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:
Apr. 26, 1977
Filed:
Oct. 02, 1975
Jon H Grant, Fullerton, CA (US);
Etatech, Inc., Placentia, CA (US);
Abstract
A pulse width modulated DC-to-DC power converter wherein a single ended transformer circuit includes a single switch transistor at the input and a rectifier at the output. A control circuit to the switch transistor base is powered by a drive winding on the transformer which is shunted by the primary winding of a saturable reactor. A regenerative winding opposing, and in series with, the drive winding provides the regenerative drive necessary to support oscillation of the circuit at a frequency determined by the saturation period of the saturable reactor. A resistor between the drive winding and the saturable reactor establishes both the magnitude of the drive current and the magnetizing current of the transformer. Pulse width modulation of the DC output is attained by a single, isolated DC voltage at the secondary of the saturable reactor. Supplemental circuitry provides for regulation of the isolated DC voltage to produce a constant output voltage and for protection of the switch transistor against overloads.