A switching power supply is an electrical device that converts electrical power efficiently. Unlike traditional linear power supplies, which use resistors to regulate voltage, switching power supplies use high-frequency switching techniques to control the output voltage. This method allows them to be smaller, lighter, and more efficient, making them popular in various applications, from computers to televisions. These power supplies work by rapidly turning the input voltage on and off, creating a series of pulses. A transformer then steps down the voltage, and a rectifier converts it back to a steady output. This design minimizes energy loss, making switching power supplies a preferred choice for modern electronic devices.