Analysis of coupled-inductor configuration for an interleaved high step-up converter

Abstract

High step-up converters are widely used in sustainable energy systems and recently used in automotive applications due to their high voltage gain capability. Nevertheless, with the purpose of obtaining a higher voltage gain, in comparison with conventional boost converters, current high step-up converters often employ additional multiplier cells, which may lead to significant cost-up and low power density. Therefore, a novel two-phase interleaved high step-up converter is proposed in order to minimize additional circuit volume used to achieve large voltage gain. The proposed converter addresses the purpose by a particular coupled inductor where three windings are installed in one or two cores. As a result, the proposed converter can achieve higher voltage gain than the conventional topologies by adding a winding and two diodes to the interleaved two phase boost chopper, besides the coupled-inductor configuration. This paper evaluates two arrangements of the coupled-inductor configuration of the proposed high step-up converter: 1. Three windings integrated in only one core and 2. Two independent inductors with a shared winding. The result revealed that the proposed converter shows higher voltage gain than the normal boost converter and the magnetic integration in the coupled-inductor configuration further increases the voltage gain by 20%.

Non-Isolated DC-DC Converters in Fuel Cell Applications: Thermal Analysis and Reliability Comparison

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Efficiency optimisation of an interleaved high step‐up converter

“…Martinez et al [14] presented a HSU converter with a higher gain than that of the conventional interleaved boost converter. This converter utilises the concept of interleaved phase and magnetic coupling to achieve very high gain [15, 16]. This attribute makes it an excellent choice for a modular PV inverter wherein high voltage gain is required.…”

The Study of the Operational Characteristic of Interleaved Boost Converter with Modified Coupled Inductor

“…High power levels are mostly problematic, because of the increase of conduction losses within the circuit together with a high increase of magnetic components losses, which are related to the DC biasing and consequently components saturation [32][33][34]. Careful attention shall be paid on the magnetic component design, while there are several proposals how to overcome the negative consequences of the interleaved topologies [35][36][37].…”