Siemens Aktiengesellschaft

Volkswagen Ag

Udo Hallmann

Martin Hans

Mark Beckmann

Michael Eckert

Andreas Otte

Jean-Paul Kremer

Vadym Bulakhov

Semiconductor modules are used for controlling drive motors such as the electric motors of electric vehicles. IGBT modules are one type of such semiconductor modules. During operation, heat losses arise in the power transistors and the diodes of the semiconductor modules, which causes an increase in their temperature. Therefore, the manufacturers of the IGBT modules recommend that the software of a control unit that controls an IGBT module be provided with a protective function which continuously monitors the temperature of the IGBT module and intervenes as necessary if an unacceptable temperature of a component of the IGBT module is reached. A temperature model is used for the calculation. The manufacturers provide a more accurate higher-order temperature model that however causes an increased amount of computation. According to the proposal, a reduced temperature model is used that is calculated using the balanced truncation method and is optimized for certain working ranges.

Method and device for estimating the temperature of a semiconductor element, and computer program

A method, apparatus and computer program for multiplexing a number of second channels, in particular logical channels, in accordance with the UMTS protocol architecture for the air interface, onto a first channel, in particular a transport channel, in accordance with the UMTS protocol architecture for the air interface, in a transmission apparatus and/or for demultiplexing in the opposite direction in a receiving apparatus, with the channels that are involved being configured by means of at least one configuration command, in particular with regard to the size of the data units to be transported by them. In the configuration, at least one size of data units is in each case supported by only a single second channel, in order to allow data units of this size to be allocated to the relevant second channel.

Method, apparatus and computer programs for multiplexing and/or demultiplexing

Data packets are transmitted via a radio interface, wherein a control unit of a first entity transmits information via its logical channels serving as service access points in the form of a configuration message, with the configuration message including information about which logical channels are to be mapped onto which transport channels serving as service access points for a bit transmission layer. A set of transport formats are predetermined for each of the transport channels along with a set of permitted combinations of transport formats for all transport channels. Each transport format includes a set of parameters determining transmission characteristics of the transport channel configured with the corresponding transport format. The first entity selects a transport format for each of the transport channels, such that the resulting combination of transport formats corresponds to one of the transport combinations defined as permissible and wherein the first entity transmits the data to initiate the transmission of the data packets.

Method for transmitting data packets via a radio interface of a mobile radio system

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Lahstedt, Germany

Udo Hallmann