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 |
| 7787273 | Inverter circuit with switch circuit having two transistors operating alternatively An exemplary inverter circuit (2) includes a first switch circuit (22) including a first transistor (221) and a second transistor (222); a second switch circuit (23) including a third transistor (231) and a fourth transistor... | 08/31/2010 |
| 7423890 | Push-pull converter, in particular for driving cold-cathode fluorescent lamps A push-pull converter has a transformer provided with a primary winding and a secondary winding. A capacitive element is connected between the input terminals of the primary winding, and two switch elements are arranged between a respective input terminal of the pri... | 09/09/2008 |
| 7405544 | Voltage regulating circuit for uninterruptible power supply A voltage regulating circuit has a first switch, a transformer and a second switch. The first switch has an input node, a first node and a second node. The transformer is connected to the switches has a first coil and a second coil. The first coil and the second coi... | 07/29/2008 |
| 7321207 | Inverter apparatus and liquid crystal display including inverter apparatus An inverter apparatus for driving a plurality of lamp units including a plurality of lamps is provided. The inverter apparatus includes a plurality of inverters. Each inverter includes a delay block delaying an input ON/OFF signal to generate an output ON/OFF signal... | 01/22/2008 |
| 7301248 | Control method for voltage boosting circuit A control method for a voltage boosting circuit adapted to be used in an uninterruptible power supply is proposed. The uninterruptible power supply includes a battery module and a voltage boosting circuit comprising a plurality of switch elements, in which the unint... | 11/27/2007 |
| 7295448 | Interleaved power converter A power converter architecture interleaves full bridge converters to alleviate thermal management problems in high current applications, and may, for example, double the output power capability while reducing parts count and costs. For example, one phase of a three ... | 11/13/2007 |
| 7288903 | Driving device of light source for display device A driving device of a light source for a display device is provided. The light source includes a plurality of lamps connected in parallel to each other and each lamp has a first terminal and a second terminal. The driving device also includes a lamp state sensing un... | 10/30/2007 |
| 7289329 | Integration of planar transformer and/or planar inductor with power switches in power converter A power converter integrates at least one planar transformer comprising a multi-layer transformer substrate and/or at least one planar inductor comprising a multi-layer inductor substrate with a number of power semiconductor switches physically and thermally coupled... | 10/30/2007 |
| 7271546 | Lighting device for dielectric barrier discharge lamp This invention aims to decrease the leakage current of a dielectric barrier discharge lamp, and to prevent generation of the luminance slope between both electrodes. Electrodes 3 and 4 are formed in the outer surface of the dielectric barrier discharge... | 09/18/2007 |
| 7254048 | Power supply capable of AC and DC input utilizing winding of transformer as boost inductor A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the plurality of input voltages is provided at a center tap of a secondary windin... | 08/07/2007 |
| 7248488 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 07/24/2007 |
| 7200017 | Controller and driving method for supplying energy to display device circuitry A controller for controlling at least two power circuits comprises a phase-shift selector for generating a reference signal according to variable input signals, the reference signal is programmed to indicate an amount of phase-delay according to a number of CCFL pow... | 04/03/2007 |
| 7193867 | DC converter A DC converter alternately turns on and off a main switch Q1 connected in series with a primary winding P1 of a transformer T and a sub-switch Q2 contained in a series circuit connected to each end of the primary winding P1 of the transfo... | 03/20/2007 |
| 7193868 | Switching power supply circuit A wide-range compatible voltage resonant converter provides high efficiency and allows use of low-breakdown-voltage products for a circuit. The voltage resonant converter is provided with a secondary-side parallel resonant circuit and a secondary-side series resonan... | 03/20/2007 |
| 7173380 | Push-pull driver with null-short feature A push-pull driver for powering fluorescent lamps in a backlight system includes a transformer with three primary windings to realize the advantages of both a push-pull switching topology and a full-bridge switching topology. The first and the second primary winding... | 02/06/2007 |
| 7157865 | Circuit for driving cold cathode tubes and external electrode fluorescent lamps A circuit for driving cold cathode tubes and external electrode fluorescent lamps uses only 19–26 watts of power. A steady square wave oscillator generator sets a running frequency for the circuit. A high voltage inductor or high voltage/high frequency transformer... | 01/02/2007 |
| 7148659 | Programmable AC/DC power supply A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the plurality of input voltages is provided at a center tap of a secondary windin... | 12/12/2006 |
| 7136293 | Full wave series resonant type DC to DC power converter with integrated magnetics A full wave DC/DC converter magnetically integrates into the transformer assembly the functions of the resonant inductor, magnetizing inductor and the output filter inductor. The primary and the secondary windings are assembled on a gapped center leg of an E-core, w... | 11/14/2006 |
| 7133298 | High frequency voltage regulating transformer based converter A switching regulator and method of fabricating a switching regulator is disclosed. In one embodiment a switching regulator comprises a transformer having a primary winding and a secondary winding, an inductor (L) connected to an input of the primary winding, and a ... | 11/07/2006 |
| 7133299 | Zero voltage switching power conversion circuit A switching power conversion circuit comprises a saturable load assembly, a first switching inductance coil assembly and a second switching inductance coil assembly. The saturable load assembly is composed of a load and a saturable reactor. The first switching induc... | 11/07/2006 |
| 7126831 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 10/24/2006 |
| 7112943 | Enabling circuit for avoiding negative voltage transients An enabling circuit for enabling a DC—DC converter having a capacitor coupled to an output terminal of the DC—DC converter to be controlled by a control signal. The enabling circuit may include a comparison circuit configured to compare a feedback signal represe... | 09/26/2006 |
| 7088601 | Power conversion apparatus and methods using DC bus shifting A power converter apparatus, such as a double-conversion or line-interactive UPS, includes first and second DC voltage busses and a polyphase DC to AC converter circuit coupled to the first and second DC voltage busses and operative to generate a polyphase AC output... | 08/08/2006 |
| 7084580 | Discharge lamp lighting circuit A discharge lamp lighting circuit 1 has: a DC-AC converter circuit 3 which receives a DC input, and which conducts AC conversion and a boosting operation; and a starting circuit 4 which supplies a starting signal to a discharge lamp 10. T... | 08/01/2006 |
| 7075246 | Discharge lamp illumination circuit A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3 which effects AC conversion and boosting upon receipt of a DC input, and a starter circuit 4 for supplying a start-up signal to a discharge lamp. Power output from the DC-A... | 07/11/2006 |
| 7075245 | Driving circuit for multiple cold cathode fluorescent lamps backlight applications The present invention provides a driving circuit for driving a light source. The driving circuit includes a serial-arranged transformers system having multiple primary windings and secondary windings; a first switch conducting current though a first path and a secon... | 07/11/2006 |
| 7057611 | Integrated power supply for an LCD panel The present invention provides an integrated LCD panel power supply formed on a single printed circuit board. The integrated power supply includes at least one DC/AC control unit, at least one DC/DC buck converter unit and at least one DC/DC boost control unit. Each... | 06/06/2006 |
| 7046526 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 05/16/2006 |
| 7019996 | Power converter employing a planar transformer A power converter may employ a planar transformer to minimize winding conduction loss, and the switching devices of the power converter may be aligned in lines parallel to an edge of the planar transformer to minimize the termination leakage inductance. The windings... | 03/28/2006 |
| 7016209 | Single stage AC/DC converter with piezo transformer A single stage AC/DC converter with piezo transformer is provided. The AC/DC converter is suitable for converting an AC power into a DC power and is comprised of a rectification module, a switching module, a driving module, a piezo transformer, and an output rectifi... | 03/21/2006 |
| 7012380 | Information handling system with dual mode inverter An information handling system (IHS) is provided which includes an inverter circuit capable of operating over an extended DC input voltage range without substantial degradation in efficiency. A DC input voltage is converted to an AC input voltage. A first turns rati... | 03/14/2006 |
| 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 |
| 6980450 | High power density inverter and components thereof A compact high-power pure-sinewave inverter amenable to mass manufacturing techniques. Methods for increasing the power rating, power density and/or power conversion efficiency of a sinewave-modulated pulse-width-modulated (PWM) inverter having a either half-bridge ... | 12/27/2005 |
| 6967852 | Power converter with dynamic current limiting An electrical power converter receives input power of one type or level at input terminals and supplies output power of another type or level at output terminals. The power converter includes a high frequency transformer, an input circuit connected between the input... | 11/22/2005 |
| 6967520 | Gate drive circuit, which makes the gate-charge flow back to the load and the main power source A gate driving circuit having: a direct current power source; a driving signal source for outputting signal; a main switch device, having a gate terminal in which the signal outputted from the driving signal source is inputted, for controlling a conduction state bet... | 11/22/2005 |
| 6967415 | Power source apparatus A power source apparatus comprising: a direct current power source to output a first voltage; a load driven with a second voltage higher than the first voltage; a booster converter to boost an output from the direct current power source to the second voltage; and a ... | 11/22/2005 |
| 6963497 | Power converter with an inductor input and switched capacitor outputs A power converter circuit has an inductor input and switching means to put a pair of capacitors alternately in series or in parallel. By pulse width modulating between the states, the voltage on the capacitors can be controlled over a two to one variation of the inp... | 11/08/2005 |
| 6949912 | Enabling circuit for avoiding negative voltage transients An enabling circuit including a comparison circuit, a switching circuit, and an output decision circuit. The comparison circuit compares a first comparison signal representative of a charge on a capacitor of a DC to DC converter with a second comparison signal repre... | 09/27/2005 |
| 6946806 | Method and apparatus for controlling minimum brightness of a fluorescent lamp An efficient power conversion circuit for driving a fluorescent lamp uses a minimum pulse generator circuit to control the minimum on-time of a time modulated signal to increase the dimming range of the fluorescent lamp operating over a wide range of temperature and... | 09/20/2005 |
| 6940735 | Power converter system A power converter system advantageously employs a modular, bi-directionally symmetrical power converter assembly in a readily customizable configuration to interconnect a direct current power source to a three-phase alternating power grid. Connections external to th... | 09/06/2005 |
