This paper investigates the design, performance, and application of a novel coupled inductor suitable for interleaved parallel circuits. Through theoretical analysis and experimental verification, the novel coupled inductor exhibits superior electrical and magnetic properties in interleaved parallel circuits. This paper first introduces the basic principles of interleaved parallel circuits and the fundamental concept of coupled inductors, then elaborates on the design concept, equivalent circuit model, and application effects of the novel coupled inductor in interleaved parallel circuits.
Keywords: interleaved parallel circuit; novel coupled inductor; equivalent circuit model; magnetic properties
I. Research Background
With the rapid development of power electronics technology, interleaved parallel circuits, as a highly efficient power conversion method, have been widely used in power supplies, motor drives, and other fields. Interleaved parallel circuits achieve high efficiency, low ripple, and high power output by interleaving the control of multiple identical circuit modules. However, the complexity of this circuit structure also presents challenges, especially in the design and performance optimization of its key component—the coupled inductor.
While traditional coupled inductors play a role in interleaved parallel circuits, their performance still needs improvement. On the one hand, the core design of traditional coupled inductors is relatively simple, making it difficult to separate energy storage and filtering capabilities, thus limiting circuit performance. On the other hand, traditional coupled inductors are prone to overheating and saturation in high-frequency and high-power applications, affecting the stability and reliability of the circuit.
II. Current Status of Research
Currently, scholars both domestically and internationally have conducted extensive research on the application of coupled inductors in interleaved parallel circuits. Some scholars have attempted to improve the performance of coupled inductors by modifying the core structure and optimizing circuit design. For example, some studies have proposed novel coupled inductor design schemes that separate energy storage and filtering capabilities by splitting the magnetic components; other studies have focused on reducing losses and improving efficiency of coupled inductors by optimizing circuit parameters and control strategies.
However, most of these studies focus on specific circuit structures and application scenarios, lacking universality and systematicity. Furthermore, the performance of the novel coupled inductors in practical applications still requires further verification and optimization.
III. New Discoveries
In this paper, we propose a novel coupled inductor design scheme suitable for interleaved parallel circuits. This scheme achieves separation of energy storage and filtering capabilities through component splitting and optimized design, thereby improving the overall circuit performance. Specifically, the novel coupled inductor employs a special core structure, enabling it to maintain low losses and high efficiency in high-frequency and high-power applications. Furthermore, we derive the simplified circuit structure of the novel coupled inductor using the characteristics of port networks, and provide its transformer equivalent circuit model and mutual inductance representation equivalent circuit model.
Through theoretical analysis and experimental verification, we found that the novel coupled inductor exhibits superior electrical and magnetic characteristics in interleaved parallel circuits. Compared with traditional coupled inductors, the novel coupled inductor has lower losses, higher energy storage efficiency, and better stability. Furthermore, we verified the application effect of the novel coupled inductor in a two-phase interleaved parallel Boost converter through simulation and experiments. The results show that it can significantly reduce the output voltage ripple and improve circuit stability.
In summary, novel coupled inductors have broad application prospects and significant research value in interleaved parallel circuits. In the future, we will continue to conduct in-depth research on the performance optimization and application expansion of novel coupled inductors to promote the further development of power electronics technology. Interleaved parallel circuits are circuit structures that utilize multiple identical circuit modules through interleaved control to achieve high efficiency, low ripple, and high power output. Coupled inductors are components that achieve energy transfer through magnetic coupling between two or more coils. In interleaved parallel circuits, coupled inductors play a crucial role, and their performance directly affects the output voltage stability and ripple magnitude of the circuit.
