Separation of AC and DC Flux Linkage Using the Example of Buck Converters

The buck converter is a basic component for power electronic DC/DC and DC/AC converters. Due to pulse width modulation (PWM), there is an undesirable ripple current in the output current. Various concepts exist to reduce the weight and increase the power density, such as increasing the frequency, interleaved operation, and magnetic coupling of the phases. The paper investigates the main processes involved in magnetic phase coupling and derives conclusions on the design of inductive devices for high-power density converters. The effectiveness is demonstrated by elementary application examples.