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:
Aug. 13, 1985
Filed:
Aug. 17, 1984
Richard W Midland, Inverness, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A transformerless switching circuit is described for rapidly turning a horizontal output transistor off and on in response to horizontal rate input pulses. The switching circuit includes a first transistor which is rendered alternately conductive and non-conductive by the input pulses, a second transistor which supplies base drive to the horizontal output transistor in response to the first transistor being conductive, and a third transistor which turns off the horizontal output transistor rapidly in response to the first transistor being non-conductive. The conduction level of the second transistor is controlled by temperature compensating means such that base drive to the horizontal output transistor is varied to compensate for temperature induced current gain changes in the output transistor, thereby holding the latter transistor to a substantially constant saturation current.