Multiphase Interleaved SEPIC Converter Using ADM Control loop Suitable for Hybrid Energy Source Integration

This paper details the design and simulation of a multiphase interleaved SEPIC DC/DC converter. The design employs a control technique based on an adaptive delta modulation control loop which has not been previously used in in interleaved SEPIC converters. The converter has a large range of output voltage to satisfy the requirements of the 24/48v, 12/24, and other schemes used in the Renewable Energy Systems (RES) and similar applications. The conception, analysis and simulation of SEPIC converter for 24/48V power systems in the multiphase interleaved scheme are presented. This converter is designed to operate in a Discontinuous Conduction Mode (DCM). The control loop is based on an Adaptive Delta Modulation (ADM) technique, which produces an unconventional PWM signal to drive the converter switches in a manner to insure stability. The performance of the system is evaluated and analysed against the parameters variation. The simulation results demonstrate clearly the benefits of the control technique employed and emphasise the features of the converter interleaving scheme such as reduced current and voltage ripples and high conversion efficiency. The results show that the system output is stable and remains within the desired specified limit for a range of varying input voltage and load.