Inversely Coupled Inductors With Small Volume and Reduced Power Loss for Switching Converters

The letter presents a patent of lateral coupled inductor structure and its applications in single-phase and multiphase dc–dc converters. The central processing units (CPUs), graphics processing units (GPUs), and field-programming gate arrays (FPGAs) in the latest servers and artificial intelligence (AI) systems are powered by multiphase dc–dc switching converters and require high current, small size, fast transient response and high efficiency. This single-turn lateral coupled-inductor structure reduces magnetic core size through inverse coupling and minimizes inductor direct current resistor power loss for high-current applications. The coupled inductor can be embedded inside a motherboard or a power module. The letter illustrates different implementations of the patent and provides solutions to the AI systems that require high current and small volume of the power converters.