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8547072 Phase control apparatus  
A phase control apparatus includes a first transistor whose source or emitter is connected to one end of an AC power supply and whose drain or collector is connected to one end of a load, a second...
8502487 Motor energy recycling device  
A motor energy recycling device is connected to a motor, a voltage regulating power capacitor, and a switch unit, for storing energy released by the motor. The motor energy recycling device...
8487593 System and method for detection and compensation of aggressive output filters for switched mode power supplies  
A controller for a switched mode power supply converting an input voltage to a regulated output voltage according to one embodiment includes a control network and a detection network. The control...
8207699 Method and apparatus for AC motor control  
An alternating current motor control system constituted of: a control unit; a cycloconverter functionality; a phase control functionality; and a semiconductor switching unit comprising a plurality...
8120306 Voltage source inverter with a voltage offset  
Methods and apparatus are provided for operation of a voltage source inverter. A method of operating a voltage source inverter having an output with multiple voltage phases having a DC voltage...
8084974 Inverter device  
There is provided an inverter device capable of simplifying the circuit structure, lowering the cast, and downsizing of the device. The inverter device detects a switching change of an inverter by...
7956588 Voltage regulator  
A voltage regulator has an error amplifier circuit, and a phase compensation circuit having a capacitor connected in parallel to first and second series-connected resistors. A control transistor...
7952309 Rotating electrical machine control device  
A rotating electrical machine control device includes an inverter; a resolver; a unit; a three-phase/two-phase modulation switching unit; and a motor control unit that switches to a two-phase...
7898224 Method for switching low-power using AC and system for performing the same and power supply for using the system  
A power control method using AC power, the method being capable of performing: low power control that passes only two portions of positive direction waves of each one-cycle sine wave of the AC...
7893664 Power consumption reduction of a power supply  
A power supply includes a first switch to establish a first path to charge an output of the power supply by a voltage source, a second switch to establish a second path to discharge the output,...
7696730 Control apparatus for AC-AC converter  
A control apparatus for an AC-AC direct converter. The control apparatus includes a calculator providing a phase command θ* of an output voltage of the converter, a calculator providing a q-axis...
7486054 Method for generating a reading signal of a sense element comprised into at least a phase of a multiphase controller  
A method for generating a reading signal of a sense element in at least a phase of a multiphase controller controlled by means of PWM control signals having a preset period and a duty cycle...
7224130 Method of operating a lamp containing a fixed phase power controller  
A method of operating a lamp that has a power controller connected between a terminal and a light emitting element that converts the line voltage to an RMS load voltage. An input to an analog...
7034473 Phase-control power controller for converting a line voltage to an RMS load voltage  
A phase-control power controller that converts a line voltage to an RMS load voltage includes a phase-control circuit connected to the line and load terminals and having an RC network that clips...
7034510 Method for coupling inverter to alternating voltage  
A method for coupling an inverter to an alternating voltage source, the inverter comprising a current controller, which controls phase currents and implements reference current. The method...
7002396 Frequency converter  
A frequency converter includes a transistor pair having a first transistor and a second transistor respectively having collector terminals commonly connected to each other and emitter terminals...
6759834 Phase-shift modulation resonant inverter  
A phase-shift modulation resonant inverter is turned on and off by built-in switches Q1 and Q2. An inductor L and a load capacitor C are used to produce vibration output from the inverter. A...
6373479 Power supply apparatus of an LCD and voltage sequence control method  
A power supply for an LCD and a voltage sequence control method in which the sequence for voltages applied to a gate driver IC for outputting a driving voltage of an LCD panel is controlled by...
6333863 Method to compensate for unbalanced loads in polyphase systems  
The method according to the invention is for compensation currents to be produced which have arbitrary phases and/or arbitrary amplitudes. To this end, a compensation unit (5) is proposed which is...
6327162 Static series voltage regulator  
A static series voltage regulator (SSVR) for an electric power distribution system protects a load on a feeder branch from voltage dips by boosting voltage under certain conditions. The SSVR...
6177782 Circuit and method of controlling a regulator with an output feedback signal and devoid of an input feedforward signal  
A power factor correction controller circuit 100 for controlling the duration of each on time phase and off time phase of a switched inductor power factor correction circuit 20, 30, 40, 50, 100...
6046915 Phase selection circuit for three phase power converter and method of operation thereof  
An active circuit for delivering three phase AC input power received from a three phase rectifier to a boost converter and a method of operating the same. In one embodiment, the active circuit...
5995391 Control arrangement for a multilevel convertor  
A control arrangement for a multilevel convertor employs an AC reference signal which is locked to the AC system frequency and is compared with a number of DC threshold levels. Intersections of...
5892352 Synchronization of the switching action of hysteresis current controlled parallel connected power electronics systems  
A method and apparatus for operation of an electrical power conversion system having first and second partial systems connected in parallel. Each partial system includes an inductor and an...
5883500 Three-state monolithic static switch  
A three-state switch designed to be inserted in an ac supply circuit and associated with a state selection circuit. In a first state, the switch is open and does not allow current to flow. In a...
5869800 Phase distortion compensated time base for a welder control  
A phase controlled weld controller system provides a stable timebase phase reference which has improved transient response in the presence of spurious noise generated by other external equipment...
5777864 Resonant converter control system having resonant current phase detection  
A resonant convertor control system regulates a resonant AC current based on the amount of input power consumed by the system. The switching frequency and resonant AC current are limited by a...
5736840 Phase shifter and communication system using the phase shifter  
A local signal of a predetermined frequency is supplied to an input terminal of a local signal input section. The local signal is applied to a control input terminal of a variable current supply...
5675476 Phase controlled bridge  
A phase controlled 50 percent duty cycle variable output bridge power converter in which the 50% duty cycle is maintained constant while power output is controlled by changing the phase...
5650714 Orthogonal signal generation system  
A local signal of preset frequency is supplied to an input terminal of a signal input section. The local signal is supplied to a control input terminal of a variable current source, a current...
5528124 Phase control circuit having a plurality of differential circuits  
A phase control circuit for operating a phase shift in accordance with a control voltage comprises four differential circuits, two of which form a multiplier circuit for providing a basic function...
5461300 Phase angle regulating transformer with a single core per phase  
A dynamic phase angle regulator for enhancing the transient stability of a three phase AC power system includes a controller, a switching assembly of thyristor switches, and a single transformer...
5432430 Phase shifting circuit and method for generating several output signals of different phases  
The present invention discloses a phase shifting circuit for generating several output signals wherein each of the output signals maintaining a constant phase difference. The phase shifting...
5138205 Synchronized thyristor firing control  
The invention pertains to electrical power control more particularly to a class of circuitry known as thyristor phase control. The novel circuit can be used to control heating devices, electrical...
4954765 Fully automatic phase controller for a non-coil armature type generator  
A fully automatic phase controller for non-coil armature type generator includes a starting control circuit and an automatic voltage control circuit, to fully automatically control the phase...
4906860 Control device for active filter  
A control device for an active filter according to the present invention comprises a ROM circuit for producing output signals sin θ and cos θ from a phase signal generated from a PLL circuit, a...
4792744 Arrangement for shifting the phase of a signal passed through two parallel branches with one branch having a phase shifting network  
A circuit arrangement for shifting the phase of a signal, in which the signal is applied to two parallel branches where one branch contains a phase-shifting network for purposes of applying a...
4737703 Variable phase shifting circuit  
A variable phase shifting circuit comprising a phase splitter for distributing an input signal supplied thereto into first and second output signals which are outputted therefrom and 90 degrees...
4672299 Clock control circuit for phase control  
There is disclosed a clock circuit for a PBX system that uses phase locked loop technology to perform synchronization between two input signals. The system can switch between different reference...
4663583 Automatically variable phase characteristic all-pass circuit  
An automatically variable all-pass circuit includes a variable impedance circuit for changing the shape of the phase characteristic of the output signal of the all-pass circuit as a function of...
4661763 Phase shifter  
Phase shifters are used in meshed, multi-phase power supply systems for improving their transmission stability and for load-flow regulating purposes. In order to be able to use a less costly...
4578629 Monolithic microwave "split load" phase inverter for push-pull monolithic FET amplifier circuits  
A phase inverter generates two signals 180° out-of-phase at microwave frequencies in response to an input microwave signal incorporating a semiconductor substrate such as gallium arsenide, a...
4456871 Power supply for electronic control system  
An inexpensive power supply for an electconic control system or the like which is capable of converting a wide range of applied AC voltages into a regulated output voltage. A thyristor is coupled...
4449054 Electronic circuit for controlling the supply voltage of electromagnets, electric motors, resistors, in single- and three-phase systems  
The control circuit comprises a solid state controlled switch coupled to a terminal of the mains and a terminal of the load the supply voltage whereof has to be controlled, and a non controlled...
4355241 Means for damping subsynchronous oscillations in an AC power system including overload protection  
Reactance means serially connected in a power line is shunted by selectively bidirectional conduction means which is triggered in response to half-cycle time periods of current waves exceeding a...
4336488 Transformer for the controllable shifting of the phase angle of output voltages in relation to the phase angles of input voltages  
A transformer which is suitable for connecting with a compound network and renders possible shifting the phase angle of the secondary side-output voltage in relation to the primary side-input...
4321662 Power supply circuit for electrical apparatus  
In a power supply circuit for an electrical apparatus, comprising a power transformer having its secondary winding connected to a smoothing capacitor via a rectifying circuit and having its...
4302716 Controllable phase shifter  
Controllable phase shifters containing reactances and valve switching devices are used for compensation and stabilizing purposes in alternating current-energy transmission systems. There is...
4255701 Variable phase shift apparatus  
Variable phase shift apparatus employing two transistors having their bases connected together and their collectors connected together. The input terminal is coupled to the emitter of the first...
4173749 Digital drive and phase-lock for seismic vibrators  
This invention concerns a synchronizing control for an electro-hydraulic seismic vibrator, which control utilizes a magnetic tape cassette reader that puts out a train of pulses of changing time...

Matches 1 - 50 out of 71 1 2 >