A high‐power quality battery charger for light electric vehicle using switched inductor PFC converter

Abstract

Abstract This work is focused on a new power quality improved battery charger for electric vehicle using a two switch power factor correction (PFC) single‐ended primary inductance converter (SEPIC) at the front‐end followed by a flyback converter. The single‐ended primary inductance converter is a high step‐up PFC converter with a switched inductor configuration at the input. Over a conventional single‐ended primary inductance converter, this new configuration operates with reduced duty ratio for a given DC‐link voltage. By using few additional components, this new single‐ended primary inductance converter offers reduced switch voltage stress to produce the same DC‐link voltage. The operation at lower duty cycle, gives the improved efficiency over a conventional SEPIC PFC converter. The built‐in advantage of soft switching in devices, is achieved due to discontinuous conduction mode based design for both power factor correction converter and flyback converter. The power quality improvement in charger is validated at steady state as well as under variation in input voltage and DC‐link voltage, to meet the IEC 61000‐3‐2 regulations. Performance of this charger is verified in constant current mode with high step‐up gain of power factor correction converter and lower stress across the devices over a conventional single‐ended primary inductance configuration.

Keywords

• Power electronics, supply and supervisory circuits
• Power supply quality and harmonics
• DC‐DC power convertors
• Transformers and reactors
• Transportation