Magnetic power supplies (also called magnetic inductive power supplies or magnetic chargers) use electromagnetic induction to transfer electrical energy between two coils (a primary coil in the power base and a secondary coil in the device) without physical contact—enabling wireless charging for smartphones, wearables, kitchen appliances, and industrial equipment. Unlike traditional wired power supplies (which rely on USB cables or power cords that can wear out or get damaged), magnetic power supplies offer convenient, cable-free charging while reducing the risk of electrical shock (no exposed ports).

The working principle is based on Faraday’s Law of Electromagnetic Induction: when an alternating current (AC) flows through the primary coil (in the charger base), it creates a magnetic field. This magnetic field induces an alternating current in the secondary coil (in the device), which is then converted to direct current (DC) to charge the battery. Most magnetic power supplies follow the Qi standard (a global wireless charging standard), ensuring compatibility with devices like iPhones, Samsung Galaxy phones, and wireless earbuds.

Key features include: charging distances of 2-10 mm (enough to accommodate phone cases), overcharge protection (the supply stops charging once the battery is full), and temperature control (prevents overheating during charging). Industrial magnetic power supplies (used for sensors or robotic equipment) are designed for harsh environments, with waterproof (IP67) and dustproof ratings. A user review of a magnetic phone charger noted that it was easier to use than wired chargers—simply placing the phone on the base started charging, even in low light. For consumer electronics, magnetic power supplies reduce cable clutter and wear; for industrial use, they eliminate the risk of damage from wired connections in moving parts. As wireless technology becomes more prevalent, magnetic power supplies are becoming an essential part of modern power delivery systems.