Circuit arrangement for the wireless transmission of control sig

Details Circuit arrangement for the wireless transmission of control sig Circuit arrangement for the wireless transmission of control sig

1974-12-05

1976-03-23

Pitts, Harold I.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343228, H03K 1700

Patent

active

039463893

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.

REFERENCES:
patent: 3643260 (1972-02-01), Clarke
patent: 3742440 (1973-06-01), Ehrlich

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