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. 12, 1987
Filed:
Jul. 10, 1985
Yokogawa Hokushin Electric Corporation, Tokyo, JP;
Abstract
An electromagnetic flowmeter using an exciting current of a rectangular wave form supplied to an exciting coil for excitation, wherein a DC voltage produced by rectifying a frequency power source, is applied by way of a voltage regulating circuit to an exciting circuit, and a switching device is connected in series between the exciting circuit and the voltage regulating circuit and is controlled by a DC reference voltage determining the level of the exciting voltage and a timing signal determining the switching timing for the exciting current. The invention enables accurate and rapid control of the waveform of the exciting current, reduces costs, and can be used for different voltages without any substantial change of circuitry.