Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7616462 | Power supply controller to actively drive a load current when the load current exceeds a set point A control circuit for a switching power supply reacts to an over current condition in the switching power supply to bring its operating point to a safe condition. The control circuit senses both the direction and the magnitude of the load current in the switching po... | 11/10/2009 |
| 7394234 | Power supply circuit and test apparatus A power-supply circuit for supplying voltage to a load while freely selecting positive voltage and negative voltage using a single power supply has a power supply that generates power-supply voltage, an inverted outputting circuit having a positive voltage terminal ... | 07/01/2008 |
| 7358696 | Method and apparatus for PWM drive During PWM control in which an actuator (9) is connected between the output terminals of a bridge circuit made up of switching elements (121, 122, 221, 222) and power is applied to the actuator (9) with signals G1U, G1L, G2U... | 04/15/2008 |
| 7353771 | Method and apparatus of providing power to ignite and sustain a plasma in a reactive gas generator According to a first aspect, a power supply and a method of providing power for igniting a plasma in a reactive gas generator is provided that includes (i) coupling a series resonant circuit that comprises a resonant inductor and a resonant capacitor between a switc... | 04/08/2008 |
| 7355361 | Motor control apparatus A motor control apparatus can protect circuit elements in an appropriate manner while preventing an incorrect abnormality determination when a motor is in regeneration operation, etc. The apparatus includes a target current calculation section (51), a drive c... | 04/08/2008 |
| 7348767 | Bidirectional power conversion with multiple control loops Bidirectional power conversion systems provide the ability to change power attributes to and from a component. Current bidirectional power conversion systems use a unidirectional power converter for each direction. The integration of the two normally independent pow... | 03/25/2008 |
| 7316052 | Closure profile and die plate for extruding same A reclosable pouch includes interlocking male and female closure elements having elongate hollow closure profiles. The male closure profile has a hollow shaft section, and the female closure profile has a channel with at least one hollow side. A set of pleated grip ... | 01/08/2008 |
| 7307858 | Power supply arrangement for battery powered device A battery powered headworn communication device and a method for conversion of a battery voltage in a battery powered headworn communication device, which includes providing a voltage reduction to a fixed part of the input voltage and providing a variable reduction ... | 12/11/2007 |
| 7305311 | Arc detection and handling in radio frequency power applications A radio frequency power delivery system comprises an RF power generator, arc detection circuitry, and control logic responsive to the arc detection circuitry. A dynamic boundary is computed about the measured value of a parameter representative of or related to the ... | 12/04/2007 |
| 7280375 | Circuit arrangement for operating at least one light-emitting diode A circuit arrangement is for operating at least one light-emitting diode LED in an electrical circuit at a service voltage greater than the forward voltage of the at least one light-emitting diode. The light-emitting diode is PWM-controlled. The circuit includes rea... | 10/09/2007 |
| 7271993 | Control of current in an inductance with pulse width modulation at control frequency A PWM controller for a bridge driver circuit for controlling current in an inductive load such as a motor, can set the driver into a forward mode, a slow decay mode or a fast decay mode, and can switch from slow decay mode into forward mode or into fast decay mode f... | 09/18/2007 |
| 7242197 | Current measuring apparatus, test apparatus, and coaxial cable and assembled cable for the apparatuses There is provided a current measuring apparatus for measuring current-under-measurement flowing between a first measuring terminal and a second measuring terminal, having a plurality of primary coils whose one end is electrically connected with the first measuring t... | 07/10/2007 |
| 7209374 | Capacitor-input positive and negative power supply circuit There is provided a power supply circuit having a simple configuration which is capable of eliminating an adverse effect due to pumping operation. The capacitor-input positive and negative power supply circuit is comprised of diodes, switching circuits connected in ... | 04/24/2007 |
| 7161819 | Zero-crossing correction in sinusoidally commutated motors An apparatus and method for controlling sinusoidal currents in inductive loads during zero-crossing to reduce distortion. The apparatus and method utilizes first and second PWM signals during a single PWM cycle to apply opposite voltage signals to obtain a net desir... | 01/09/2007 |
| 7112533 | Plasma etching system and method A system and a process for plasma etching a semiconductor device. The technique comprises periodically applying a heightened voltage bias during the plasma etching process so as to reduce accumulated charge on the surface of the semiconductor device during plasma et... | 09/26/2006 |
| 7102422 | Semiconductor booster circuit having cascaded MOS transistors The semiconductor booster circuit includes a plurality of stages, each of which has a MOS transistor and two capacitors. The MOS transistor, having a drain, a source and a gate, is formed in a well of a substrate portion. One capacitor has a terminal connected to th... | 09/05/2006 |
| 7058374 | Low noise switching voltage regulator A low-noise switching voltage regulator for supplying a voltage to a radio frequency (RF) power amplifier is disclosed. In one embodiment, the invention can be conceptualized as a power amplifier supply circuit, comprising a pair of oppositely polarized semiconducto... | 06/06/2006 |
| 7049772 | Motor drive circuit A motor drive circuit which have a first source-side transistor and a first sink-side transistor connected in series; a second source-side transistor and a second sink-side transistor connected in series; and a control circuit supplying the first source-side transis... | 05/23/2006 |
| 7042201 | Digital control circuit for switching power supply with pattern generator Digital control circuit for switching power supply with pattern generator. A method is disclosed for converting DC power from a first voltage level on an input to a different voltage level on an output for delivery to a load. Current from the input is switched to th... | 05/09/2006 |
| 7041203 | Apparatus and method for generating and using multi-direction DC and AC electrical currents Multi-directional currents are generated in a medium by cyclically reversing the direction of a conventional current applied to at least one of at least two electrodes so that an electromotive force (EMF) pulse travels from side of the electrode to the other, changi... | 05/09/2006 |
| 7038410 | Electric motor with dynamic damping A method of dynamically damping an electric motor (12) that is controlled by an H-bridge driver (16) by interdigitating power pulses with braking pulses by switching from a power switch mode to a shorting circuit mode with switches (22 and 26... | 05/02/2006 |
| 7019992 | Capacitively coupled power supply A power supply comprises a pair of first and second capacitors forming a capacitive voltage divider. A source of a periodic input supply voltage is coupled to the capacitive voltage divider for producing in the second capacitor, from a portion of the periodic input ... | 03/28/2006 |
| 7002307 | Single phase motor unit, method of driving single phase motor and integrated circuit A single phase motor driving unit comprises a first driving transistor supplying a single phase coil with a driving electric current in a certain direction, a second driving transistor supplying the single phase coil with a driving electric current in the opposite d... | 02/21/2006 |
| 6995531 | Direct current motor drive circuit and fan motor including the same A direct current motor drive circuit comprises: a hall element; an H-bridge drive circuit which receives an input of a sinusoidal signal outputted from the hall element and outputs rectangular wave signals corresponding to the sinusoidal signal; a dead time circuit ... | 02/07/2006 |
| 6977533 | 32V H-bridge driver with CMOS circuits A motor bridge driver interlace, implemented in an ASIC using cost-efficient CMOS technology, is designed to control four external MOS power transistors in a H-bridge configuration for DC-motor driving to achieve accurate and fast switching. Main components of the i... | 12/20/2005 |
| 6943317 | Apparatus and method for fast arc extinction with early shunting of arc current in plasma There is provided by this invention a novel apparatus and method of operating a dc plasma process that diverts the power supply current from the plasma at the initiation of an arc, thereby inhibiting energy from flowing from the power supply to the plasma, and then ... | 09/13/2005 |
| 6930408 | Circuit for the generation of electric power of opposite polarity in a pulsating power supply A circuit for generating electric power at the moment a D.C. pulsating power is suspended includes an induction device in series with or in parallel with the load for generating the power and supplying it to the load. ... | 08/16/2005 |
| 6847237 | 32V H-bridge driver with CMOS circuits A motor bridge driver interface, implemented in an ASIC using cost-efficient CMOS technology, is designed to control four external MOS power transistors in a H-bridge configuration for DC-motor driving to achieve accurate and fast switching. Main components of the -... | 01/25/2005 |
| 6735099 | Power supply unit for bipolar power supply The invention relates to a power supply unit for bipolar power supply of a plasma technology or surface technology system having at least one controllable d.c. power supply (G1, G2), whose positive and negative outputs are connected to the input of at ... | 05/11/2004 |
| 6720676 | In-vehicle electric power supply apparatus An arc preventing circuit 12 is disposed between a DC/DC converter 6 and a battery (of 36 volts or 12 volts). In the arc preventing circuit 12, when the DC/DC converter 6 and the battery are to be connected to each other, the connection i... | 04/13/2004 |
| 6418040 | Bi-directional architecture for a high-voltage cross-coupled charge pump An apparatus comprising a circuit configured to generate an output voltage having a magnitude greater than a supply voltage, where the output voltage is (i) a positive high voltage when a first input is in a first state and a second input is in a second s... | 07/09/2002 |
| 6400588 | Non-isolated A.C./D.C. converter A converter receiving an A.C. voltage between an input terminal and a reference terminal and providing two D.C. voltages of opposite polarities across a first and a second capacitor. The converter includes a first switch connected the input terminal and a... | 06/04/2002 |
| 6184741 | Bidirectional charge pump generating either a positive or negative voltage A charge pump comprises at least one charge pump stage including a first diode having an anode and a cathode, and a capacitor having a first plate connected to the cathode of the diode and a second plate connected to a clock signal that periodically varie... | 02/06/2001 |
| 6124751 | Boost capacitor for an H-bridge integrated circuit motor controller having matching characteristics with that of the low-side switching devices of the bridge An H-bridge circuit having a boost capacitor coupled to the gate of the low-side driver. A driver, in the form of a switching transistor is connected between the load and ground, thus providing a low-side driver. A capacitor is coupled to the gate of the ... | 09/26/2000 |
| 6119046 | Method of controlling a chopper driver and a circuit arrangement for executing the method Depending on the desired direction of current flux through an electrical load such as a stepped motor, in a measuring bridge circuit provided with switchable semiconductors and recovery diodes the semiconductors through which the current direction is swit... | 09/12/2000 |
| 6023418 | Low voltage polarity correcting DC to DC converter A DC to DC converter particularly suited for use to boost or reduce the voltage with single battery systems allows insertion of the battery in either polarity through use of a symmetrical arrangement of solid-state switches which alternate charging an ind... | 02/08/2000 |
| 6002600 | Reversible polarity high voltage power supply A high voltage power supply having a high voltage output terminal and capable of receiving an input for providing an alternating voltage signal to the power supply is provided. A voltage multiplier circuit is provided for operating on the alternating volt... | 12/14/1999 |
| 5999426 | Circuitry for voltage pole reversal A circuit arrangement for producing an output voltage with a first polarity with respect to a reference-earth potential from an operating voltage with a second polarity with respect to the reference potential. The circuit arrangement operates on the basic... | 12/07/1999 |
| 5990710 | High performance write driver for magnetic inductive recording head A circuit is provided to switch a drive transistor in a write driver circuit controlled by a write control signal to direct write current in a selected direction through an inductive head. Current is selectively conducted from a control region of the driv... | 11/23/1999 |
| 5939931 | Driving circuit having differential and H-bridge circuits for low voltage power source A driving circuit has first and second output terminals for connection with a load, for supplying the load with a constant voltage changing in polarity at predetermined timing, through the output terminals. A bridge circuit has first and second output nod... | 08/17/1999 |
