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:
Sep. 19, 1989
Filed:
Dec. 04, 1987
Jacques Nuns, Ecuelles, FR;
Service National Electricite de France, Paris, FR;
Abstract
A regulator system for a switching mode inverter generator feeding an inductively coupled load and seeing the load as a series resonant circuit having a resonant frequency which varies with its magnetic state comprises two switches which connect the load to the output of the inverter. Each switch comprises a switching element and switching terminals. A diode shunts the switching terminals of each switching element of each switch. A control loop slaves the output frequency of the inverter to the resonant frequency of the load. A second control loop is responsive to the inverter power output or the inverter supply voltage. The system is suitable for inductive heating furnaces as used in industry.