Abstract: A power electronic device includes an input which is connected to an over-current-protection device arrangement and a DC-link, wherein the DC-link includes a series connection of at least two DC-link capacitors. In such a power electronic device the risk of a fire hazard should be minimized. To this end fault detecting element(s) are provided detecting an imbalance between the DC-link capacitors or an overload of at least one of the DC-link capacitors, wherein the fault detecting element(s) control maximum current inducing element(s) connected to the DC-link.

Abstract: A power electronic device (1) is described comprising an input which is connected to an over-current-protection device arrangement (3) and a DC-link (7, 8), wherein the DC-link (7, 8) comprises a series connection of at least two DC-link capacitors (Cdc). In such a power electronic device the risk of a fire hazard should be minimized. To this end fault detecting means (14) are provided detecting an imbalance between the DC-link capacitors (Cdc) or an overload of at least one of the DC-link capacitors (Cdc), wherein the fault detecting means (14) control maximum current inducing means connected to the DC-link.

Abstract: A cooling system for a power module (or some other power electronics device) is described, the cooling system having a closed flow path for circulating a cooling fluid, the flow path having a pressure that is reduced to below atmospheric pressure. The cooling fluid is circulated along the flow path to provide cooling of the power module. The flow path is delimited from the exterior environment by a space provided between the flow path and the exterior environment, said space being sealed off from the cooling flow path, and said space being sealed off towards the exterior environment. The flow path has a pressure below atmospheric pressure and the space between the flow path and the exterior environment is evacuated and typically has a pressure lower than the pressure in the flow path.

Abstract: The invention concerns a hermetic cooling compressor with an electric motor having a variable speed controlled by a converter cooled by a cooling medium flow. The compressor and the converter are formed together as a unit, in which a medium flowing through the unit is used for cooling of the electronic circuit of the converter. Thus the electronic circuit can be made without bulky cooling plates.

Abstract: A method for controlling the speed of an object which is moveable by a drive and is intended to have reached a predetermined speed after the occurrence of a release signal at a predetermined location. Also a circuit for performing this method including a permanently running drive, an object to be driven, releasable clutch-brake unit between the drive and object and a position sensor. The clutch-brake unit is being brought into clutch or brake engagement depending on a release signal from the position sensor.