Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 7729145 | Power converter and method, and triangle wave generating circuit A power converter that converts an AC power outputted from a generator into a DC power and supplies it to a battery (load). The power converter includes a thyristor (switch unit) connected between an output unit of the generator and the battery (load); and a gate co... | 06/01/2010 |
| 7471529 | Universal three phase controllers for power converters The systems and methods described herein provide for a universal controller capable of controlling multiple types of three phase, two and three level power converters. The universal controller is capable of controlling the power converter in any quadrant of the PQ d... | 12/30/2008 |
| 7368891 | Charge control method of capacitor in thyristor converter Charging time of a capacitor is shortened while avoiding erroneous firing due to distortion of a power supply voltage and sustaining an inrush current at a constant level. In the charge control method of a capacitor in a thyristor converter comprising a thyristor fo... | 05/06/2008 |
| 7355865 | Method and apparatus for rejecting the second harmonic current in an active converter with an unbalanced AC line voltage source A method and apparatus for altering converter control as a function of the degree of unbalance in supply line voltages to substantially eliminate second harmonics on the supply lines caused by active control of the converter including identifying supply line peak am... | 04/08/2008 |
| 7321500 | Electric power converter A voltage source converter for high power application containing a plurality of valves, each valve containing a plurality of extinguishable semiconducting elements, and a valve control unit containing a computer and a pulse-width modulator providing an executing con... | 01/22/2008 |
| 7283377 | Method for controlling firing angle under line dip situations A method and apparatus for converting AC power into DC power are disclosed, where the method includes receiving the AC power, and converting the AC power into the DC power by way of a rectification device, where the rectification device is capable of being controlle... | 10/16/2007 |
| 7277491 | Data access arrangement using a high frequency transformer for electrical isolation An electrical isolation barrier for use in a Data Access Arrangement uses a high frequency (HF) transformer 24 to provide isolation. An input signal, which may be analog or digital, is connected to a modulator. The analog output of the modulator is connected to the ... | 10/02/2007 |
| 7265513 | Variable reluctance electric power system A variable reluctance electric power system which comprises an alternator and a motor having a rotor with longitudinal lobes and no windings, commutators, slip rings, magnets, or laminations. The alternator and the motor have stators which have conventional windings... | 09/04/2007 |
| 7235891 | Power system having generator driven by engine An apparatus for controlling the operation of power conditioners (10) for supplying the generated power to an external power system such as a commercial power system, in which power conditioners (10) are interconnected to an external power system, the ... | 06/26/2007 |
| 7224336 | Display device drive unit and driving method of display device The display device drive unit includes a liquid crystal driver that generates a liquid crystal driving voltage for display device driving, and can operate in a master mode for outputting the foregoing voltage and in a slave mode for driving the display device in acc... | 05/29/2007 |
| 7222244 | Semiconductor device including a prediction circuit to control a power status control circuit which controls the power status of a function circuit A semiconductor device having a functional circuit block with predictive power controller is provided so as to construct a system LSI manufactured in a practicable number of design steps, which is extensible and in which power is reduced. The functional circuit bloc... | 05/22/2007 |
| 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 |
| 7184480 | Digital PWM generator A digital PWM circuit is provided. One exemplary circuit includes a binary counter, an n-bit DAC and a comparator. The binary counter generates a plurality of binary signals in increasing and/or decreasing value. The DAC circuit generates ramp signals composed of a ... | 02/27/2007 |
| 7173834 | Half-controlled silicon-controlled rectifying system and method thereof A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the c... | 02/06/2007 |
| 7164242 | Variable speed drive for multiple loads A variable speed drive is provided having a converter to convert an AC voltage to a DC voltage, a DC link to filter and store energy from the converter, and a plurality of inverters, wherein each inverter is configured to convert a DC voltage to an AC voltage to pow... | 01/16/2007 |
| 7162655 | Method and system for information handling system power control Power supply response to variations in power demand by a microprocessor is improved with a compensation loops that estimate changes in load current with improved speed. The load current estimate is performed in part with a capacitance feed forward compensation loop ... | 01/09/2007 |
| 7084579 | Two light level ballast An electronic ballast (100) for powering at least one gas discharge lamp (30) at two light levels includes a full-wave rectifier circuit (120) and a detector circuit (200). Detector circuit (200) provides an output voltage that is ... | 08/01/2006 |
| 7068524 | Generator An abnormality of a generator provided with a plurality of power supply units is easily detected. Each of the power supply units includes each of output windings L1 to L4, which are wound independently of each other around the single iron core, and eac... | 06/27/2006 |
| 7042194 | Controller for a wound-rotor induction motor A controller for a wound-rotor induction motor includes a first voltage-type converter connected to a secondary winding of the motor, a capacitor for smoothing DC output thereof, a second voltage-type converter to supply an AC power supply with regenerated secondary... | 05/09/2006 |
| 7030583 | Method for the commutation of brushless direct current motor A method for the commutation of a brushless direct current motor having at least one motor winding in which the position of the rotor with respect to the stator is determined, a commutation signal is generated from the position, and the motor winding is energized by... | 04/18/2006 |
| 7012823 | Method and control system employing conduction monitors for detecting unbalanced current condition of alternating current phases A method controls and monitors a parallel array of a plurality of rectifier bridges each of which is adapted to convert a plurality of alternating current voltages of a plurality of alternating current phases to a voltage. The bridges include a plurality of segments... | 03/14/2006 |
| 6998735 | Controlled rectifier bridge, control system, and method for controlling rectifier bridge by disabling gate control signals A controlled rectifier bridge includes a plurality of segments each having an element responsive to a control signal, and an output having a voltage, a first current and a second current. Sensors provide sensed current values from first and second output currents fr... | 02/14/2006 |
| 6958923 | Rectifying circuit The invention relates to a rectifying circuit comprising a bridge connection with RC protected thyristors, a direct voltage circuit with capacitance and a charging circuit containing a diode (3) or a corresponding component for charging the capacitance of the... | 10/25/2005 |
| 6937483 | Device and method of commutation control for an isolated boost converter A device and method of commutation control for an isolated boost converter provides a unique commutation logic to limit voltage spikes by utilizing switches on the secondary side to minimize a mismatch between current in the inductor and current in the leakage induc... | 08/30/2005 |
| 6919650 | Hybrid synchronization phase angle generation method A hybrid use of a phase-locked-loop controller and a microprocessor-based controller to synchronize the phase angles of a three-phase AC power source, such as a static power converter, with those of a three-phase power grid. The phase-angle synchronization may enabl... | 07/19/2005 |
| 6765425 | Mosgate device driver for synchronous rectification of a 3 phase sinusoidal source A rectifying circuit and method to produce a DC output by rectifying a sinusoidal source having a plurality of output phase voltages and a plurality of phase-to-phase voltages, the rectifying circuit including a bridge circuit coupled to the output phase voltages, t... | 07/20/2004 |
| 6704214 | Excitation control system and method employing de-excitation trip logic An excitation control system includes a circuit breaker, a bridge and a controller. The bridge converts AC phases from the breaker to an excitation voltage. The controller includes an output to open the breaker, a first sub-system inputting voltages corre... | 03/09/2004 |
| 6594164 | PWM controlled power conversion device A power conversion device according to the invention of the present application includes: an active current controller that calculates a phase angle reference value for determining the ON/OFF phase with reference to the AC power source voltage phase, from... | 07/15/2003 |
| 6535404 | Controlling operation of an AC/DC converter An AC/DC converter has an auxiliary control system which attenuates or suppresses an unwanted or non-characteristic harmonic component (such as a 3rd harmonic component) of voltage in an AC power system caused by operation of the converter. The... | 03/18/2003 |
| 6442051 | Full thyristor bridge circuit with free wheeling diode for de-excitation control and stability sensing A circuit is provided for use in a synchronous generator excitation system. The circuit comprises a three-phase bridge having six legs. The bridge is connected with an AC power supply. A thyristor is provided in each of the six legs, wherein the thyristor... | 08/27/2002 |
| 6385066 | Method and system for detecting a zero current level in a line commutated converter A method and system for determining zero current level occurrences in a reversible power converter without requiring additional component complexity and costs. A digital controller selectively determines the line to line voltage for the most recently fire... | 05/07/2002 |
| 6366483 | PWM rectifier having de-coupled power factor and output current control loops A PWM rectifier wherein the switching bridge has m input filter capacitors, each connected at a terminal thereof, to the line side of the bridge. These terminals are used to connect an m-phase a.c. power supply (m>=1) having a per phase system inductance ... | 04/02/2002 |
| 6320773 | Transformer/rectifier for aircraft ground power unit A ground power unit for providing dc power for aircraft includes a source of 3-phase ac power and a transformer/rectifier arrangement for converting 3-phase ac power to dc power. The transformer/rectifier arrangement includes an A-phase transformer formed... | 11/20/2001 |
| 6278623 | System and method for compensating for voltage notches in two-phase phase locked loops A method and system for compensating for voltage notches in phase locked loop (PLL) control devices. A bridge firing controller receives signals representative of two of the line to line voltages received by the bridge. The controller includes a PLL synch... | 08/21/2001 |
| 6075717 | PWM rectifier control with switching losses equally distributed among multiple switching devices Switching losses are distributed equally between multiple switching devices in a rectifier bridge (50) in which the rectifier bridge comprises at least a first pair of serially connected switching devices (56A, 56B) connected between positive and negative... | 06/13/2000 |
| 5963440 | Controlled three-phase rectifier with current comparison between rectifier segments A parallel array of a plurality of controlled rectifier bridges for converting multi-phase AC current to DC. Each bridge includes a plurality of rectifier segments. One segment for each polarity of each phase of current. A sensor monitors the current and ... | 10/05/1999 |
| 5963441 | Alternating current rectifier bridge and system for measuring average current per bridge segment A three-phase controlled rectifier bridge for converting alternating current to direct current includes six segments for each of the positive and negative polarities of each of three AC phases. Each of the segments has a semiconductor controlled rectifier... | 10/05/1999 |
| 5892674 | Method and apparatus for power converting AC into DC or DC into AC by converter having common phase connection In a power converter apparatus having a three-phase AC power supply connecting unit, a positive side capacitor, a negative side capacitor, first-phase and third-phase converting circuits each including switching elements connected in series, and a common ... | 04/06/1999 |
| 5491624 | AC to DC power conversion system The present invention converts an alternating current input into a direct current output by switching a current load at high speeds to create a voltage envelope having a maximum allowed voltage and a minimum allowed voltage. Complementary switching elemen... | 02/13/1996 |
| 5483435 | Power generation system having induction generator and controlled bridge rectifier A power generation system is constituted by an induction generator and a converter. An output current waveform of the induction generator is determined by the magnetic flux, speed, winding impedance, DC output voltage, and load of the induction generator.... | 01/09/1996 |
