Siemens Aktiengesellschaft

Stefan Frese

Franz Mayerhofer

Karl-Friedrich Leowald

Oskar Beckmann

Adolf Habock

Herbert Radda

The invention concerns a firing device for a number of electric valves, particularly thyristors. Each thyristor control path is associated with a firing circuit with a detector for electromagnetic radiation responsive to a transmitter which is controlled by a firing control signal and is equipped with a radiating device which energizes the individual detectors. To transmit the firing control signal with sufficient strength, a transmitter with a radiator is provided which is arranged in the focal line of a reflector designed as a partial elliptical cylinder. The individual detectors are disposed in a line which is aligned essentially parallel to the focal line of the reflector.

Firing apparatus for a plurality of electric valves

A circuit arrangement for the wireless transmission of a control signal to the control path of a semiconductor valve. In particular, the circuit arrangement is provided with a separating filter which is connected to a remote-indication receiver and which is arranged between the high-frequency transmitter and the transmitting antenna of the circuit arrangement. Specifically, the filter includes two directional couplers which are separated by a distance equal to one-eighth of the wavelength of the carrier frequency transmitted by the high frequency transmitter.

Apparatus for the wireless transmission of a control signal to the

The invention concerns a circuit arrangement for the wireless transmission of control signals to the control paths of controlled semiconductor valves, particularly of thyristors, which are preferably usable in a rectifier for high voltage. The control signals are provided for the modulation of a high-frequency transmitter which is disposed at some distance from high frequency receivers each containing a demodulator, whose output signal is delivered to the control path of a semiconductor valve. In order to ensure reliable and interference-proof firing of the semiconductor valves, if the distance between the high-frequency transmitter and the high-frequency receiver is large, there is provided, a frequency-modulated high-frequency transmitter as the high-frequency transmitter. The carrier frequency of the frequency modulated transmitter is in the range of 10 MHz to 50 GHz and has a transmitting antenna provided with a reflector which is directed toward receiving antennas with which the individual high-frequency receivers are equipped. The demodulator contained in each high-frequency receiver comprises a filter which is tuned to the modulation frequency associated with the control signal (p2, p5) which substantially blocks the passage of other frequencies.

Growing community of inventors

Vienna, Austria

Stefan Frese