William Hemena

Person

Raleigh, NC, US

People

Patents Grantslast 30 patents

Information Patent Grant
Circuit for AC adapter to reduce power drawn from an AC power source
- Patent number 6,865,094
- Issue date Mar 8, 2005
- International Business Machines Corporation
- Randhir S. Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Fail safe circuit with reset capability for a power supply
- Patent number 6,850,396
- Issue date Feb 1, 2005
- International Business Machines Corporation
- Raymond Mathew Clemo
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Integrated fan speed control and fault detection circuitry
- Patent number 6,747,424
- Issue date Jun 8, 2004
- International Business Machines Corporation
- Randhir S. Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method and apparatus for using an energy reserve to provide voltage...
- Patent number 6,697,955
- Issue date Feb 24, 2004
- International Business Machines Corporation
- Randhir S. Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method and system for maintaining full power during a power interru...
- Patent number 6,621,180
- Issue date Sep 16, 2003
- International Business Machines Corporation
- Cecil C. Dishman
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Resonant converter circuit
- Patent number 6,621,718
- Issue date Sep 16, 2003
- International Business Machines Corporation
- Randhir S. Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Failure detection of an isolation device with PFA signal generation...
- Patent number 6,615,146
- Issue date Sep 2, 2003
- International Business Machines Corporation
- Randhir Singh Malik
- G01 - MEASURING TESTING
Information Patent Grant
High efficiency multiple input voltage sources power supply
- Patent number 6,522,190
- Issue date Feb 18, 2003
- International Business Machines Corporation
- Randhir Singh Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Multiphase zero-volt-switching resonant DC-DC regulator
- Patent number 6,487,095
- Issue date Nov 26, 2002
- International Business Machines Corporation
- Randhir Singh Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power factor correction (PFC) circuit that eliminates an inrush cur...
- Patent number 6,487,098
- Issue date Nov 26, 2002
- International Business Machines Corporation
- Randhir S. Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Adapter circuit for selectively doubling input voltage depending up...
- Patent number 6,459,603
- Issue date Oct 1, 2002
- International Business Machines Corporation
- Randhir Singh Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power factor correction circuit
- Patent number 6,448,744
- Issue date Sep 10, 2002
- International Business Machines Corporation
- Randhir S. Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Circuit for limiting inrush current to a power source
- Patent number 6,445,165
- Issue date Sep 3, 2002
- International Business Machines Corporation
- Randhir Singh Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
High efficiency power converter with fast transient response
- Patent number 6,442,052
- Issue date Aug 27, 2002
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Multiple output power supply circuit
- Patent number 6,434,026
- Issue date Aug 13, 2002
- International Business Machines Corporation
- Randhir S. Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Dual forward power converter utilizing coupling capacitors for impr...
- Patent number 6,400,582
- Issue date Jun 4, 2002
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Fault tolerant active current sharing
- Patent number 6,320,771
- Issue date Nov 20, 2001
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Multiple output synchronous rectifier circuit providing zero volt s...
- Patent number 6,297,970
- Issue date Oct 2, 2001
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Over-voltage protection circuit and method for preventing system sh...
- Patent number 6,249,411
- Issue date Jun 19, 2001
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Switching controller and method for operating a flyback converter i...
- Patent number 6,188,588
- Issue date Feb 13, 2001
- International Business Machine Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Boost circuit which includes an additional winding for providing an...
- Patent number 6,181,114
- Issue date Jan 30, 2001
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Boost doubler circuit wherein an AC bridge rectifier is not required
- Patent number 6,160,724
- Issue date Dec 12, 2000
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Parallel power system which includes over voltage protection
- Patent number 6,160,386
- Issue date Dec 12, 2000
- International Business Machines Corporation
- William Hemena
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Current limiter responsive to changing parallel power supply capacity
- Patent number 6,157,555
- Issue date Dec 5, 2000
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Computer system having power supply primary sense to facilitate per...
- Patent number 6,081,752
- Issue date Jun 27, 2000
- International Business Machines Corporation
- Paul Harrison Benson
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
AC line stabilization circuitry for high power factor loads
- Patent number 5,561,596
- Issue date Oct 1, 1996
- International Business Machines Corporation
- William Hemena
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

Information Patent Application
Protection of EMC filter components due to failure of boost stage/c...
- Publication number 20070253134
- Publication date Nov 1, 2007
- Kevin R. Covi
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
CIRCUIT FOR AC ADAPTER TO REDUCE POWER DRAWN FROM AN AC POWER SOURCE
- Publication number 20030214822
- Publication date Nov 20, 2003
- International Business Machines Corporation
- RANDHIR S MALIK
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
Method and system for maintaining full power during a power interru...
- Publication number 20020153777
- Publication date Oct 24, 2002
- International Business Machines Corporation
- Cecil C. Dishman
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
ADAPTER CIRCUIT FOR SELECTIVELY DOUBLING INPUT VOLTAGE DEPENDING UP...
- Publication number 20020141211
- Publication date Oct 3, 2002
- Randhir Singh Malik
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
Power factor correction (PFC) circuit that eliminates an inrush cur...
- Publication number 20020101750
- Publication date Aug 1, 2002
- International Business Machines Corporation
- Randhir S. Malik
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...

William Hemena

Person

Patents Grantslast 30 patents

Circuit for AC adapter to reduce power drawn from an AC power source

Fail safe circuit with reset capability for a power supply

Integrated fan speed control and fault detection circuitry

Method and apparatus for using an energy reserve to provide voltage...

Method and system for maintaining full power during a power interru...

Resonant converter circuit

Failure detection of an isolation device with PFA signal generation...

High efficiency multiple input voltage sources power supply

Multiphase zero-volt-switching resonant DC-DC regulator

Power factor correction (PFC) circuit that eliminates an inrush cur...

Adapter circuit for selectively doubling input voltage depending up...

Power factor correction circuit

Circuit for limiting inrush current to a power source

High efficiency power converter with fast transient response

Multiple output power supply circuit

Dual forward power converter utilizing coupling capacitors for impr...

Fault tolerant active current sharing

Multiple output synchronous rectifier circuit providing zero volt s...

Over-voltage protection circuit and method for preventing system sh...

Switching controller and method for operating a flyback converter i...

Boost circuit which includes an additional winding for providing an...

Boost doubler circuit wherein an AC bridge rectifier is not required

Parallel power system which includes over voltage protection

Current limiter responsive to changing parallel power supply capacity

Computer system having power supply primary sense to facilitate per...

AC line stabilization circuitry for high power factor loads

Patents Applicationslast 30 patents

Protection of EMC filter components due to failure of boost stage/c...

CIRCUIT FOR AC ADAPTER TO REDUCE POWER DRAWN FROM AN AC POWER SOURCE

Method and system for maintaining full power during a power interru...

ADAPTER CIRCUIT FOR SELECTIVELY DOUBLING INPUT VOLTAGE DEPENDING UP...

Power factor correction (PFC) circuit that eliminates an inrush cur...