Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 7382115 | Apparatus for converting DC power and method of the same Embodiments according to the present invention can enhance an efficiency of an apparatus or method capable of converting power of a system. An apparatus for converting power includes a load state variation detector that detects a load characteristic state of the loa... | 06/03/2008 |
| 7356716 | System and method for automatic calibration of a reference voltage A system and system for automatic voltage calibration is presented. A voltage calibration system includes three main units, which are a voltage level trimming unit, a trim detection unit, and a trim control unit. The three units work in conjunction with each other d... | 04/08/2008 |
| 7355369 | On-load transformer tap changing system An on-load transformer tap changing system, for example for a power transformer, wherein the secondary or primary of a transformer includes at least one first tap and one second tap. A main connection circuit is used for permanent connection of the first tap or the ... | 04/08/2008 |
| 7310038 | Electromechanical device for selecting coil voltage and locking the coil in place A system for selecting coil voltage in an electrical device comprises a housing and a coil in the housing having a plurality of windings. Each winding has a pair of pins. A slider supports a plurality of moveable contacts and is moveably mounted in the housing proxi... | 12/18/2007 |
| 7286036 | Method for selecting coil voltage and locking the coil in place A system for selecting coil voltage in an electrical device comprises a housing and a coil in the housing having a plurality of windings. Each winding has a pair of pins. A slider supports a plurality of moveable contacts and is moveably mounted in the housing proxi... | 10/23/2007 |
| 7271692 | Slider for selecting coil voltage and locking the coil in place A system for selecting coil voltage in an electrical device comprises a housing and a coil in the housing having a plurality of windings. Each winding has a pair of pins. A slider supports a plurality of moveable contacts and is moveably mounted in the housing proxi... | 09/18/2007 |
| 7203931 | Programmable controller, and control-program-development supporting apparatus A programmable controller includes a universal microprocessor. This universal microprocessor incorporates an acceleration section. The control-program-development supporting apparatus generates an execution code directly executable by the universal microprocessor. T... | 04/10/2007 |
| 7193397 | Voltage converter A voltage converter includes a transformer circuit, a filter, and a controller. The transformer circuit is coupled to the filter, and the controller is coupled to the transformer circuit and the filter. The transformer circuit includes an input port and an autotrans... | 03/20/2007 |
| 7055439 | Interior contour for bore of a friction support bearing of a railway locomotive traction motor A contour or profile of a bore of a locomotive traction-motor support bearing structure, where such profile preserves the currently center-loading of the upper load zone but moves inboardly the lower load zone to a more general central location. The profile of the b... | 06/06/2006 |
| 7049765 | Transformer for dimmer switch or on/off switch and method of use The present invention achieves the above objects, among others, by providing, in a preferred embodiment, a transformer system for use with either a dimmer switch or an on/off switch, including: a transformer; a load connected to the transformer; a first tap connecte... | 05/23/2006 |
| 6924631 | Limiting ring current in short circuit between adjacent partial wingings by increasing leakage impedance Apparatus for regulating an electric voltage in at least one of electric supply networks and consumer units. The apparatus includes a regulating transformer arranged between a network node and at least one end consumer. The regulating transformer utilizes a primary ... | 08/02/2005 |
| 6762594 | Limiting ring current in short circuits between adjacent partial windings by increasing leakage impedance The invention relates to a method for regulating the electrical voltage in electrical supply networks and/or consumer units and a device for carrying out said method. A regulating transformer (3) is inserted between a network node (1) in the supply net... | 07/13/2004 |
| 6420856 | Versatile power flow transformers for compensating power flow in a transmission line A series-compensating power flow transformer implements power flow control in a transmission line of an n-phase power transmission system, where each phase of the power transmission system has a transmission voltage. The transformer has n primary windings... | 07/16/2002 |
| 6211602 | Actuator using electromechanical transducer capable of being used in high temperature and high humidity environment and apparatus having the same An actuator using an electromechanical transducer capable of maintaining stable driving function even under a severe environment of high temperature and/or high humidity, or the like, and an apparatus mounted with the actuator. The actuator are disclosed ... | 04/03/2001 |
| 6100673 | Voltage control device for increasing or decreasing voltage to a load A voltage control apparatus (10) selectively boosts or bucks an input voltage in order to provide a selected output voltage. In the preferred embodiment, the apparatus includes a transformer (T1) having a plurality of secondary voltages presented at respe... | 08/08/2000 |
| 6072305 | Electronic tap position indication system A system for indicating the position of a tap of a voltage regulator system. An electrical signal representing the tap position is converted to a digital format and provided to a processor which controls an electronic display. The display provides a graph... | 06/06/2000 |
| 6011704 | Auto-ranging power supply Autoranging power supply apparatus may comprise a power output section having a plurality of pairs of output terminals, each of which has a maximum voltage and current rating. A switching network associated with the power output section connects and disco... | 01/04/2000 |
| 5808454 | Alternating current power control device An alternating current power control device including a phase comparison controller for comparing a phase of an input voltage with that of a first reference voltage, a single-winding transformer for varying the input voltage, a mutual induction reactor fo... | 09/15/1998 |
| 5786552 | Switching arrangement for load change-over switches of step switches and for selector switches The invention concerns a switching arrangement for load change-over switches of step switches and for selector switches, wherein two switching contacts movable in two directions are present. The first switching contact is in the form of a main switching c... | 07/28/1998 |
| 5694034 | Tap changer for a tapped or stepped transformer A tap changing circuit has each tap of a power transformer connected with a selector vacuum switching cell. The odd numbered cells and the even numbered cells are connected to respective sides of a load switch each including a further vacuum switching cel... | 12/02/1997 |
| 5596263 | Electrical power distribution system apparatus-resident personality memory module An electrical apparatus (100) line actuator (102), such as a voltage regulator or circuit breaker, has resident therein a personality module, electronically reconfigurable memory device (126) which stores actuator operational information, such as specific... | 01/21/1997 |
| 5552696 | Multiple setpoint configuration in a voltage regulator controller A voltage regulator controller including means for creating multiple regulator setpoint configurations. Configurations can be selected upon demand, by time/date activation, or by an external trigger source.... | 09/03/1996 |
| 5550460 | Voltage regulator control system with multiple control programs A voltage regulator controller is provided with multiple control programs. At any given time, one of the control programs is selected to be "active" depending on the existing operating conditions. An operator (user) configures the voltage regulator contro... | 08/27/1996 |
| 5545974 | Variamp oil temperature control A voltage regulator controller of the types used with a multi-tap voltage regulator transformer having a plurality of tap positions for adjusting an output voltage in discrete tap position steps is provided with a number of control algorithms which are dy... | 08/13/1996 |
| 5523674 | Step switch The invention relates to a load selector for step switches in step transformers with two movable selector contacts. A suitable vacuum switch is located downstream of the first movable selector contact to switch the load current and a suitable switch for s... | 06/04/1996 |
| 5516992 | Transformer tap changing and step switch assembly A cast-resin transformer has a transformer housing, a plurality of windings each having a plurality of taps, respective contacts connected to the taps and mounted on the housing in respective arrays which are all identical, and respective identical mounti... | 05/14/1996 |
| 5498954 | Control system and method for the parallel operation of voltage regulators The invention is a system and method for changing the tap position of transformers, where two or more of the transformers are operating in parallel, based on the measured low side bus voltage and low side MVAR flow. A programmable logic controller (PLC) c... | 03/12/1996 |
| 5450002 | Co-controller for controlling an LTC transformer with a standard voltage regulator control A co-controller provides communication between a standard voltage regulator controller and an LTC transformer, to enable the standard controller to be used in the operation of the LTC transformer. The co-controller generally consists of an interface circu... | 09/12/1995 |
| 5283728 | Variable transformer with slidable contactor A voltage control system has a pair of clockwise and counterclockwise interleaved coils on a portion of a transformer core, the coils having multiple spaced turns providing sets of co-planar alternate electrical contact pairs extending linearly to form a ... | 02/01/1994 |
| 5136233 | Means and method for controlling elecrical transformer voltage regulating tapchangers An apparatus and method for controlling tapchanger operation on voltage regulating transformers includes a plurality of transducers to obtain real time voltage, wattage and reactive power readings, along with status readings for breakers associated with c... | 08/04/1992 |
| 5128605 | Monitoring system for step-type switching transformer A multiphase stepping transformer wherein a closed vacuum interrupter at each phase is opened before a respective stepping switch is advanced is controlled by continuously monitoring current flow through the interrupters. Before the interrupters are opene... | 07/07/1992 |
| 5107200 | Load switch for a step transformer A switching system for a step transformer having at least two adjacent taps and a pair of terminals shiftable between the taps has a pair of fixed contacts normally connected to the terminals, a vacuum interrupter connected between the terminals and displ... | 04/21/1992 |
| 5087872 | Circulating load apparatus A circulating load apparatus for loading a power supply. The power supply has a power input terminal, a power output terminal and a power return terminal. The power supply provides an output voltage at the power output terminal with respect to the power r... | 02/11/1992 |
| 5055766 | Voltage regulator compensation in power distribution circuits An electronic device for compensating voltage fluctuations in an electrical power distribution circuit controls operation of a transformer of the type having a TCUL voltage regulator by automatically calculating the voltage bandwidth of the transformer ba... | 10/08/1991 |
| 4986160 | Burst firing electromagnetic launcher utilizing variable inductance coils An electromagnetic projectile launching system is provided with a pair of conductive projectile launching rails which are connected to a high current inductive power source. Current from an inductive energy storage coil is switched to the launcher rails t... | 01/22/1991 |
| 4933624 | Electric power supply with controllable voltage boost To increase the output voltage of a conventional rectifier bridge, one winding of an autotransformer is connected across a pair of a-c input terminals of the bridge through a thyristor which is turned on only when an output voltage increase is desired, an... | 06/12/1990 |
| 4904923 | Current amplifying device Disclosed is a reversible inductive energy transfer device for use where efficient transfer of energy between inductors is required. The apparatus is a current amplifying device which utilizes an energy storage inductor which comprises a plurality of seri... | 02/27/1990 |
| 4896092 | Voltage regulator for AC single phase and three phase systems A voltage regulator for AC single phase and three phase systems. An output voltage is controlled by controlling a preset stepped addition to or subtraction from the input voltage. The controlled addition or subtraction is performed by a series injection t... | 01/23/1990 |
| 4775766 | Tapped transformer/switch assembly A power selector assembly for a loudspeaker includes in one embodiment an audio transformer upon which a printed circuit board (PCB) is mounted via connector strips having pins for both securing the PCB to the transformer, and for individually electricall... | 10/04/1988 |
| 4694241 | Transformer tap changer One of a plurality of taps of at least one transformer is selected by choosing a predetermined plug to mate with a predetermined jack. The connection arrangement between each transformer and a corresponding jack is such that each pin of a respective jack ... | 09/15/1987 |
