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:
Jan. 11, 1994
Filed:
Apr. 24, 1992
Michael A Wilson, Deland, FL (US);
Fasco Controls Corporation, Shelby, NC (US);
Abstract
The detector applies an analog input signal through respectively positive and negative offset voltages to the inputs of two comparators, one of which produces a first output signal as the input signal passes beyond a predetermined minimum voltage in the positive going direction, and the other of which produces a second output signal when the input voltage exceeds a minimum predetermined value in a negative going direction. The input signal is also applied directly to the input of a third comparator the output of which produces a third signal each time the input signal crosses over zero voltage in a positive going direction. The first and second comparator output signals are applied to the reset and set terminals, respectively, of a first flip flop. The output of this first flip flop, and the output of the third comparator are applied through an AND gate to the set terminal of a second flip flop. The second flip flop produces at its output a digital signal precisely at the time that a signal is produced at the output of the third comparator, provided the outputs of the first and second comparators have been successively generated in the cycle of the input voltage immediately preceding the output signal of the third comparator.