Zhang; Wanfeng

Patent Applications and Registrations

Patent applications and USPTO patent grants for Zhang; Wanfeng.The latest application filed is for "voltage sensing of an active clamp switching power converter circuit".

Company Profile

0.79.45

Zhang; Wanfeng - Palo Alto CA
Zhang; Wanfeng - Kingston CA

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Voltage sensing of an active clamp switching power converter circuit using auxiliary winding having an opposite polarity as a primary winding Grant 11,239,740 - Zhang , et al. February 1, 2	2022-02-01
Voltage Sensing Of An Active Clamp Switching Power Converter Circuit App 20210296996 - Choi; Jinho ; et al.	2021-09-23
Voltage Sensing Of An Active Clamp Switching Power Converter Circuit Using Auxiliary Winding Having An Opposite Polarity As A Primary Winding App 20210296991 - Zhang; Wanfeng ; et al.	2021-09-23
Controlling an active clamp switching power converter circuit based on a sensed voltage drop on an auxiliary winding Grant 11,050,350 - Choi , et al. June 29, 2	2021-06-29
Pfm-pwm control for power regulators Grant 9,954,444 - Shu , et al. April 24, 2	2018-04-24
Line voltage detection circuit Grant 9,829,513 - Choi , et al. November 28, 2	2017-11-28
Resonant converter with synchronous rectifier feedback Grant 9,831,772 - Choi , et al. November 28, 2	2017-11-28
Method and apparatus for controlling TRIAC dimmable device Grant 9,729,079 - Peng , et al. August 8, 2	2017-08-08
Method and apparatus for dimmable LED driver Grant 9,699,853 - Zhang , et al. July 4, 2	2017-07-04
Bleeder method using switch node coupling capacitor for TRIAC dimming of solid state lighting Grant 9,692,316 - Ryu , et al. June 27, 2	2017-06-27
Overshoot prevention for deep dimming startup Grant 9,608,527 - Choi , et al. March 28, 2	2017-03-28
Method And Apparatus For Dimmable Led Driver App 20170048943 - ZHANG; Wanfeng ; et al.	2017-02-16
Current shaping scheme in TRIAC dimmable LED driver Grant 9,559,675 - Peng , et al. January 31, 2	2017-01-31
Systems and methods for estimating an output current of a power conversion circuit Grant 9,552,005 - Zhang , et al. January 24, 2	2017-01-24
Current shaping for dimmable LED Grant 9,521,715 - Sutardja , et al. December 13, 2	2016-12-13
Dimmer circuit for electronic loads Grant 9,497,807 - Pitigoi-Aron , et al. November 15, 2	2016-11-15
Method and apparatus for eliminating shimmering Grant 9,490,695 - Wong , et al. November 8, 2	2016-11-08
Method and apparatus for dimmable LED driver Grant 9,485,816 - Zhang , et al. November 1, 2	2016-11-01
Current shaping for dimmable LED Grant 9,480,112 - Sutardja , et al. October 25, 2	2016-10-25
Buck regulator for LED lighting color mixing and/or current compensation Grant 9,445,475 - Sutardja , et al. September 13, 2	2016-09-13
Reduced noise power converter using novel shield Grant 9,425,684 - Choi , et al. August 23, 2	2016-08-23
Method and apparatus for controlling a power adjustment to a lighting device Grant 9,392,654 - Peng , et al. July 12, 2	2016-07-12
Method and apparatus for turning on a lighting device Grant 9,356,534 - Peng , et al. May 31, 2	2016-05-31
Multi-string dimmable LED driver Grant 9,320,097 - Zhang , et al. April 19, 2	2016-04-19
Current limiting circuit and method for LED driver Grant 9,306,387 - Sutardja , et al. April 5, 2	2016-04-05
Method and apparatus for selectively loading a dimmer circuit Grant 9,247,621 - Reed , et al. January 26, 2	2016-01-26
Circuits and methods for determining peak current Grant 9,246,395 - Choi , et al. January 26, 2	2016-01-26
Soft bleeder to remove step dimming Grant 9,220,138 - Zhang , et al. December 22, 2	2015-12-22
Method and apparatus for controlling a lighting device Grant 9,220,136 - Zhang , et al. December 22, 2	2015-12-22
Alternating current (AC) line voltage determination Grant 9,185,760 - Choi , et al. November 10, 2	2015-11-10
Regulator for LED lighting color mixing Grant 9,185,755 - Sutardja , et al. November 10, 2	2015-11-10
Start-up voltage for solid-state lighting controller Grant 9,179,523 - Ryu , et al. November 3, 2	2015-11-03
Method and apparatus for altering a color of a mixture of light provided by mixing outputs of light from multiple lamps Grant 9,148,921 - Zhang , et al. September 29, 2	2015-09-29
Diode emulator circuit Grant 9,144,137 - Sutardja , et al. September 22, 2	2015-09-22
Temperature foldback circuit for LED load control by constant current source Grant 9,131,567 - Zhang September 8, 2	2015-09-08
Integrated circuit architecture for light emitting diode-based displays Grant 9,117,734 - Zhang , et al. August 25, 2	2015-08-25
Apparatuses for bleeding current from a transformer of a solid-state light emitting diode Grant 9,101,018 - Sutardja , et al. August 4, 2	2015-08-04
Method and apparatus for controlling TRIAC dimmable device Grant 9,065,330 - Peng , et al. June 23, 2	2015-06-23
Circuits and methods for determining peak current Grant 9,042,124 - Choi , et al. May 26, 2	2015-05-26
LED controller with compensation for die-to-die variation and temperature drift Grant 9,000,684 - Zhang , et al. April 7, 2	2015-04-07
Current Shaping For Dimmable Led App 20150078047 - SUTARDJA; Sehat ; et al.	2015-03-19
Line Voltage Detection Circuit App 20150077090 - Choi; Jinho ; et al.	2015-03-19
Correlated color temperature control methods and devices Grant 8,957,602 - Zhang , et al. February 17, 2	2015-02-17
Two-peak current control for flyback voltage converters Grant 8,947,895 - Choi , et al. February 3, 2	2015-02-03
Diode bridge Grant 8,937,435 - Sutardja , et al. January 20, 2	2015-01-20
Apparatuses For Bleeding Current From A Transformer Of A Solid-state Light Emitting Diode App 20150015158 - Sutardja; Sehat ; et al.	2015-01-15
Current Shaping For Dimmable Led App 20140347894 - Sutardja; Sehat ; et al.	2014-11-27
TRIAC dimmer detection Grant 8,896,288 - Choi , et al. November 25, 2	2014-11-25
Multi-string Dimmable Led Driver App 20140333216 - ZHANG; Wanfeng ; et al.	2014-11-13
Method And Apparatus For Dimmable Led Driver App 20140327372 - Zhang; Wanfeng ; et al.	2014-11-06
TRIAC dimming systems for solid-state loads Grant 8,847,517 - Sutardja , et al. September 30, 2	2014-09-30
Systems And Methods For Estimating An Output Current Of A Power Conversion Circuit App 20140285169 - Zhang; Wanfeng ; et al.	2014-09-25
Integrated Power Supply Architecture For Light Emitting Diode-based Displays App 20140284635 - Zhang; Wanfeng ; et al.	2014-09-25
Reduced Noise Power Converter Using Novel Shield App 20140239825 - CHOI; Jinho ; et al.	2014-08-28
Primary side voltage control in flyback converter Grant 8,811,046 - Park , et al. August 19, 2	2014-08-19
Control Circuit And Method For Estimating An Output Current Of A Transformer App 20140226371 - CHOI; Jinho ; et al.	2014-08-14
Method and apparatus for current control with LED driver Grant 8,803,438 - Sutardja , et al. August 12, 2	2014-08-12
Method And Apparatus For Altering A Color Of A Mixture Of Light Provided By Mixing Outputs Of Light From Multiple Lamps App 20140217916 - Zhang; Wanfeng ; et al.	2014-08-07
Dimming control for electronic lamp Grant 8,796,954 - Zhang , et al. August 5, 2	2014-08-05
Method and apparatus for LED lighting Grant 8,786,205 - Zhang , et al. July 22, 2	2014-07-22
Method and apparatus for dimming Grant 8,766,554 - Zhang , et al. July 1, 2	2014-07-01
Systems and methods for integrating LED displays and LED display controllers Grant 8,748,910 - Zhang , et al. June 10, 2	2014-06-10
Intelligent switching controller and power conversion circuits and methods Grant 8,749,208 - Zhang , et al. June 10, 2	2014-06-10
Reducing voltage stress in a flyback converter design Grant 8,711,584 - Zhang , et al. April 29, 2	2014-04-29
Temperature Foldback Circuit For Led Load Control By Constant Current Source App 20140111090 - ZHANG; Wanfeng	2014-04-24
Average output current estimation using primary-side sensing Grant 8,704,455 - Choi , et al. April 22, 2	2014-04-22
Color mixing system with buck-boost and flyback topologies Grant 8,698,423 - Zhang , et al. April 15, 2	2014-04-15
Current Limiting Circuit And Method For Led Driver App 20140091714 - Sutardja; Sehat ; et al.	2014-04-03
Method And Apparatus For Controlling A Lighting Device App 20140063857 - PENG; Hao ; et al.	2014-03-06
Method And Apparatus For Controlling A Lighting Device App 20130307434 - ZHANG; Wanfeng ; et al.	2013-11-21
Method and apparatus for dimming Grant 8,558,474 - Zhang , et al. October 15, 2	2013-10-15
Light-emitting diode (LED) driver and controller Grant 8,552,658 - Zhang , et al. October 8, 2	2013-10-08
Led Controller With Compensation For Die-to-die Variation And Temperature Drift App 20130249419 - Zhang; Wanfeng ; et al.	2013-09-26
Multi-function feedback using an optocoupler Grant 8,520,415 - Krishnamoorthy , et al. August 27, 2	2013-08-27
Method And Apparatus For Current Control With Led Driver App 20130162156 - SUTARDJA; Pantas ; et al.	2013-06-27
Color Mixing System With Buck-boost And Flyback Topologies App 20130134905 - Zhang; Wanfeng ; et al.	2013-05-30
LED controller with compensation for die-to-die variation and temperature drift Grant 8,446,108 - Zhang , et al. May 21, 2	2013-05-21
Intelligent Switching Controller And Power Conversion Circuits And Methods App 20130113451 - Zhang; Wanfeng ; et al.	2013-05-09
Regulator For Led Lighting Color Mixing App 20130057163 - Sutardja; Sehat ; et al.	2013-03-07
Method And Apparatus For Led Lighting App 20130049626 - ZHANG; Wanfeng ; et al.	2013-02-28
Isolated AC-DC converter with master controller on secondary side and slave controller on primary side Grant 8,374,004 - Sutardja , et al. February 12, 2	2013-02-12
Correlated Color Temperature Control Methods And Devices App 20130020956 - ZHANG; Wanfeng ; et al.	2013-01-24
Intelligent switching controller and power conversion circuits and methods Grant 8,344,709 - Zhang , et al. January 1, 2	2013-01-01
Triac Dimming Systems For Solid-state Loads App 20120319621 - Sutardja; Sehat ; et al.	2012-12-20
Two-Peak Current Control for Flyback Voltage Converters App 20120230065 - Choi; Jinho ; et al.	2012-09-13
TRIAC Dimmer Detection App 20120212258 - Choi; Jinho ; et al.	2012-08-23
Reducing Voltage Stress In A Flyback Converter Design App 20120163040 - Zhang; Hong Liang ; et al.	2012-06-28
Dimming Control for Electronic Lamp App 20120091910 - Zhang; Wanfeng ; et al.	2012-04-19
Average Output Current Estimation Using Primary-Side Sensing App 20120081029 - Choi; Jinho ; et al.	2012-04-05
Primary Side Voltage Control in Flyback Converter App 20120002449 - Park; Yangsoo ; et al.	2012-01-05
System and Method of Tuning Current for LEDs App 20110266976 - Zhang; Wanfeng ; et al.	2011-11-03
Led Controller With Compensation For Die-to-die Variation And Temperature Drift App 20110241572 - Zhang; Wanfeng ; et al.	2011-10-06
Dimmer Circuit for Electronic Loads App 20110199014 - Pitigoi-Aron; Radu ; et al.	2011-08-18
Integrated Buck Power Supply Architectures For Led-based Displays App 20110148312 - Zhang; Wanfeng ; et al.	2011-06-23
Isolated AC-DC Converter with Master Controller on Secondary Side and Slave Controller on Primary Side App 20110038184 - Sutardja; Sehat ; et al.	2011-02-17
TRANSISTOR Gate Driver for Short Circuit Protection App 20100253395 - Pitigoi-Aron; Radu ; et al.	2010-10-07
Intelligent Switching Controller and Power Conversion Circuits and Methods App 20100090671 - Zhang; Wanfeng ; et al.	2010-04-15
Light-Emitting Diode (LED) Driver and Controller App 20100079081 - ZHANG; Wanfeng ; et al.	2010-04-01
Parallel current mode control using a direct duty cycle algorithm with low computational requirements to perform power factor correction Grant 7,514,913 - Zhang , et al. April 7, 2	2009-04-07
Parallel Current Mode Control Using a Direct Duty Cycle Algorithm with Low Computational Requirements to Perform Power Factor Correction App 20080122422 - Zhang; Wanfeng ; et al.	2008-05-29
Parallel current mode control using a direct duty cycle algorithm with low computational requirements to perform power factor correction Grant 7,317,625 - Zhang , et al. January 8, 2	2008-01-08
Parallel current mode control App 20050270813 - Zhang, Wanfeng ; et al.	2005-12-08