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| Number | Title | Issue Date |
| 8014183 | Power converter with a feedback controller A power converter with a feedback controller includes a converter body with an input end for an input voltage, an output end for an output voltage, a controller with a feedback device, and a connector for connection with the output end of the converter body and with... | 09/06/2011 |
| 7760528 | Method and apparatus for providing high speed, low EMI switching circuits Methods and apparatus are provided for generating low EMI display driver power supply. The methods and apparatus include switching circuits that utilize two groups of parallel circuit traces, each of which is coupled to one end of a switching device. The two groups ... | 07/20/2010 |
| 7602628 | Power production during a reduced activity state In addition to other aspects disclosed, a method comprises providing a signal to a transformer for supplying power during a reduced activity state. The signal comprises a series of pulses that comprises a positive pulse and a negative pulse. The signal is a segmente... | 10/13/2009 |
| 7423391 | Power conversion device and vehicle equipped therewith A power conversion portion (10) and a connection portion (20) converting power between a fuel cell (FC) and a battery (BAT) corresponding to dc power supply and a motor generator (MG) corresponding to an ac machine, are configured of a matrix converter... | 09/09/2008 |
| 7362601 | Power supply device A power supply device includes two input ports, two output ports, a transformer having primary and secondary windings, a switch device, and a controller. The switch device includes a switching element connected in series with the primary winding, and a capacitor. Th... | 04/22/2008 |
| 7342367 | Motor drive circuit, motor system, and motor drive method A circuit suitable for formation as a small sized IC, able to decrease the number of externally attached parts and reduce the size, and stably rotating a motor. When rotating a rotor 101 by three-phase drive signals U, V, and W generated based on a CLK signal... | 03/11/2008 |
| 7336513 | Method of compensating output voltage distortion of half-bridge inverter and device based on the method A method of compensating output voltage distortion of a half-bridge inverter and a device based on the method discloses that the method includes the steps of measuring the voltage of the capacitor of the half-bridge inverter and then detecting the output voltage of ... | 02/26/2008 |
| 7333349 | Single-stage buck-boost inverter An improved Single-Stage Buck-Boost inverter (S2B2 Inverter) is provided, using only three or four power semiconductor switches and two coupled inductors in a flyback arrangement. The inverter can handle a wide range of dc input voltages and pr... | 02/19/2008 |
| 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 |
| 7292460 | Converter circuit for switching a large number of switching voltage levels A converter circuit is specified for switching a large number of switching voltage levels, which has n first switching groups for each phase, with the n-th first switching group being formed by a first power semiconductor switch and a second power semiconductor swit... | 11/06/2007 |
| 7242857 | Motor control circuit A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a squ... | 07/10/2007 |
| 7227273 | High frequency bus method Certain exemplary embodiments can include a system comprising an electric drive system for a machine. The system can include a rectifier adapted to convert AC power from an alternator to DC power. The system can include an inverter adapted to receive DC power from t... | 06/05/2007 |
| 7215099 | Method in frequency converter provided with voltage intermediate circuit, and frequency converter A method in a frequency converter provided with a voltage intermediate circuit in connection with interference in a network (5) to be supplied and a frequency converter (2), which comprises a network converter part (4) and an inverter part (3... | 05/08/2007 |
| 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 |
| 7180279 | Method for driving pulse-width-controlled inductive loads, and a drive circuit for this purpose When a switch (20) that is in series with the inductive load (10) is turned on, the rise behavior of the current (I) is first of all detected until a nominal value (Iref) is reached, and a pulse duty factor (Te/Ta) of a pulse width modulator device ( | 02/20/2007 |
| 7164590 | Power transfer system with reduced component ratings A power inverter control adjusts input power to track with output power to reduce energy handling requirements for an inverter DC bus. Input power to the power inverter circuit is measured and compared with a measurement of inverter output power. The comparison resu... | 01/16/2007 |
| 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 |
| 7116067 | Power converter controlling apparatus and method providing ride through capability during power interruption in a motor drive system A method of controlling a power converter (20) of a motor drive system (10)controls the power converter (20) during a first operating mode by applying a current control scheme, which sets power converter commands to control torque current flowin... | 10/03/2006 |
| 7113065 | Modular inductor for use in power electronic circuits A modular inductor arrangement is provided in which a footprint of an enclosure for single or multiple phase inductors provides enhanced thermal transfer. The inductor coil may be wound about an axis generally parallel to a mounting surface of the package, so as to ... | 09/26/2006 |
| 7106607 | Combined AC-DC to DC converter The invention relates to a combined AC-DC to DC converter. The converter provides the option of coupling to an AC supply source with at least one phase and the further option of coupling to at least one DC supply source. The converter obtains supply from at least on... | 09/12/2006 |
| 7099165 | Network harmonic scrubber An active filtration or harmonic scrubber system for power systems that convert AC power on an AC bus to DC power that cancels or reduces harmonic current injected by nonlinear loads onto the AC bus using high-bandwidth pulse width modulation (PWM) inverters. ... | 08/29/2006 |
| 7081734 | Ride-through method and system for HVACandR chillers A method of providing ride-through capability in a chiller/refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing variable frequency and voltage to power at least one motor. An inductio... | 07/25/2006 |
| 7076340 | Method of controlling speed of synchronous motor, and method of identifying constant of synchronous motor In sensorless vector control performed through use of a rotation speed of a synchronous motor 6 and the position of a rotor, a positive current is caused to flow to a γ axis on the assumption that a “d” axis serving as a true magnetic axis is out of phase with ... | 07/11/2006 |
| 7053582 | Control magnetic bearing device A control magnetic bearing device comprises a plurality of control magnetic bearings for contactlessly supporting a rotor, an electric motor for rotating the rotor, a magnetic bearing drive circuit for driving the magnetic bearings, an inverter for driving the elect... | 05/30/2006 |
| 7050312 | Multi-mode uninterruptible power supplies and methods of operation thereof An uninterruptible power supply apparatus includes a first bidirectional power converter circuit having first and second ports and a second bidirectional power converter circuit having first and second ports. The apparatus further includes a DC link that couples the... | 05/23/2006 |
| 7015679 | Circuit and method for supplying an electrical a.c. load A method and circuit for supplying a variable voltage to an electrical a.c. load (R, L), comprising: a control signal input for receiving a switching control signal to control load output voltage; first and second circuit output terminals (ACL1, ACL2) ... | 03/21/2006 |
| 6998800 | Current sensor for DC powered three phase motor control system A system is provided for sensing a motor current from a three phase inverter. A first resistor is coupled between a first transistor of the inverter and a supply voltage, and a second resistor is coupled between a second transistor of the inverter and ground. Circui... | 02/14/2006 |
| 6940259 | Generating device including magneto generator A generating device including a magneto generator, wherein: an AC control voltage is applied to an armature coil of the magneto generator from a battery via an inverter to change a phase angle of the AC control voltage, thus increase/reduce an output of the magneto ... | 09/06/2005 |
| 6853156 | Piezoelectric ceramic light starter A piezoelectric ceramic light starter, which includes a power switch, a piezoelectric transformer, and a frequency tracking unit, is disclosed. The power switch connected to a pulse width modulated (PWM) harmonic signal output terminal closes when the PWM harmonic s... | 02/08/2005 |
| 6850426 | Synchronous and bi-directional variable frequency power conversion systems A synchronous bi-directional active power conditioning system (11) suitable for wide variable frequency systems or active loads such as adjustable speed drives which require variable voltage variable frequency power management systems is disclosed. Common pow... | 02/01/2005 |
| 6843335 | Power conversion apparatus and mobile object incorporating thereof A positive side conductor and a negative side conductor of an input terminal electrically connected to semiconductor elements, are electrically insulated from each other, and are laminated with each other, and the input terminal having such a laminated structure, an... | 01/18/2005 |
| 6819576 | Power conversion apparatus and methods using balancer circuits A power conversion apparatus, such as an uninterruptible power supply (UPS), includes an input port, an output port, and first and second busses. An output circuit, for example, a half-leg inverter, is coupled to the first and second busses and to the output port an... | 11/16/2004 |
| 6798677 | Modular power converter A power converter includes at least one capacitor and at least two semiconductor power switches. Each capacitor includes a pair of connectors for connecting the capacitor to the at least two semiconductor power switches. Moreover, each capacitor includes at least on... | 09/28/2004 |
| 6717830 | MOS circuit for lowering forward voltage of diodes A circuit for lowering the effective voltage drop of a semi-conductor diode. The circuit includes a first Metal Oxide Semi-conductor (MOS) device connected in parallel with the diode. A bias voltage which is close to but lower than the threshold voltage is applied t... | 04/06/2004 |
| 6711038 | Method for controlling bi-directional switches in matrix converters In a method for controlling bi-directional switches in power converters, with separate control signals for both current directions, preferably 3×3 matrix converters, a switching process from a base main state, into a secondary main state, and vice versa, occurs aft... | 03/23/2004 |
| 6631080 | Systems and methods for boosting DC link voltage in turbine generators The present invention is directed to an active converter system for a permanent magnetic turbogenerator. A system in accordance with an embodiment of the present invention includes a DC voltage link and a first active converter including a connection for ... | 10/07/2003 |
| 6597138 | Method and apparatus for controlling power supplied to a motor A method and apparatus for controlling power supplied to a motor comprising a power controller having a source of electrical power for providing the necessary power to operate the apparatus, an oscillator for generating gating signals at a relatively high... | 07/22/2003 |
| 6559492 | On-die switching power converter with stepped switch drivers and method A DC-to-DC switching power converter includes switching elements having capacitive gate control inputs, an energy storage element and driver circuitry. Improved efficiency is achieved using adiabatic buffers to drive MOSFET switching elements with stepped... | 05/06/2003 |
| 6522098 | Controller for power device and drive controller for motor A semiconductor device comprising at least one power device, at least one control element for controlling the power device(s), a plurality of first terminals connected to the power device(s), a plurality of second terminals connected to the control elemen... | 02/18/2003 |
