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:
Nov. 16, 1976
Filed:
Jan. 17, 1975
Applicant:
Inventors:
Assignee:
Nippondenso Co., Ltd., Aichi, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B / ; H02M / ;
U.S. Cl.
CPC ...
321-6 ; 3072 / ; 307246 ; 307271 ; 324 / ; 328140 ;
Abstract
A frequency-current conversion circuit adapted to a speedometer installed in a vehicle for converting the rate of rotation of an engine to a current signal wherein a first capacitor is charged to a predetermined value during the half cycle of an input signal and, then, a second capacitor is charged with the electric charge stored in the first capacitor during the half cycle of the input signal following the half cycle where the first capacitor is charged. When a voltage across the first capacitor reaches a predetermined value, the second capacitor stops charging. The smoothed direct current signal from the second capacitor, if necessary amplified by a current amplifier, drives a load.