The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 1976
Filed:
Dec. 05, 1974
Adolf Habock, Uttenreuth, DT;
Oskar Beckmann, St. Polten, OE;
Stefan Frese, Vienna, OE;
Herbert Radda, Vienna, OE;
Franz Mayerhofer, Modling, OE;
Karl-Friedrich Leowald, Weiher, DT;
Siemens Aktiengesellschaft, Munich, DT;
Abstract
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.