Inventor
HEMENA WILLIAM
US26 patents
Patents
26 patentsUS6487098B2Nov 26, 2002
Power factor correction (PFC) circuit that eliminates an inrush current limit circuit
IBM85 citations98
US6445165B1Sep 3, 2002
Circuit for limiting inrush current to a power source
IBM53 citations96
US6320771B1Nov 20, 2001
Fault tolerant active current sharing
IBM56 citations96
US6249411B1Jun 19, 2001
Over-voltage protection circuit and method for preventing system shutdown in a power system employing multiple power supplies
IBM54 citations96
US6487095B1Nov 26, 2002
Multiphase zero-volt-switching resonant DC-DC regulator
IBM105 citations95
US6081752AJun 27, 2000
Computer system having power supply primary sense to facilitate performance of tasks at power off
IBM91 citations95
US6181114B1Jan 30, 2001
Boost circuit which includes an additional winding for providing an auxiliary output voltage
IBM71 citations94
US6697955B1Feb 24, 2004
Method and apparatus for using an energy reserve to provide voltage to a power factor correction circuit in the event of a power interuption
IBM31 citations93
US6434026B1Aug 13, 2002
Multiple output power supply circuit
IBM19 citations93
US6188588B1Feb 13, 2001
Switching controller and method for operating a flyback converter in a critically continuous conduction mode
IBM52 citations93
US6157555ADec 5, 2000
Current limiter responsive to changing parallel power supply capacity
IBM34 citations93
US5561596AOct 1, 1996
AC line stabilization circuitry for high power factor loads
IBM35 citations93
US6297970B2Oct 2, 2001
Multiple output synchronous rectifier circuit providing zero volt switch mode operation
IBM37 citations92
US6865094B2Mar 8, 2005
Circuit for AC adapter to reduce power drawn from an AC power source
IBM28 citations91
US6160386ADec 12, 2000
Parallel power system which includes over voltage protection
IBM28 citations91
US6160724ADec 12, 2000
Boost doubler circuit wherein an AC bridge rectifier is not required
IBM31 citations91
US6522190B1Feb 18, 2003
High efficiency multiple input voltage sources power supply
IBM52 citations89
US6400582B1Jun 4, 2002
Dual forward power converter utilizing coupling capacitors for improved efficiency
IBM19 citations89
US6747424B1Jun 8, 2004
Integrated fan speed control and fault detection circuitry
IBM16 citations84
US6621718B1Sep 16, 2003
Resonant converter circuit
IBM15 citations84
US6448744B1Sep 10, 2002
Power factor correction circuit
IBM17 citations84
US6850396B1Feb 1, 2005
Fail safe circuit with reset capability for a power supply
IBM15 citations82
US6442052B1Aug 27, 2002
High efficiency power converter with fast transient response
IBM18 citations80
US6615146B1Sep 2, 2003
Failure detection of an isolation device with PFA signal generation in a redundant power supply system
IBM9 citations71
US6621180B2Sep 16, 2003
Method and system for maintaining full power during a power interruption in a multiple power supply system
IBM6 citations62
US6459603B1Oct 1, 2002
Adapter circuit for selectively doubling input voltage depending upon connector type
IBM0 citations52