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| Number | Title | Issue Date |
| 7333349 | Single-stage buck-boost inverter An improved Single-Stage Buck-Boost inverter (S2B2 Inverter) is provided, using only three or four power semiconductor switches and two coupled inductors in a flyback arrangement. The inverter can handle a wide range of dc input voltages and pr... | 02/19/2008 |
| 7319199 | Fusible electric slide switch A fusible electric slide switch. A fuse carrier is slidably mounted to a base, and has a pair of recesses holding fuses. A cover captures the fuse carrier between itself and the base, and has a pair of through slots aligning with the pair of recesses when the fuse c... | 01/15/2008 |
| 7193496 | Magnetic element and power supply A magnetic element and a power supply which can output a plurality of different output pulse signal voltages or different output AC voltages while preventing an increase in the number of parts or an area occupied by parts are provided. The magnetic element includes ... | 03/20/2007 |
| 7042323 | Signal transformer and method for operating such a signal transformer A signal transformer having a primary limb and a first secondary limb is specified, a primary winding at least partly enclosing the primary limb and a secondary winding at least partly enclosing the first secondary limb and the primary limb being connected to the fi... | 05/09/2006 |
| 6954131 | Electrical reactor assembly having center taps An electrical reactor assembly and method of assembly is disclosed. The reactor is formed from a combination of a magnetic T-core and a pair of magnetic L-cores. A plurality of comb-like separators is placed over a vertical portion of the T-core. A wire, with a rect... | 10/11/2005 |
| 4926110 | Voltage switching device with plural fuses A novel voltage switching device operable under a first and a second source voltages is disclosed. The device, which is capable of converting one of the source voltages to the design voltage of an electrical appliance when the two are different, comprises... | 05/15/1990 |
| 4837497 | Variable transformer, reactor and method of their control A variable transformer, reactor having a core combining at least two complete core elements wiht a common yoke; primary winding divided into two independently fed sets of phase coils wound in opposite direction, arranged on symmetrical legs of core elemen... | 06/06/1989 |
| 4682080 | Discharge lamp operating device A discharge lamp operating device having a high frequency inverter is discharged. Connected to a secondary winding of an oscillation transformer of the high frequency inverter is a discharge current supply circuit having a switch for controlling supply of... | 07/21/1987 |
| 4678986 | Electric transformer with selectively energized modular circuits An electric transformer for supplying an adjustable electric magnitude, especially for regulating purposes, includes several modules having therebetween a binary progression relationship with respect to their power handling capabilities. Each module has a... | 07/07/1987 |
| 4665357 | Flat matrix transformer A flat matrix transformer or inductor is made of a plurality of interdependant magnetic circuits, arranged in a matrix, between and among which electrical conductors are interwired, the whole cooperating to behave as a transformer or inductor. The flat ma... | 05/12/1987 |
| 4441149 | Multi-voltage transformer input circuits with primary reactor voltage control A multi-voltage transformer input circuit, which may have multi-phase input, and where the input or each phase of the input has a primary reactor voltage control, is provided by the present invention. The primary winding of the transformer, or each phase ... | 04/03/1984 |
| 4431948 | Apparatus for control of load power consumption An apparatus for reducing the voltage applied to a load in an AC system utilizes an autotransformer and a relay or equivalent switching device between the common winding and the series winding. In each of the AC lines, the common winding and relay are con... | 02/14/1984 |
| 4339706 | Current controlling A generally figure-of-eight transformer core carries first, second and third toroidal windings spaced along its central leg and is formed with magnetic shunts across the gaps between central and outside legs in the planes between windings. A capacitor is ... | 07/13/1982 |
| 4292544 | Power control circuit A power control circuit is disclosed which may comprise a transformer having a primary winding and at least one secondary winding, a first and a second series circuit, and a rectifier circuit. The first series circuit may include a first DC power source, ... | 09/29/1981 |
| 4282417 | Method for controlling magnetizing current in multipulse resistant welding A method to control the welding transformer residual magnetizing current which normally continues circulating in the secondary circuit at the end of each welding pulse until the tips are opened. By utilizing a firing delay of the last half cycle in each w... | 08/04/1981 |
| 4169975 | Two-phase transformer and welding circuit therefor An apparatus for converting three-phase electrical energy into direct current includes Scott-connected transformers with oppositely biased SCRs connected in parallel to two of three input terminals. The SCRs are controlled so that they fire in alternate a... | 10/02/1979 |
