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:
Sep. 22, 1981
Filed:
Sep. 24, 1979
Hilding E Nelson, Scandia, MN (US);
NCR Corporation, Dayton, OH (US);
Abstract
A switching regulated power supply operates over a broad range of input voltage and frequency, and outputs direct current power for computer equipment and the like. The power supply can be paralleled with identical power supplies, thereby satisfying any predetermined power requirement. A charge pump bulk voltage balancing circuit balances voltage on capacitors in an input rectifier and filter circuit. A flux sensing circuit senses magnetizing current in the secondary of a power transformer and the integrated signal is incorporated into pulse duration modulation to achieve dynamic flux balancing of the power transformer through a feedback loop. Output voltage of the power supply connects to a control supply of the power supply, providing power feedback to the control supply to maintain the operating parameters of the power supply as long as the output voltage does not fall below a predetermined level. The power feedback permits the control supply of the power supply to operate the power supply when input voltage is interrupted for a brief time interval. A base drive circuit separates the base drive control signals and power for reliability and drives each of the power transistors through separate transformers. A timing generator provides timing signals used for pulse duration modulation of the power transistors' base switching signals.