Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 8174203 | Lamp driving circuit A lamp driving circuit includes a first printed circuit board and a second printed circuit board. The first printed circuit board includes a switching unit for switching an input power source, a control unit for controlling the switching unit, an inverter transforme... | 05/08/2012 |
| 7843143 | Apparatus for driving lamps and liquid crystal display having the same An apparatus for driving lamps and a liquid crystal display having the same, wherein the uniformity of luminance among lamps is improved, includes a main transformer unit for supplying a driving voltage to the lamps, and a balance transformer unit for making a lamp ... | 11/30/2010 |
| 7436124 | Voltage fed inverter for fluorescent lamps A ballast operates lamps each including a pair of electrodes. A high frequency resonant circuit generates a high frequency bus, the resonant circuit is configured for operational coupling to the electrodes of each lamp, and includes a resonant inductor and a resonan... | 10/14/2008 |
| 7402959 | Phase sampling protection device A phase sampling protection device substantially includes a phase sampling circuit coupled between a tube circuit and a protection circuit. The phase sampling circuit captures a voltage signal and a current phase signal of the tube circuit for comparison, using phas... | 07/22/2008 |
| 7402957 | Inverter circuit, backlight assembly, and liquid crystal display with backlight assembly In an inverter circuit, inverter transformers supply AC voltage to discharge tubes. The inverter transformers are arranged such that the AC voltage at a respective first terminal of each secondary coil has an opposite polarity with respect to a corresponding second ... | 07/22/2008 |
| 7385358 | Power supply circuit and transformer thereof A power supply circuit for a first and a second lamps and the transformer thereof is provided. The power supply circuit comprises a driving circuit and a transformer. The transformer includes a magnetic core, a primary coil set, a secondary coil, a first coil and a ... | 06/10/2008 |
| 7365501 | Inverter transformer An inverter transformer includes a coil unit including a bobbin and a plurality of windings, and a transformer core unit. The bobbin is formed with a core-receiving compartment, and includes first, second and third coil winding portions. The windings are wound aroun... | 04/29/2008 |
| 7330342 | Safety tester having a high-voltage switching relay protected by an in-line electronic circuit breaker A multiple function safety compliance test instrument includes a high voltage output switching relay protected by a solid state in-line circuit breaker. ... | 02/12/2008 |
| 7315130 | Switching control for inverter startup and shutdown An electronic ballast circuit for a lamp is described, wherein the ballast comprises a power factor correction circuit coupled to an inverter circuit. The inverter circuit is further coupled to a trigger circuit, which is in turn operatively connected to a hot or ne... | 01/01/2008 |
| 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 |
| 7274156 | Power supply circuit and transformer thereof A power supply circuit for a first and a second lamps and the transformer thereof is provided. The power supply circuit comprises a driving circuit and a transformer. The transformer includes a magnetic core, a primary coil set, a secondary coil, a first coil and a ... | 09/25/2007 |
| 7274153 | Portable fluorescent drop-light A hand-held fluorescent lamp assembly powered by typical line supply of 120 VAC, 60 Hz via an attached power cord and employing multiple commonly available fluorescent lamps. The assembly includes switches to independently control the multiple fluorescent lamps. The... | 09/25/2007 |
| 7242151 | Multiple lamp balance transformer and drive circuit The invention describes a multiple lamp balance transformer and a drive circuit. The multiple lamp balance transformer has two magnetic cores with a closed magnetic flux path and two coils wound around the closed magnetic flux path. The two coils have the same numbe... | 07/10/2007 |
| 7239092 | Limited open circuit voltage ballast A lighting system employs a pair of ballast input stages (21) operable to oscillate at different oscillating frequency (f1, f2) upon an initial powering of the ballast input stages (21). The lighting system further employs a pair of balla... | 07/03/2007 |
| 7180249 | Switching element driving circuit and discharge lamp lighting apparatus Switching elements S1, S2 connected in series are provided on the secondary side of a pulse transformer T to which an input voltage is supplied from a DC power supply E. On the primary side of the pulse transformer T, switching element S3, S4... | 02/20/2007 |
| 7161307 | Power factor correction apparatus with embedded DC—DC converter A power factor correction apparatus with an embedded direct-current to direct-current (DC-DC) converter is provided. The apparatus includes a power factor controller, a high-voltage adapter and a low-voltage adapter. The power factor controller, which receives an AC... | 01/09/2007 |
| 7154233 | Converter circuit with coupled inductances having asymmetrical air gap arrangement The invention relates to a converter circuit with coupled inductances L1 and L2 which have a core K having an air gap S which is asymmetrical with respect to the inductances. ... | 12/26/2006 |
| 7148781 | Landscape lighting transformer having increased loading features A transformer for low-voltage applications such as landscape lighting, comprising a primary winding and a secondary winding inductively coupled to the primary winding, the primary winding adapted to be energized with a high voltage and the secondary winding adapted ... | 12/12/2006 |
| 7132918 | Inductive coil assembly An inductive coil assembly having multiple coils arranged at distinct orientations to provide efficient inductive coupling of power or communications or both to a device when the device is arranged at different orientations with respect to the inductive primary coil... | 11/07/2006 |
| 7075249 | Arrangement in connection with a coupling device of a fluorescent lamp An arrangement in connection with a coupling device of a fluorescent lamp, the coupling device comprising a supply transformer, whose secondary is coupled in parallel with a fluorescent tube, the arrangement comprising an indicator circuit configured to indicate the... | 07/11/2006 |
| 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 |
| 7045970 | Electronic ballast for a lamp to be operated with iterative voltage pulses The invention relates to an electronic ballast for a dielectrically impeded discharge lamp (L), which ballast has an inductor (W1, W2, W3) with a winding (W2) that can be short-circuited. ... | 05/16/2006 |
| 7019467 | Thermally-protected ballast for high-intensity-discharge lamps A ballast for electrical lighting fixtures with improved thermal protection features has ballast laminations, primary and secondary coils, and a thermal protector, the thermal protector being wired in series with the secondary coil. The ballast preferably is of the ... | 03/28/2006 |
| 7002320 | Power factor correction circuit with a coil The switched-mode power supply according to the invention has a power factor correction circuit, which operates on the principle of a current pump and has a first coil for damping voltage spikes, as well as a second coil for power factor correction. The two inductan... | 02/21/2006 |
| 7002304 | Multi-lamp drive device A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound aroun... | 02/21/2006 |
| 6940233 | Method and system of driving a CCFL To efficiently and cost-effectively produce a light source, a CCFL circuit can include a PMOS transistor, first and second NMOS transistors, and a high turns ratio transformer. The transformer can include a primary coil having a center tap, thereby forming first and... | 09/06/2005 |
| 6936977 | Ballast circuit having enhanced output isolation transformer circuit with high power factor A ballast circuit includes an output isolation transformer having a primary winding and first and second secondary terminals coupled to opposing ballast lamp terminals for additively applying potentials on the primary winding and the first and second secondary windi... | 08/30/2005 |
| 6937115 | Filter having parasitic inductance cancellation An electrical component includes a capacitive impedance and a shunt path inductance cancellation feature provided by coupled windings. A filter having a capacitor with capacitor-path inductance cancellation provides enhanced performance over frequency compared with ... | 08/30/2005 |
| 6919693 | High-voltage transformer and discharge lamp driving apparatus A high-voltage transformer for lighting a plurality of discharge lamps has a primary coil for inputting an AC voltage and a secondary coil for outputting a predetermined AC voltage higher than the AC voltage inputted. The primary coil has a starter primary winding f... | 07/19/2005 |
| 6914392 | Switching apparatus for operating discharge lamps The following circuit is proposed for discharge lamps having a particularly high starting voltage. An a.c. voltage generator (1) provides a corresponding a.c. voltage. A starting voltage generating device, which comprises a piezo transformer (2), is co... | 07/05/2005 |
| 6906476 | Power control system for reducing power to lighting systems A power control system is disclosed for controlling the power supplied to a lighting system and limiting power during time of peak demands and the like wherein the lighting system includes a power source and a lighting load connected to the power source. The control... | 06/14/2005 |
| 6888320 | Switching power supply for discharge lamp and method for powering a lamp The invention concerns a method for powering a discharge lamp with a switching power supply. Said method is characterised in that it consists in: applying a voltage firing the lamp, then after the lamp has been energized, applying a lower service voltage to the firi... | 05/03/2005 |
| 6812652 | Constant current regulator for airport lighting A constant-current regulator for high-powered airport lighting loops combined a ferroresonant transformer and a digital programmable logic device to provide a versatile, software-modifiable current control for power transfer throughout a range of about 30 kW to 50 k... | 11/02/2004 |
| 6642672 | Integrated filter with common-mode and differential-mode functions An integrated filter with both common-mode and differential-mode functions is disclosed. The integrated filter comprises a magnetic core, two windings and a frame for installing the windings. The magnetic core further comprises a rectangular core and an I... | 11/04/2003 |
| 6597130 | Driving apparatus of discharge tube lamp A driving apparatus of a discharge tube lamp includes a voltage source; a plurality of AC conversion circuits for boosting a voltage supplied from the voltage source and generating a plurality of boosted AC signals; a plurality of discharge tubes for rece... | 07/22/2003 |
| 6583574 | Power saver for discharge lamps A power saver for discharge lamps, in which supply of electricity is not stopped instantaneously even though applied voltage is converted into lower voltage after lighting the discharge lamp, is disclosed. The power saver for discharge lamps includes a fi... | 06/24/2003 |
| 6570345 | Constant current regulator for airport lighting A constant-current regulator for high-powered airport lighting loops combined a ferroresonant transformer and a digital programmable logic device to provide a versatile, software-modifiable current control for power transfer throughout a range of about 30... | 05/27/2003 |
| 6433492 | Magnetically shielded electrodeless light source A dimmable electrodeless light source includes an electrodeless lamp, an electronic ballast and a dimming module. The light source further includes coupling transformers coupled to the electrodeless lamp for inductively coupling power to the lamp to gener... | 08/13/2002 |
| 6376989 | Dimmable discharge lamp for dielectrically impeded discharges A description is given of a method for dimming discharge lamps with dielectrically impeded discharges. A continuous or discontinuous power control can be effected by influencing an electric parameter of a pulsed active-power supply and by means of a suita... | 04/23/2002 |
| 6369525 | White light-emitting-diode lamp driver based on multiple output converter with output current mode control A white light-emitting-diode array driver circuit with a multiple output flyback (or forward) converter with output current mode control. The circuit comprises a power supply source and a transformer. The transformer has a primary winding coupled to, and ... | 04/09/2002 |
