Abstract
Non-isolated step-up voltage converters are commonly required as Battery Discharge Regulators (BDR’s). The Weinberg and boost derived topologies are traditionally employed in modules up to one or two kilowatts. The Interleaved Boost Converter (IBC) is a distributed power processing approach that provides some advantages: reduced power processing (current) per phase, distributed losses (power semiconductors and magnetics), input and output current ripple cancellation, improved dynamic response and better modularity, among others. The IBC converter as BDR has been previously treated and advantages and drawbacks discussed. In this paper a new approach is proposed, a multi-switch, multi-phase interleaved boost converter (named Multi Interleaved Boost Converter, MIBC) that provides inductor and switching frequency decoupling, which in turn affects in different aspects, such as, magnetics, input and output current ripples or part count. This paper presents and describes the MIBC, the potential benefits compared to the IBC and its application as BDR.
Highlights
This paper is meant to be a general description of a PWM interleaved method for DC/DC converters
In the MIBC, the driving signal of each power switch keeps the same switching frequency but the on-time is reduced by a factor m and they are displaced each other in phase over 2pi/m radians
From the point of view of the output current, the 2-4MIBC has the highest RMS value in the whole range, which is a key parameter for output capacitor losses and voltage ripple
Summary
This paper is meant to be a general description of a PWM interleaved method for DC/DC converters. This modulation scheme is aimed to increase converter power density by combining number of modules (phases) in parallel and number of switches per module, please refer to figure 1
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