Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8107265 | Current balanced push-pull inverter circuit with regeneration snubber circuit and voltage boost section This inverter circuit includes two switching elements which are turned alternately ON and OFF, and a first primary winding connected in series between these switching elements, and also includes an output transformer having a secondary winding for obtaining an outpu... | 01/31/2012 |
| 8094469 | Current balanced push-pull inverter circuit This inverter circuit includes first and second switching elements and an output transformer which has a first primary winding connected in series between the first switching element and the second switching element and a second primary winding for obtaining an outp... | 01/10/2012 |
| 8014177 | Switching power supply with pulse frequency modulation control A switching power supply exhibits high conversion efficiency and facilitates reducing the size thereof. The switching power supply includes a half-bridge circuit including a first series circuit formed of switching devices Q1 and Q2 and connected betwe... | 09/06/2011 |
| 7924580 | Switching inverters and converters for power conversion A switching inverter having two single-ended EF2 inverter sections coupled together with a shared ground and partially shared tunable resonant network that is coupled to at least one load, wherein each inverter section comprises a switching section, and w... | 04/12/2011 |
| 7835164 | Apparatus and method of employing combined switching and PWM dimming signals to control brightness of cold cathode fluorescent lamps used to backlight liquid crystal displays An AC power supply system modulates a high frequency switching signal with a pulse width modulation (PWM) signal to produce a composite signal. The duty cycle of the PWM component of the composite signal is used to control the brightness of a cold cathode fluorescen... | 11/16/2010 |
| 7796409 | Multilevel push pull power converter A power converter for converting an input voltage (Vin) into an output voltage (Vout), comprising a first supply potential and a second supply potential established by the input voltage, and at least one primary winding having two terminals, a center tap arranged be... | 09/14/2010 |
| 7719861 | Signal differentiation with differential conversion circuit A circuit for transmitting signals includes a transformer having an input side and an output side, the input side having a first end and a second end. A first transistor is coupled to the first end of the transformer, the first transistor being configured to provide... | 05/18/2010 |
| 7554823 | Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a ... | 06/30/2009 |
| 7423891 | Inverter device utilizing three switches controlled in a concurrent manner in a resonant transformer Described is an inverter device suitable for driving a cold cathode fluorescent lamp (CCFL), comprising a transformer having a primary winding and a secondary winding. The primary winding has two terminals connected to a return-path terminal of a direct current (DC)... | 09/09/2008 |
| 7394671 | Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a ... | 07/01/2008 |
| 7362077 | Pre-charge method for isolated boost converter A boost control module operates semiconductor switches of a boost converter circuit in an avalanche mode to precharge a boost output capacitor. The boost control module comprises a switching module that complementarily transitions a first semiconductor switch and a ... | 04/22/2008 |
| 7355867 | Power supply for an electric meter having a high-voltage regulator that limits the voltage applied to certain components below the normal operating input voltage Disclosed is an invention relating to a power supply for use in an apparatus for measuring electrical energy, comprising, in one embodiment, a first switching device, a device for storing electrical charge in electrical connection with the first switching device, a ... | 04/08/2008 |
| 7352596 | Method of operating a resonant push-pull converter in an above resonant frequency mode A method for operating a push-pull converter in an above resonant frequency operating mode, where the above resonant frequency operating mode produces a switching frequency that is higher than the natural operating resonant frequency of the converter circuit. As a r... | 04/01/2008 |
| 7312583 | Apparatus and method for driving a lamp unit, and liquid crystal display device using the same An apparatus for driving a lamp comprising at least one lamp, an inverter to supply an alternating current signal, a transformer to boost the signal from the inverter and to supply the boosted signal to the lamp, and a safety circuit to detect the signal flowing to ... | 12/25/2007 |
| 7310249 | Switching power supply circuit Enhancement of the power conversion efficiency and reduction of switching noise of a power supply circuit are achieved. The power supply circuit includes, on the primary side, a composite resonance type converter formed from a current resonance type converter and a ... | 12/18/2007 |
| 7298634 | Switching power supply circuit A switching power supply circuit includes a plurality of switching converters, each including a partial resonance voltage circuit combined with a current resonance type switching converter using a half-bridge connection system. For changeover control, a rectificatio... | 11/20/2007 |
| 7295095 | Electric component and method of producing the same In a push-pull switching circuit for a low-voltage, large current application, a decrease in resistance of a transformer and of its peripheral circuit is sought for. In view of this, a coil (2) is fixed at its terminal (T1) side, and is wound around a ... | 11/13/2007 |
| 7293181 | Use of one voltage regulator module to support two processors to improve power and thermal limitations Several processors have specifications setting forth that each processor be coupled to a separate specified voltage regulator circuit. Instead, a number of specified voltage regulator circuit(s) is coupled to the several processors. The number of voltage regulator c... | 11/06/2007 |
| 7288923 | Voltage-limited electric machine An electric alternator having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits around different portions of the winding which may be configured relative to one another... | 10/30/2007 |
| 7272023 | High efficiency power converter A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in ser... | 09/18/2007 |
| 7269034 | High efficiency power converter A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in ser... | 09/11/2007 |
| 7260731 | Saving power when in or transitioning to a static mode of a processor A method for reducing power utilized by a processor including the steps of determining that a processor is transitioning from a computing mode to a mode is which system clock to the processor is disabled, and reducing core voltage to the processor to a value suffici... | 08/21/2007 |
| 7251179 | Semiconductor storage apparatus A semiconductor storage apparatus according to one embodiment of the present invention, comprising: memory cells which need refresh operation; and a refresh control circuit which suspends the refresh operation when external access for reading out from or writing int... | 07/31/2007 |
| 7233509 | Parallel operating system of DC-AC converters and controller IC therefor A multiplicity of synchronized inverters for driving a multiplicity of loads such as CCFLs that require high ac voltages are arranged in close proximity of the respective loads and controlled in phase. A frequency determination capacitor and a frequency determinatio... | 06/19/2007 |
| 7233117 | Inverter controller with feed-forward compensation The present invention is an inverter controller with feed-forward compensation. The inverter controller includes an error amplifier, a high frequency oscillator (HFOSC) with feed-forward compensation, a comparator, and a driver. The error amplifier can output a sign... | 06/19/2007 |
| 7233137 | Power supply system A power supply system is provided, having: a primary side coil; a power transmission apparatus having a primary side circuit for feeding a pulse voltage resulted from switching a DC voltage which is obtained by rectifying and smoothing a commercial power supply to t... | 06/19/2007 |
| 7230390 | Cold cathode fluorescent lamp assembly A cold cathode fluorescent lamp (CCFL) assembly includes a pair of CCFLs, and an inverter-type drive circuit. The drive circuit includes a first transformer having a primary winding adapted to be coupled to a power supply module, and a secondary winding with a pair ... | 06/12/2007 |
| 7228242 | Adaptive power control based on pre package characterization of integrated circuits A method and system of adaptive power control based on pre package characterization of integrated circuits. Characteristics of a specific integrated circuit are used to adaptively control power of the integrated circuit. ... | 06/05/2007 |
| 7224589 | Inverter circuit for producing power factor correction effect Provided is an inverter circuit including a rectification and filter circuit and an inverter driver circuit interconnected the rectification and filter circuit and a load. The inverter driver circuit comprises a second controller for receiving light adjustment cycle... | 05/29/2007 |
| 7218541 | High efficiency two stage inverter In a two stage inverter providing power to a load, a first stage component is operable to receive a first voltage input and a first control input to generate a first voltage output, which is higher than the first voltage input. The first control input is indicative ... | 05/15/2007 |
| 7206209 | Switching power supply apparatus with error amplification control A switching power source device can enhance the power factor by increasing the conduction angle of an input current in a wide input voltage range, while obviating the increase of size and the increase of cost thereof, and lower the switching loss by removing higher ... | 04/17/2007 |
| 7203077 | Resonant charge power supply topology for high pulse rate pulsed power systems A system for charging a capacitor with relatively high energy pulses at a relatively high pulse repetition rate includes a voltage transformer. A resonant circuit is established having an inductor connected to the transformer's low voltage side and a capacitor conne... | 04/10/2007 |
| 7196916 | Alternated duty cycle control method for half-bridge DC-DC converter Apparatus, methods system and devices for using alternated duty cycle control to achieve soft-switching for at least one switch of the two half-bridge switches. When soft-switching can be only achieved for one switch, alternated duty cycle control alternates the sof... | 03/27/2007 |
| 7196482 | PWM controller with automatic low battery power reduction circuit and lighting device incorporating the controller A controller for controlling a voltage applied to a load from a power source includes a square wave producing circuit for connection in the circuit with the battery and the lamp. The square wave producing circuit produces a variable duty cycle square wave for contro... | 03/27/2007 |
| 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 |
| 7190143 | Pulse width modulation (PWM) rectifier with variable switching frequency A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is gen... | 03/13/2007 |
| 7184281 | Buck converter with high efficiency gate driver providing extremely short dead time A buck converter has a driver circuit with a drive transformer that provides complementary voltages to the buck converter switches. The drive transformer may have two secondary windings, with one winding for each converter switch. As one converter switch experiences... | 02/27/2007 |
| 7180322 | Closed loop feedback control of integrated circuits Systems and methods for closed loop feedback control of integrated circuits. In one embodiment, a plurality of controllable inputs to an integrated circuit is adjusted to achieve a predetermined value of a dynamic operating indicator of the integrated circuit. An op... | 02/20/2007 |
| 7180248 | Inductively coupled ballast circuit A ballast circuit is disclosed for inductively providing power to a load. The ballast circuit includes an oscillator, a driver, a switching circuit, a resonant tank circuit and a current sensing circuit. The current sensing circuit provides a current feedback signal... | 02/20/2007 |
| 7177168 | Power converting apparatus and power generating apparatus AC module makers must prepare two types of AC modules for the 100-V and 200-V outputs only for domestic supply. For foreign countries, the makers must manufacture AC modules compatible with more system voltages. To solve these problems, the control circuit of an AC ... | 02/13/2007 |
