US 11,122,666 B2 · Light emitting diode light structures

Abstract

A Light Emitting Diode (LED) light includes a bridge rectifier configured to be powered by an alternating current power source and to produce a rectified output. Control circuitry couples to the bridge rectifier and is configured to produce a shunt signal when the rectified output is less than a threshold voltage. A series connected Light Emitting Diode (LED) string includes a first group of LEDs and a second group of LEDs. A switch couples to a first side of the second group of LEDs and is controlled by the shunt signal to deactivate the second group of LEDs. The control circuitry may include a ratio metric series resistor string configured to sense a proportion of the rectified output and an inverter configured to generate the shunt signal based on the proportion of the rectified output.

Claims18

Dependent claims

An integrated circuit configured to interface with a series connected Light Emitting Diode (LED) string having a primary group of LEDs and a secondary group of LEDs, a first LED drive input connected to a first side of the primary group of LEDs, a secondary LED drive input connected to a second side of the primary group of LEDs and a first side of the secondary group of LEDs, and a third LED drive input connected to a secondary side of the secondary group of LEDs, the integrated circuit comprising:

a bridge rectifier configured to convert an alternating current power source to a rectified output;
a first drive output configured to couple to the first LED drive input;
a second drive output to the second LED drive input;
a third drive output configured to couple to the third LED drive input;
control circuitry configured to produce a shunt signal based upon a voltage of the rectified output;
and
a switch configured to selectively shunt the second drive output and the third drive output in response to the shunt signal.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/248,132Filed 11 Jan 2021 · continuation

Priority

2 Jan 2013

Published

US 2021/0235562 A129 Jul 2021

Granted

14 Sep 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

H10H 20/857
Packages: interconnections, e.g. lead-frames, bond wires or solder balls
H05B 45/10
Circuit arrangements for operating light-emitting diodes [LED]: controlling the intensity of the light
H05B 45/397
Linear regulators: current mirror circuits
H05B 45/40
Circuit arrangements for operating light-emitting diodes [LED]: details of LED load circuits

Family

Application61/748,306Us provisional application · filed 2 Jan 2013

Application14/145,271Parent of this continuation · filed 31 Dec 2013

Application15/264,475Parent of this continuation · filed 13 Sep 2016

US 9,468,062 B2Parent of this continuation · filed 11 Oct 2016

Application15/795,965Parent of this continuation · filed 27 Oct 2017

US 9,807,836 B2Parent of this continuation · filed 31 Oct 2017

Application16/035,852Parent of this continuation · filed 16 Jul 2018

US 10,028,349 B2Parent of this continuation · filed 17 Jul 2018

Application16/663,846Parent of this continuation · filed 25 Oct 2019

US 10,462,864 B2Parent of this continuation · filed 29 Oct 2019

US 2021/0235562 A1Pre-grant publication · published 29 Jul 2021

US 10,893,586 B2Parent of this continuation

US 2014/0184080 A1Published application

US 2017/0006681 A1Published application

US 2018/0049289 A1Published application

US 2018/0343718 A1Published application

US 2020/0068679 A1Published application

US 11,122,666 B2This patent

From the US filing history. Foreign family members aren’t listed.

Light emitting diode light structures

Life of this patent

Light emitting diode light structures

Life of this patent

Abstract

Claims18