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Vladimir Zworykin, television pioneer ; Talking about an invention in which he played a critical role.
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| Number | Title | Issue Date |
| 7923974 | Modification of switch activation order in a power supply A power supply system includes multiple power converter phases. A controller (e.g., a processor device) monitors energy delivery for each of multiple power converter phases that supply energy to a load. The controller analyzes the energy delivery associated with eac... | 04/12/2011 |
| 7906924 | Wide dynamic range motor control system and method Methods and systems are provided for controlling a discretely commutated, multi-phase DC electric motor or actuator is used. The methods and systems may be used for motor or actuator applications where accurate, high resolution torques may be need over a relatively ... | 03/15/2011 |
| 7808216 | Phase shift circuit and backlight unit having the same Disclosed is a phase shift circuit. The phase shift circuit comprises a frequency multiplier outputting a square wave signal by frequency-multiplying a reference signal, a frequency synchronizer receiving the square wave signal to output a triangle wave signal, and ... | 10/05/2010 |
| 7342372 | Method for power control of an electric motor The invention relates to a method for power control of an electric motor, in particular a motor for driving the suction fan of a vacuum cleaner connected to an AC mains power supply. The power control is effected by varying the phase angle of the electric alternatin... | 03/11/2008 |
| 7272880 | Distributed load edge clamp An arrangement for clamping a flat plate to a flat surface includes juxtaposing the plate to the flat surface. An axially-movable wedging element defining a surface fitted with wedges is fixed against motion in other than a direction of elongation, and is forced to ... | 09/25/2007 |
| 7204921 | Vacuum apparatus and vacuum processing method A vacuum apparatus which can easily regenerate plasma is provided. A matching box used in the vacuum apparatus can vary the impedance thereof by varying the magnitudes of the inductance of variable inductance elements. Controlling the magnitude of direct current mak... | 04/17/2007 |
| 7184900 | Method of measuring a monophase voltage The present invention is related to a method for measuring the instantaneous value of a monophase AC voltage signal Ve, comprising the steps of: applying said voltage signal Ve to a first input of a phase comp... | 02/27/2007 |
| 7173834 | Half-controlled silicon-controlled rectifying system and method thereof A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the c... | 02/06/2007 |
| 7173503 | Multibit phase shifter with active and passive phase bits, and active phase bit therefor An RF phase shifter includes the cascade of active and passive RF phase shift bits, having different phase increments. The active phase shift bit includes a FET with source and drain. First and second RF single-pole, double throw switches have their common elements ... | 02/06/2007 |
| 7161332 | Removing a phase in multiphase DC/DC converter without disturbing the output voltage A phase removal control system for a multiphase DC/DC converter including combination logic, disable logic, and a current detector. The multiphase DC/DC converter includes first and second output phase circuits and a controller providing first and second PWM signals... | 01/09/2007 |
| 7049774 | Apparatus for controlling power factor compensation in inverter control circuit and method thereof The present invention provides an apparatus for controlling power factor compensation and method thereof, in which a turn-on timing point of a power factor compensation switch is delayed by a prescribed time from a zero crossing timing point to enhance a power facto... | 05/23/2006 |
| 7023182 | Activating a phase in a multiphase DC/DC converter without disturbing the output voltage A phase activation control system for a multiphase DC/DC converter including an amplifier circuit and enable logic. The converter includes a first phase circuit providing a first PWM signal and has a reduce input for reducing duty cycle of the first PWM signal. The ... | 04/04/2006 |
| 7002103 | Welding-type power supply with a state-based controller A method and apparatus for providing welding-type power includes a source of welding-type power and a controller. The controller is a state-based controller, and/or a deterministic control module, connected to the controller output. The state-based control module in... | 02/21/2006 |
| 6997935 | Resonant converter tuning for maintaining substantially constant phaco handpiece power under increased load A phacoemulsification system includes a phacoemulsification handpiece including a cutting tip ultrasonically vibrated by an ultrasonic transducer. A power supply is provided for driving the ultrasonic transducer at a resonant frequency of the transducer and cutting ... | 02/14/2006 |
| 6958665 | Micro electro-mechanical system (MEMS) phase shifter A micro electro-mechanical system (MEMS) phase shifter for shifting the phase of a radio frequency (RF) signal. The phase shifter includes a quadrature coupler having an input port, an output port, a first load port and a second load port. A first variable reactance... | 10/25/2005 |
| 6900601 | Control circuit of two current unidirectional switches A circuit for controlling two switches assembled in anti-parallel, comprising in series between two terminals of the anti-parallel assembly, two identical control stages respectively dedicated to each switch and between which is interposed a common impedance setting... | 05/31/2005 |
| 6819059 | Flash strobe power supply system and method A reliable strobe power supply is disclosed that provides requisite light energy for emergency uses without causing EMI problems. A two phase dual flyback power converter operating in transitional mode is disclosed containing a microcontroller that maintains a 180 d... | 11/16/2004 |
| 6600294 | Switched reactance phase shifters A phase shifter is disclosed in which parasitic elements in a microelectromechanical system (MEMS) switch are designed and utilized to provide a predetermined phase shift. In one embodiment, a circuit containing three MEMS switching modules, each of which... | 07/29/2003 |
| 6448745 | Converter with inductor and digital controlled timing An apparatus and a method for controlling a converter of electronic power supply energy embodied for example as a boost converter or as a boost converter with a power factor correction (PFC) or being used as a DC to DC converter that is running in a disco... | 09/10/2002 |
| 6154709 | Method for determining the load capacity of an AC network In low-power AC networks, it is desirable when a load is connected, for example an arc furnace or a vehicle, to know the load capacity of the AC network in order to avoid undesirable drops in the network voltage UN. To this end, load voltage si... | 11/28/2000 |
| 6020659 | Ramping electronic switch system The present invention relates to an electronic switch system for controlling AC power to a load. The switch has ON, OFF and RAMP down modes that can be selected by means of momentary touch switches. When put into the RAMP down mode, the power to the load ... | 02/01/2000 |
| 5963022 | Method and apparatus for compensating phase distortion caused by a high impedance voltage source A phase control system has a stable timebase phase reference generated by an internal phase reference generator. The control includes a method for estimating and compensating phase distortion when an inductive load is driven by an AC voltage source having... | 10/05/1999 |
| 5955794 | Method and arrangement for controlling the output of a load connected to an ac line voltage A method and arrangement for controlling the output of electrical consumers connected to ac line voltage, especially of electric motors and the like, in which the output is changed by changing the phase control of the electric alternating magnitude suppli... | 09/21/1999 |
| 5789870 | Low noise inverter for EL lamp An EL lamp is charged to a first polarity with a series of high voltage pulses, discharged at a controlled rate, charged to a second polarity with a series of high voltage pulses, and discharged at a controlled rate, thereby producing an alternating curre... | 08/04/1998 |
| 5734257 | Transmission line power controller with a continuously controllable voltage source responsive to a real power demand and a reactive power demand A transmission line power controller for controlling the flow of electric power in an alternating current three-phase transmission system is described. The power line controller includes a parallel inverter connected to a series inverter through a dc link... | 03/31/1998 |
| 5686768 | Emergency power system An emergency power system is connected between an AC voltage source and a load. The emergency power system ensures a stable voltage on the output, even if the AC voltage received from the AC voltage source is irregular or is interrupted briefly. The emerg... | 11/11/1997 |
| 5619119 | Method of phase-shifting voltages applied to susceptances interconnecting two synchronous polyphase AC networks and a phase-shifting interconnecting apparatus thereof A phase-shifting interconnection apparatus for interconnecting respective phase lines of first and second synchronous polyphase AC networks, includes for each pair of respective phase lines subjected to an interconnection a pair of circuit branches in par... | 04/08/1997 |
| 5539655 | Apparatus for detecting out of phase of power systems and method for detecting the same An out of phase detecting apparatus according to the present invention includes a measurement unit for measuring an effective power and a current effective value at a tie point of power systems at a predetermined cycle, a power trend detection unit for de... | 07/23/1996 |
| 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 for a phase shift operation of the phase control circuit, ... | 06/18/1996 |
| 5450001 | Process and device for safeguarding an alternating current circuit having an electrical load associated therewith A device runs a precheck of an inductive load for an overload prior to swhing on to supply mains. For this purpose, following switching-on for a load precheck, initially a phase limited voltage signal is applied to the load, whereby the voltage signal du... | 09/12/1995 |
| 5434497 | Vernier enhanced control for shunt connected thyristor-controlled capacitors A firing controlled scheme including a method and apparatus for vernier operation of a shunt-connected thyristor-controlled capacitor (STCC) uses phase controlled firing of the thyristors based on monitored line voltage, monitored thyristor current, and a... | 07/18/1995 |
| 5406495 | Substation load distribution monitor system The monitoring and control system of the present invention provides a distributed intelligence, data acquisition and control system which collects and analyzes large amounts of data representing power usage from a power distribution substation. Using a Di... | 04/11/1995 |
| 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 interface circuit for interfacing the device with the power line, ... | 11/22/1994 |
| 5349522 | Method and apparatus for controlling the output voltage of an AC electrical system An AC system having, for example, a voltage source, an inductance and a load has connected thereto an apparatus for controlling the phase and amplitude of the voltage of the system. The instantaneous current and voltage in the AC electrical system are mea... | 09/20/1994 |
| 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 inverter has an AC side coupled through a series inductance to ... | 07/12/1994 |
| 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 provides a method which measures the real and reactive po... | 04/12/1994 |
| 5165049 | Phase difference control circuit for induction furnace power supply A control system for power delivered to an inductive load includes automatic control with a manual override for emergency situations. The system monitors the power delivered to the load and varies the power delivered to the inductive load by controlling t... | 11/17/1992 |
| 5157288 | Phase shifting circuits A phase shifting circuit includes: a pair of input terminals; a pair of output terminals; a variable gain amplifier and an active alternating current integrator, connected in series between the input terminals and the output terminals; and a control circu... | 10/20/1992 |
| 5043671 | Device for addition of the power from two alternating signals in a linear accelerator An improvement in a device for the combination of two alternating signals of the same frequency in which two microwave combination devices are associated with two phase shifters to combine the two signals. By coupling the two phase shifters according to a... | 08/27/1991 |
| 5013997 | Liquid cooled, high power, ferrite phase shifter for phased array antennas A compact, liquid cooled, ferrite phase shifter is capable of handling high power microwave signals without thermally stressing the ferrite core. The ferrite core is mounted on spacers inside of a hermetically sealed wave guide filled with a thermally con... | 05/07/1991 |
