Apparatus and methods for generating an AC power signal for cable TV distribution systems
US5410720A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1992 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | Oct 28, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/78
- 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) circuit that generates a first drive signal having a first portion comprising a series of pulses, a second portion comprising a series of pulses, and a third portion comprising a single pulse; (b) a drive circuit that generates a pulsed power signal the timing of which corresponds to the timing of the first drive signal; (c) a transformer; and (d) an output capacitor for integrating the output of the drive circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.