Powerline carrier control system
AssigneeSiemens Aktiengesellschaft
InventorsHermann Tappeiner, Ernst-Robert Paessler, Kurt Smutny, Karl-Heinz Krugel
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Abstract
A powerline carrier control system having a carrier transmitter which delivers an audio-frequency output voltage, subdivided into transmitted pulses, to a power-line carrier control receiver via a coupling unit and the power distribution network. In order to reduce ringing (after-oscillation) of the coupling unit, an auxiliary decay circuit switches the AC voltage being transmitted into a phase shift or into phase opposition to offset the after-oscillation. In this manner, distortion of the transmitted information is largely avoided.
Claims10
A method for reducing ringing in a coupling network of a powerline carrier control transmitter having a pulsed inverter for generating signals comprising keyed trains of audio output voltage pulses, the ringing occurring after transmission of the last pulse in each signal train, comprising the steps of:
- shifting the output of the transmitter into phase opposition, relative to the phase of the ringing in the coupling network, at the end of the last pulse in each keyed train.
In a powerline control transmitter having a pulsed inverter for transmitting signals comprising keyed trains of audio frequency pulses at a first frequency on a transmission line carrying AC power at a second frequency, the pulsed inverter being coupled to the transmission line via a coupling unit in which a decaying voltage continues to oscillate when keying of a signal is stopped, the improvement comprising:
- means for continuing transmission of each signal train for a short time after keying of the signal train is stopped, and
- means for modifying the signal train transmitted during the short time to offset the decaying voltage in the coupling unit.
Dependencies are inferred from the claim text.