Signal transmission circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 30, 2003
Grant Date -
N/A
app pub date -
Apr 28, 2000
filing date -
Apr 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present circuit serves for the transmission of information signals over the general electricity supply mains. It has a transducer (13) for the galvanic separation of the mains voltage. The mains side winding (L1) of the transducer is connected in series with a capacitor (C1) in order to separate the mains frequency from the frequency of the information signal. It is loosely coupled with the windings (L2, L3) of the transducer, being galvanically separated from the mains with a coupling degree between 0.8 and 0.98, whereby the transducer obtains a desired mains side stray inductance. The circuit is dimensioned so that it has a low impedance at the mains, when it is sending, and a high impedance, when it is receiving, that it provides a high level of the reception signal at the application side terminal and that it has a broadband balanced frequency response, which is largely independent of fluctuations of the mains impedance within a broad frequency range.
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