Apparatus for transmitting information on an alternating current line
US4398178A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1980 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Apr 3, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S10/52
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a system for transmitting information on an a.c. line from a transmitter unit to a receiver unit which is connected to the line at a great distance from the a.c. source supplying said line than the transmitter unit, information is transmitted on one of the phase conductors of the line in a form of a series of short-duration pulse-like amplitude reductions in the alternating voltage waveform on said phase conductor during one and the same half cycle of the waveform, whereat the pulses are mutually arranged in the pulse series to form a binary code word representing the desired information. The short-duration pulse-like amplitude reductions in the alternating voltage waveform are generated by means of a current transformer (14), whose primary winding is connected in series with the phase conductor (4) and whose secondary winding is short circuited by means of a switching transistor (15) controlled by a control unit (6) to be opened for a short duration for each desired pulse in the series of information pulses. When the transistor (15) is opened, a voltage regulator (17) connected across the secondary winding of the transformer restricts the change in magnetic flux in the transfor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.