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:
Jul. 09, 2024
Filed:
Dec. 22, 2018
Multitech Medical Devices Usa Llc, Holtsville, NY (US);
Lenny Novikov, Cliffside Park, NJ (US);
John William Weiss, Oakdale, NY (US);
Multitech Medical Devices USA LLC, Melville, NY (US);
Abstract
Disclosed is a temperature control and safety circuit for detecting the temperature of a PTC heating element and the status of a solid state switch powered by an AC power source in both a positive and a negative power voltage half cycle. The AC-powered solid state switch, e.g., a triac, is provided in series with a current sense resistor, the voltage drop across the resistor being proportional to current through the PTC heating element. A voltage shifting circuit is also provided for rendering a positive voltage to an analog to digital converter during both a positive and a negative half cycle. Preferably, the voltage input to the analog to digital converter controls, at least in part, the temperature of the PTC heating element and the status of the AC-powered solid state switch during both of the positive and negative half cycles.