tehoadapter

A tehoadapter, often referred to as a power adapter, is a device that provides electrical power to an electronic device by converting mains electricity to the voltage, current, and connector configuration required by the device. Adapters can be external, known as wall warts, or built into the device itself.

Most teho adapters fall into two broad categories: linear power supplies and switching-mode power supplies (SMPS). Linear adapters use a transformer and linear regulation, producing very clean output but generally larger and less efficient. Switching-mode adapters convert power at high frequency and typically offer higher efficiency and compact size; they are commonly used as external wall-wart units as well as internal supplies.

Electrical characteristics include an input in the range of typical mains voltages (about 100–240 V AC, 50/60 Hz) and an output that is regulated DC at specified voltages (for example 5 V, 9 V, 12 V, 19 V, 20 V) with a current rating sufficient for the connected device. Many modern adapters also supply power via USB-C with negotiation standards such as USB Power Delivery. Connectors vary, and proper polarity is important (most standard barrel connectors are center-positive).

Safety and standards: tehoadapter must provide galvanic isolation and protection against overvoltage, overcurrent, short circuits, and overheating. They bear certifications for safety and electromagnetic compatibility (for example CE, UL, RoHS) and often comply with energy efficiency requirements (no-load and active efficiency classes).

Practical considerations include matching the device’s required voltage and current, using the correct connector and polarity, and avoiding damaged or counterfeit adapters. Using an adapter that meets the device specification helps ensure safe operation and longevity.