Abstract: The invention is directed at an electric power converter, such as an electric motor drive for driving an electric motor. The converter includes a cooling system with a heat sink for dissipating thermal energy generated by the converter and with coolant flow means for cooling the heat sink, first measuring means for measuring the coolant inlet temperature, second measuring means for measuring the heat sink temperature, estimating means for estimating the thermal energy transferred to the heat sink, wherein the converter is provided for estimating the thermal resistance of the heat sink based on the measured temperatures and the estimated thermal energy transferred to the heat sink, for comparing the estimated thermal resistance to reference values and for outputting a signal, if the difference between the estimated thermal resistance and the reference values exceeds a threshold value. The invention is also directed at a method for operating the electric power converter.

Abstract: The present disclosure is directed at an AC drive for driving an electric motor. The AC drive has a 3-phase diode bridge, an inverter and a snubber board with multilayer printed circuit board elements, wherein the power lane in every layer of every element is connected to only one potential DC? or DC+, each element includes two capacitors of inverted polarity, wherein each element includes two C-shaped bus bars and wherein the C-shaped bus bars of two neighbouring elements are placed in close proximity to each other.

Abstract: The invention pertains to a shunt resistor for a current measurement apparatus of a busbar, the resistor having a planar resistor body and two connection terminals for measuring voltage across the planar resistor body, wherein each of the two connection terminals is connected to one of two conductive traces provided on opposite sides of the resistor body, and wherein each of the conductive traces includes a measurement portion and a connection portion for connecting the measurement portion to one of the connection terminals. The invention is also directed at a current measurement apparatus including said shunt resistor and a current path provided in parallel to the shunt resistor. The invention is furthermore directed at a busbar with a corresponding current measurement apparatus, wherein the shunt resistor and the current path are provided for connecting the busbar to an electronic component.

Abstract: An inductor assembly for use in a power converter for transferring power between a DC voltage network and a multiphase AC voltage network. The inductor assembly comprises a core for guiding magnetic flux and coils for generating magnetic flux wherein the core has first legs with differential mode coil wires wound around the first legs and at least one second leg with at least two common mode coil wires wound around said second leg. The winding direction of both AC- and DC-side coils is such that a common-mode electrical current which flows in both coils in the same direction induces in each core leg a magnetic flux which reinforces the total flux circulating in the core.

Abstract: A method and apparatus for the adaptation of a motor drive system is described. The method includes applying a small signal frequency sweep to a motor drive system wherein the motor drive system includes an inverter, an output filter (e.g. a sine filter) and a motor, acquiring frequency response data in response to said frequency sweep and setting parameters of the motor drive system depending on the acquired frequency response data.

Abstract: The present invention relates to a variable speed drive for driving an electric motor and providing a safe torque off (STO) function. The drive includes two parallel signal buffers connected to a safety controller and at least one IGBT gate driver circuit, wherein the signal buffers share the same IGBT gate control signals as inputs and feed them to the same IGBT gate driver circuits and wherein each signal buffer has an own STO control signal for activation and deactivation of outputs. The invention is also directed at a method for diagnosing a corresponding drive.

Abstract: The present invention relates to a drive for an electric application such as an electric motor, said drive including at least one microphone for registering noise signals occurring at the drive, wherein the microphone is connectable to a computing device for analysing the registered noise signals. The registered noise signals may be used for a maintenance process of the drive and/or a fine-tuning process of a drive control method of the drive. The present invention also relates to a maintenance process, in particular a predictive maintenance process for a corresponding drive. Furthermore, the present invention relates to a process for fine tuning a drive control method of a corresponding drive.

Abstract: The invention relates to methods for providing a pulse-width modulated power signal in which control signals are used to define phase states and duration. The invention further relates to a corresponding node and to a corresponding system.

Abstract: An electronic appliance such as a low harmonic drive, an active rectifier, a grid converter or any active front end or grid converter with an LCL filter. The converter is a two-level, a three-level or a multilevel inverter. The electronic appliance includes an LCL filter on a grid side of the electronic appliance and an active front end rectifier provided on a load side of the electronic appliance. The LCL filter includes grid side inductors and an active front end rectifier is connected to the LCL filter. A method for damping a corresponding electronic appliance is also disclosed.

Abstract: A DC-link charging arrangement is described having a DC-link capacitor, rectifier means, and contactor means arranged between supply voltage ports and the rectifier means and having at least one contactor. Such a charging arrangement should enable charging of a DC-link capacitor in a simple way with low losses. To this end a charging capacitor is arranged bridging the at least one contactor.

Abstract: An electric system for transmitting serial communication messages with different priorities over a communication link. The data to be transmitted is arranged in serial communication messages comprising a start of packet (SOP) symbol and data symbols. The ongoing transmission of a first message is interrupted if a SOP symbol of a second message is sent before the first message has been completed. Transmission of the first message is continued only after the second message has been sent.

Abstract: The disclosure provides an inductor and a method for producing the same. The inductor includes a first core made of a first magnetic material; at least two windings, configured to be twisted with each other and embedded within the first core, each winding having a pair of terminals extending out of the first core.

Abstract: A resonance damping element for a power converter having a positive busbar and a negative busbar, wherein the resonance damping element comprises a magnetic core formed with two openings through which the positive busbar and the negative busbar of the power converter are to be routed, respectively.

Abstract: A method for a direct current (DC) power distribution arrangement and a direct current (DC) power distribution arrangement, comprising a plurality of DC power distribution subsystems. Each DC power distribution subsystem comprises an inverter unit (INU) configured to operate as a subsystem-specific circuit breaker for intercoupling/separating the DC power distribution subsystem to/from the rest of the DC power distribution arrangement.

Abstract: A controller (203) comprises a processing system (205) for controlling a power electronic converter during a short circuit taking place in a direct voltage side of the power electronic converter. The processing system recognizes a direction of current in a phase (126-128) of an alternating voltage side of the power electronic converter, sets a high-leg controllable switch (108-110) of the phase to a conductive state while keeping a low-leg controllable switch (111-113) of the phase in a non-conductive state when the recognized direction of the current is outwards from the power electronic converter, and otherwise sets the low-leg controllable switch to the conductive state while keeping the high-leg controllable switch in the non-conductive state. Thermal loadings of freewheeling diodes (114-119) of the power electronic converter are reduced since currents needed to burn input fuses (122) of the power electronic converter are shared between the controllable switches and the freewheeling diodes.

Abstract: A filter arrangement in connection with a power converter for transferring power between a multiphase AC voltage network and a DC voltage network. The filter arrangement comprises a differential mode coil coupled between each AC terminal of an inverter bridge and corresponding AC network phase terminal, and a common mode coil coupled between each inverter bridge DC terminal and corresponding DC network terminal. Both inductors are located in the same magnetic core structure such that each of the differential mode winding is wound around its own phase-specific core leg and all common mode windings are wound around their own single core leg. The winding direction of both AC- and DC-side inductor windings is such that a common-mode current which flows along both inductors in the same direction, induces in each magnetic core leg a flux which reinforces the total flux circulating in the magnetic core.

Abstract: A converter circuitry between a first network, which may be either a poly-phase medium-voltage alternating current (AC) network, at least one polyphase low-voltage AC network or at least one direct-current (DC) network, and a second network, which may be either a polyphase medium-voltage AC network or a medium-voltage DC network, wherein the converter circuitry comprises at least one power bus and low-voltage power cells both at the first and at the second network side such that each power cell is connected to a power bus via a transformer. Each power bus is connected to a low-voltage power unit, which is able to supply pre-charging power via the power bus to all power cell intermediate DC-link filtering capacitors before the converter is started. The low-voltage power unit is also able to take care of a resistor braking in case the first network cannot take the power supplied by the load connected to the second network.

Abstract: An electronic circuit includes: a first series-connection of DC link capacitors (CA1, . . . , CAm) and a second series-connection of DC link capacitors (CB1, . . . , CBn) connected in parallel between DC bus bars (DC+, DC?), wherein the first series has a first node (A) between the DC link capacitors thereof and the second series has a second node (B) between the DC link capacitors thereof; and a short-circuit module (301; 401, 407) configured to receive a voltage difference (UM) between the first node and the second node and to cause the DC bus bars short circuited in response to the received voltage difference being greater than a predetermined threshold.

Abstract: A method for pulse-width modulation of a power converter (10) and a power converter (10) are presented. The method comprises determining (110) a modulation index, selecting (120), based on the modulation index, a modulation technique from a plurality of pre-deter-mined modulation techniques, and modulating (130) an output (16) of the power converter (10) by utilizing the selected modulation technique.

Abstract: A safety circuit coupled between a first direct current (DC) circuit and a second DC circuit, wherein the first DC circuit supplies power to the second DC circuit. The safety circuit comprises a first series connection between positive poles of the first and second DC circuits (the first series connection comprising a first diode, a second diode and a first controllable switch), a second series connection between negative poles of the first and second DC circuits (the second series connection comprising a third diode, a fourth diode and a second controllable switch), a first energy storage device (coupled between the positive pole of the second DC circuit and the first terminal of the second controllable switch), and a second energy storage device (coupled between the negative pole of the second DC circuit and the first terminal of the first controllable switch).