Apparatus and methods for generating an AC power signal for cable tv distribution systems
US5739595A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cable TV distribution system in which an AC power signal is generated according to the following steps: (a) generating an AC power signal having at least a positive half-cycle, where the positive half-cycle comprises a rising portion, a falling portion, and a central portion; and (b) limiting the slew rate of the AC power signal within the rising portion to a range of 30 V/ms and 50 V/ms inclusive. Preferably, the slew rate of the AC power signal within the falling portion is limited to the range of -30 V/ms and -50 V/ms inclusive. The AC power signal is preferably generated by a power supply comprising: (a) a ferroresonant transformer; (b) a ferro-capacitor connected across the first and second terminals of the output windings of the ferroresonant transformer; (c) an inductor connected across the first and second terminals in parallel with the ferro-capacitor; (d) a switch for preventing current flow through the inductor in response to a switch control signal; and (e) a control circuit for generating the switch control signal to obtain the desired AC power signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.