Wide voltage range DC-DC converter

Abstract

According to one aspect of the invention, there is provided an apparatus comprising a two-stage DC-DC converter. The converter consists of a multi-level DC-DC converter stage and a fixed voltage ratio DC-DC converter stage which are connected in series. The converter is controlled such that a first stage of the converter provides an optimized output (regulated bus voltage) as an input to a second stage. The multi-level DC-DC converter may be a first stage, and the voltage conversion ratio is fixed, and the non-regulated DC-DC converter may be a second stage converter. Alternatively, the fixed voltage conversion ratio, non-regulated DC-DC converter may be a first stage, and the multi-level DC-DC converter may be a second stage.

Description

technical field [0001] This application relates generally to the field of power converters, and, in particular, to DC-DC converters. Background technique [0002] Power circuits include AC-DC power converters and DC-DC power converters. DC-DC converters are used in telecom base stations, computing data centers, electric vehicle chargers, and many other types of equipment. High power density, high conversion efficiency and wide input / output voltage range are all ideal characteristics of a DC-DC converter, however, it is not easy to achieve these three characteristics simultaneously in a DC-DC converter. [0003] Single-stage topologies such as LLC converters, phase-shifted full-bridge converters, dual active bridge (DAB converters), etc., are good topological candidates to achieve this combination of characteristics, however, when the input and / or output voltage range is When wide, the efficiency is generally lower. Two stages of DC-DC converters have been used, each with ...

AI Technical Summary

Problems solved by technology

High power density, high conversion efficiency, and wide input / output voltage range are all desirable characteristics of a DC-DC converter, however, in a DC-DC converter, it is not easy to achieve these three characteristics at the same time

[0003] Single-stage topologies such as LLC converters, phase-shifted full-bridge converters, dual active bridge (DAB converters), etc., are good topological candidates to achieve this combination of characteristics, however, when the input and / or output voltage range is Efficiency is usually lower when wide

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