Inventor · disambiguated record
Wanfeng Zhang
Also filed as: ZHANG WANFENG
60 granted patents·4 pending applications·455 citations·filing 2004–2021
98Inventor score
Files withMARVELL WORLD TRADE LTD21MARVELL INT LTD18ZHANG WANFENG8CHOI JINHO4HUAYUAN SEMICONDUCTOR SHENZHEN LTD COMPANY3
Top patents by PatentIndex Score
64 records- 0198US9220136B2Method and apparatus for controlling a lighting deviceMARVELL WORLD TRADE LTD·Filed 2013·Granted Dec 22, 2015·58 cites·14 claims
- 0296US8896288B2TRIAC dimmer detectionCHOI JINHO·Filed 2012·Granted Nov 25, 2014·37 cites·19 claims
- 0395US8558474B1Method and apparatus for dimmingZHANG WANFENG·Filed 2010·Granted Oct 15, 2013·57 cites·20 claims
- 0495US8520415B1Multi-function feedback using an optocouplerKRISHNAMOORTHY RAVISHANKER·Filed 2009·Granted Aug 27, 2013·51 cites·16 claims
- 0594US8937435B1Diode bridgeMARVELL INT LTD·Filed 2013·Granted Jan 20, 2015·24 cites·20 claims
- 0693US9185755B2Regulator for LED lighting color mixingSUTARDJA SEHAT·Filed 2012·Granted Nov 10, 2015·20 cites·17 claims
- 0792US11050350B1Controlling an active clamp switching power converter circuit based on a sensed voltage drop on an auxiliary windingHUAYUAN SEMICONDUCTOR SHENZHEN LTD COMPANY·Filed 2020·Granted Jun 29, 2021·7 cites·17 claims
- 0892US9559675B1Current shaping scheme in TRIAC dimmable LED driverMARVELL INT LTD·Filed 2015·Granted Jan 31, 2017·12 cites·20 claims
- 0992US8344709B2Intelligent switching controller and power conversion circuits and methodsMARVELL WORLD TRADE LTD·Filed 2009·Granted Jan 1, 2013·20 cites·22 claims
- 1091US8698423B2Color mixing system with buck-boost and flyback topologiesMARVELL INT LTD·Filed 2012·Granted Apr 15, 2014·11 cites·23 claims
- 1188US9042124B1Circuits and methods for determining peak currentCHOI JINHO·Filed 2012·Granted May 26, 2015·9 cites·17 claims
- 1288US8847517B2TRIAC dimming systems for solid-state loadsSUTARDJA SEHAT·Filed 2012·Granted Sep 30, 2014·8 cites·21 claims
- 1387US9320097B2Multi-string dimmable LED driverMARVELL WORLD TRADE LTD·Filed 2014·Granted Apr 19, 2016·8 cites·19 claims
- 1485US7317625B2Parallel current mode control using a direct duty cycle algorithm with low computational requirements to perform power factor correctionIWATT INC·Filed 2004·Granted Jan 8, 2008·42 cites·9 claims
- 1584US9480112B2Current shaping for dimmable LEDMARVELL WORLD TRADE LTD·Filed 2014·Granted Oct 25, 2016·5 cites·20 claims
- 1684US8446108B2LED controller with compensation for die-to-die variation and temperature driftZHANG WANFENG·Filed 2011·Granted May 21, 2013·6 cites·18 claims
- 1783US9692316B1Bleeder method using switch node coupling capacitor for TRIAC dimming of solid state lightingMARVELL INT LTD·Filed 2014·Granted Jun 27, 2017·7 cites·5 claims
- 1882US7514913B2Parallel current mode control using a direct duty cycle algorithm with low computational requirements to perform power factor correctionIWATT INC·Filed 2007·Granted Apr 7, 2009·16 cites·33 claims
- 1980US9220138B1Soft bleeder to remove step dimmingMARVELL INT LTD·Filed 2014·Granted Dec 22, 2015·4 cites·19 claims
- 2078US9608527B1Overshoot prevention for deep dimming startupMARVELL INT LTD·Filed 2015·Granted Mar 28, 2017·3 cites·17 claims
- 2178US8374004B2Isolated AC-DC converter with master controller on secondary side and slave controller on primary sideMARVELL WORLD TRADE LTD·Filed 2010·Granted Feb 12, 2013·5 cites·18 claims
- 2277US9954444B1Pfm-pwm control for power regulatorsMARVELL INT LTD·Filed 2015·Granted Apr 24, 2018·3 cites·20 claims
- 2377US8766554B1Method and apparatus for dimmingMARVELL INT LTD·Filed 2013·Granted Jul 1, 2014·3 cites·20 claims
- 2476US9392654B2Method and apparatus for controlling a power adjustment to a lighting deviceMARVELL WORLD TRADE LTD·Filed 2013·Granted Jul 12, 2016·3 cites·17 claims
- 2576US8957602B2Correlated color temperature control methods and devicesZHANG WANFENG·Filed 2012·Granted Feb 17, 2015·3 cites·22 claims
- 2676US8796954B2Dimming control for electronic lampZHANG WANFENG·Filed 2011·Granted Aug 5, 2014·3 cites·20 claims
- 2775US8704455B2Average output current estimation using primary-side sensingCHOI JINHO·Filed 2011·Granted Apr 22, 2014·4 cites·20 claims
- 2874US9246395B1Circuits and methods for determining peak currentMARVELL INT LTD·Filed 2015·Granted Jan 26, 2016·2 cites·20 claims
- 2974US8711584B2Reducing voltage stress in a flyback converter designZHANG HONG LIANG·Filed 2011·Granted Apr 29, 2014·5 cites·14 claims
- 3070US9831772B1Resonant converter with synchronous rectifier feedbackMARVELL INT LTD·Filed 2015·Granted Nov 28, 2017·2 cites·6 claims
- 3169US9445475B1Buck regulator for LED lighting color mixing and/or current compensationSUTARDJA SEHAT·Filed 2012·Granted Sep 13, 2016·2 cites·16 claims
- 3269US8786205B2Method and apparatus for LED lightingZHANG WANFENG·Filed 2012·Granted Jul 22, 2014·2 cites·20 claims
- 3368US8748910B2Systems and methods for integrating LED displays and LED display controllersZHANG WANFENG·Filed 2010·Granted Jun 10, 2014·2 cites·18 claims
- 3467US9485816B2Method and apparatus for dimmable LED driverMARVELL WORLD TRADE LTD·Filed 2014·Granted Nov 1, 2016·1 cites·21 claims
- 3566US9306387B2Current limiting circuit and method for LED driverMARVELL WORLD TRADE LTD·Filed 2013·Granted Apr 5, 2016·1 cites·13 claims
- 3666US9179523B1Start-up voltage for solid-state lighting controllerMARVELL INT LTD·Filed 2014·Granted Nov 3, 2015·2 cites·17 claims
- 3765US9131567B2Temperature foldback circuit for LED load control by constant current sourceMARVELL WORLD TRADE LTD·Filed 2013·Granted Sep 8, 2015·1 cites·20 claims
- 3864US9497807B2Dimmer circuit for electronic loadsPITIGOI-ARON RADU·Filed 2011·Granted Nov 15, 2016·2 cites·23 claims
- 3964US9185760B1Alternating current (AC) line voltage determinationMARVELL INT LTD·Filed 2012·Granted Nov 10, 2015·1 cites·22 claims
- 4061US9829513B2Line voltage detection circuitMARVELL WORLD TRADE LTD·Filed 2014·Granted Nov 28, 2017·1 cites·13 claims
- 4161US9101018B2Apparatuses for bleeding current from a transformer of a solid-state light emitting diodeMARVELL WORLD TRADE LTD·Filed 2014·Granted Aug 4, 2015·0 cites·42 claims
- 4260US9552005B2Systems and methods for estimating an output current of a power conversion circuitMARVELL WORLD TRADE LTD·Filed 2014·Granted Jan 24, 2017·0 cites·16 claims
- 4360US9065330B1Method and apparatus for controlling TRIAC dimmable deviceMARVELL INT LTD·Filed 2012·Granted Jun 23, 2015·1 cites·17 claims
- 4460US2021296996A1Voltage sensing of an active clamp switching power converter circuitHUAYUAN SEMICONDUCTOR SHENZHEN LTD COMPANY·Filed 2021·Application pending·0 cites
- 4559US9148921B2Method and apparatus for altering a color of a mixture of light provided by mixing outputs of light from multiple lampsMARVELL WORLD TRADE LTD·Filed 2014·Granted Sep 29, 2015·0 cites·20 claims
- 4658US9699853B2Method and apparatus for dimmable LED driverMARVELL WORLD TRADE LTD·Filed 2016·Granted Jul 4, 2017·0 cites·20 claims
- 4758US9247621B1Method and apparatus for selectively loading a dimmer circuitMARVELL INT LTD·Filed 2014·Granted Jan 26, 2016·0 cites·16 claims
- 4857US9000684B2LED controller with compensation for die-to-die variation and temperature driftMARVELL WORLD TRADE LTD·Filed 2013·Granted Apr 7, 2015·0 cites·20 claims
- 4957US8749208B2Intelligent switching controller and power conversion circuits and methodsMARVELL WORLD TRADE LTD·Filed 2012·Granted Jun 10, 2014·0 cites·15 claims
- 5056US9117734B2Integrated circuit architecture for light emitting diode-based displaysMARVELL WORLD TRADE LTD·Filed 2014·Granted Aug 25, 2015·0 cites·20 claims
Showing the top 50 of 64 patent records by PatentIndex Score.
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