| 8232679 |
Uninterruptible power supplies with converter operation conditioned upon static switch commutation and methods of operation thereof |
Rennie Bobb, Paul Lukosius, John G. Tracy |
2012-07-31 |
| 7948778 |
Self-testing power supply apparatus, methods and computer program products |
Hans-Erik Pfitzer, Rune Lennart Jonsson, John G. Tracy, Miguel Chavez, Jason Scott Anderson |
2011-05-24 |
| 7638899 |
Nested redundant uninterruptible power supply apparatus and methods |
John G. Tracy |
2009-12-29 |
| 7502237 |
Power waveform harmonic analysis using summed samples |
Pratik Shirish Pratel |
2009-03-10 |
| 7405494 |
AC power supply apparatus, methods and computer program products using PWM synchronization |
Hans-Erik Pfitzer, Jason Scott Anderson, Michael Westerfield |
2008-07-29 |
| 7400066 |
Apparatus and methods for UPS bypass monitoring and control |
Jason Scott Anderson, Michael Westerfield |
2008-07-15 |
| 7247955 |
PWM power supplies using controlled feedback timing and methods of operating same |
John G. Tracy, Hans-Erik Pfitzer, Rennie Bobb, Julius Isaiah Rice |
2007-07-24 |
| 6629247 |
Methods, systems, and computer program products for communications in uninterruptible power supply systems using controller area networks |
Richard Hall, Miguel Chavez |
2003-09-30 |
| 6549440 |
AC power supply apparatus and methods providing output control based on estimated instantaneous reactive power |
Pasi Taimela |
2003-04-15 |
| 6201720 |
Apparatus and methods for space-vector domain control in uninterruptible power supplies |
John G. Tracy, Edward Akbari, Miguel Chavez |
2001-03-13 |
| 5745355 |
Wireless selective tripping of AC power systems connected in parallel |
John G. Tracy |
1998-04-28 |
| 5745356 |
Independent load sharing of AC power systems connected in parallel |
John G. Tracy |
1998-04-28 |
| 5633539 |
Uninterruptible power supply input power walk-in |
— |
1997-05-27 |