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7546473 |
Dimmer having a microprocessor-controlled power supply
A power supply for a two-wire load control device supplies power to a microprocessor, which in turn controls the power supply. The power supply comprises an energy storage element, e.g., a...
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7514907 |
Device, system, and method for providing a low-voltage fault ride-through for a wind generator farm
A device, a system, and a method for preventing power-producing wind turbine generators from tripping due to the detection of a low-voltage condition on a power grid are disclosed. The disclosed...
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7489115 |
Method in an electric net data transmission system for keeping the signal level constant in a coupling furnished with supply cable
Method in low voltage net data transmission system for keeping the signal level of transmission constant on the net voltage rail or on wall outlet. In the method the feedback signals are taken...
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7402989 |
Capacitor multiplier
A capacitor multiplier including a capacitor, a first voltage follower, a first impedance element, and a second impedance element is provided. The input terminal of the first voltage follower is...
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7402990 |
Reduction of energization transients in a three phase power system
A method and an apparatus for reducing energization transients in a three phase AC power system which includes an electrical device having legs A, B and C associated with corresponding phases of...
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7323213 |
Apparatus and method for discharge surface treatment
An apparatus has a green compact electrode including a material of a coating formed on a workpiece by a discharge, a power source for supplying a first voltage, a voltage detector for detecting a...
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7317301 |
Auxiliary power supply
An auxiliary power supply equipment for a high voltage installation includes a power source at ground potential, a load circuit at high potential, and a transmission link for coupling the power...
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7307362 |
Solid-state microsecond capacitance charger for high voltage and pulsed power
A solid-state high-voltage pulse generator based on a three-phase chopper capacitance charger is described. In a first phase, an intermediate capacitor is resonance-charged via a diode. In a second...
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7253403 |
Control system for a power supply
A control system ( 12 ) for a power supply ( 14 ), such as a high voltage power supply, includes a control circuit ( 16 ) and a feedback circuit ( 18, 28, 30 ). The feedback circuit ( 18, 28, 30 )...
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7091872 |
Controlled power source for underground line location
A transmitter for a line locator system that controls the electrical current, voltage or power applied to the target line is disclosed. Control of the electrical output of the transmitter can be...
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7042198 |
System using a power converter
EMI noise in a system using a power converter with switching control is reduced in a simple configuration. The power converter 3 includes a converter 31 , a smoothing capacitor 32 , and an...
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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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6982546 |
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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6906434 |
Electric utility system with superconducting magnetic energy storage
a voltage recovery device is configured to provide real and reactive power to a utility power network at a sufficient level and for a sufficient duration to recover the voltage on the utility power...
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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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6801022 |
Universal electrical energy saver
A universal electric energy saver to recuperate power losses comprised of a bank of condensers connected in parallel; a bank of resistors with some connected in parallel while others are connected...
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6783795 |
Power supply apparatus for discharge surface treatment
In a power supply apparatus for discharge surface treatment which uses a green compact electrode as a discharge electrode, allows a pulse-type discharge to take place between said discharge...
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6693409 |
Control system for a power converter and method of controlling operation of a power converter
A control system ( 20 ) for a power converter ( 22 ) designed to convert DC power from a source ( 30 ) such as a battery, flywheel or fuel cell into AC power. The control system includes an...
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6690143 |
Power factor correction circuit with resonant snubber
A power factor correction (PFC) circuit with a resonant snubber. The power factor correction (PFC) circuit has an input part ( 601 ) for receiving an AC voltage and outputting a first DC voltage; a...
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6653822 |
Circuit for converting AC voltage into DC voltage
A circuit for converting AC voltage into DC voltage for one or two devices (Rm, Ra), includes a first part of the current being fed to the input side via a large induction coil (L 50 ) and a first...
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6483501 |
Load current compensated type voltage sampling circuit
A load current compensated voltage sampling circuit is characterized by a sampling voltage that is compensated by utilizing different load current values of the detected sample as parameters for...
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6371265 |
Electric railway vehicle and an electric powering unit in particular for such a vehicle
An electrical power supply unit powers a load, in particular a transformer ( 8 ), from a power source ( 10 ) via electrical switchgear ( 14 ), in particular a circuit-breaker, and it includes an...
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6359423 |
Method and system for suppressing a voltage fluctuation in a power system
A system for compensating a voltage fluctuation in a transmission line of a power system is such that a power detection circuit detects a voltage and power flow in the transmission line involving a...
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6343024 |
Self-adjustable impedance line driver with hybrid
A pair of equivalent controlled impedance buffers are connected in a push-pull configuration to a transformer primary coil. A pair of equivalent pre-drivers are connected to the pair of buffers....
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6091612 |
Universal power supply for arc welder
A single phase power supply for electric arc welders comprising: a full wave rectifier forming the input of said power supply; a valley fill power factor correcting circuit for controlling input...
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6069469 |
Controller for power converter
The controller for a power converter of the present invention, connects a transformer in series with the AC system, and has devices which find the voltage drop portion generated by the impedance of...
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6008548 |
Programmable logic controller for resonance control in complex capacitor switching
A system for regulating the voltage by switching capacitor banks and for preventing damage due to harmonic resonance in an AC power supply line after a capacitor bank is switched. The system...
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5927598 |
Energy management method and apparatus
An energy management system designed to reduce the costs of electrical energy particularly applicable to service businesses such as restaurants, service stations, convenience and grocery stores and...
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5818126 |
Power transfer controller
A method and apparatus for controlling power transferred and regulating voltage in a multi-phase transmission line includes generating a first plurality of voltages, a second plurality of voltages...
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5801460 |
Electrical power transmitting system with reduced feeder size and method of operation
An electrical power transmitting system (50) in accordance with the invention includes an alternating current electrical power generator (12) for producing alternating current on an output having a...
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5708353 |
Device for detecting the short circuiting of the switches of a converter circuit arrangement
A device for detecting the short circuiting of the switches of a converter circuit arrangement is disclosed. The device is magnetically coupled to the current limiter coil and comprises a conductor...
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5666277 |
Series-compensated converter station
A series-compensated converter station in an installation for transmission of high-voltage direct current is connected to an alternating-voltage network (N) with three phases (A, B, C,...
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5570006 |
A.C. storage module for reducing harmonic distortion in an A.C. waveform
A circuit for correcting perturbations in a power system signal operating at a system line frequency includes a capacitor for drawing a capacitive current and a first inductor for drawing an...
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5548203 |
Capacitor polarity-based var correction controller for resonant line conditions and large amplitude line harmonics
The invention is a static VAR compensator (SVC) which provides optimized power factor correction in the presence of resonant line conditions and large amplitude harmonics. A gate drive signal is...
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5532917 |
Power factor corrected rectifying circuit
A power factor corrected rectifying circuit is disclosed. The invention may be implemented using only passive elements and, in such an embodiment, achieves a power factor of about 80%. The...
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5434496 |
A.C. induction devices having compound resistive coupling of tuned reflux winding to neutral or electrical ground
Single and polyphase a.c. induction devices, such as: motors, generators, transformers, welders, ballasts, etc. are so wound as to maximize performance and efficiency. For each phase of such device...
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5424626 |
Tuned A.C. power systems compensator having variable reflective impedance for linear and non-linear reactive load compensation
The present invention provides means to instantaneously optimize reactive kva for an a.c. power system containing both linear and non-linear reactive loads. The preferred means utilizes a reflux...
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5399955 |
Power factor improving arrangement
An impedance compensator for adjusting the power factor of a power distribution system by directly measuring impedance at a point in the power distribution system and dynamically adjusting that...
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5355076 |
Phase controlled capacitor for series compensation of a high voltage transmission line
A compensating circuit arrangement for a power transmission system for rapidly inserting capacitance into a transmission line for desired portions of cycles of the operating frequency of the...
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5349666 |
Reduced power line fluctuation/noise circuit by increasing impedance level when number of bus lines simultaneously change state exceeds the predetermined number
A microcomputer that reduces through current of output buffers, and thus, reduces power line fluctuation that occurs when a large number of the bus lines connected to output buffers change state at...
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5345164 |
Power factor corrected DC power supply
An improved power factor DC power supply in accordance with the present invention (100 or 200) employs a power factor correcting network ( 120), a full-wave rectifier means (122), a pair of filter...
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5293110 |
Bridge capacitor bank installation
A capacitor bank installation for generating reactive power in high or extra high voltage electrical power systems, for example 345kV, to maintain the voltage level during heavy loading conditions...
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5227962 |
Filter and power factor compensation network
A filter network adapted to be placed in parallel with a power supply which provides a high impedance to the 60 Hz utility frequency but acts like a short circuit to all higher frequencies. The...
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5224029 |
Power factor and harmonic correction circuit including ac startup circuit
A circuit for correcting power factor and for reducing ac line current harmonic components in conjunction with bridge-connected capacitive-filtered loads and for providing a source of ac startup...
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5148360 |
Fourth order damped lowpass filter for obtaining high power factor and low total harmonic distortion
An arrangement includes a network for connection between an AC power supply and the input of a DC power supply containing rectifiers and a filter capacitor. The network forms a fourth order, damped...
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5148359 |
Network for obtaining high power and low total harmonic distortion
An arrangement includes a network for connection between an AC power supply and the input of a DC power supply containing rectifiers and a filter capacitor. The network forms a third order, damped...
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5105327 |
AC power conditioning circuit
A power conditioner for AC power lines has a choke and capacitor coupled in series across the power lines. The choke comprises a coil terminating in a line, with the line looped back through the...
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5051685 |
Waveform corrector
A waveform corrector for providing correction to three-phase electrical power to correct for transient and harmonic distortion arising from electrical power cable reactance wherein the cable head...
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4970656 |
Analog drive for ultrasonic probe with tunable phase angle
The system uses a tunable inductor in series with the piezoelectric crystal excitation transducer in the probe which has a flux modulation coil. The bias current through this flux modulation coil...
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4961044 |
Power factor correction circuit for power supplies
A power factor correction circuit for an AC to low voltage DC power supply designed to be connected to a source of AC power includes a linear transformer having primary and secondary windings, and...
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