Inventor · disambiguated record
Wei-Hsu Chang
Also filed as: CHANG WEI · CHANG WEI-HSU
76 granted patents·22 pending applications·352 citations·filing 2003–2025
98Inventor score
Files withRICHTEK TECHNOLOGY CORP47UNITY OPTO TECHNOLOGY CO LTD33CHANG WEI-HSU5CHANG WEI2LIN YU CHENG2
Top patents by PatentIndex Score
98 records- 0197US10103616B1Flyback power converter circuit with active clamping and zero voltage switching and conversion control circuit thereofRICHTEK TECHNOLOGY CORP·Filed 2018·Granted Oct 16, 2018·19 cites·24 claims
- 0296US8941328B2Variable power dimming control circuitUNITY OPTO TECHNOLOGY CO LTD·Filed 2013·Granted Jan 27, 2015·47 cites·9 claims
- 0394US8030911B2Hybrid control circuit and methodRICHTEK TECHNOLOGY CORP·Filed 2010·Granted Oct 4, 2011·27 cites·21 claims
- 0493US8941323B1Ceiling lamp adopting non-separating driver circuitUNITY OPTO TECHNOLOGY CO LTD·Filed 2013·Granted Jan 27, 2015·23 cites·5 claims
- 0592US12136877B2Switched capacitor voltage converter circuit and switched capacitor voltage conversion methodRICHTEK TECHNOLOGY CORP·Filed 2023·Granted Nov 5, 2024·2 cites·17 claims
- 0691US9072149B2LED driving device with open circuit protection and color temperature and brightness adjustmentUNITY OPTO TECHNOLOGY CO LTD·Filed 2013·Granted Jun 30, 2015·18 cites·5 claims
- 0789US10181782B2Flyback power converter circuit with active clamping and zero voltage switching and conversion control circuit thereofRICHTEK TECHNOLOGY CORP·Filed 2018·Granted Jan 15, 2019·6 cites·19 claims
- 0889US9572221B2Auto-sensing dimming lampUNITY OPTO TECHNOLOGY CO LTD·Filed 2015·Granted Feb 14, 2017·7 cites·11 claims
- 0988USD728480SLED lamp holderUNITY OPTO TECHNOLOGY CO LTD·Filed 2013·Granted May 5, 2015·43 cites·1 claims
- 1088US8860483B2Pulse width modulation signal generation circuit and pulse width modulation signal generation methodWANG JO-YU·Filed 2013·Granted Oct 14, 2014·9 cites·9 claims
- 1187US8710745B1LED drive circuitUNITY OPTO TECHNOLOGY CO LTD·Filed 2012·Granted Apr 29, 2014·10 cites·6 claims
- 1286US11581797B2Multiple outputs universal serial bus travel adaptor and control method thereofRICHTEK TECHNOLOGY CORP·Filed 2022·Granted Feb 14, 2023·1 cites·14 claims
- 1384US11139742B2Switching controller circuit and method for controlling flyback power converterRICHTEK TECHNOLOGY CORP·Filed 2020·Granted Oct 5, 2021·2 cites·22 claims
- 1484US9674908B1Secondary-side bucking and current-stabilizing flyback power converterUNITY OPTO TECHNOLOGY CO LTD·Filed 2016·Granted Jun 6, 2017·5 cites·5 claims
- 1583US7548048B2Switching mode power supply and method for determining a compensation factor thereofRICHTEK TECHNOLOGY CORP·Filed 2007·Granted Jun 16, 2009·17 cites·21 claims
- 1682US9167645B1Driver circuit for improving LED flickersUNITY OPTO TECHNOLOGY CO LTD·Filed 2015·Granted Oct 20, 2015·5 cites·9 claims
- 1782US7876075B1Control circuit and method for a power converterRICHTEK TECHNOLOGY CORP·Filed 2010·Granted Jan 25, 2011·10 cites·9 claims
- 1881US10645781B1High-voltage linear drive and memory dimming LED lighting deviceUNITY OPTO TECHNOLOGY CO LTD·Filed 2019·Granted May 5, 2020·3 cites·8 claims
- 1978US10715028B2Flyback power converter and ZVS control circuit and control method thereofRICHTEK TECHNOLOGY CORP·Filed 2019·Granted Jul 14, 2020·3 cites·30 claims
- 2076US11139744B2Flyback power converter and secondary side controller circuit and control method thereofRICHTEK TECHNOLOGY CORP·Filed 2020·Granted Oct 5, 2021·1 cites·24 claims
- 2176US7656136B2Digital voltage converter with constant off-time and variable on-time of controllerRICHTEK TECHNOLOGY CORP·Filed 2007·Granted Feb 2, 2010·12 cites·14 claims
- 2274US9966770B2Charging apparatus and charging control circuit and control method thereofRICHTEK TECHNOLOGY CORP·Filed 2016·Granted May 8, 2018·2 cites·13 claims
- 2374US9198243B2LED driver circuit for supplying TRIAC holding current by using controllable current sourceUNITY OPTO TECHNOLOGY CO LTD·Filed 2014·Granted Nov 24, 2015·3 cites·5 claims
- 2474US8896223B2Light emitting diode driving deviceWU CHIH-HSIEN·Filed 2012·Granted Nov 25, 2014·3 cites·8 claims
- 2574US2025253756A1Power supply systemRICHTEK TECHNOLOGY CORP·Filed 2025·Application pending·0 cites
- 2673US10601238B2Charging apparatus and charging control circuit thereof and charging control methodRICHTEK TECHNOLOGY CORP·Filed 2016·Granted Mar 24, 2020·2 cites·19 claims
- 2773US10528067B2Interface device and interface temperature monitoring deviceRICHTEK TECHNOLOGY CORP·Filed 2018·Granted Jan 7, 2020·1 cites·19 claims
- 2872US10278255B1Light-emitting device with digital control of color temperature modulation and application thereofUNITY OPTO TECHNOLOGY CO LTD·Filed 2018·Granted Apr 30, 2019·3 cites·18 claims
- 2971US8994310B2Motor controller having multi-functional pin and control method thereofWU YU-KUANG·Filed 2013·Granted Mar 31, 2015·4 cites·10 claims
- 3070US11843344B2Brushless DC electric (BLDC) motor driver circuitRICHTEK TECHNOLOGY CORP·Filed 2021·Granted Dec 12, 2023·0 cites·14 claims
- 3170US9985009B2Manufacturing method of LED light emitting deviceUNITY OPTO TECHNOLOGY CO LTD·Filed 2016·Granted May 29, 2018·2 cites·3 claims
- 3269US8558521B2Operating phase number dependent compensation of a multi-phase buck converterCHANG WEI-HSU·Filed 2010·Granted Oct 15, 2013·4 cites·6 claims
- 3368US12483120B2Power supply system with power factor correction(PFC) and control method thereofRICHTEK TECHNOLOGY CORP·Filed 2024·Granted Nov 25, 2025·0 cites·21 claims
- 3468US12381470B2Power supply systemRICHTEK TECHNOLOGY CORP·Filed 2023·Granted Aug 5, 2025·0 cites·4 claims
- 3568US11329491B2Distributed battery balance management method and battery system using this methodRICHTEK TECHNOLOGY CORP·Filed 2020·Granted May 10, 2022·1 cites·32 claims
- 3668US8525497B2Using offset cancellation circuit to mitigate beat-frequency oscillation of phase currents in a multiphase interleaved voltage regulatorCHIU CHEN-HUA·Filed 2011·Granted Sep 3, 2013·4 cites·9 claims
- 3767US11137733B2Foreign object detection method and power system capable of detecting foreign objectRICHTEK TECHNOLOGY CORP·Filed 2020·Granted Oct 5, 2021·0 cites·7 claims
- 3867US8436594B2Control circuit and method for a digital synchronous switching converterFU YI-CHIANG·Filed 2009·Granted May 7, 2013·11 cites·10 claims
- 3966US11843321B2Control circuit having power saving mode for use in power supply circuitRICHTEK TECHNOLOGY CORP·Filed 2021·Granted Dec 12, 2023·0 cites·21 claims
- 4066US10181734B2Charging control method and charging system, power delivery unit, and power receiver control circuit using the methodRICHTEK TECHNOLOGY CORP·Filed 2016·Granted Jan 15, 2019·1 cites·19 claims
- 4165US9435491B2LED lead frame and lamp thereofUNITY OPTO TECHNOLOGY CO LTD·Filed 2013·Granted Sep 6, 2016·2 cites·2 claims
- 4264US12273035B2Control circuit and method for use in stackable multiphase power converterRICHTEK TECHNOLOGY CORP·Filed 2023·Granted Apr 8, 2025·0 cites·27 claims
- 4364US9544963B2Self-excited TRIAC dimming circuitUNITY OPTO TECHNOLOGY CO LTD·Filed 2014·Granted Jan 10, 2017·1 cites·1 claims
- 4462US12483121B2Power supply system and power factor correction control circuit and control method thereofRICHTEK TECHNOLOGY CORP·Filed 2023·Granted Nov 25, 2025·0 cites·28 claims
- 4562US10705497B2Foreign object detection method and power system capable of detecting foreign objectRICHTEK TECHNOLOGY CORP·Filed 2018·Granted Jul 7, 2020·0 cites·23 claims
- 4662USD794866SLED bulb lamp coverUNITY OPTO TECHNOLOGY CO LTD·Filed 2016·Granted Aug 15, 2017·10 cites·1 claims
- 4762US8766560B1Adaptive light emitting diode dimming driving circuitUNITY OPTO TECHNOLOGY CO LTD·Filed 2013·Granted Jul 1, 2014·1 cites·5 claims
- 4861US12456913B2Resonant switched capacitor voltage converter and control method thereofRICHTEK TECHNOLOGY CORP·Filed 2023·Granted Oct 28, 2025·0 cites·20 claims
- 4961US12107492B2Power factor correction converter, controller and zero current prediction circuit thereofRICHTEK TECHNOLOGY CORP·Filed 2022·Granted Oct 1, 2024·0 cites·28 claims
- 5061US11876189B2Battery system, battery module and battery control circuit thereofRICHTEK TECHNOLOGY CORP·Filed 2020·Granted Jan 16, 2024·0 cites·18 claims
Showing the top 50 of 98 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →