Matches 201 - 250 out of 330 < 1 2 3 4 5 6 7 >
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5614811 Power line control system  
The present invention provides a system and a method for controlling electrical devices connected to an AC power line by means of control signals transmitted over the AC power line. The control...
5610501 Dynamic power and voltage regulator for an ac transmission line  
Apparatus for providing reactive compensation and positive real power compensation in an ac electric power transmission system, utilizes a solid state inverter to inject a series compensation...
5608295 Cost effective high performance circuit for driving a gas discharge lamp load  
A circuit for driving a gas discharge lamp load and including an EMI and transient supply filter coupled to an input source, a rectifier coupled to the filter, a power inverter coupled to the...
5586018 Device for suppressing voltage fluctuation and higher harmonics  
A device for suppressing voltage fluctuation and higher harmonics of a power source system which supplies power to a load with large power fluctuation and large harmonic current. The device...
5574356 Active neutral current compensator  
An active power conditioner for mitigating zero-sequence currents in electrical distribution by items wherein a multi-phase, neutral-forming structure employs a controllable voltage source, which...
5568041 Low-cost power factor correction circuit and method for electronic ballasts  
The present invention provides a low-cost power factor corrected electronic ballast circuit. A preferred embodiment includes a discontinuous conduction mode boost power factor correction circuit...
5537307 Control device for system interconnection inverter  
A control device for a system interconnection inverter. The control device includes an active/reactive current reference generator and an active/reactive current detector for detecting an output AC...
5526252 Utility current feedback filter with pulse-width modulated power converter  
A utility feedback filter for a self-commutated, pulse-width modulated power electronic converter. A feedback node is coupled to detect the utility current which is then utilized in a feedback loop...
5521487 Active filter for single-phase overhead contact wire energized locomotive  
An active filter for filtering the current and optionally improving the power factor of a single-phase overhead contact wire energized locomotive includes an arrangement for collecting the voltage...
5519306 Constant voltage circuit and a stabilized power supply unit  
A DC constant voltage circuit comprises a rectifier and a boosting chopper circuit controlled by a general purpose PWM control IC. The general purpose PWM control IC receives a reference voltage...
5502628 AC-DC converter  
An AC-DC converter is disclosed which is so designed as to realize an improved power factor and thereby minimize generation of voltage distortion and higher harmonies in power supply line, without...
5489837 AC-DC converter having improved power factor to control feedback signal corresponding to output voltage of constant control circuit  
An AC-DC converter of a type having an improved power factor having an arrangement that enlargements of loads to be borne by circuit components due to AC input voltage is prevented so that the size...
5485075 Reactive power compensating apparatus and method for reducing in switching loss in steady state operation thereof  
A self-commutated static var compensator and a method is used for stabilizing a power system by controlling an output of a self-commutated converter for receiving/supplying power from/to the power...
5483148 Single-phase active power filter for multiple nonlinear loads and method therefor  
An active filter and method for stabilizing a single-phase ac line to which multiple nonlinear loads are connected, comprises two pairs of switches connected in two switching loops across a...
5469044 Transmission line power flow controller with unequal advancement and retardation of transmission angle  
A bias voltage vectorially added to the controllable voltage injected in series with the line voltage of a transmission line reduces the required MVA rating for a unified power flow controller...
5461301 Dual slope soft start for pulse width modulator controllers used in power converters  
A power converter including a regulator responsive to a rectifier supplies a load with a regulated DC voltage. The regulator has a variable duty cycle output and responds to AC current and voltage...
5450311 Static energy regulator for lighting networks with control of the quantity of the intensity and/or voltage, harmonic content and reactive energy supplied to the load  
A static energy regulator for lighting in the form of a device that is inserted between the feed and the load has a converter, connected to the load and to a controller, so that the intensity...
5446646 Method and apparatus for control of pulse width modulation (PWM) converter  
A control method for a PWM converter which is connected to an AC current source via a reactor, and performs the sending and receiving of power between the AC power source and a DC power source,...
5438253 Static var generator using self-commutated inverter  
A static var generator using self-commutated inverter being able to resume its operation securely and smoothly immediately after a system grounding accident disappears and whose system can be...
5430364 Current harmonic, current form factor and power factor modification unit for rectifier supplied loads  
A device for connecting in series between a source of alternating current power and a direct current load which decouples the power flow from the source to the load and thereby enables efficient...
5406470 AC/DC converter  
An AC/DC converter is provided for connecting to conductors of a multi-phased alternating current generator or network, which is built redundantly for protection against a total loss and which...
5404093 Low distortion alternating current output active power factor correction circuit using capacitor coupled bi-directional switching regulator  
A circuit wherein a current sensing device is incorporated in an AC input line. An AC output is taken from the output of the current sensing device and from an other AC input line. Circuitry...
5404092 High power factor AC-DC converter with reactive shunt regulation  
A high power factor AC to DC converter with shunt regulation include first and second power converters for converting AC power to DC power; the first power converter receives and regulates input...
5391976 Power factor control arrangement for an OLS based on quarter cycle averaged power flow  
A power factor control system for a rectifier is operative through the generation of estimators of control input parameters (a peak squared input AC voltage E m 2 and load power) and by the use of...
5384696 Active power line conditioner with fundamental negative sequence compensation  
An improved active power line conditioner is disclosed. A series inverter is controlled by a series filter controller which performs synchronous transformations on a load current to generate a...
5371664 Line-commutated and self-commutated combined power conversion system  
The power conversion system of this invention comprises line-commutated power converting means in which a line-commutated power conversion circuit that performs line-commutated commutation and a...
5369353 Controlled electrical energy storage apparatus for utility grids  
A controlled electrical energy storage apparatus for selectively storing electrical energy from an electrical grid, and selectively releasing the electric energy back into the grid. The apparatus...
5367448 Three phase AC to DC power converter  
A three phase AC to DC converter has an AC driven regulated current source, and it is provided with an unregulated current controller inverter. The zero crossing of the AC voltage input is...
5367246 Electronic energy saving device  
An automatic power factor correcting device for correcting the power factor of a load connected to a power line having a plurality of confuctors including a neutral conductor, a power line...
5359275 Load current fundamental filter with one cycle response  
An apparatus and method of constructing a sinusoidal output signal corresponding to a predetermined harmonic component of a sinusoidal input signal is described. The input signal is multiplied by a...
5359276 Automatic gain selection for high power factor  
A high power factor regulator circuit which includes a variable multiplier, permitting the high power factor regulator circuit to be used with a number of input line voltage levels. In one...
5359274 Active offset for power factor controller  
A switch mode power supply for a ballast having a power factor controller and providing a regulated D.C. output voltage. The controller is responsive to a control input signal which includes a...
5355294 Unity power factor control for dual active bridge converter  
A dual active bridge converter, including high-frequency transformer-coupled input and output bridge converters, receives a rectified ac line voltage via a rectifier acting in a resistive mode and...
5355025 Active power line conditioner with synchronous transformation control  
An improved active power line conditioner is disclosed. The active power line conditioner includes a series inverter coupled to an energy input source, and a parallel inverter coupled to a...
5351180 Highly fault tolerant active power line conditioner  
An improved active power line conditioner is disclosed. The active power line conditioner includes a series inverter coupled to an energy input source, and a parallel inverter coupled to a...
5351178 Active power line conditioner with a derived load current fundamental signal for fast dynamic response  
An improved active power line conditioner with fast dynamic response is disclosed. The active power line conditioner includes a series inverter coupled to an energy input source, and a parallel...
5349283 Automatic voltage control circuit by using reactive power  
An automatic voltage control circuit by using reactive power is disclosed. The circuit comprises a proportional integrator, a triangular wave generator, a comparing circuit having first and second...
5349517 Active power line conditioner utilizing harmonic frequency injection for improved peak voltage regulation  
The present invention provides an active power line conditioner (APLC) which has improved peak voltage regulation capability when compared with similarly-sized devices constructed according to...
5349284 Power factor boost converter power supply  
A boost-type power factor correction circuit is disclosed in which output voltage of the convertor is proportional to the peak input voltage. To achieve this, the circuit includes a peak rectifier...
5345377 Harmonic controller for an active power line conditioner  
An apparatus and method of constructing a sinusoidal output signal corresponding to a selected harmonic of a sinusoidal input signal is described. The input signal is deconstructed into direct and...
5343139 Generalized fast, power flow controller  
First and second dc linked, preferably voltage sourced, inverters are connected to an electric power transmission line in shunt and in series, respectively, by coupling transformers. Firing of the...
5329222 Apparatus and method for dynamic voltage restoration of utility distribution networks  
A system and method is provided compensating utility distribution line transients such as voltage sags in a dynamic manner, by inserting a voltage signal in series with the distribution signal...
5329439 Zero-voltage-switched, three-phase pulse-width-modulating switching rectifier with power factor correction  
A three-phase, pulse-width-modulated, switching rectifier, with zero-voltage-switching.
5329221 Advanced static var compensator control system  
An advanced static VAR (volt ampere reactive) compensator (ASVC) system for coupling with and compensating a transmission line of a power system includes an ASVC controller. A voltage-sourced...
5321598 Three-phase active filter utilizing rotating axis transformation  
A three-phase active filter for connection into a three-phase power distribution system to compensate undesirable harmonic deviations. A converter is electrically connected between the power...
5319300 Error compensating circuit for power consumption meter  
An electrical power consumption error correction circuit for use with 220 volt ac power meters, or with 220 volt ac power supplies, of the type designed to reduce inaccurate energy use measurements...
5319534 Series-parallel active power line conditioner utilizing reduced-turns-ratio transformer for enhanced peak voltage regulation capability  
The present invention provides an improved active power line conditioner which achieves a significant improvement in peak voltage regulation capability when compared with a similarly-sized device...
5319535 Active power line conditioner having capability for rejection of common-mode disturbances  
The present invention provides an APLC which has improved common-mode disturbance rejection capability when compared with similarly-sized devices constructed according to current teachings. The...
5309346 Transmission line fault current dynamic inverter control  
A fault current surge bypassing and transitional impedance compensation system for preventing subsynchronous currents on electrical power lines, with parallel lines being protected from the...
5302906 Method and arrangement for determining a load angle of a generator which is connected to an electrical supply network  
In an electrical supply network containing a generator, critical fluctuations in real power can occur. The load angle of the generator is representative of these fluctuations. The present invention...
Matches 201 - 250 out of 330 < 1 2 3 4 5 6 7 >