Average current mode controller for bridgeless PFC SEPIC converter with second-order model reduction operated in...

Area of Science:

• Electrical Engineering
• Power Electronics
• Control Systems

Background:

• Single-phase bridgeless power factor correction (PFC) circuits are crucial for efficient power conversion.
• Traditional controllers face challenges in maintaining high power factor and efficiency, especially at higher power levels.
• Single Ended Primary Inductor Converters (SEPIC) offer advantages but require sophisticated control strategies.

Purpose of the Study:

• To propose and validate an Average Current Mode Controller (ACMC) for a single-phase bridgeless SEPIC PFC circuit.
• To demonstrate the controller's ability to achieve high power factor (PF) and efficiency up to 350 W.
• To detail the design and implementation of the ACMC for continuous conduction mode (CCM) operation.

Main Methods:

• Second-order model reduction was employed for controller design.
• Theoretical analysis of the SEPIC PFC circuit operation under ACMC was performed.
• MATLAB/Simulink simulations and experimental validation were conducted on a 350 W prototype.

Main Results:

• The proposed ACMC effectively forces the input current to follow a sinusoidal reference.
• High power factor (PF) and high efficiency were achieved at power levels up to 350 W.
• Experimental results validated the simulation findings, confirming the controller's performance.

Conclusions:

• The developed ACMC is a superior control strategy for single-phase bridgeless SEPIC PFC circuits.
• The controller ensures high efficiency and power factor across various operating conditions.
• The study confirms the effectiveness and practical applicability of the proposed ACMC.