Patent Sample 1 – Electrical Engineering

United States Patent      (10) Patent No.: US 8,890,427 B2

Hordinsky et al.      (45) Date of Patent: Nov. 18 2014


(54) APPARATUS AND METHOD OF OPERATION OF A LOW-CURRENT LED LIGHTING CIRCUIT
(71) Applicant: Liteideas, LLC, Mansfield Center, CT
(US)
(72) Inventors: Todd W Hodrinsky, Mansfield Center,
CT (US); Donald T Wesson, Jr.,
Ashford, CT (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 92 days.

(21) Appl.No.: 13/736,157
(22) Filed: Jan. 8, 2013
(65) Prior Publication Data
US 2014/0117866 A1 May 1,2014
Related U.S. Application Data
(60) Provisional application No. 61/718,749, filed on Oct. 26, 2012.
(51) Int. Cl.
H0SB 37/00 (2006.01)
H0SB 39/00 (2006.01)
H0SB 41/14 (2006.01)
G0SF1/607 (2006.01)
H02M1/14 (2006.01)
H0SB 37/02 (2006.01)
(52) U.S. Cl.
CPC H02M1/14 (2013.01); H0SB 37/02 (2013.01)
USPC 315/201; 315/36; 323/227
(58) Field of Classification Search
CPC H05B 37/029; B23K 11/248; H02M 1/02
USPC 315/201, 192, 200, 36
See application file for complete search history.

(56)         References Cited
U.S. PATENT DOCUMENTS

6,700,333 B1 * 3/2004 Hirshi et a1. ……………. .. 315/291
7,221,044 B2 5/2007 Fan et a1.
7,276,861 B1 10/2007 Shteynberg et a1.
7,583,035 B2 9/2009 Shteynberg et a1.
7,598,685 B1 10/2009 Shteynberg et a1.
7,658,510 B2 2/2010 Russell
7,710,047 B2 5/2010 Shteynberg et a1.
7,715,216 B2 * 5/2010 Liu et a1. ………………….. .. 363/89
7,880,400 B2 2/2011 Zhou et a1.
7,888,881 B2 2/2011 Shteynberg et a1.
7,902,769 B2 * 3/2011 Shteynberg et a1. …….. .. 315/291
8,067,896 B2 11/2011 Shteynberg et a1.
8,222,825 B2 7/2012 Kang et a1.
8,299,724 B2 10/2012 Huynh
2009/0167202 A1 7/2009 Miskin et a1.
2009/0289267 A1 11/2009 Burdalski et a1.
2010/0045187 A1 2/2010 Shteynberg et a1.
2010/0060181 A1 3/2010 Choi et a1.
2010/0109558 A1 5/2010 Chew
   (Continued)

Primary Examiner – Dylan White
(74) Attorney, Agent, or Firm – Law Office of Ilya Libenzon


(57)      ABSTRACT

An apparatus and method of operation of a low-current LED lighting circuit are disclosed. The invention utilizes high AC voltage input and unreduced voltage ripple component of the rectified DC power signal, which provides the ability to drive an LED load at high power factor at low current. The invention discloses both active and passive circuits to limit the peak current flowing to the LED and create a current source for the LED load. The proposed circuit increases reliability by optionally eliminating capacitor, inductor, and heatsink components while minimizing luminous flux fluctuations.