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| Number | Title | Issue Date |
| 8179702 | Voltage synthesis using virtual quadrature sources Voltage synthesis using virtual quadrature sources may be provided. First, a quadrature wave form may be created. The quadrature wave form may have the same frequency as an input voltage and may be ninety degrees out of phase with the input voltage. Next, a harmonic... | 05/15/2012 |
| 8174853 | Variable speed drive Systems and methods for improved VSDs are provided. One embodiment relates to an apparatus for common mode and differential mode filtering for motor or compressor bearing protection when operating with VSDs, including conducted EMI/RFI input power mains mitigation. ... | 05/08/2012 |
| 8050061 | Control circuit for switching power supply A control circuit for a switching power supply (SPS) includes power input and output interfaces, a relay, a relay driving circuit, a microprocessor, and an alternating current/directing current (AC/DC) converter. The power input interface receives an external altern... | 11/01/2011 |
| 8023294 | Noise reduction systems and methods for unshielded coupling of switch mode power supply We describe a switch mode power supply having a power input, a switch, a transformer, and a power output. The transformer has a primary winding coupled to said power input via said switch, and a secondary winding coupled to said power output. The transformer further... | 09/20/2011 |
| 7830682 | DC component elimination at output voltage of PWM inverters A control system for a PWM inverter may reduce a DC component of an output of the inverter. An output voltage signal may be attenuated with a low-pass filter to produce a signal with a high DC content. A duty cycle of an output of the low pass filter may be determin... | 11/09/2010 |
| 7800925 | Mitigation of unbalanced input DC for inverter applications Mitigating the DC content of an AC output from an inverter is important for electrical system reliability. The inverter may be powered by unbalanced DC inputs while still mitigating the DC content of the AC output wavefrom. The present invention provides methods to ... | 09/21/2010 |
| 7778052 | Method for operating a converter circuit and apparatus for implementing the method A method is disclosed for the operation of a converter circuit, wherein the converter circuit has a converter unit having a multiplicity of actuatable power semiconductor switches and an LCL filter which is connected to each phase connection of the converter unit, i... | 08/17/2010 |
| 7768803 | Control device for power converter A control circuit for a power converter includes a voltage command unit that generates a voltage command signal, a voltage command compensation unit that compensates the voltage command signal to generate a compensatory voltage command signal, and a switching patter... | 08/03/2010 |
| 7760523 | Method and apparatus to improve regulation of a power supply Techniques are disclosed to regulate a power supply with a compensation signal generation circuit. One example regulated power supply includes a sense circuit coupled to sense an output voltage of the regulated power supply. The regulated power supply also includes ... | 07/20/2010 |
| 7729139 | Current source inverter with energy clamp circuit and controlling method thereof having relatively better effectiveness The provided current source inverter includes a buck converter having an input capacitor and an output inductor, receiving a DC input voltage, and generating an output inductor current, a DC/AC converter having an output capacitor, receiving the output inductor curr... | 06/01/2010 |
| 7710749 | Method for operating a converter circuit A method and arrangement are disclosed for operating a converter circuit. Such a converter circuit has a converter unit having a multiplicity of drivable power semiconductor switches. The converter unit is connected to an electrical AC voltage supply system on the A... | 05/04/2010 |
| 7688604 | AC voltage output apparatus and hybrid vehicle including the same A first inverter control unit includes a harmonic generation unit. The harmonic generation unit generates a harmonic voltage instruction having a phase opposite to a harmonic generated at a neutral point of a motor-generator when the motor-generator revolves, based ... | 03/30/2010 |
| 7606052 | Filter device A filter device that suppresses electromagnetic interference generated in an alternating current circuit connected to a power converter with an alternating current output includes: a common mode choke connected to between any one terminal at an input side, an output... | 10/20/2009 |
| 7570500 | Method and apparatus to improve regulation of a power supply Techniques are disclosed to regulate a power supply with a compensation signal generation circuit. One example regulated power supply includes a sense circuit coupled to sense an output voltage of the regulated power supply. The regulated power supply also includes ... | 08/04/2009 |
| 7561448 | Power inverter A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling ... | 07/14/2009 |
| 7542311 | Method for operating a converter circuit, and device for carrying out the method A method for operating a converter circuit is specified with the converter circuit having a converter unit with a multiplicity of controllable power semiconductor switches and having an energy storage circuit formed by two series-connected capacitors, in which the c... | 06/02/2009 |
| 7495938 | DC voltage balance control for three-level NPC power converters with even-order harmonic elimination scheme Three-level inverter and rectifier power conversion systems and space vector modulation (SVM) controls having even-order harmonic elimination for neutral voltage balancing with a predefined vector switching sequences for half-wave symmetry in open loop system operat... | 02/24/2009 |
| 7492616 | Modulation controller, method of controlling and three phase converter system employing the same The present invention provides a modulation controller for use with a three phase converter. In one embodiment, the modulation controller includes a three phase modulator configured to provide vector control signals for the three phase converter that generate a comm... | 02/17/2009 |
| 7489529 | Control circuit having frequency modulation to reduce EMI of power converters A control circuit having frequency modulation is used for reducing the EMI of a power converter. A switching circuit is couple to a feedback circuit to generate a switching signal for regulating an output of the power converter. A first oscillator is equipped to det... | 02/10/2009 |
| 7450405 | DC/AC converter with dampened LCL filter distortions A method is disclosed for operating a converter circuit, with the converter circuit having a converter unit with a plurality of drivable power semiconductor switches and an LCL filter connected to each phase connection of the converter unit, in which the drivable po... | 11/11/2008 |
| 7443129 | Quenching device for a converter bridge with line regeneration There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition pulses is connected with its three inputs to the phases of a three-ph... | 10/28/2008 |
| 7433213 | Thyristor power converter filter for excitation applications An exciter system for the field of a synchronous generator excitation is provided. The exciter system includes an AC power source; a three-phase thyristor bridge having six legs, the three-phase bridge being connectable with the AC power source, and being adapted to... | 10/07/2008 |
| 7420824 | Method of designing an RPWM inverter with unwanted harmonic elimination A method of designing a random pulse width modulation (RPWM) inverter with unwanted harmonic elimination, which first uses a Fourier analysis and a numerical analysis to eliminate the unwanted harmonic components, next uses the equal area approach to produce switchi... | 09/02/2008 |
| 7414866 | Method for smoothing input current to a power delivery system having regeneration capability A method for smoothing input current to a power delivery system having regeneration capability. The method comprises evaluating input current to an input converter of the power delivery system for a first fundamental cycle, and shifting a window relative to a wavefo... | 08/19/2008 |
| 7411802 | Method of converting a direct current voltage from a source of direct current voltage, more specifically from a photovoltaic source of direct current voltage, into a alternating current voltage An inverter is devised to avoid high-frequency voltages at input terminals and to allow good efficiency thanks to its simple and cost-optimized circuit layout. This is achieved by a method of converting a direct current voltage, more specifically from a photovoltaic... | 08/12/2008 |
| 7403404 | Power inverter system and method of correcting supply voltage of the same In a power inverter system, an inverter unit includes first to third single-phase inverters. In the power inverter system, a reference-frequency calculating unit calculates a reference frequency of each of the first to third single-phase inverters. A reference-volta... | 07/22/2008 |
| 7388766 | Harmonic control and regulation system for harmonic neutralized frequency changer A control and regulation system for use with a harmonic neutralization frequency changer system. In the generalized frequency changer system, a direct converter frequency changer is used to convert bulk power, but unwanted harmonics are introduced. Input and output ... | 06/17/2008 |
| 7385438 | Active filter for reduction of common mode current An active filter for reducing the common mode current in a pulse width modulated drive circuit driving a load said drive circuit comprising an a-c source, a rectifier connected to said a-c source and producing a rectified output voltage connected to a positive d-c b... | 06/10/2008 |
| 7382636 | System and method for powering a load A power supply for inductively powering a remote device has an inverter operating at an operating frequency and a primary coil. A phase comparator compares the phase of the voltage or current delivered by the power supply. If the phase relationship detected by the c... | 06/03/2008 |
| 7382112 | Methods and devices for input waveform control in switching power supplies The invention recognizes that filter size can be reduced substantially as power factor is permitted to deviate below unity in systematic ways. Preferred methods of the invention provide specific, computable waveforms that permit use of a minimum filter size given a ... | 06/03/2008 |
| 7365500 | Display device having lamp control circuit A driving device is provided, which includes: a switching unit directly connected to a first voltage from a source external to the driving device; a transforming unit indirectly connected to the switching unit for transforming the first voltage into a second voltage... | 04/29/2008 |
| 7362162 | Line filter The invention is directed to a network filter that comprises at least one phase input and a protective conductor in which each phase input is connected via a filter inductance to a corresponding phase output, in which the input side of each filter inductance is conn... | 04/22/2008 |
| 7359222 | Method and apparatus to improve regulation of a power supply Techniques are disclosed to regulate a power supply with a compensation signal generation circuit. One example regulated power supply includes a sense circuit coupled to sense an output voltage of the regulated power supply. The regulated power supply also includes ... | 04/15/2008 |
| 7348739 | Motor driving apparatus A motor driving apparatus makes a carrier signal of an inverter be synchronized with a carrier signal of a DC/DC converter, and determines a phase difference between both the carrier signals based on a ratio of an input voltage inputted to the DC/DC converter and an... | 03/25/2008 |
| 7340158 | Method and circuit configuration for controlling a polyphase brushless electric motor A method is specified for controlling a polyphase brushless electric motor, wherein the motor phase currents which are associated with the phases are produced by clocked variation of the respectively applied electrical potential. In this case, the motor phase curren... | 03/04/2008 |
| 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 |
| 7339801 | Switching power supply circuit The present invention provides a voltage resonant converter that achieves ZVS over the entire allowable load range. A switching power supply circuit includes a class-E resonant converter as its primary-side switching converter that is supplied with a DC input voltag... | 03/04/2008 |
| 7336052 | Device for powering a variable speed drive Variable speed drive comprising a main rectifier module (10) including thyristors (K1, K2, K3) to power a main continuous bus (15) from an external power network (5), an inverter module (30) delivering a variable cont... | 02/26/2008 |
| 7333352 | Frequency control and power balancing in disturbed power inverter system and method thereof A system and method are disclosed for controlling DC to AC power converters (inverters) that are operated as voltage sources and are paralleled on the AC side. This method allows for controlling frequency while sharing real power. The disclosed method requires no co... | 02/19/2008 |
| 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 |
