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:
Jul. 31, 1979
Filed:
Mar. 22, 1978
Applicant:
Inventor:
Jerome A Frazee, Milpitas, CA (US);
Assignee:
Fairchild Camera and Instrument Corporation, Mountain View, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307260 ; 307228 ; 307261 ; 307350 ; 307358 ; 307309 ;
Abstract
An input stage for an automotive ignition control circuit receives a signal from a pick-up device and generates in response thereto a control signal for charging and discharging a coil. The pick-up device is typically an open collector switch which controls the direction of flow of a current into or out of the input stage. This current is used to charge and discharge a capacitor in the input stage to produce a triangular waveform signal having a slope proportional to the duty cycle. The triangular waveform signal, together with a reference voltage signal, control a comparator which, in turn, controls the operation of the coil.