Current level control for TWACS inbound communications
US5933072A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1997 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Nov 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of controlling the current level of an inbound signal (Si) used in a TWACS (two-way communication system) for an electrical distribution system. The inbound signal conveys operational information and data on the performance of the system. The method includes first measuring the current (I) of the inbound signal. This current measurement is performed for each of a predetermined number of successive inbound signals. The root mean square (RMS) value of the measured currents is then determined. Operation of a solid state device (SCR) used to generate the inbound signal is now controlled as a function of the root mean square value. A line current propagating through the electrical distribution system is now modulated with the inbound signal. The inbound signal occurs at a predetermined range of angles (X) within a line voltage cycle regardless of variations in the line voltage characteristics. This enables the inbound signal to be readily detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.