Inventor · disambiguated record
Fred C. Lee
Also filed as: LEE FRED · LEE FRED C
151 granted patents·3 pending applications·6,152 citations·filing 1978–2024
99Inventor score
Files withVIRGINIA TECH INTELL PROP51VIRGINIA TECH INTELLECTUAL PROPERTIES INC35ABBOTT MEDICAL OPTICS INC15JOHNSON & JOHNSON SURGICAL VISION INC12INNOVATIVE TECH CENTER10
Top patents by PatentIndex Score
154 records- 0198US7649434B2Multiphase voltage regulator having coupled inductors with reduced winding resistanceVIRGINIA TECH INTELL PROP·Filed 2006·Granted Jan 19, 2010·184 cites·9 claims
- 0298US4720667AZero-current switching quasi-resonant converters operating in a full-wave modeLEE FRED C·Filed 1986·Granted Jan 19, 1988·330 cites·12 claims
- 0398US4720668AZero-voltage switching quasi-resonant convertersLEE FRED C·Filed 1986·Granted Jan 19, 1988·337 cites·41 claims
- 0497US10790081B2Interleaved converters with integrated magneticsVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2019·Granted Sep 29, 2020·12 cites·20 claims
- 0597US8768251B2Exclusive pairing technique for Bluetooth compliant medical devicesCLAUS MICHAEL J·Filed 2007·Granted Jul 1, 2014·275 cites·21 claims
- 0697US7233132B1Current sensing in multiple coupled inductors by time constant matching to leakage inductanceVIRGINIA TECH INTELL PROP·Filed 2006·Granted Jun 19, 2007·139 cites·20 claims
- 0797US6784644B2Multiphase clamp coupled-buck converter and magnetic integrationVIRGINIA TECH INTELL PROP·Filed 2002·Granted Aug 31, 2004·172 cites·27 claims
- 0897US4857822AZero-voltage-switched multi-resonant converters including the buck and forward typeVIRGINIA TECH INTELL PROP·Filed 1988·Granted Aug 15, 1989·208 cites·4 claims
- 0996US11848140B2Integrated parallel matrix transformer and inductorVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2020·Granted Dec 19, 2023·3 cites·20 claims
- 1096US10668192B2Automatically switching different aspiration levels and/or pumps to an ocular probeJOHNSON & JOHNSON SURGICAL VISION INC·Filed 2017·Granted Jun 2, 2020·23 cites·10 claims
- 1196US8575911B2Digital hybrid V2 control for buck convertersCHENG KUANG-YAO·Filed 2010·Granted Nov 5, 2013·39 cites·14 claims
- 1296US7746041B2Non-isolated bus converters with voltage divider topologyVIRGINIA TECH INTELL PROP·Filed 2007·Granted Jun 29, 2010·134 cites·19 claims
- 1396US7199695B1Multiphase voltage regulator having coupled inductors with reduced winding resistanceVIRGINIA TECH INTELL PROP·Filed 2005·Granted Apr 3, 2007·88 cites·15 claims
- 1496US7071660B2Two-stage voltage regulators with adjustable intermediate bus voltage, adjustable switching frequency, and adjustable number of active phasesVIRGINIA TECH INTELL PROP·Filed 2004·Granted Jul 4, 2006·148 cites·20 claims
- 1596US6330170B1Soft-switched quasi-single-stage (QSS) bi-directional inverter/chargerVIRGINIA TECH INTELL PROP·Filed 2000·Granted Dec 11, 2001·242 cites·13 claims
- 1696US4931716AConstant frequency zero-voltage-switching multi-resonant converterJOVANOVIC MILAN·Filed 1989·Granted Jun 5, 1990·219 cites·11 claims
- 1796US4860184AHalf-bridge zero-voltage switched multi-resonant convertersVIRGINIA TECH INTELL PROP·Filed 1988·Granted Aug 22, 1989·141 cites·6 claims
- 1896US4785387AResonant converters with secondary-side resonanceVIRGINIA TECH INTELL PROP·Filed 1986·Granted Nov 15, 1988·132 cites·14 claims
- 1995US11545900B2Efficient wide voltage range quasi-parallel voltage regulatorVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2020·Granted Jan 3, 2023·4 cites·20 claims
- 2095US8803489B2Adaptive on-time control for power factor correction stage light load efficiencyLI QIAN·Filed 2011·Granted Aug 12, 2014·30 cites·20 claims
- 2195US7742318B2Multi-element resonant convertersVIRGINIA TECH INTELL PROP·Filed 2008·Granted Jun 22, 2010·66 cites·20 claims
- 2295US6452815B1Accelerated commutation for passive clamp isolated boost convertersFiled 2001·Granted Sep 17, 2002·105 cites·22 claims
- 2395US6414469B1Current sensing and current sharingVIRGINIA TECH INTELL PROP·Filed 2000·Granted Jul 2, 2002·72 cites·14 claims
- 2495US5418704AZero-voltage-transition pulse-width-modulated convertersINNOVATIVE TECH CENTER·Filed 1993·Granted May 23, 1995·112 cites·2 claims
- 2594US6349044B1Zero voltage zero current three level dc-dc converterVIRGINIA TECH INTELL PROP·Filed 2000·Granted Feb 19, 2002·160 cites·10 claims
- 2694US5442540ASoft-switching PWM convertersINNOVATIVE TECH CENTER·Filed 1992·Granted Aug 15, 1995·134 cites·4 claims
- 2794US4866367AMulti-loop control for quasi-resonant convertersVIRGINIA TECH INTELL PROP·Filed 1988·Granted Sep 12, 1989·159 cites·5 claims
- 2894US4841220ADc-to-Dc converters using multi-resonant switchesTABISZ WOJCIECH A·Filed 1987·Granted Jun 20, 1989·166 cites·11 claims
- 2993US10910140B2Matrix transformer and winding structureVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2017·Granted Feb 2, 2021·6 cites·8 claims
- 3093US9847710B2Universal system structure for low power adaptersVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2016·Granted Dec 19, 2017·13 cites·10 claims
- 3192US10454381B2Variable DC link converter and transformer for wide output voltage range applicationsVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2017·Granted Oct 22, 2019·5 cites·19 claims
- 3292US7872886B2Quasi-parallel voltage regulatorVIRGINIA TECH INTELL PROP·Filed 2008·Granted Jan 18, 2011·47 cites·15 claims
- 3392US7821375B2Multiphase voltage regulator having coupled inductors with reduced winding resistanceVIRGINIA TECH INTELL PROP·Filed 2007·Granted Oct 26, 2010·21 cites·38 claims
- 3492US5486752AZero-current transition PWM convertersINNOVATIVE TECH CENTER·Filed 1994·Granted Jan 23, 1996·90 cites·15 claims
- 3591US10873265B2Bidirectional three-phase direct current (DC)/DC convertersVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2019·Granted Dec 22, 2020·7 cites·18 claims
- 3691US7791321B2Coupled-inductor multi-phase buck convertersVIRGINIA TECH INTELL PROP·Filed 2007·Granted Sep 7, 2010·25 cites·12 claims
- 3791US6876556B2Accelerated commutation for passive clamp isolated boost convertersVIRGINIA TECH INTELL PROP·Filed 2002·Granted Apr 5, 2005·62 cites·64 claims
- 3891US6696803B2Self-oscillating electronic discharge lamp ballast with dimming controlVIRGINIA TECH INTELL PROP·Filed 2001·Granted Feb 24, 2004·62 cites·17 claims
- 3991US5325283ANovel zero-voltage-switching family of isolated convertersINNOVATIVE TECH CENTER·Filed 1992·Granted Jun 28, 1994·99 cites·6 claims
- 4090US9601997B2V^2 power converter control with capacitor current ramp compensationVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2014·Granted Mar 21, 2017·11 cites·16 claims
- 4190US6944033B1Multi-phase interleaving isolated DC/DC converterVA TECH INTELLECTUAL PROPERTIE·Filed 2003·Granted Sep 13, 2005·84 cites·29 claims
- 4290US5914572ADischarge lamp driving circuit having resonant circuit defining two resonance modesMATSUSHITA ELECTRIC WORKS LTD·Filed 1997·Granted Jun 22, 1999·100 cites·9 claims
- 4390US5262930AZero-voltage transition PWM convertersINNOVATIVE TECH CENTER·Filed 1992·Granted Nov 16, 1993·101 cites·3 claims
- 4489US9678521B2External ramp autotuning for current mode control of switching converterVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2013·Granted Jun 13, 2017·10 cites·8 claims
- 4589US8750796B2Exclusive pairing technique for short-range communication devicesCLAUS MICHAEL J·Filed 2007·Granted Jun 10, 2014·29 cites·20 claims
- 4689US7602154B2Phase compensation driving scheme for synchronous rectifiersVIRGINIA TECH INTELL PROP·Filed 2007·Granted Oct 13, 2009·20 cites·18 claims
- 4789US6989997B2Quasi-resonant DC-DC converters with reduced body diode lossVIRGINIA TECH INTELL PROP·Filed 2003·Granted Jan 24, 2006·71 cites·36 claims
- 4888US11404967B2Interleaved converters with integrated magneticsVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2018·Granted Aug 2, 2022·3 cites·20 claims
- 4988US10217559B2Multiphase coupled and integrated inductors with printed circuit board (PBC) windings for power factor correction (PFC) convertersVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2017·Granted Feb 26, 2019·6 cites·20 claims
- 5088US10110122B2Transient performance improvement for constant on-time power convertersVIRGINIA TECH INTELLECTUAL PROPERTIES INC·Filed 2015·Granted Oct 23, 2018·7 cites·19 claims
Showing the top 50 of 154 patent records by PatentIndex Score.
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