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| Number | Title | Issue Date |
| 7474188 | 40° phase-shifting autotransformer The invention relates to an autotransformer for transforming a three-phase power supply into a nine-phase power supply, notably for use in a rectifier. The autotransformer is a, step-up or step-down transformer. For a step-down application, the three-phase input ter... | 01/06/2009 |
| 7274280 | Nine-phase step-up/step-down autotransformer An irregular polygon connection of a three-phase autotransformer using only five windings per phase provides a source of nine-phase power suitable for an 18-pulse AC to DC power converter. The windings are connected in a manner to limit the amount of third harmonic ... | 09/25/2007 |
| 7049921 | Auto-transformer for use with multiple pulse rectifiers Zig-zag connected, phase shifting, auto-transformers that provides the inherent ability to block the flow of zero sequence currents that are associated with multiple-pulse rectifiers. The transformer coils are wound in three separate, multi-wound windings on three s... | 05/23/2006 |
| 7023675 | Power supply for measuring the line impedance of underground cable Disclosed is a power supply for measuring the line impedance of an underground cable, which includes an input terminal section having a plurality of input terminals, a plurality of autotransformers, a transformer adjustment tap, a plurality of 3rd-harmonics cancella... | 04/04/2006 |
| 6995993 | Rectification system for improving power quality of electrical power systems A system and method for an autotransformer configuration including a plurality of windings which can be used to provide a substantial reduction in harmonics. The autotransformer includes a series of wye windings configured to provide a constant length voltage vector... | 02/07/2006 |
| 6861936 | Autotransformer-based system and method of current harmonics reduction in a circuit A system and method for reducing harmonics in a circuit is disclosed. The system comprises a main rectifier, ( n 3 - 1 ) ... | 03/01/2005 |
| 6664881 | Efficient, low leakage inductance, multi-tap, RF transformer and method of making same A low leakage inductance, versatile RF transformer with multiple input/output voltage ratios. The transformer has many applications. For example, and not by way of limitation, the transformer can be used with switching power supplies, RF induction power s... | 12/16/2003 |
| 5497052 | Isolated constant wattage lamp ballast A constant wattage ballast transformer of the isolated type permitting the electrical grounding of a mounting shell of the lamp it powers in which a primary, secondary and auxiliary winding are provided with the primary winding inducing voltage into the a... | 03/05/1996 |
| 5449991 | Motor control system and apparatus for providing desired three-phase voltage therein using a main transformer energized through an autotransformer A motor control system and apparatus for providing a desired three-phase voltage in the motor control system include: (1) a main transformer and components that are rated for one nominal voltage input, and (2) a commonly housed input transformer that tran... | 09/12/1995 |
| 5008801 | VSCF power conversion system using an output autotransformer Prior VSCF inverters have utilized relatively expensive bipolar transistors and associated base drive circuits together with an input autotransformer which unduly add to the cost and weight of the system. In order ot overcome these problems, a VSCF power ... | 04/16/1991 |
| 4906859 | Power supply circuit with symmetrically tapped auto-transformer An auto-transformer has first and second input terminals and first, second and third output terminals, the second output terminal being connected to a center tap of a coil and the first and third output terminals being connected to such points of the coil... | 03/06/1990 |
| 4794359 | Variable transformer A variable transformer comprising an annular core with a winding which at the end surface of the core is provided with a circular contact path to be connected with a current brush mounted on a rotor (7). The current brush consists of a contact roller jour... | 12/27/1988 |
| 4309651 | Wide range voltage regulator circuit A wide range voltage regulator circuit exhibiting minimum circuit impedance at maximum output voltage employs a pair of regulating windings in series having their movable contact controlled by a plurality of normally open and normally closed limit switche... | 01/05/1982 |
| 4023090 | Zagreb electrical circuit In an electrical three phase variable power supply fed by three phase alternating power and having a three coil adjustable autotransformer connected in wye across the power lines, the autotransformer having taps associated with each of its coils for adjus... | 05/10/1977 |
