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MUTLI-CONVERTER SYSTEM DESIGN

IP.com Disclosure Number: IPCOM000191267D
Publication Date: 2009-Dec-24
Document File: 5 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

A design for a multi-converter system is disclosed. The proposed design prevents over-heating of a shared capacitor allowing it to air cool as well as reduces circulating currents in the converters. The shared capacitor is raised on C-shaped brackets with extra feet tabs. The extra feet tabs accommodate a converter, preventing stacking of the converters and thereby reducing circulating currents.

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RP13211

MUTLI-CONVERTER SYSTEM DESIGN

BRIEF ABSTRACT

    A design for a multi-converter system is disclosed. The proposed design prevents over-heating of a shared capacitor allowing it to air cool as well as reduces circulating currents in the converters. The shared capacitor is raised on C-shaped brackets with extra feet tabs. The extra feet tabs accommodate a converter, preventing stacking of the converters and thereby reducing circulating currents.

KEYWORDS

    Power electronic converters, DC-link, capacitor, inverter(s), capacitor(s), bus bar(s), multi-converter systems, operation temperature, locomotive(s), resonance, frequency, DC-link capacitor(s), auxiliary converter, natural cooling and air convection.

DETAILED DESCRIPTION

    Power converters are widely used to charge batteries employed in varied environments and applications. Previously, when two types of converters were employed in a system, it was customary to have separate capacitors for the two of converters. However, in next generation multi-converter power electronic systems a single capacitor is used to provide power at different voltage levels and forms.

    These multi-converter power electronic systems typically comprise two power electronic converters, a common DC-link, and a commutating capacitor to

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RP13211

form a complex and extensively interconnected system. Different converters such as DC/DC choppers, DC/AC inverters, and AC/DC rectifiers are used in source, load, and distribution subsystems. Most of the loads are also in the form of power electronic converters and motor drives. The most prevalent examples of these systems are automotive systems and electric or hybrid electric vehicles.

    In electric and hybrid electric vehicles, conventional designs of the multi- converter system are such that the capacitor lies on a floor of the vehicle. And the two converters are stacked one on top of another. Positioning the capacitors on the floor does not allow natural air cooling. Further, stacked converters give rise to excessive currents at frequencies in the range of bus bar resonance frequencies. These excessive currents and lack of natural cooling mechanisms are subject to high operational temperatures and often leads to over-heating.

    One technique conventionally used to prevent over-heating is use of overrated in multi-converter systems. However, use of overrated multi-converter systems is an inefficient solution. Therefore, there is a need in the art for an efficient meth...