The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1982
Filed:
Dec. 10, 1980
Charles S Turner, Dallas, TX (US);
Donald J McNeal, Garland, TX (US);
Donald G Cheshier, Garland, TX (US);
James C Gray, Garland, TX (US);
Control Technology, Dallas, TX (US);
Abstract
Disclosed is a standby power supply system appropriate to supply a set of signal amplifiers within a cable television network. The standby power supply normally operates off of utility company power and alternatively operates from a battery power supply during power failures. Circuitry is disclosed to use battery power during failure mode operation to generate a pulse width modulated alternating current of substantially constant true rms voltage and of substantially constant frequency. Circuitry is also disclosed to cycle charge the battery supply to a desired voltage and then stop the charging cycle and begin timing normal mode operation until another charging cycle. Further, isolating circuitry is disclosed to remove much of the load on the battery supply during normal mode operation. Various safety provisions including soft start provisions, a high current cut off, a low voltage cut off, and protection for the amplification stages is included. Finally, various types of status monitoring equipment are disclosed.