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. 07, 2010
Filed:
Dec. 13, 2005
Subodh K. Ghildyal, Chesterfield, MO (US);
John Gold, Johnson City, NY (US);
Kathleen Ann Gold, Legal Representative, Johnson City, NY (US);
Subodh K. Ghildyal, Chesterfield, MO (US);
John Gold, Johnson City, NY (US);
Kathleen Ann Gold, legal representative, Johnson City, NY (US);
Hubbell Incorporated, Shelton, CT (US);
Abstract
A photo controller circuit for use in hazardous areas has an output switching (OS) circuit comprising an alternistor for ON/OFF switching of a load, and an optoisolator for gating the alternistor. A light to voltage converter (LVC) circuit generates a DC voltage proportional to detected incident light. A hysteresis control (HS) circuit comprises a voltage comparator for generating an output depending on the DC voltage and the state of the OS circuit. An integrator and switching (IS) circuit turns on and activates the optoisolator when the output of the HC circuit indicates the detected incident light is below a selected level, and turns off and deactivates the optoisolator when the output of the HC circuit indicates the detected incident light is above a selected level. The IS circuit time delays the output of the HC circuit prior activating or deactivating the optoisolator. The electronic components are rated for 125° C.