BCM-based active power factor correction circuit implementation - Power Circuit - Circuit Diagram

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Abstract: This article examines the topology and operational modes of rectifier circuits, focusing on the parameter selection criteria for such circuits. It also outlines the design methodology for a critical conduction mode (BCM) power factor correction Boost switching converter. Simulation outcomes indicate that the critical conduction mode active power factor correction (APFC) circuit, utilizing MC33262 as the core component, can produce a stable 400V DC output over a broad input voltage range of 90-270V. The power factor achieved is 0.99, showcasing excellent system performance and meeting the required design standards.
Keywords: active power factor correction (APFC); Boost converter; critical conduction mode (BCM); MC33262

1. Introduction: Active power factor correction (APFC) is a crucial approach for efficient and eco-friendly electricity utilization. By inserting a power conversion circuit between the bridge rectifier and the output capacitor filter, it ensures the power factor approaches unity. Operating in a high-frequency switching state, the active power factor correction circuit offers advantages like compact size, lightweight design, and high efficiency. Consequently, it has emerged as a prominent area of study within power electronics technology.
2. Working Modes of APFC: Active power factor correction circuits can be categorized based on the continuity of inductor current into Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM), and Boundary Conduction Mode (BCM). The characteristics of these modes are outlined in Table 1. The APFC circuit in this paper employs the Boundary Conduction Mode (BCM).

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This article delves into the intricacies of rectifier circuits, analyzing their topologies and operational modes. The discussion highlights the importance of selecting appropriate parameters for these circuits and introduces a method for designing a critical conduction mode (BCM) power factor correction Boost switching converter. The simulations demonstrate that the active power factor correction (APFC) circuit, using MC33262 as the central component, can maintain a steady 400V DC output across a wide input voltage spectrum of 90-270V. With a power factor of 0.99, the system exhibits superior performance, fulfilling all design objectives. The introduction emphasizes the significance of active power factor correction (APFC) in optimizing energy efficiency while minimizing environmental impact. By integrating a power conversion circuit between the bridge rectifier and the output capacitor filter, APFC ensures that the power factor approaches unity. Operating in a high-frequency switching state, APFC circuits provide benefits such as reduced size, lighter weight, and enhanced efficiency, making them a focal point in modern power electronics research. In exploring the working modes of APFC circuits, this paper categorizes them into Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM), and Boundary Conduction Mode (BCM). Each mode's characteristics are summarized in Table 1. For this study, the Boundary Conduction Mode (BCM) was chosen due to its unique advantages and suitability for specific applications. The accompanying image [3][4] provides additional visual insights into the discussed concepts, further enhancing the understanding of APFC circuits and their practical implementations.

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