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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 |
| 8183806 | Back EMF sensing interface circuit A back EMF signal from PWM driven motor is passed through an attenuation circuit. The attenuation circuit has a first mode of operation and a second mode of operation. The first mode of operation, used to sample a higher voltage back EMF signal during PWM on-time, a... | 05/22/2012 |
| 7742272 | Handling machine using lifting magnet It is realized to efficiently energize a lifting magnet device, and reduce the devices used in an energization system of the lifting magnet device in size, energy consumption, and noise as well. Other than a lifting magnet device 8, the handling machine inclu... | 06/22/2010 |
| 7701690 | System and method for suppressing load transients in radio frequency power amplifier switching power supplies A system and a method are disclosed for suppressing load transients in radio frequency power amplifier switching power supplies. A power supply control circuit is provided that includes a switcher circuit and a low drop out circuit. Load transients are suppressed by... | 04/20/2010 |
| 7433171 | Fast current control of inductive loads A circuit arrangement for the fast dissipation of the stored magnetic energy in an inductive load controlled by a first switch, comprising a high voltage-drop energy dissipation path disposed across the first switch and a second switch by which a constant-voltage di... | 10/07/2008 |
| 7405918 | Inductive load control A method is provide for controlling an inductive load device (ILD). The method includes providing a voltage potential across ILD and disabling a flow of current through the ILD resulting from the voltage potential across the ILD when a voltage across a sensing devic... | 07/29/2008 |
| 7349193 | Solenoid driver with high-voltage boost and reverse current capability Prior to the operation of a solenoid type of fuel injector, a DC voltage is applied across the injector to create a current through the injector that is below the activation current of the injector. A capacitor is then placed in series with the injector and the flyb... | 03/25/2008 |
| 7336470 | Solenoid drive apparatus and drive method A solenoid (30) has one end connected to the ground G and the other end connected to an N-MOS transistor (33) which applies current from a battery (31) to the solenoid (30). On the other hand, regenerative current generated when the N-MOS... | 02/26/2008 |
| 7336056 | Switching power converter that supports both a boost mode of operation and a buck mode of operation using a common duty-cycle timing signal The present invention is a switching power converter that supports both a boost mode of operation and a buck mode of operation, uses one energy storage element, transitions smoothly between boosting and bucking, and avoids simultaneous boosting and bucking. The swit... | 02/26/2008 |
| 7306196 | Electromagnetically driven valve The electromagnet includes a valve-opening side coil portion supplied with a current to thereby generate a first magnetic flux and generate electromagnetic force in a direction moving the valve-opening side moving element toward a valve-opening position, and a valve... | 12/11/2007 |
| 7265953 | Power supply boost control device and method for identifying and judging fault location in power supply boost control device A power supply boost control device and a fault location identification and judgment method for the power supply boost control device of this invention comprise a step of judging whether a power supply relay has a turn-on fault, a precharge circuit has a turn-on fau... | 09/04/2007 |
| 7245471 | Discharge device for inductive devices A method and apparatus for protecting an energized inductive device such as an electromagnet from an open circuit, i.e., the loss of the power source for the inductive device. A diode is connected across terminals of the inductive device such that when the inductive... | 07/17/2007 |
| 7164570 | Excitation control circuit for intermittently bypassing return current An excitation control circuit for suitably exciting a solenoid while current consumption and heating are effectively reduced. The control circuit has a driving circuit for driving a coil of a solenoid in response to a pulse signal supplied from an external device; a... | 01/16/2007 |
| 7158360 | Solenoid drive circuit A solenoid drive circuit includes a control circuit which comprises a detector with a resistor for discerning current flow therethrough to produce electric signals that correspond to level of current flow through a solenoid connected to the resistor; an amplifier fo... | 01/02/2007 |
| 7106022 | Velocity controlled disk drive head retraction with offset removal A control apparatus controls retraction of a device carried on a moveable member actuated by an electric motor. The control apparatus includes a measuring circuit with an output during a measuring phase including a back electromotive force (back EMF) from the electr... | 09/12/2006 |
| 7106938 | Self assembled three-dimensional photonic crystal A method of making a photonic crystal includes obtaining single spheres for use in making a self assembled opal structure. Spherical particles are placed centrifuge and separated from doublets using a relative difference in sedimentation velocity in response to cent... | 09/12/2006 |
| 7079345 | Demagnetization of magnetic media for data storage device using gradually reduced magnetic field Demagnetizing magnetic media for recording data in a data storage device includes placing the magnetic media in a magnetic field at a first strength, and gradually reducing the magnetic field to a second strength to essentially eliminate net magnetization in the mag... | 07/18/2006 |
| 7057870 | Inductive load driver circuit and system A circuit and system is disclosed for driving one or more inductive loads, or one or more electrical loads including one or more inductive components. A control computer is configured to selectively supply a boost voltage to the one or more inductive loads, and to c... | 06/06/2006 |
| 7012852 | Method, apparatus and system for detecting seismic waves in a borehole A method, apparatus and system for detecting seismic waves. A sensing apparatus is deployed within a bore hole and may include a source magnet for inducing a magnetic field within a casing of the borehole. An electrical coil is disposed within the magnetic field to ... | 03/14/2006 |
| 6971346 | System for controlling electromechanical valves in an engine A system for electronically actuating valves in an engine. The system includes a first voltage source, a second voltage source, and plural valve actuator subsystems coupled between the first voltage source and the second voltage source. Each valve actuator subsystem... | 12/06/2005 |
| 6948461 | Electromagnetic valve actuation A system and method for controlling an internal combustion engine provide valve actuation that selectively couples an energy storage device to a launching coil to recover energy stored in the magnetic field and valve spring of the launching coil, decouples the energ... | 09/27/2005 |
| 6918299 | Method and apparatus for improving performance of a force balance accelerometer based on a single-coil velocity geophone The invention concerns methods and apparatus for improving the performance of a force-balance accelerometer based upon a conventional, single-coil, velocity geophone. Specifically, the operating temperature range is increased through the use of both a temperature-co... | 07/19/2005 |
| 6771480 | Circuit to sample and compare the BEMF on an actuator into a constant velocity control A apparatus for controlling an actuator including, an integrator circuit to generate an integrated signal to be represented by a back EMF voltage, a amount circuit to generate a amount signal to indicate the amount to raise or lower the integrated voltage, a directi... | 08/03/2004 |
| 6735069 | Solenoid driver circuit A solenoid driver circuit includes an idling control portion for applying a very low voltage less than an activation threshold value to a solenoid from a switching circuit; a computing portion for computing the resistance value of the solenoid with the current value... | 05/11/2004 |
| 6657844 | Electromagnetic drive control device A drive control circuit for an electromagnetic driving device includes a magnet and a drive coil, which moves due to an electromagnetic force when an electrical current flows therethrough. The drive control circuit may include (1) a drive circuit that fee... | 12/02/2003 |
| 6657845 | Circuit for driving a solenoid A series circuit including a diode for refluxing and a capacitor is connected in parallel to a solenoid coil, and a light-emitting diode is connected in parallel to the capacitor. A negative voltage appearing across the solenoid coil because of an induced... | 12/02/2003 |
| 6507283 | Self-validating output module A self-validating output module in a control system includes a current detector and an operating component having at least two states. When the operating component is in the first state, current is directed away from a current detector and toward a load. ... | 01/14/2003 |
| 6493244 | System with massive choke in parallel with a/c line for load conditioning A massive choke coil [e.g. exceeding about three henries, with at least a thousand turns and a relatively low internal resistance of about eleven ohms] placed in parallel with the A/C line, that is, preferably across the A/C line's "hot" and "common" line... | 12/10/2002 |
| 6493203 | Phase control switch apparatus A phase control switch apparatus incorporating a phase-based break/make controller (80A, 80B, 80C) for protecting a reactive load such as a transformer (10) from transient surge phenomena taking place upon power-supply breaking/making operation. The phase... | 12/10/2002 |
| 6438250 | Method for making a conductor, or electric circuit balanced in radioelectric interference such as micro-discharge and corresponding conductor or circuit The invention relates to a manufacturing process of an electrical conductor or circuit compensated for radio interferences, including those from the electrical circuit itself. An application of a semi-conductor material (2) of resistivity coefficient allo... | 08/20/2002 |
| 6323564 | Circuit configuration with reduced EMI A circuit configuration with reduced EMC radiation in a motor vehicle includes a semiconductor switch with a load section which is connected, on one hand, through a first supply line to a positive battery terminal and, on the other hand, through a second ... | 11/27/2001 |
| 6198643 | System with choke in parallel with A/C power line for load conditioning A choke coil [e.g exceeding about three (3) henries] placed in parallel with the A/C line, that is, preferably across the A/C line's "hot" and "common" lines, quenching the reflected signal (or back emf) that is developed when any power amplifier or other... | 03/06/2001 |
| 6175484 | Energy recovery circuit configuration for solenoid injector driver circuits A circuit configuration wherein a plurality of solenoid driver circuits are all coupled together such that the high voltage supply associated with one driver circuit is connected in parallel with the high voltage supply of another driver circuit. Each dri... | 01/16/2001 |
| 6157095 | Control circuit for inductive loads A control circuit for controlling the current through an inductive load powered by a unipolar power source. The current through the inductive load is controlled by three electronic switches and a subcircuit. The switches provide three different voltage le... | 12/05/2000 |
| 6140717 | Method and device for switching an inductor A method and device for switching an inductor are described. A first terminal of the inductor may be connected to ground via a first switching device. A second terminal of the inductor is always connected to a voltage power supply. A second inductor may b... | 10/31/2000 |
| 6031708 | Inductive charge control device Apparatus for controlling an inductive load, particularly for a coil of an electromagnet, including an electronic chopper switch fitted in series with the coil and controlled by a pulse width modulator, and an opening switch, also fitted in series with th... | 02/29/2000 |
| 5986355 | Arrangement and method for reduction of magnetic fields and use thereof The present invention relates to an arrangement for reduction of magnetic alternating fields for example in a vehicle or similar which comprises at least one electrical system which comprises at least two elements of which at least one comprises one or mo... | 11/16/1999 |
| 5982604 | Power supply apparatus for electronic control unit in automotive vehicle A power supply apparatus is provided for energizing an electronic control unit mounted on a vehicle having a battery and a starter switch. The apparatus includes a coil connected to the power supply line, and a switch which operates for selectively enabli... | 11/09/1999 |
| 5953198 | Electromagnetic drive apparatus An electromagnet drive apparatus being characterized by a switching element 1 connected in series with a coil 3 of an electromagnet; a pulse signal generation circuit 16 which generates, on predetermined cycles, a pulse signal used for turning on the swit... | 09/14/1999 |
| 5952738 | Switching circuit for an inductive load In a circuit, switch (1) switches a current from a reference voltage terminal through an inductive element (3). The energy stored in the magnetic field associated with the inductive element when a current is flowing is transferred on interruption of the c... | 09/14/1999 |
| 5933312 | Free-wheel circuit with an adjustable off delay time The magnetic residual energy stored in a coil is made to decay within a shorter and/or definite time period by the use of a free-wheeling circuit connected in parallel. The free-wheeling circuit comprises a series circuit, which includes a first diode and... | 08/03/1999 |
