Inventor · disambiguated record
William Hemena
Also filed as: HEMENA WILLIAM
26 granted patents·1 pending application·977 citations·filing 1994–2006
97Inventor score
Top patents by PatentIndex Score
27 records- 0193US6487098B2Power factor correction (PFC) circuit that eliminates an inrush current limit circuitIBM·Filed 2001·Granted Nov 26, 2002·85 cites·18 claims
- 0293US6487095B1Multiphase zero-volt-switching resonant DC-DC regulatorIBM·Filed 2001·Granted Nov 26, 2002·105 cites·23 claims
- 0386US6445165B1Circuit for limiting inrush current to a power sourceIBM·Filed 2001·Granted Sep 3, 2002·53 cites·19 claims
- 0484US6522190B1High efficiency multiple input voltage sources power supplyIBM·Filed 2001·Granted Feb 18, 2003·52 cites·23 claims
- 0584US6181114B1Boost circuit which includes an additional winding for providing an auxiliary output voltageIBM·Filed 1999·Granted Jan 30, 2001·71 cites·3 claims
- 0683US6320771B1Fault tolerant active current sharingIBM·Filed 2000·Granted Nov 20, 2001·56 cites·8 claims
- 0779US5561596AAC line stabilization circuitry for high power factor loadsIBM·Filed 1994·Granted Oct 1, 1996·35 cites·24 claims
- 0877US6188588B1Switching controller and method for operating a flyback converter in a critically continuous conduction modeIBM·Filed 1999·Granted Feb 13, 2001·52 cites·18 claims
- 0977US6081752AComputer system having power supply primary sense to facilitate performance of tasks at power offIBM·Filed 1997·Granted Jun 27, 2000·91 cites·2 claims
- 1076US6697955B1Method and apparatus for using an energy reserve to provide voltage to a power factor correction circuit in the event of a power interuptionIBM·Filed 2000·Granted Feb 24, 2004·31 cites·29 claims
- 1170US6865094B2Circuit for AC adapter to reduce power drawn from an AC power sourceIBM·Filed 2003·Granted Mar 8, 2005·28 cites·10 claims
- 1270US6249411B1Over-voltage protection circuit and method for preventing system shutdown in a power system employing multiple power suppliesIBM·Filed 1999·Granted Jun 19, 2001·54 cites·20 claims
- 1369US6850396B1Fail safe circuit with reset capability for a power supplyIBM·Filed 2000·Granted Feb 1, 2005·15 cites·24 claims
- 1469US6747424B1Integrated fan speed control and fault detection circuitryIBM·Filed 2000·Granted Jun 8, 2004·16 cites·16 claims
- 1569US6297970B2Multiple output synchronous rectifier circuit providing zero volt switch mode operationIBM·Filed 1999·Granted Oct 2, 2001·37 cites·10 claims
- 1668US6448744B1Power factor correction circuitIBM·Filed 2000·Granted Sep 10, 2002·17 cites·7 claims
- 1766US6160724ABoost doubler circuit wherein an AC bridge rectifier is not requiredIBM·Filed 1999·Granted Dec 12, 2000·31 cites·11 claims
- 1865US6434026B1Multiple output power supply circuitIBM·Filed 2000·Granted Aug 13, 2002·19 cites·12 claims
- 1965US6400582B1Dual forward power converter utilizing coupling capacitors for improved efficiencyIBM·Filed 2000·Granted Jun 4, 2002·19 cites·20 claims
- 2063US6442052B1High efficiency power converter with fast transient responseIBM·Filed 2001·Granted Aug 27, 2002·18 cites·20 claims
- 2161US6621718B1Resonant converter circuitIBM·Filed 2000·Granted Sep 16, 2003·15 cites·9 claims
- 2261US6615146B1Failure detection of an isolation device with PFA signal generation in a redundant power supply systemIBM·Filed 2000·Granted Sep 2, 2003·9 cites·7 claims
- 2358US6157555ACurrent limiter responsive to changing parallel power supply capacityIBM·Filed 1999·Granted Dec 5, 2000·34 cites·10 claims
- 2456US6160386AParallel power system which includes over voltage protectionIBM·Filed 1999·Granted Dec 12, 2000·28 cites·14 claims
- 2550US6621180B2Method and system for maintaining full power during a power interruption in a multiple power supply systemIBM·Filed 2001·Granted Sep 16, 2003·6 cites·13 claims
- 2636US2007253134A1Protection of EMC filter components due to failure of boost stage/circuit to prevent smoke, sound or fire in a boost stage under fault conditionCOVI KEVIN R·Filed 2006·Application pending·0 cites
- 2734US6459603B1Adapter circuit for selectively doubling input voltage depending upon connector typeIBM·Filed 2001·Granted Oct 1, 2002·0 cites·20 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →