from phone chargers and LED drivers to PLC systems, CNC machines, and server racks. Without a reliable power supply, sensitive electronics would see voltage spikes, poor performance, or permanent damage. It is, quite literally, the provider of usable energy for every electrical device.