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:
May. 30, 1978
Filed:
Mar. 24, 1976
Gerald D Smith, Indianapolis, IN (US);
Frank R Owens, Indianapolis, IN (US);
Carson Manufacturing Company, Indianapolis, IN (US);
Abstract
This invention provides overload protection to power components such as power transistors. A pair of driver transistors is connected in push-pull configuration and is coupled through an auto transformer to a pair of power transistors also connected in push-pull configuration. An impedance-matching transformer couples the pair of power transistors to a load circuit, such as a speaker. A low turn winding is connected in series with the secondary winding of the impedance-matching transformer, and drives a high turn winding in a silicon controlled rectifier trigger circuit which is triggered 'on' when an overload condition exists in the low turn winding. Upon conduction of the silicon controlled rectifier, a switching transistor is switched 'on' and this, in turn, switches 'off' a power disabling transistor which is connected directly to, and in power disabling relation to, the pair of driver transistors.