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:
Mar. 26, 1991
Filed:
Mar. 02, 1989
John Houser, Stow, OH (US);
Gary Loughner, Cleveland, OH (US);
Lucerne Products, Inc., Hudson, OH (US);
Abstract
A manually operated switch lever moves arm 105 along resistor 113 to generate a 'raw' motor speed demand signal which is amplified and inverted by amplifiers 115 and 119 to form a 'base line' demand signal. The 'raw' demand signal and a motor load signal at the output of amplifier 154 are compared in amplifier 125 to generate an 'error' signal. The 'error' signal and the 'base line' demand signal are summed in amplifier 129 to form a variable reference voltage which is applied to the non-inverting input of comparator 132. The second input to comparator 132 is a triangular shaped wave which is centered about V/2. When the amplitude of the oscillator output wave exceeds the reference voltage, the output of the comparator 132 is low and switch 160 is off. Thus, variations in the D.C. reference voltage at the output of amplifier 129 control the ON-off duty cycle of MOSFET switch 160 to adjust the power applied to motor 106.