Abstract: A high power system includes a common DC-bus supply with bus connections, a DC link capacitor bridging the two bus connections and at least two inverter modules connected to the DC-bus supply via the bus connections. Each inverter module includes at least one inverter cell with at least one free-wheeling diode (FWD). The inverter cells are connected to the bus connections via inverter cell connections. A protection diode arrangement is provided antiparallel to the DC link capacitor.

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: Power electronics device, such as a frequency converter, comprising power units (REC1, INU1, INU2, CDC1), a metal frame (31) and a DC bus arrangement in which the power units are connected. The power units may be assembled inside the metal frame (31) wherein the shape of the metal frame is elongated with rectangular cross-sectional shape, consisting of a bottom part (33) and from that essentially vertical oriented side wall parts (32). The DC bus arrangement is arranged on top of the bottom part (33) of the metal frame (31) and separated by an insulator layer (S1) from the metal frame (31). The DC bus arrangement comprises a first DC bus current conductor (DC+) and a second DC bus current conductor (DC?) which are arranged apart from each other. The DC bus current conductors (DC+, DC?) have a flat shape in such a way that their thickness dimension is essentially shorter than their width dimension.

Abstract: Power electronics device, such as a frequency converter, comprising power units (REC1, INU1, INU2, CDC1), a metal frame (31) and a DC bus arrangement in which the power units are connected. The power units may be assembled inside the metal frame (31) wherein the shape of the metal frame is elongated with rectangular cross-sectional shape, consisting of a bottom part (33) and from that essentially vertical oriented side wall parts (32). The DC bus arrangement is arranged on top of the bottom part (33) of the metal frame (31) and separated by an insulator layer (S1) from the metal frame (31). The DC bus arrangement comprises a first DC bus current conductor (DC+) and a second DC bus current conductor (DC?) which are arranged apart from each other. The DC bus current conductors (DC+, DC?) have a flat shape in such a way that their thickness dimension is essentially shorter than their width dimension.

Abstract: Power electronics device, such as a frequency converter, which includes liquid-cooled power units (REC5, REC6, AFE5, AFE6, INU4, INU5, DC/DC, DC/AC) and also a substrate arrangement. The power units include at least one power semiconductor component, e.g. an IGBT or a diode, connected to at least one power circuit connecting them. The power units are mechanically separate and they are disposed on at least one substrate provided with liquid cooling ducts. The substrate is common to more than one power unit, wherein the substrate includes liquid cooling interfaces and power circuit interfaces for each power unit that can be connected to it. In addition, the substrate includes one liquid cooling interface and one power circuit interface (DC+, DC?) to outside the substrate.

Abstract: Power electronics device, such as a frequency converter, which includes liquid-cooled power units (REC5, REC6, AFE5, AFE6, INU4, INU5, DC/DC, DC/AC) and also a substrate arrangement. The power units include at least one power semiconductor component, e.g. an IGBT or a diode, connected to at least one power circuit connecting them. The power units are mechanically separate and they are disposed on at least one substrate provided with liquid cooling ducts. The substrate is common to more than one power unit, wherein the substrate includes liquid cooling interfaces and power circuit interfaces for each power unit that can be connected to it. In addition, the substrate includes one liquid cooling interface and one power circuit interface (DC+, DC?) to outside the substrate.

Abstract: The shape of the rising and falling edges of AC output voltage pulses of a PWM frequency converter is controlled by reducing a speed of change, and a height, of the AC output voltage pulse. The PWM frequency converter rectifies the alternating voltage of a supply network into a DC voltage which is filtered. A load bridge having power semiconductor phase switches forms an AC output voltage from the DC voltage for controlling the load. An average speed of voltage change of AC output voltage pulses is set using a phase switch to control at least one power component to be conductive and non-conductive in turn for a period of at least about one microsecond to change a pulse edge of the AC output voltage pulses into at least one micropulse, the width of which is controlled to increase towards a final state of the phase switch.

Abstract: Method and arrangement for controlling the output voltage pulses of a PWM frequency converter, in which PWM frequency converter is a network bridge (10) for rectifying the alternating voltage of the supply network into the DC voltage (UDC) of the DC intermediate circuit, which is filtered with a filtering capacitor (CDC), a load bridge (11) comprised of phase switches implemented with power semiconductor components, which forms the AC output voltage (U, V, W) from the DC voltage of the intermediate circuit for controlling the load (M), in which for setting the average speed of change in the output voltage in connection with each change of state of the output voltage at least one power component controlled by a phase switch is controlled such that before the output voltage remains in its position subsequent to the change of state it is on at least once for a short period, typically of less than 1 ?s (a micropulse), in the position prevailing before the change of state.