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. 16, 1980
Filed:
May. 29, 1979
Edwin M Schaefer, III, North Aurora, IL (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
An inverter-cycloconverter power supply providing for the selective augmentation of the battery source (17) output voltage as needed to compensate for reductions in the effective voltage output of the latter source. The output tap points (for example, 48, 50) of the coupling transformer secondary winding (43) of the cycloconverter section (30) are selected to produce a pseudo-sine wave voltage (FIG. 2, 81) composed of alternating square wave voltages of a first and a second, higher level. A regulator section (60) including a second transformer secondary winding (63) controlled by a pair of thyristors (61, 62) adds a rectified voltage to the battery source (17) voltage as required as determined by regulator control circuitry. The latter comprises monitoring circuit means (83, 84, 85, 86, 87, 92, 95) for detecting the output voltage levels of the cycloconverter and for generating control signals (FIG. 2, 86) of a duration corresponding to the effective voltage drop of the battery source (17). These control signals are employed to energize the regulator (60) thyristors (61, 62) only during the times that the cycloconverter (30) transformer taps (48, 50) are selected which produce the alternating lower voltages as timed under microcomputer (70) control.