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| Number | Title | Issue Date |
| 7800929 | Control method for PWM cyclo-converter by selectively turning on a two-way semiconductor switch and controller A control method for a PWM cyclo-converter is provided in which a voltage can be accurately generated even when a voltage command is small. In the PWM cyclo-converter, the turning on and off operations of two-way semiconductor switch are repeated at intervals... | 09/21/2010 |
| 7782644 | Method and apparatus for supplying power A power supply includes a power source having at least one power source output, and a plurality of drivers connected to the at least one power source output. At least one of the plurality of drivers includes a bridge network having a first switch, a second switch an... | 08/24/2010 |
| 7729148 | Method for thermal protection of frequency converter and a frequency converter A method for thermal protection of a frequency converter and a frequency converter includes means for controlling the output current of the frequency converter. The method includes the steps of determining predetermined data points which define a thermal current lim... | 06/01/2010 |
| 7626840 | Parallel multiplex matrix converter The parallel multiplex matrix converter couples in parallel at least two matrix converters, each of which PWM-controls bidirectional switches coupling input phases from an AC power supply to each output phases so as to output an arbitrary AC voltage or DC voltage. T... | 12/01/2009 |
| 7577009 | PWM cycloconverter and control method for PWM cycloconverter It is an object of the present invention to provide a PWM cycloconverter that can compensate an error between a voltage command and a real voltage generated by a commuting operation. The PWM cycloconverter for solving the above-described problem includes: an ... | 08/18/2009 |
| 7457141 | AC adaptor It is an object of this invention to provide an AC adaptor capable of achieving downsizing and cost reduction, and having both a constant-voltage/constant-current control function necessary for battery charge, and an optimum current control function for driving of a... | 11/25/2008 |
| 7421301 | Speed-variable maximum delay clamping when using variable-delay random PWM switching A control system and a method of using the same for an electric machine having a random number generating module generating a random number ranging from a first value to a second value, a multiplying module multiplying the random number and a sample rate to generate... | 09/02/2008 |
| 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 |
| 7339809 | Systems and methods for electrical power regulation and distribution in aircraft The present invention comprises systems and methods for electrical power regulation and distribution. In an embodiment, a system includes a modulator coupled to the source that receives an unregulated output waveform and is operable to produce a first composite wave... | 03/04/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7321835 | Method for improving the mode of operation of a matrix converter A method for operating a matrix converter in which m phases of a generator generating alternating voltage with n (n | 01/22/2008 |
| 7317998 | Method for the calculation and the assessment of the frequency spectrum of a matrix converter A method for the calculation of an output spectrum of a matrix converter in which m phases of a generator as an input are alternatingly connected via a multiple number of controllable bi-directional switches arranged in an (m×n) matrix with n (n | 01/08/2008 |
| 7310254 | AC-to-AC (frequency) converter with three switches per leg AC-to-AC power conversion systems and methods are presented, in which a small number of asymmetrical power switching devices are used to convert input AC power to output AC power of constant or variable frequency. ... | 12/18/2007 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7254003 | Differential nulling avalanche (DNA) clamp circuit and method of use A circuit for protecting an electronic device including a differential nulling avalanche clamp circuit (200, 300) and method of using the circuit in an electronic system (100) to limit radio frequency overdrive. The electronic system (100) inclu... | 08/07/2007 |
| 7212421 | Combination feedback controller and power regulator using same A combination controller incorporates features of a classic controller and a state space controller to function as a hybrid controller unit. The PID portion of the classic controller regulates the steady state error and is separated from the pulse width modulated co... | 05/01/2007 |
| 7136724 | Electrical power distribution system for street lighting The invention comprises an electric power distribution system for providing power to a plurality of loads. An energy reduction device receives high voltage electrical power from a utility. A processor controls three variable transformer windings to produce electrica... | 11/14/2006 |
| 7110435 | Spread spectrum applications of universal frequency translation Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified up-conversion and spreading, RAKE receivers utilizing unified down-conversion an... | 09/19/2006 |
| 7084524 | Bi-directional matrix converter with reverse start-up A method for operating a matrix converter that includes converting m phases of a generator into alternating voltage with n phases of a load connected to a network, wherein n | 08/01/2006 |
| 7082171 | Phase shifting applications of universal frequency translation A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called an aliasing signal). By controlling the relative sampling time, the UFT modul... | 07/25/2006 |
| 7072390 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 07/04/2006 |
| 7054296 | Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ... | 05/30/2006 |
| 7039372 | Method and system for frequency up-conversion with modulation embodiments A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ... | 05/02/2006 |
| 7034345 | High-power, integrated AC switch module with distributed array of hybrid devices A novel architecture of high-power four-quadrant hybrid power modules based on high-current trench gate IGBTs and arrays of low-current wide-bandgap diodes is conceived. The distributed physical layout of high power density wide-bandgap devices improves the cooling ... | 04/25/2006 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
| 7015673 | Method and apparatus for reducing generated heat in three-phase motors driving air circulation fans in large industrial refrigerators and freezers A method and apparatus is disclosed for reducing the heat generated by three-phase motors operating under load in cooled chambers such as industrial walk-in refrigerators and freezers. Specific control elements are introduced into the three power conductors connecte... | 03/21/2006 |
| 7010286 | Apparatus, system, and method for down-converting and up-converting electromagnetic signals Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive o... | 03/07/2006 |
| 7006805 | Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service A receiver having multi-mode and multi-band functionality and capabilities is described herein. The receiver is capable of selectively operating over a plurality of bands and channels. The receiver operates in a plurality of modes, including but not limited to a sin... | 02/28/2006 |
| 7005829 | System for precharging a DC link in a variable speed drive A variable speed drive with a converter that is controllable to precharge a DC link is provided. The variable speed drive also includes an inverter. The converter converts a fixed line frequency, fixed line voltage AC power from an AC power source into DC power. The... | 02/28/2006 |
| 6992907 | Wave transformation method and device The present invention relates a waveform transformation method and apparatus. It uses multilevel transformation module in series, and the output voltages of power modules at all levels are superposed to get the total output voltage, whereas each power transformation... | 01/31/2006 |
| 6992908 | Method and arrangement for charging intermediate circuit of frequency converter A method and arrangement for charging an intermediate circuit of a frequency converter, the intermediate circuit of the frequency converter comprising one or more capacitors, and the frequency converter having means for charging the intermediate circuit, the means c... | 01/31/2006 |
| 6980890 | Method for designing a power factor controller apparatus A method for designing a power factor controller apparatus for a power distribution network comprising the phases of: configuring, in a predefined computerised support, an interactive computerised environment (2) dedicated to the management of data and/or pro... | 12/27/2005 |
| 6972543 | Series resonant inductive charging circuit An apparatus to charge a power supply inductively, with increased efficiency due to resonance, comprises an LC series resonance circuit formed by a capacitor and a primary inductive coil coupled in series with the capacitor, and a secondary inductive coil positioned... | 12/06/2005 |
| 6917449 | Image processing apparatus and method of the same, and storage medium A clock signal is frequency-modulated and an image processing operation is executed synchronously with the frequency-modulated clock signal to generate image data which is stored in a memory. Image data written in the memory is read synchronously with a clock signal... | 07/12/2005 |
| 6914296 | Controllable semiconductor component with multi-section control electrode The controllable semiconductor component (1) has a body (10) consisting of doped silicon. Two separate electrodes (3, 4) are connected to the silicon, between which an electric operating voltage (U) of the component (1) is applied. A cont... | 07/05/2005 |
| 6885171 | Compensation of reactive power via a frequency converter A method and an apparatus for compensating reactive power and/or harmonic currents in an alternating-current network by means of a frequency converter (1) feeding an alternating-current load (3), which frequency converter has a mains bridge (10)... | 04/26/2005 |
| 6826065 | Method of commutation of current by bi-directional switches of matrix converters A method of commutation of current by separately controlled in each direction bi-directional switches of a matrix converter (MC) with at least three input phases, which allows to provide a safe step-by-step commutation of the current by MC switches without using inf... | 11/30/2004 |
| 6693813 | Device for quasi-direct pulse-width controlled energy conversion between three-phase system Three phase input voltage systems and three phase output voltage systems connected between a first rail and a second rail. Each of the three phase input voltage system includes an interruptible power transistor. Two series connected reverse diodes are con... | 02/17/2004 |
| 6510068 | Pulse width modulation utilizing a shifted control signal In one embodiment, a method for use with a power transfer device is characterized by shifting a control signal with a waveform having a randomly variable period; and switching said power transfer device with a resultant shifted control signal. In addition... | 01/21/2003 |
