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Browse Prior Art Database

Method for controlling a modular converter

IP.com Disclosure Number: IPCOM000240993D
Publication Date: 2015-Mar-17

Publishing Venue

The IP.com Prior Art Database

Related People

Beat Ronner: INVENTOR

Abstract

The disclosure pertains to the field of power supplies for electric rail vehicles. It relates to a method for controlling a modular converter in a manner that increases power efficiency, in particular by reducing switching losses of the converter’s semiconductor switches.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 16% of the total text.

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Method for controlling a modular converter

FIELD OF THE DISCLOSURE

  The disclosure pertains to the field of power supplies for electric rail vehicles. It relates to a method for controlling a modular converter in a manner that increases power efficiency, in particular by reducing switching losses of the converter's semiconductor switches.

BACKGROUND OF THE DISCLOSURE

  For electric power supply of electric rail vehicles, e.g. trains or trams, modular converters comprising a plurality of converter cells configured to produce from an AC input voltage a DC output voltage which - for traction applications - may be supplied to a drive unit or motor unit of the electric rail vehicle, but also to electrical installations on-board have recently received growing attention. Usually, the AC input voltage is supplied from a line, in particular an overhead line.

  Exemplary modular converters are, e.g., described in WO 2014/037406 A1, DE 102010044322 A1, and EP 820893 A2, which are hereby included by reference in their entirety. The converters disclosed comprise a plurality of converter cells, connected in series on a primary side or line side of the modular converter, and in parallel on a secondary side or load side of the modular converter. Each converter cell comprises a resonant DC- to-DC converter, which is connected to the line via a primary AC-to-DC converter. In the resonant DC-to-DC converter, a DC-to-AC converter on the primary side is connected via a resonant transformer with a further AC-to-DC converter on the secondary side, in particular a motor side.

  As may be seen from WO 2014/037406 A1, the primary AC-to-DC converter as well as both the DC-to-AC converter and the further AC-to-DC converter may be active converters capable of being operated in either a forward or in a reverse (or backward) direction, and may thus also be referred to as bi-directional converters. This is particularly important for traction applications, and may exemplary be achieved by semiconductor switches, which may be controlled by an appropriate control circuit. To allow for a power flow in the forward direction, i.e. from the primary to the secondary side of the converter cell, the DC-to-DC

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converter of said converter cell is operated in a first active operation state, in which the semiconductor switches of the DC-to-AC converter are pulsed by switching pulses applied by the control circuit. To allow for a power flow in the backward direction, i.e. from the secondary side of the converter cell to the primary side, the DC-to-DC converter of the converter cell is operated in a second active operation state, in which the semiconductor switches of the further AC-to-DC converter are pulsed by switching pulses applied by the control circuit.

  The following publicly available documents form an integral part of the disclosure, and are...