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"I hate what they've done to my child...I would never let my own children watch it. "
Vladimir Zworykin, television pioneer ; Talking about an invention in which he played a critical role.
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| Number | Title | Issue Date |
| 7368836 | Volt-second synchronization for magnetic loads A method and device for connecting a load to an AC power source is arranged to ensure that the volt-second ratings of magnetic devices in the load are not exceeded, in order to limit in-rush currents resulting from saturation of the magnetic devices. In the case whe... | 05/06/2008 |
| 7291986 | Step sinusoidal voltage controlling method for hid, flourescent and incandescent light dimming applications A step voltage controlling device and method for High Intensity Discharge (HID) light dimming applications includes an autotransformer, voltage sensing block, current sensing block, pulse forming block, microprocessor control unit (MCU) block and plural three switch... | 11/06/2007 |
| 7095597 | Distributed static var compensation (DSVC) system for wind and water turbine applications A power generating system wherein a variable speed turbine is mounted on top of a tower or tethered underwater. The reactive component of turbine generated electrical power is corrected automatically through electronic switched power-factor capacitor banks that are ... | 08/22/2006 |
| 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 |
| 6856122 | Thyristor tap changer A thyristor transformer has a mechanical tap selector and a diverter switch with thyristors. The tap selector is mounted in the oil-filled housing or tank of the transformer and the diverter switch is mounted in a separate housing laterally attached to the tank.... | 02/15/2005 |
| 6841976 | Multi-line power flow transformer for compensating power flow among transmission lines A multi-line power flow transformer implements power flow control among multiple transmission lines in an n-phase power system. The transformer has an exciter unit with n primary windings. Each primary winding is on a core and receives a transmission voltage of a re... | 01/11/2005 |
| 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 |
| 6664771 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 12/16/2003 |
| 6486641 | Power regulation of electrical loads to provide reduction in power consumption A power regulation system is coupled to an AC power source outputting an input voltage. The system has a first transformer to receive the input voltage and generate a control voltage. The system also has a second transformer that has a primary coil and a ... | 11/26/2002 |
| 6396248 | Versatile power flow transformers for compensating power flow in a transmission line A 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 secondary windings, where each secon... | 05/28/2002 |
| 6384581 | Versatile power flow transformers for compensating power flow in a transmission line A limited-angle 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, wher... | 05/07/2002 |
| 5990667 | Regulator with asymmetrical voltage increase/decrease capability for utility system A regulator is provided for establishing asymmetrical voltage increase/decrease capability between an input node and an output node for enhanced regulation of either a voltage sag or a voltage swell within a utility system. The regulator includes an autot... | 11/23/1999 |
| 5969511 | Method and device for continuous adjustment and regulation of transformer turns ratio, and transformer provided with such device In a method and a device for continuously adjusting, within a certain adjustment range, the turns ratio between the primary winding and the secondary winding of a power transformer provided with at least one regulating winding, a first tap is switched on ... | 10/19/1999 |
| 5786684 | Apparatus and methods for minimizing over voltage in a voltage regulator A solid state voltage regulator and methods therefore are shown to include a transformer having a secondary coil, the secondary coil having a plurality of taps. A first solid state switch is connected between the regulator output and a first tap. The firs... | 07/28/1998 |
| 5654627 | Method of automatically changing upper, balanced and lower voltage in electric power saving transformer and the device of the same In an autotransformer of a single-phase three-wire system or a single-phase two-wire system, plural sets of main coils connected with input terminals are phase-wound on a single-phase core-type core, and further, between the ends of the main coils, plural... | 08/05/1997 |
| 5604423 | Tap changing system having discrete cycle modulation and fault rotation for coupling to an inductive device A tap changing system for operation with a transformer and featuring a special group of gate-controlled electronic devices that operate as a circuit breaker and recloser such that, after half-cycle of short-circuit current, said special group is transferr... | 02/18/1997 |
| 5498915 | Electronically switched power receptacle A power switching circuit selectively connects an electrical load having first and second input connections to any one of a plurality of branch power circuits. Each branch circuit includes a first and second conductor defining a relative voltage therebetw... | 03/12/1996 |
| 5461671 | Telephone line power utility circuit A telephone line power utility circuit, in which direct-current power supplied through a telephone line-side is utilized as a power source for a line terminal device having a direct-current resistance, the telephone line power utility circuit including a ... | 10/24/1995 |
| 5455505 | Removable field programmable data memory storage module A controller for a line regulation device such as a voltage regulator is provided with an interface to a removable memory module. The memory module is preferably of the memory card type which can be carried by a field engineer in a clothing pocket. When t... | 10/03/1995 |
| 5408171 | Combined solid-state and mechanically-switched transformer tap-changer Disclosed is an End-Turn Solid-State Switching (ETSS) transfomer tap which makes use of a high-speed solid-state switching network to select either the end-turn lead or one of a number of non-isolated taps on a transformer regulating winding, and connects... | 04/18/1995 |
| 5289110 | Input current responsive, tap changing transformer system A system for providing a constant current to airport or airfield signs is disclosed. The system receives input currents of varying amperages which also supply, and allow dimming of, runway or taxiway lights. According to various exemplary embodiments of t... | 02/22/1994 |
| 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 |
| 5119012 | AC power regulator with tap changer An AC power regulator having a tap changer. The regulator comprises a transformer having taps and thyristors connected with the taps, respectively. The regulator further includes rectifiers, comparators having hysteresis and comparing the output signals f... | 06/02/1992 |
| 5075617 | Automatic line drop compensator An electronic system connected to a power transmission line having a fluctuating load for automatically providing increments of voltage to the line to supplement voltage losses from the load by sequentially connecting tapes on the windings of a transforme... | 12/24/1991 |
| 5006784 | Thyristor on-load change-over switch The invention relates to an arrangement in an on-load change-over switch of an on-load tap changer for uninterrupted switch-over of the regulating winding of a transformer. On-load change-over switching is usually accomplished using mechanical switching e... | 04/09/1991 |
| 4888545 | Improved tap switching power supply Described is a novel power supply for generating a constant d.c. voltage from a variable a.c. voltage supply line. The power supply includes a plurality of switch circuits which monitor voltage levels on respective secondary windings of a power transforme... | 12/19/1989 |
| 4853608 | AC voltage regulator An AC voltage regulator includes a transformer arrangement having a plurality of taps so that an input line voltage is passed to an output line with the output line voltage being determined by the nominal value of the input line voltage together with an a... | 08/01/1989 |
| 4748341 | Uninterruptible power supply An uninterruptible power supply comprising a regulating transformer including output circuitry for connection to a load, first input circuitry for coupling a reserve AC voltage source to the regulating transformer and second input circuitry for coupling a... | 05/31/1988 |
| 4733158 | Control circuit for tap-switching power supplies and multi-tap transformers A tap-switching circuit for automatically controlling the output voltage of a multi-tap transformer in response to a varying input line voltage and/or system load current demand, includes voltage sensing circuitry in parallel with both the transformer vol... | 03/22/1988 |
| 4714870 | Arrangement for controlling an A.C. voltage An arrangement for controlling an A.C. voltage supplied to a load, such as a fluorescent lamp emitting germicidal ultraviolet radiation in a water-purifying apparatus. The load is connected to the secondary winding of a transformer, the primary winding of... | 12/22/1987 |
| 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 |
| 4639662 | Thyristor circuit for current regulation A thyristor circuit including a primary winding and at least one secondary winding and first and second bipolar thyristor switches connected across respective connections of the secondary winding. The first bipolar thyristor switch bridges N1 t... | 01/27/1987 |
| 4622513 | Gating of the thyristors in an arcless tap changing regulator A voltage regulator using electronic control of two static switch circuits to permit tap changing without arcing at the switched electrical contacts, without interrupting the load current, and without inducing sizable circulating currents. As a mechanical... | 11/11/1986 |
| 4571499 | Circuit arrangement for switchover of load between different sources of alternating voltage Two sources of alternating current, such as taps of a supply transformer, e selectively switchable across a load by means of two circuit branches each provided with a main switch and a collateral network in parallel therewith, this network comprising a se... | 02/18/1986 |
| 4562338 | Heating power supply apparatus for polycrystalline semiconductor rods A heating power supply apparatus for polycrystalline semiconductor rods, including a power transformer and anti-parallel thyristor unit groups connected to respective portions of the secondary of the power transformer, balance transformer groups connected... | 12/31/1985 |
| 4550285 | Load-switching circuit for antiparallel thyristor networks and a tapped transformer A load-switching circuit for a tapped transformer utilizes identical netws of antiparallel thyristors bridged by commutating networks having a condenser in series with a damping impedance. According to the invention, the blocking of one pair of thyristor... | 10/29/1985 |
| 4388579 | Control system for a wound-rotor motor A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transfor... | 06/14/1983 |
| 4363060 | Arcless tap changer for voltage regulator A tap changer voltage regulator permits a tap changer selector contact to engage an open circuited new tap without arcing and has a half-tap voltage auxiliary winding which permits halving the inter-tap voltage to thus double the number of steps, and an a... | 12/07/1982 |
| 4301489 | Arcless tap changer utilizing static switching A tap changer voltage regulator permits a tap changer switch selector contact to engage an open-circuited new tap without arcing and has a half-tap voltage auxiliary winding which permits halving the inter-tap voltage and doubling the number of steps, and... | 11/17/1981 |
