Siemens Aktiengesellschaft

Bernafon Ag

Carsten Braun

Remo Vaterlaus

Uwe Blessing

Christian Glück

Harald Strohmaier

Ronald Stempel

Joerg Braune

A switched-mode power supply has a rectifier device, a switching unit which is arranged downstream of the rectifier device, a transmission device which is arranged downstream of the switching unit and a filter device. In order to reduce the sensitivity of the switched-mode power supply to high-energy interferences, it is proposed that the filter device contains a current-compensated choke coil which is connected to a voltage limiter circuit in such a way that in the case of interference signals applied to the choke coil, a damping of the interference signals takes place by way of the voltage limiter circuit.

Switched-mode power supply with voltage limitation

The application relates to a configurable hearing device such as a hearing aid comprising an input transducer adapted to transform an input sound signal to an electrical input signal; a memory storing at least two different performance categories, each comprising a group of technical features, the group of technical features of each of the at least two different performance categories being at least partially overlapping and each technical feature of the group of technical features being defined by a selectable range and/or parameter settings; a signal processing unit adapted to access the memory and to process the electrical input signal in accordance with an active performance category selectable from the at least two different performance categories, the signal processing unit providing a processed electrical signal; and an output transducer adapted to transform the processed electrical signal to an output signal producing a hearing perception to a user of the hearing device. The invention may e.g. be used for the fitting of hearing aids to first time users, where a choice between different hearing aid models having different performance must be made.

Configurable hearing system

A drive circuit for an electromagnetic relay having a relay coil and switch contacts, includes a first switching device between a first coil terminal and a first voltage source, a second switching device between a second coil terminal and a zero potential, and a control device producing a current through the coil closing both switching devices. To provide the shortest possible response time and simple and cost-effective construction, a second voltage source is connected through a third switching device to the first coil terminal. The third switching device is connected in parallel with the first switching device, the second voltage source has a higher voltage level than the first voltage source and the control device produces a current through the coil, initially closing all three switching devices and following expiration of a predefined period, opening the third switching device again and keep the first and second switching devices closed.

Drive circuit for an electromagnetic relay

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Berlin, Germany

Carsten Braun