Abstract: A method for refrigerant charge determination in a cooling circuit including a low-pressure section and a high-pressure section. At least one compressor unit generates a compression flow of refrigerant from said low-pressure section to said high-pressure section. At least one expansion device generates an expansion flow of refrigerant from said high-pressure section to said low-pressure section. A heat-releasing heat exchanger in said high-pressure section cools and condenses compressed refrigerant. A heat-absorbing heat exchanger in said low-pressure section vaporizes said expanded refrigerant. The method includes loading refrigerant from said low-pressure section into said high-pressure section. An unloading step admits the expansion flow of refrigerant loaded in said high-pressure section into said low pressure section and determines the amount of refrigerant flowing in said unloading step.

Abstract: The invention refers to a heat transfer assembly for cooling an electronic power circuitry, said heat transfer assembly comprising a base member and at least one electronic power component in heat conductive contact for transferring heat to said base member, a heat transfer chamber adjoining said base member and being provided with fins extending from said base member into said heat transfer chamber for transferring heat to a flow of cooling medium extending through said heat transfer chamber and passing through spaces between said fins, said heat transfer assembly is designed such that said flow of cooling medium comprising an environment induced flow extending through said heat transfer chamber and entering said heat transfer chamber with respect to the direction of gravity in a lower section thereof and exiting from said heat transfer chamber with respect to said direction of gravity from an upper section thereof.

Abstract: Method for refrigerant charge determination in a cooling circuit, said cooling circuit comprising a low pressure section and a high pressure section, at least one compressor unit for generating compression flow of refrigerant from said low pressure section to said high pressure section by compressing said refrigerant, at least one expansion device for generating an expansion flow of refrigerant from said high pressure section to said low pressure section by expanding refrigerant present in said high pressure section, a heat releasing heat exchanger in said high pressure section for cooling, in particular condensing, compressed refrigerant, a heat absorbing heat exchanger in said low pressure section for vaporizing said expanded refrigerant, said method comprising the following steps a loading step comprising loading essentially all refrigerant from said low pressure section into said high pressure section by reducing said expansion flow, in particular with the expansion flow being terminated, an unloading ste

Abstract: A safety circuit for temperature tripping with redundancy is disclosed. The safety circuit comprises a first temperature evaluation module comprising a first input arranged to receive a first input signal derived from a temperature by means of a temperature-dependent element; the first temperature evaluation module further comprising a first output arranged to provide a first output signal corresponding to said determined first temperature state. The safety circuit further comprises a second temperature evaluation module comprising a second input arranged to receive a second input signal derived from said temperature by means of said temperature-dependent element, the second input signal being different from said first input signal; the second temperature evaluation module further comprising a second output arranged to provide a second output signal corresponding to said determined second temperature state.