Sahil Singh

US Patent:

20130069561, Mar 21, 2013

Filed:

Nov 9, 2012

Appl. No.:

13/673879

Inventors:

CIRRUS LOGIC, INC. - Austin TX, US
Alfredo R. Linz - Austin TX, US
Michael A. Kost - Austin TX, US
Sahil Singh - Austin TX, US

Assignee:

CIRRUS LOGIC, INC. - Austin TX

International Classification:

H05B 37/02

US Classification:

315297

Abstract:

A lighting system includes methods and systems to mix colors of light emitted from at least two LED emitters. In at least one embodiment, the lighting system includes a controller that responds to phase-cut angles of the dimming signal and correlates the phase-cut angles with a predetermined black body radiation function to dynamically adjust a color spectra of the mixed light in response to changes in phase cut angles of the phase-cut dimming level signal. In at least one embodiment, the controller utilizes the predetermined black body radiation function to dynamically adjust the color spectra of the mixed, emitted light in response to changes in phase cut angles of a phase-cut dimming level signal. In at least one embodiment, the predetermined black body radiation function specifies correlated color temperatures (CCTs) that model the CCTs of an actual non-LED based lamp, such as an incandescent lamp.

US Patent:

20140028214, Jan 30, 2014

Filed:

Sep 27, 2013

Appl. No.:

14/039355

Inventors:

Michael A. Kost - Austin TX, US
Yanhui Xie - Austin TX, US
Sahil Singh - Austin TX, US

Assignee:

Cirrus Logic, Inc. - Austin TX

International Classification:

H05B 33/08

US Classification:

315279

Abstract:

A controller may be configured to: (i) predict based on an electronic transformer secondary signal an estimated occurrence of a high-resistance state of a trailing-edge dimmer coupled to a primary winding of an electronic transformer, wherein the high-resistance state occurs when the trailing-edge dimmer begins phase-cutting an alternating current voltage signal; (ii) operate a power converter in a trailing-edge exposure mode for a first period of time immediately prior to the estimated occurrence of the high-resistance state, such that the power converter is enabled to transfer energy from the secondary winding to the load during the trailing-edge exposure mode; and (iii) operate the power converter in a power mode for a second period of time prior to and non-contiguous with the first period of time, such that the power converter is enabled to transfer energy from the secondary winding to the load during the power mode.

US Patent:

20120242242, Sep 27, 2012

Filed:

Mar 26, 2012

Appl. No.:

13/430601

Inventors:

Alfredo R. Linz - Austin TX, US
Michael A. Kost - Cedar Park TX, US
Sahil Singh - Austin TX, US

International Classification:

H05B 37/02

US Classification:

315210, 315297

Abstract:

A lighting system includes one or more methods and systems to control the color spectrum of a lamp in response to both temperature and dim levels. In at least one embodiment, the lighting system includes a controller to control a correlated color temperature (CCT) and intensity of the lamp by independently adjusting currents to electronic light sources based on a dim level of the lighting system and temperature of the lighting system. The controller controls a first current to a first set of LEDs and a second current to a second set of LEDs. The control of the first current by the controller is jointly dependent on a dim level and temperature in the lighting system. In at least one embodiment, the control of the second current is dependent on the dim level or the dim level and temperature.

US Patent:

20150303796, Oct 22, 2015

Filed:

Sep 24, 2014

Appl. No.:

14/495564

Inventors:

- Austin TX, US
Mohit Sood - Cedar Park TX, US
Rahul Singh - Austin TX, US
Sahil Singh - Austin TX, US

International Classification:

H02M 3/156

Abstract:

A controller may be configured to generate a control signal to activate and deactivate a switch of a switching power converter in order to control a switching period and a peak current of the switching power converter to maintain a regulated current of the switching power converter at a desired current level such that: if the switching period decreases below a minimum switching period, the controller increases the switching period by a ringing period of a voltage of the switch and increases the peak current to compensate for the increase of the switching period in order to maintain the regulated current, and if the peak current increases above a maximum peak current, the controller decreases the switching period by a ringing period of the voltage of the switch and decreases the peak current to compensate for the decrease of the switching period in order to maintain the regulated current.

US Patent:

20150061536, Mar 5, 2015

Filed:

Apr 30, 2014

Appl. No.:

14/266003

Inventors:

- Austin TX, US
Sahil Singh - Austin TX, US
Michael A. Kost - Austin TX, US

Assignee:

Cirrus Logic, Inc. - Austin TX

International Classification:

H05B 33/08
H02M 3/335

US Classification:

315291, 363 16

Abstract:

In accordance with embodiments of the present disclosure, an apparatus may comprise a controller to provide compatibility between a load and a secondary winding of an electronic transformer. The controller may be configured to operate a single-stage power converter in a first power mode for a first period of time, such that the single-stage power converter is enabled to transfer energy from the secondary winding to the load during the first power mode and operate the single-stage power converter in a second power mode for a second period of time prior to the first period of time, such that the single-stage power converter is enabled to transfer energy from the secondary winding to the load during the second power mode, wherein the first power mode and the second power mode occur within a half-line cycle of an electronic transformer secondary signal present on the secondary winding.