Jun Zhang

US Patent:

20140077709, Mar 20, 2014

Filed:

Sep 14, 2012

Appl. No.:

13/616368

Inventors:

Jun Zhang - Cary NC, US
Liqin Ni - Cary NC, US

International Classification:

H05B 37/00

US Classification:

315188, 315193

Abstract:

A lighting apparatus includes a rectifier circuit configured to be coupled to an AC source and to produce a rectified voltage from an AC voltage and a string including at least two serially-connected LED segments and coupled to the rectifier circuit. A segment control circuit is configured to selectively bypass at least one segment of the string responsive to the rectified voltage. An energy storage circuit is coupled to the rectifier circuit and controls current flow between at least one energy storage device and the string. A control circuit controls the segment control circuit and the energy storage circuit. The segment control circuit may support a current from the rectifier circuit through all of the segments in the string circuit at a peak of the rectified voltage and the energy storage circuit may charge the at least one energy storage device to a voltage near the peak of the rectified voltage.

US Patent:

20180199405, Jul 12, 2018

Filed:

Mar 5, 2018

Appl. No.:

15/911953

Inventors:

- Durham NC, US
Jun Zhang - Cary NC, US
Michael B. Gilliom - Raleigh NC, US

International Classification:

H05B 33/08
H05B 37/02

Abstract:

An LED lighting device comprises at least one LED selectively energizable to develop light and a control circuit coupled to the LED that develops a command signal comprising first and second command signal components for controlling the at least one LED to cause the LED to develop light comprising a desired brightness in response to the first command signal component. The control circuit controls the at least one LED to cause the LED to develop light comprising a further desired parameter magnitude other than desired brightness in response to the second command signal component, and the first signal component comprises an IEC 0-10 volt analog lighting control.

US Patent:

20170006673, Jan 5, 2017

Filed:

Jul 1, 2015

Appl. No.:

14/789520

Inventors:

- Durham NC, US
Jun Zhang - Cary NC, US
Michael B. Gilliom - Raleigh NC, US

International Classification:

H05B 33/08
H05B 37/02

Abstract:

According to one aspect, a control system for an LED luminaire includes a dimming control circuit that develops an analog dimming command signal that is variable between zero volts and ten volts to command LED brightness. The control system further includes a modulation circuit coupled to the dimming control circuit. The modulation circuit modifies the analog dimming command signal so as to include digital data for further commanding a parameter of LED operation.

US Patent:

20140225520, Aug 14, 2014

Filed:

Apr 18, 2014

Appl. No.:

14/256573

Inventors:

- Durham NC, US
Jun Zhang - Cary NC, US

Assignee:

Cree, Inc. - Durham NC

International Classification:

H05B 33/08

US Classification:

315188

Abstract:

A lighting apparatus includes a solid-state lighting circuit, at least one ballast connection port and at least one low-frequency blocking impedance coupling the at least one ballast connection port to the solid-state lighting circuit. In some embodiments, the at least one low-frequency blocking impedance may be configured to block a DC offset. In further embodiments, the at least one low-frequency blocking impedance may be configured to block a nominally 60 Hz frequency component. The at least one ballast connection port may include a first ballast connection port and a second ballast connection port and the at least one low-frequency blocking impedance may include a first low-frequency blocking impedance coupling the first ballast connection port to a first terminal of the solid-state lighting circuit and a second low-frequency blocking impedance coupling the second ballast connection port to a second input terminal of the solid-state lighting circuit.

US Patent:

20140203717, Jul 24, 2014

Filed:

Oct 16, 2013

Appl. No.:

14/055264

Inventors:

- Durham NC, US
Jun Zhang - Cary NC, US

Assignee:

Cree, Inc. - Durham NC

International Classification:

H05B 33/08

US Classification:

315188

Abstract:

A lighting apparatus includes a solid-state lighting circuit, a ballast connection port including first and second terminals and a filament-imitating impedance coupled between the first and a second terminals of the ballast connection port and to an input terminal of the solid-state lighting circuit. The filament-imitating impedance may be configured to transfer power at a nominal frequency of an output produced by the ballast and to provide an impedance between the first and second terminals of the ballast connection port that prevents shutdown of the ballast. In some embodiments, the filament-imitating impedance may vary with temperature, e.g., the filament-imitating impedance may be configured to imitate a temperature dependence of a fluorescent tube filament. The lighting apparatus may be included in a fluorescent lamp replacement lamp.

US Patent:

20140132164, May 15, 2014

Filed:

Jul 16, 2013

Appl. No.:

13/943376

Inventors:

- Durham NC, US
Jun Zhang - Cary NC, US

International Classification:

H05B 33/08

US Classification:

315187, 315185 R

Abstract:

Emergency lighting devices and methods are disclosed. An emergency lighting device includes a passive resonant converter circuit configured to be coupled to an emergency lighting module and to an input end of a group of solid state emitters, at which the group of solid state emitters receives a normal operation current from an LED driver. The passive resonant converter circuit is configured to receive an emergency operation current from the emergency lighting module and to provide a converted emergency operation current to the group of solid state emitters at an emergency input of the group of solid state emitters in response to the emergency operation current. The emergency lighting module may be a fluorescent emergency lighting module.