Abstract: A DC-to-DC power converter includes at least two energy buffers. Each energy buffer unit is configured to receive a first-type voltage component and to respectively produce a voltage at an output of the DC-to-DC power converter, and the DC-to-DC power converter also includes at least one energy exchanger. The at least one energy exchanger is connected to the at least two energy buffers and is configured to exchange energy between the at least two energy buffers.

Abstract: A balancer circuit for a series connection of two direct current (DC)-link capacitors comprises a first and second terminal for being connected to a first and second terminal of the series connection of the capacitors, respectively; and a third terminal for being connected to a node between the capacitors. The balancer circuit comprises a first and second inductor and a capacitor arrangement connected in series between the first and second terminal of the balancer circuit. The capacitor arrangement is connected between the first and second inductor. The balancer circuit comprises a first switch arrangement connected between the third terminal and a node between the first inductor and the capacitor arrangement; and a second switch arrangement connected between the third terminal and a node between the second inductor and the capacitor arrangement. The first and second switch arrangement each comprises a semiconductor switch or two semiconductor switches connected in series.

Abstract: A power conversion system includes one or more solid state transformers, and a medium voltage DC-AC inverter. Each solid state transformer includes a primary stage, including at least one DC-AC converter, each arranged to receive low voltage DC power from a power generation unit, and one or more primary medium frequency transformer windings, and a secondary stage, including at least one AC-DC rectifier, each arranged to receive AC power from a respective secondary medium frequency transformer winding. The medium voltage DC-AC inverter is configured to receive medium voltage DC power from one or more rectifiers and output medium voltage AC power.

Abstract: A power conversion system includes a first direct current to alternating current (DC-AC) inverter, a second DC-AC inverter, an inverter controller, a direct current (DC)-link circuit connecting the first DC-AC inverter and the second DC-AC inverter, a neutral-point balancer (NPB), an NPB circuit, and an NPB controller. The inverter controller is configured to provide a pulse-width modulation (PWM), signal to the first DC-AC inverter and the second DC-AC inverter. The NPB circuit is configured to reduce low frequency current oscillations in the DC-link circuit by switching between a first state for transferring charge from a positive voltage line to a neutral voltage line, and a second state for transferring charge from the neutral voltage line to a negative voltage line. The NPB controller is configured to control the switching of the NPB circuit and is synchronized with the PWM signal from the inverter controller.

Abstract: An example DC-DC converter arrangement for interconnecting a photo-voltaic panel to a battery for an electric vehicle includes: a first terminal for connecting the DC-DC converter arrangement to the photo-voltaic panel, the first terminal being configured to provide a first DC voltage; a second terminal for connecting the DC-DC converter arrangement to the battery, the second terminal being configured to provide a second DC voltage; a first DC-DC converter stage configured to convert the first DC voltage into an intermediate DC voltage; and a second DC-DC converter stage configured to convert the first DC voltage and the intermediate DC voltage into the second DC voltage for loading the battery with a full power provided by the photo-voltaic panel, where the second DC-DC converter stage is configured to galvanically isolate the second DC voltage from the first DC voltage and the intermediate DC voltage.

Abstract: A converter comprises a first circuit part and a second circuit part configured to be electrically connected with each other. Each circuit part comprises two or more switches configured to be switched for the power conversion, the switches being semiconductor switches. The two or more switches of the first circuit part are configured for a first switching operation of the first circuit part. The two or more switches of the second circuit part are configured for a second switching operation of the second circuit part. The first switching operation causes a greater electrical power loss compared to the second switching operation. The two circuit parts are configured such that the first circuit part is configured to operate at a higher operating temperature compared to the second circuit part.

Abstract: A power converter may include: a first terminal, a second terminal and a third terminal, and an AC terminal for coupling an AC voltage; a first controllable unidirectional switching circuit; a second controllable unidirectional switching circuit; a controllable bidirectional switching circuit; a first diode connected in a forward current direction between the third terminal and the first controllable unidirectional switching circuit; and a second diode connected in a forward current direction between the second controllable unidirectional switching circuit and the third terminal.

Abstract: The technology of this application relates to a partial power converter that is configured to be connected to at least one photovoltaic panel as inputs and a direct current output bus, the at least one photovoltaic panel generating a direct current. The partial power converter includes a photovoltaic-side converter comprising at least two switching cells, a bus-side converter comprising at least two switching cells, the bus-side converter being configured to switch a total current of the photovoltaic-side converter, an energy storage element connected between the photovoltaic-side converter and the bus-side converter, and an indirect voltage source configured to regulate the energy storage element. The photovoltaic-side converter, the bus-side converter and the energy storage element are connected in parallel between the first node and the second node of the partial power converter.

Abstract: A matrix power converter includes an AC input port arranged to receive three phase power. The AC input port is connected to an input filter arranged to filter switching harmonics of the three phases of the received AC power. The input filter is connected to a 3-to-2 phase matrix converter arranged to convert the three phases of the received AC power to a two phases of AC power. The 3-to-2 phase converter is connected to a primary side of a load transformer arranged to receive the two phases of the AC power. A secondary side of the load transformer is connected to an AC-to-DC converter. The matrix power converter is characterized in that the 3-to-2 phase converter includes a nested directional switch including three power switch cell groups, one for each phase of the received AC input power.

Abstract: A method for generating a set of pulse-width modulation control signals for a multi-level power converter. The method includes generating a base reference signal for each of three or more reference phases and determining a maximum reference and minimum reference. The method includes calculating a reference sum of the maximum reference and the minimum reference and generating a first offset and a second offset based on the reference sum. The method includes for each of the three reference phases generating an upper PWM output and a lower PWM output. The method includes combining the upper PWM output and lower PWM output to generate a multi-level PWM control signal for the reference phase and outputting a set of multi-level PWM control signals generated for the three or more reference phases.

Abstract: A power electronics multilevel converter comprises one or more phase legs. Each respective phase leg of the one or more phase legs comprises a plurality of cells. Each respective cell of the plurality of cells comprises an alternating current (AC)/direct current (DC) converter, a closed-loop control and a DC/DC converter. The closed-loop control is configured to regulate the cell power transmitted by the AC/DC converter to a DC link of the respective cell in accordance with a cell power reference. The cell power reference depends on a cell voltage reference. The closed-loop control is further configured to adjust the cell voltage reference in dependence of a cell power reference deviation from an average power per cell. The average power per cell depends on the cell power references of the plurality of cells of all phase legs.

Abstract: The present disclosure relates to a method for operating a converter. The converter comprises a first and second input terminal for receiving a DC voltage, an output terminal for providing an output voltage variable between a first voltage level and a second voltage level, a first and second series connection of two or more switches that are semiconductor switches, and one or more capacitor units. The method comprises the following operation: compensating different power losses of the switches by controlling the switches such that one or more of the one or more capacitor units are charged above a respective third voltage level, and/or that one or more of the one or more capacitor units are charged below a respective third voltage level, so that the DC voltage is not equally distributed to the switches.

Abstract: The technology of this application relates to an arrangement for electric power conversion and dual electric drive, a system comprising the arrangement, a method of operating the arrangement, and a computer program for carrying out the method, which enable charging of dual-drive electric vehicles (EV) from a three-phase power grid without producing any torque, while making use of all the power electronics already existing for the traction system and the motor inductances. As such, space is saved and power density, efficiency and reliability are increased.

Abstract: The disclosure relates to a switch arrangement for a converter, comprises: a first series connection of at least two switches between two terminals of the switch arrangement, wherein the two switches are semiconductor switches; a second series connection of a first capacitor and a first diode circuit electrically connected in parallel to first part of the first series connection between a first terminal of the two terminals and node between the two switches, wherein the first diode circuit comprises at least one diode; and third series connection of a second capacitor and a second diode circuit electrically connected in parallel to a second part of the first series connection between second terminal of the two terminals and the node between the two switches, wherein the second diode circuit comprises at least one diode. Further a method for switching such a switch arrangement between the conducting state and the non-conducting state.

Abstract: An arrangement for electric power conversion and an electric drive comprises a power converter that includes three legs, an electric motor including three open-end stator windings respectively having first and second ends, and a power switch. The first ends of the stator windings are coupled to respective legs of the three legs of the power converter, and the second ends of the stator windings are coupled together and have a same electric potential. The power switch is configured to selectively disconnect one of the second ends of the stator windings from all other second ends to establish at most two distinct electric potentials. The at most two distinct electric potentials are coupled to respective legs of a power grid interface coupled to the arrangement.

Abstract: A DC/DC power converter converts voltage at an input of the DC/DC power converter to a voltage at an output of the DC/DC power converter, where the output voltage is a multiple of the input voltage. The DC/DC power converter comprises two switching circuits electrically connected in series, two capacitors electrically connected in series, and a resonant circuit comprising a resonant capacitor and a resonant inductor. The series connection of the two capacitors is electrically connected in parallel to the series connection of the two switching circuits. The resonant circuit is electrically connected to the two switching circuits. A first capacitor of the two capacitors is electrically connected in parallel to the input. Each switching circuit comprises two switching units electrically connected in series, wherein each switching unit comprises two or more switches electrically connected in series.

Abstract: A DC/DC power converter for converting voltage at an input to a voltage at an output of the DC/DC power converter is provided, wherein the output voltage is a multiple of the input voltage. The DC/DC power converter comprises two switching circuits electrically connected in series, two capacitor units electrically connected in series, and a resonant circuit comprising a resonant capacitor and a resonant inductor. A first switching circuit of the two switching circuits is electrically connected to one side of the first capacitor unit opposite to the other side of the first capacitor unit connected to the second capacitor unit of the two capacitor units. The switches of the first switching circuit are controllable semiconductor switches. The first switching circuit comprises one or more diode units electrically connecting the first capacitor unit to the two switching units of the first switching circuit.

Abstract: An AC/DC converter stage for a converter system with an input series structure. The AC/DC converter stage includes two input terminals for inputting an AC input voltage and at least a first circuit branch with at least two switches that are electrically connected in series at a first connection point, where a first input terminal of the two input terminals is electrically connected to the first connection point of the first circuit branch. At least one first electrical storage provides a DC output voltage and is electrically connected in parallel to the first circuit branch. At least one controllable bidirectional switch is electrically connected between the two input terminals.

Abstract: The present invention relates to a DC-to-DC power converter (100), comprising at least two energy buffer units (102, 104), wherein each energy buffer unit (102, 104) is configured to receive a first-type voltage component and to respectively produce a voltage Vb at an output of the DC-to-DC power converter (100), and at least one energy exchanger (106), wherein the at least one energy exchanger (106) is connected to the at least two energy buffer units (102, 104) and is configured to exchange energy between the at least two energy buffer units (102, 104).

Abstract: The invention relates to a supply system for a plurality of loads connected in parallel to a direct current supply bus. The supply system includes a DC supply bus and a plurality of supply lines connected in parallel to the supply bus and supplying the said loads. The supply system includes uncoupling and damping means that is adapted to decrease the unipolar signals travelling within the supply system while the loads are being supplied. The uncoupling and damping means includes at least one inductance arranged in series in at least one of the supply lines. Protective means (are also provided for protection in the event of a fault.