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. 01, 2020
Filed:
Mar. 30, 2018
Ledvance Llc, Wilmington, MA (US);
Ravidasa Hegde, Andover, MA (US);
Arunava Dutta, Winchester, MA (US);
Nilesh Patel, East Windsor, NJ (US);
LEDVANCE LLC, Wilmington, MA (US);
Abstract
A lamp including a body for containing a light engine that includes at least a first and second string of said light emitters. The lamp includes driver electronics including an AC-DC switching power supply section of a circuit including a first potentiometer for adjusting total current to the light engine; and a linear topology LED string current control section of the circuit including an operational amplifier controlled by a second potentiometer to operate a field effect transistor (FET) in the linear portion of the FETs operation range to adjust a percentage of the total current to the first and second string of the light emitters. Adjusting the total current adjusts the photosynthetic photon flux (PPF) of light emitted by the lamp. Adjusting the percentage of the total current to the first and second string of the light emitters adjusts the spectral power distribution of light being emitted by the lamp.