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Abb Research Ltd.

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Hitachi Energy Ltd

Hitachi Energy Switzerland Ag

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Abb E-mobility B.v.

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Francisco Canales

Uwe Drofenik

Thomas Gradinger

Zhenyuan Wang

Johann Kolar

Rolando Burgos

Tero Viitanen

Antonio Coccia

Ki-Bum Park

Sami Pettersson

Sara Ahmed

Ngai-Man Ho

Franziska Brem

Leonardo-Augusto Serpa

Drazen Dujic

Eddy C Aeloiza

Mario Schweizer

XiaoBo Yang

Georgios Papafotiou

Oscar Apeldoorn

Toufann Chaudhuri

Gerardo Escobar

Stephane Isler

Philippe Stefanutti

Kuenfaat Yuen

Manfred Winkelnkemper

Frederick Kieferndorf

Chunlei Liu

Gerold Knapp

Dawei Yao

Beat Guggisberg

Bernhard Wunsch

Juergen Steinke

Guoxing Fan

Nicolas Hugo

Daniel Aggeler

Mikko Paakkinen

Marcel Merk

Thiago-Batista Soeiro

Akos Mester

Marc Pellerin

Fabiana Da Silveira Cavalcante

Gabriel Ignacio Ortiz

Roman Bosshard

Daniel Rothmund

Guanghai Gong

River-TinHo Li

Johann Walter Kolar

Thomas Bernhard Gradinger

Batista Thiago Soeiro

Lukas Schrittwieser

Tin Ho Li

A charging station for electric vehicles includes a central part for converting a grid AC voltage from an electrical grid into a high frequency AC voltage; a distribution network for distributing the high frequency AC voltage; and a plurality of coils directly connected to the distribution network, wherein each coil is adapted for transferring energy to an electrical vehicle.

Charging station with high frequency distribution network

A DC/DC converter which includes a first DC link, the first DC link can be a first DC link capacitor; a first plurality of N>1 converter bridges connected in parallel to the first DC link; and a transformer, the transformer can be a medium frequency transformer. The transformer includes a primary side and a secondary side, the primary side including at least one primary winding. The converter further includes a first plurality of N impedance elements, for each converter bridge, a respective impedance element of the first plurality of impedance elements is connected between the converter bridge and the at least one primary winding.

Current balancing in power semiconductors of a DC/DC converter

A dual active bridge DC/DC converter in accordance with the invention comprises a first DC link, preferably comprising a first DC link capacitor; a converter bridge connected to the first DC link; a transformer, preferably a medium frequency transformer, having a primary side and a secondary side; the primary side of the transformer comprising a plurality of M>1 primary windings, each of the plurality of primary windings having a first and a second terminal; wherein the dual active bridge DC/DC converter further comprises a first plurality of M energy transfer inductors; and wherein for each of the M primary windings, a different one from the first plurality of energy transfer inductors is connected between said primary winding bridge and the converter bridge.

Dual active bridge converter cell with split energy transfer inductor for optimized current balancing in the medium frequency transformer (MFT)

A multi-pulse line-interphase transformer converter includes an electric part that includes magnetic components configured to be connected to a three-phase AC grid, and an electric part that includes a multi-phase voltage system configured to be connected to a common DC capacitor. The electric part splits each AC grid phase n times into two phases, resulting in a plurality of intermediate phases at an internal interface, each intermediate phase corresponding to a pulse of the multi-pulse line-interphase transformer converter. The intermediate phases are connected to the multi-phase voltage system. The multi-phase voltage system comprises bridges with actively controlled switches. The bridges are connected in parallel to the common DC capacitor.

Bi-directional line-interphase transformer-based converter

An electrical interconnection circuit can be used with a solid-state-transformer (SST) system. The interconnection circuit includes medium voltage direct current (MVDC) to low voltage direct current (LVDC) direct current to direct current (DC/DC) converters, independent LVDC buses respectively connected to one of the MVDC to LVDC DC/DC converters, and an interconnecting DC/DC converter connecting at least two of the independent LVDC buses in order to ensure equal power demand from each MVDC to LVDC DC/DC converters. The interconnecting DC/DC converter is configured to re-route power between the plurality of independent LVDC buses. A power rating of the interconnecting DC/DC converter is set according to power to be rerouted from other LVDC buses via the interconnecting DC/DC converter.

SST system with multiple LVDC outputs

A protection circuit for a power converter with cascaded bipolar and/or unipolar semiconductors is provided. The protection circuit includes at least one comparator circuit which is adapted to monitor a voltage characteristic on a collector-emitter path of at least one semiconductor which is arranged in a polarity selection stage of the power converter and/or to monitor a voltage characteristic on at least one capacitor, which is arranged in the power converter. The at least one comparator circuit is further adapted to output an electrical signal, representing the voltage characteristic of the semiconductor and/or the at least one capacitor to at least one evaluation unit. The at least one evaluation unit is further adapted to evaluate the result from the at least one comparator circuit and to deactivate the semiconductors in case that the voltage characteristic of the semiconductors and/or the capacitors deviate from a predetermined threshold.

Protection scheme for power converters utilizing cascaded bipolar and unipolar power semiconductor devices

Transformer assembly including a first transformer stage having a plurality of first-stage transformer cells; and a second transformer stage. An input of the second transformer stage is connected to an output of the first transformer stage. A lightning impulse breakdown voltage of a transformer cell of the second stage is at least double of a lightning impulse breakdown voltage of transformer cells of the first stage.

Transformer assembly with medium frequency transformers

A power module included a plurality of normally-on semiconductor switches based on a wide bandgap substrate, the normally-on semiconductor switches connected in parallel; and a balancing unit including a capacitor and a balancing semiconductor switch connected in series, which are connected in parallel to the normally-on semiconductor switches.

Power module based on normally-on semiconductor switches

A converter cell for a modular converter includes at least one power semiconductor switch for switching a cell current through the converter cell; a cell capacitor interconnected with the at least one power semiconductor switch, such that the cell capacitor is loadable by the cell current; a controller for switching the at least one power semiconductor switch, wherein the controller is supplyable with auxiliary power from the cell capacitor; and a photovoltaic cell for providing initial and/or further auxiliary power to the controller.

Converter cell with integrated photovoltaic cell

The invention relates to a bidirectional DC-DC converter with intermediate conversion into AC power, including: a DC-AC conversion circuit using a plurality of MOSFETs; an AC-DC conversion circuit using a plurality of power diodes; a transformer; a pair of switches, one of which being inserted in series between a DC terminal of the DC-AC conversion circuit and the AC-DC conversion circuit and the other of which being inserted in series between another DC terminal of the DC-AC conversion circuit and the AC-DC conversion circuit; and a controller being adapted for turning on the pair of switches such that the plurality of power diodes of the AC-DC conversion circuit are reverse-biased where the AC power is transferred in the forward direction and turning off the pair of switches where the AC power is transferred in the backward direction.

Bidirectional DC-DC converter and control method therefor

A converter system for interconnecting renewable energy sources with a DC distribution bus comprises a converter unit which comprises an isolated DC-to-DC converter connectable to the renewable energy source, and a non-isolated DC-to-DC converter connectable to the DC distribution bus, which is cascade connected with the isolated DC-to-DC converter.

Power converter system for renewable energy sources

The present invention is concerned with a four-level voltage source converter topology including two intermediate converter branches connecting two intermediate voltage levels to a load terminal, and including a interconnect switch coupling the two intermediate branches. The interconnect switch replaces two controlled switches present in corresponding four-level prior art topologies. The four-level converter thus requires, for a full bidirectional implementation, only five active switches. The reduced number of active switches/gate drivers and the four available output voltage levels make this solution interesting for lower cost power electronics with improved reliability, good power quality and minimized filtering requirement.

Four-level power converter

An uninterruptible power supply system includes an AC input interface and a DC output interface, and a plurality of power supply paths coupled between the AC and DC interfaces. A first one of the power supply paths has a lower component count, whereas a second one of the power supply paths has a higher component count. At least one of the power supply paths is structured to supply DC electrical power to a power bus in the DC output interface at a varying voltage.

Electrically powered computer system and power supply system for same

An exemplary inductive power transfer system having a transmitter coil and a receiver coil. A transmitter-side power converter having a mains rectifier stage powering a transmitter-side dc-bus and controlling a transmitter-side dc-bus voltage U. A transmitter-side inverter stage with a switching frequency fsupplies the transmitter coil with an alternating current. A receiver-side power converter having a receiver-side rectifier stage that rectifies a voltage induced in the receiver coil and powering a receiver-side dc-bus and a receiver-side charging converter controlling a receiver-side dc-bus voltage U. Power controllers that determine from a power transfer efficiency of the power transfer, reference values U*, U* for the transmitter and receiver side dc-bus voltages. An inverter stage switching controller controls the switching frequency fto reduce losses in the transmitter-side inverter stage.

Inductive power transfer system and method for operating an inductive power transfer system

A power supply system includes an AC input interface, a DC output interface, and each of a single-conversion power supply path and a multi-conversion power supply path extending between the AC input interface and the DC output interface. Operating the system in a first or standard mode includes conveying electrical power between an AC power supply and an electrical load by way of the single-conversion power supply path. Operation in a second or non-standard operation mode includes conveying the electrical power by way of the multi-conversion power supply path.

Power supply and distribution systems and operating strategy

Growing community of inventors

Baden-Dättwil, Switzerland

Francisco Canales