Volume 15, Issue 4

Design and Analysis of Modified Bridgeless AC to DC Interleaved ZETA Converter for Electric Vehicle Charging Application

Author

Thangasankaran R, Dr S Parthasarathy, Rageshwaran J K, Bharath Kumar P G, Janagivarman B, Murugan I

Abstract

Effective AC-DC power conversion with low losses and enhanced power quality is a fundamental requirement for electric vehicle (EV) charging systems. Conventional EV chargers that employ diode bridge rectifiers suffer from significant conduction losses due to two simultaneous diode voltage drops (~1.4 V per cycle), increased input current ripple, elevated total harmonic distortion (THD), and degraded overall efficiency — all of which become increasingly severe at higher power levels. This paper presents the design and analysis of a Modified Bridgeless AC-DC Interleaved ZETA Converter for EV off-board charging applications. The proposed topology eliminates the conventional diode bridge by allowing the AC input to be processed directly through controlled MOSFET switches, thereby removing conduction losses and the dead-band distortion near zero crossings. Two ZETA converter stages operate in parallel with 180° phase-shifted PWM signals, distributing current stress uniformly and reducing the effective ripple frequency to 40 kHz — twice the switching frequency. The converter is rated at 300 W with a 60 V DC regulated output from a 230 V AC (RMS), 50 Hz grid supply at a switching frequency of 20 kHz. A PI controller provides precise voltage regulation. Performance is validated using MATLAB/Simulink 2024a under open-loop and closed-loop control, along with static (supply voltage variation) and dynamic (load variation) analyses. Results confirm near-unity power factor, THD compliant with IEC 61000-3-2, fast transient recovery, and stable DC output — demonstrating the proposed converter as a reliable solution for modern EV charging infrastructure.

DOI

https://doi.org/10.62226/ijarst20262646

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