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| Number | Title | Issue Date |
| 7558032 | Protection system for medium-voltage potential transformers A protection system for a transformer system that includes three single phase transformers with auxiliary secondary windings, respectively. The auxiliary secondary windings are connected to form an open delta configuration. The protection system is connected into th... | 07/07/2009 |
| 7535685 | Radio frequency signal coupler, coupling system and method A radio frequency (RF) signal coupling system, comprising a shunt device and a coupling unit for cooperative engagement with a MV power network and an RF modem. The shunt device has a high voltage terminal connected to an electrical cable of the power network and a ... | 05/19/2009 |
| 7423853 | Aluminum wound transformer An iron core transformer with at least one primary winding and at least one secondary winding of which at least one of the windings are wound with aluminum wire is disclosed for use in relatively low power applications, for example 5 kVa or below. The primary and se... | 09/09/2008 |
| 7414331 | Power converter system and method A power system for supplying power to a load is provided. The power system comprises a converter system comprising a first converter and a second converter and configured for operating in a first mode and a second mode. The first converter and the second converter a... | 08/19/2008 |
| 7372688 | Protection devices and methods for preventing the flow of undesirable differential mode transients A differential mode surge protection apparatus includes first and second solid state protection devices in series between respective input and output connection points. The apparatus may be provided in conjunction with a common mode protection apparatus such as an i... | 05/13/2008 |
| 7365451 | Power converter A power converter that can continue to operate after suffering a partial failure. The power converter includes multiple array transformers; normally-on switches connected respectively in series with the ends of each of the primary windings of the array transformers;... | 04/29/2008 |
| 7317598 | Electric transformer explosion prevention device A device for preventing the explosion of an electric transformer equipped with a tank filled with combustible coolant fluid, includes a pressure relief element to decompress the tank, a reservoir arranged downstream of the pressure relief element and at least one st... | 01/08/2008 |
| 7309837 | Wildlife guard for electrical power distribution and substation facilities The present disclosure provides a wildlife guard for electrical power equipment including a disc having a central opening for fitting onto the equipment. The disc includes an electrically insulating material with a conductive filler material in quantity sufficient f... | 12/18/2007 |
| 7304857 | Sensor node and circuit board arrangement An electronic circuit, preferable as a sensor node, has a highly sensitive radio function and is capable of performing a low-power-consumption operation. The electronic device has a board; a connector for connecting a sensor; a first signal processor circuit receivi... | 12/04/2007 |
| 7294973 | Discharge tube lighting apparatus, light source apparatus, and display apparatus A discharge tube lighting apparatus is used to drive a plurality of discharge tubes. The apparatus includes a balance coil having a winding input end and a plurality of winding output ends to which the discharge tubes are connected individually; a power section for ... | 11/13/2007 |
| 7250726 | Systems and methods for a transformer configuration with a tree topology for current balancing in gas discharge lamps An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. Embodiments ... | 07/31/2007 |
| 7245896 | Apparatus for improving reception sensitivity of public wave receiver by reducing noise externally-emitted in the public wave receiver An apparatus for improving reception sensitivity of a public wave receiver includes power devices formed in a power supply of the public wave receiver, and a shielding plate for shielding noise generated by the power devices. A signal line for connecting an antenna ... | 07/17/2007 |
| 7199988 | Discharge tube lighting transformer with protective circuit against non-grounding of ground terminal An arrangement is made in a transformer such that voltages induced on the opposite sides of a mid-point 17 of a secondary winding 16 are unbalanced by an amount on the order of 5%. When a ground terminal 18 is not grounded while a mid-point of a... | 04/03/2007 |
| 7184252 | Surge protector with input transformer A surge protector for alternating current service includes at least an incoming hot line and a neutral line, but usually includes an incoming hot line, an incoming neutral line and a safety ground line. The surge protector has an input transformer and a series conne... | 02/27/2007 |
| 7176778 | Magnetic core assembly having bobbin and mounting board thereof A magnetic core assembly with coils therein has a substantially spherical or ellipsoidal main body defining a hollow space therein. A column is disposed in the main body so as to be aligned with a center line of the main body. The main body is defined by a pair of s... | 02/13/2007 |
| 7154061 | Interrupter assembly for a circuit breaker A preferred embodiment of an interrupter assembly for a circuit breaker includes a first contact, a conductor, and a second contact mounted on the conductor. The second contact and the conductor are movable in relation to the first contact between a first position w... | 12/26/2006 |
| 7145760 | Tap changer monitoring A method and means for diagnosing transformer tap changers is provided. Pressure is monitored in an insulating liquid of a tap changer for a period of time in which switching of the tap changer is carried through. Switching-related information is extracted from the ... | 12/05/2006 |
| 7088055 | High efficiency controller of a gas-filled light emitting tube The present invention relates to a high-efficiency controller of a gas-filled light producing tube; the controller can produce signals in a form of outputs of high-frequency sine wave to soft-start a gas-filled light producing tube according to the principle of modu... | 08/08/2006 |
| 7075163 | Electromagnetic noise suppressor, semiconductor device using the same, and method of manufacturing the same In a semiconductor bare chip (57) on the front surface whereof is formed an integrated circuit, a magnetic loss film 55 is formed on the back surface of that semiconductor bare chip. ... | 07/11/2006 |
| 7068487 | Surge protector A surge protector for alternating current service includes at least an incoming hot line and a neutral line, but usually includes an incoming hot line, an incoming neutral line and a safety ground line. The surge protector has a series connected transformer with inp... | 06/27/2006 |
| 7046492 | Power transformer/inductor A power transformer/inductor includes at least one winding. The winding is made of a high voltage cable that includes an electric conductor, and around the electric conductor is arranged a first semiconducting layer, around the first semiconducting layer is an insul... | 05/16/2006 |
| 7040383 | Telecommunication device including a housing having improved heat conductivity A telecommunication device includes a housing formed by gas-assist injection molding and having an inner wall, outer wall and a hollow space formed therebetween and receiving therein gas refrigerant. The hollow space has a plurality of vertical channels wherein the ... | 05/09/2006 |
| 6992871 | Microtransformer for system-on-chip power supply A microtransformer for a high-performance system-on-chip power supply is disclosed. Through-wafer openings in a substrate allow the primary and secondary wiring on both surfaces of the silicon substrate. An insulating silicon oxide layer is first deposited on all su... | 01/31/2006 |
| 6992874 | Dual stage current limiting surge protector system A dual stage current limiting surge protector system for protecting telecommunications equipment from power and surge transients is provided. The surge protector system includes a voltage suppressor having first and second ends operatively coupled between input tip ... | 01/31/2006 |
| 6972686 | Radiated field detector A testing device is operative to sense or monitor a radiated field emitted by an igniter for heating equipment such as an oil burner and to indicate the detection corresponding to a normal operating state of the igniter. ... | 12/06/2005 |
| 6958894 | Relaying method for protecting a transformer using a difference of current Disclosed is a relaying method for protecting a transformer by using a difference of current. A decision function, related to the rate of change of a primary current, a secondary current, or a differential current, is used for determining whether a detected abnormal... | 10/25/2005 |
| 6954345 | Generator for producing high voltages A generator for producing high voltages and having at least one generator winding (12) is connected via a generator circuit (10) to a network (19), which generator circuit has means (15, . . . , 17) for protection against overvoltages. Im... | 10/11/2005 |
| 6950291 | Electromagnetic interference shielding for small magnetic devices The present invention provides magnetic structure, particularly an isolation transformer, which includes a shield to prevent radiation of electromagnetic interference (“EMI”). The magnetic structure includes a support structure, or bobbin, on which are mounted w... | 09/27/2005 |
| 6950295 | Method and apparatus for balancing capacitance in hybrid overvoltage protection device Metal oxide varistors (MOVs) are employed in surge protection devices, such as overvoltage protection devices, between a pair of signal lines and ground to reduce the capacitive imbalance introduced by the overvoltage protector, thereby improving higher frequency tr... | 09/27/2005 |
| 6906609 | Planar transformer A transformer having at least one primary winding and one secondary winding. The windings are disposed between walls of a first and second bobbin member. In preferred eombodiments, the creepage distance between the windings can be increased by providing a flange on ... | 06/14/2005 |
| 6903910 | Shielded enclosure with user-installable interface modules An RF shielded enclosure that is configurable for a variety of testing requirements, yet still maintain proper RF isolation. User-installable modules that are specialized for the desired interface, ventilation or monitoring use can be installed on the enclosure to a... | 06/07/2005 |
| 6839207 | Protection system for protecting a poly-phase distribution transformer insulated in a liquid dielectric, the system including at least one phase disconnector switch The distribution transformer is installed in a station having N phases, at least N-1 phases being equipped on the high-voltage side of the transformer with respective current-limiting fuses capable of blowing in the event of a dead short circuit between the phases. ... | 01/04/2005 |
| 6804092 | Device for prevention against explosion of electrical transformers Device for prevention against explosion of an electrical transformer comprising an enclosure filled with combustible coolant, and a means for decompressing the enclosure of the transformer. The decompression means comprises a rupture element 1 with integrated... | 10/12/2004 |
| 6788510 | High voltage transformer module and receptacle A high voltage electrical device includes a removable transformer module and a receptacle attached to the high voltage electrical device for receiving the removable transformer module. The removable transformer module is configured to mate with the receptacle as the... | 09/07/2004 |
| 6738240 | Microtransformer for system-on-chip power supply A microtransformer for a high-performance system-on-chip power supply is disclosed. Through-wafer openings in a substrate allow the primary and secondary wiring on both surfaces of the silicon substrate. An insulating silicon oxide layer is first deposited on all su... | 05/18/2004 |
| 6731481 | Relaying method for protecting transformers The present invention relates to a relaying method using the ratio of induced voltages or the ratio of flux linkage increments. The protective relaying method for power transformers with one or more phases includes the first step of obtaining primary and secondary v... | 05/04/2004 |
| 6630799 | Resonant power supply and apparatus for producing vacuum arc discharges The present invention relates to a vacuum arc discharge power supply. The power supply may be a high frequency resonant AC supply or it may be rectified to give resonant DC. The power supply of the present invention may be used in x-ray production, vacuum... | 10/07/2003 |
| 6618231 | Neon sign transformer module and receptacle A neon sign includes a removable transformer module and a receptacle attached to the neon sign for receiving the removable transformer module. The removable transformer module is configured to mate with the receptacle as the removable transformer module i... | 09/09/2003 |
| 6605908 | Stopper protection circuit of electronic ballast for fluorescent lamp A (vibration) stopper protection circuit of an electronic ballast for fluorescent lamps. The electronic ballast has an inverter to convert a direct current source into a square-wave source, and to provide the square-wave source to multiple lamp tubes. The... | 08/12/2003 |
| 6567249 | Transformer with electrical isolation protection and power supply unit or voltage converter with a transformer of this type A invention relates to a transformer having a primary coil and a secondary coil, with a ferromagnetic core inserted in a coil former. The alternating current resistance of the primary coil (3) drops on reaching a triggering temperature (TC) which lies abo... | 05/20/2003 |
