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7123494 |
Power factor correction circuit and method of varying switching frequency
A power factor correction (PFC) circuit ( 10 ) includes a pulse width modulator ( 31 ) operating in response to a clock signal (CLK) for switching a coil current (ICOIL) over a charging period...
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7117070 |
Power flow controller responsive to power circulation demand for optimizing power transfer
A power flow controller responsive to power circulation demand for optimizing power transfer is disclosed. When a power flow controller operates at its rated capacity, it can no longer regulate...
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7116010 |
Control of small distributed energy resources
A power electronics interface in a microsource controller allows efficient connection in a power system of small, low cost and reliable distributed generators such as microturbines, fuel cells and...
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7105952 |
Distributed floating series active impendances for power transmission systems
Floating electrically isolated active impedance modules are formed to attach to power transmission lines without breaking the lines such that the power line forms a secondary of the main...
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7091703 |
Dynamic reactive compensation system and method
The invention features a system for connection to a utility power network. The system includes a reactive power compensation device coupled to the network and configured to transfer reactive power...
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7092262 |
System and method for pre-charging the DC bus of a utility connected power converter
A system and method for pre-charging the DC bus of a utility connected power converter. In one embodiment, a full-wave rectifier circuit is coupled to the utility grid through an isolation...
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7091704 |
Three-phase three-wire active power filter
A three-phase three-wire active power filter includes a dc power capacitor, a power converter, a filter inductor set, a reactive power compensating capacitor set, a combined capacitor/resistor...
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7088079 |
Active power factor correction
An active power factor pre-converter having AC voltage input from a mains AC power supply and a DC output voltage, the pre-converter comprising adjustment means to adjust automatically, in...
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7088078 |
Soft-start circuit for power converters
A soft-start circuit for a power converter including a switch controlled to cause the soft-start interval for the converter to be terminated when a predetermined condition is fulfilled. The...
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7079405 |
Thermal conductive polymer molded article and method for producing the same
A thermal conductive polymer molded article is formed by molding a thermotropic liquid crystalline composition comprised mainly of a thermotropic liquid crystalline polymer, wherein the thermal...
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7075275 |
DC-DC converter
A DC-DC converter has switching means which generates a continuous switching voltage having a specified period from an input voltage and outputs the generated switching voltage, output voltage...
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7075274 |
Reactive power compensator
A reactive power compensator continues operation even when a higher harmonic wave component of an alternating-current power system increases. For an alternating current electric amount indicating...
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7057376 |
Power management system for vehicles
A power management system for a vehicle. The system may be flexibly configured using various arrangements of DC to AC inverters, DC to DC converters AC to DC converters, DC to AC converters and AC...
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7057375 |
Power factor correction
A circuit ( 1 ) used for power factor correction, corresponds to a known circuit that includes a high-frequency frequency source ( 15 ) for generating a high-frequency voltage (Uf) for a pump...
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7012409 |
Power converter circuit and associated triggering method for generators with dynamically variable power output
A power converter circuit and associated triggering method for connecting a three-phase generator to an electrical network. The circuit includes a first direct connection of the generator to the...
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7007176 |
System and method for highly phased power regulation using adaptive compensation control
A highly phased power regulation (converter) system having an improved control feature is provided. A controller, such as a digital signal processor or microprocessor, receives digital information...
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7002320 |
Power factor correction circuit with a coil
The switched-mode power supply according to the invention has a power factor correction circuit, which operates on the principle of a current pump and has a first coil for damping voltage spikes,...
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6987676 |
Power converter with power factor adjusting means
A power converter for operating with an alternate current power source, including a storage capacitive means and a transformer, said storage capacitive means being adapted for power factor...
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6984962 |
Device and a method for voltage control in an electric transmission network
A device for control of a compensator connected to a polyphase electric transmission network for reactive electric power in dependence on a voltage sensed in the transmission network. A voltage...
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6984963 |
Device for the correction of the power factor in power supply units with forced switching operating in transition mode
A device is described for the correction of the power factor in power supply units with forced switching operating in transition mode. Said device comprises a converter and a control device coupled...
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6984964 |
Soft-switching three-phase power factor correction converter
The proposed converter includes: three boost inductors, three filter capacitors, six main switch modules each having a switch element, a diode and a resonant capacitor, two auxiliary switches, two...
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6982547 |
Power factor controlled regulator with variable output voltage feedback
Active power factor correction (PFC) circuits are used to minimize unwanted harmonic distortion in applications where AC electrical power is rectified to produce DC power needed for operating...
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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...
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6977827 |
Power system having a phase locked loop with a notch filter
A power system having a phase locked loop (PLL) with a notch filter for synchronous reference frame sequence separation. The notch filter includes a generalized integrator tuned to the notch...
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6975524 |
Power factor control device
A power factor correction device comprising a rectifier ( 10 ) operable to receive an AC input voltage ( 100 ) and output a rectified voltage ( 110 ), and a first analog module ( 20 ) connected to...
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6969975 |
Circuit arrangement for power factor correction
Power factor correction circuit includes an input having a first and second connecting terminal, a first switching element with a control electrode coupled to a current source, a reference...
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6963187 |
Hybrid power flow controller and method
A power flow controller for controlling the flow of active and reactive power on an AC transmission line between an input and output includes first and second power converters, coupled to each...
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6952357 |
Power supply control apparatus
An electric power supply control apparatus, which starts an interruption process upon detecting a voltage lower than a predetermined voltage, then detecting the electric power supply voltage again...
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6952092 |
Watt power device
An energy savings circuit comprising a means for receiving an ac voltage source; a first voltage storage device in series with the ac voltage source; a second voltage storage device electrically...
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6949915 |
Opposed current converter power factor correcting power supply
A power factor correcting power supply includes an input stage power converter and an output stage power converter. The input stage power converter includes an opposed current converter and a power...
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6946819 |
Device for the correction of the power factor in power supply units with forced switching operating in transition mode
A device for the correction of the power factor in power supply units with forced switching operating in transition mode is described. The device comprises a converter and a control device coupled...
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6930895 |
Computer power supply
An object of the present invention is to provide a computer power supply in which, by improving the circuit itself, internal heat loss can be reduced, thereby greatly improving efficiency. A...
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6924630 |
Buck-boost power factory correction circuit
A buck-boost switching converter includes a soft-switching circuit coupled across the boost switch, controlled to establish a short-circuit across the boost switch prior to turn-on of the boost...
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6906431 |
Wind power system for Delivering constant apparent power
A wind power facility having a plurality of wind power installations, the wind power installations connected to a current voltage network into which the electrical current generated is fed or...
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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...
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6882550 |
Harmonic neutralized frequency changer
A power converter that produces variable frequency multiphase AC power from fixed or variable frequency AC power. The converter can be used to drive an AC motor for propulsion applications or other...
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6876179 |
Hybrid reactive power compensation device
A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive...
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6862199 |
Adaptive controller for d-statcom in the stationary reference frame to compensate for reactive and harmonic distortion under unbalanced conditions
A controller ( 130 ) for compensating reactive power and selected current load harmonics in an unbalanced multi-phase power distribution system. Control current is injected from a multi-phase...
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6861825 |
Hybrid AC/DC system for electric power transmission
A systematic, time-varying current is applied to any number of transmission conductors while the voltage on each remains at an essentially constant level but periodically reversed in polarity....
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6853167 |
Power supply system
A power supply unit includes a plurality of power trains and a control assembly. Each power train includes a power factor correction circuit that receives an AC input and generates a first DC...
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6819089 |
Power factor correction circuit with high-voltage semiconductor component
A switching power supply including a power factor correction circuit comprises a rectifier, an inductor coupled in series with the rectifier, a semiconductor switch formed by a compensation device...
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6809941 |
Power system having a power factor correction circuit
A power system having a power factor correction circuit includes a power circuit. The power circuit includes first and second input capacitors, first and second coupled inductors, first and second...
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6771522 |
Inverter parallel operation system
An inverter includes a DC power supply circuit, an inverter circuit having a plurality of switching elements and switching an output of the DC power supply circuit on the basis of a PWM signal to...
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6744241 |
Method for driving a switch in a switch-mode converter, and a drive circuit for driving a switch
The present invention relates to a method and to a drive circuit for driving a switch in a switch-mode converter that has input terminals for supplying an input voltage and output terminals for...
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6741482 |
Power conversion device
The power conversion device of the present invention comprises a power diode rectifier (REC) whose AC terminal is connected through an AC reactor (Ls) with an AC power source; voltage-type...
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6738274 |
Power supply with integrated bridge and boost circuit
An alternating current to direct current switching power supply, with power factor correction, and having an integrated rectifying bridge and boost circuit.
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6731524 |
Parallel connected DC regulators with power factor corrected rectifier inputs
A power system includes a plurality of power supply units (“PSUs”), each PSU having an output that is coupled to the output of other PSUs in the power system. Each PSU includes a power factor...
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6728121 |
Method and apparatus for active power factor correction with minimum input current distortion
A method for reducing the harmonics contents of an input current drawn from a power line into an electrical system without sensing an input voltage, the method comprising providing an active power...
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6714427 |
Current modulation of direct current transmission lines
A current-modulation method of transmitting high voltage direct current (HVDC) power over a transmission system comprising at least three conductors, wherein each conductor has a nominal thermal...
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6703718 |
Wind turbine controller
A wind turbine with a permanent magnet alternator that uses a boost mode controller to improve performance at low and high wind speeds. The boost mode controller also allows the permanent magnet...
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