Celebrity Inventors
Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8102684 | Relief circuit A circuit arrangement for limiting excessive voltages by a forward delay time of a first diode is described. The first diode is alternately switched in a non-conducting direction and a conducting direction by switching a circuit element. The first diode is series-co... | 01/24/2012 |
| 7817450 | Method and apparatus for resetting a silicon controlled rectifier bridge A method and an apparatus for resetting at least one Silicon Controlled Rectifier (SCR) in an H-bridge. The apparatus comprises a current interruption device for controlling current flow through the H-bridge, and a negative voltage detector for detecting a negative ... | 10/19/2010 |
| 7412766 | Method of fabricating coil-embedded inductor A method of fabricating a coil-embedded inductor provides steps for obtaining uniform density of coil-embedded inductor. The cavity of a first die is filled with dust before being flipped, and then filled with dust a second time. The dust in the cavity is pressed on... | 08/19/2008 |
| 7375986 | Method and device for producing an electric heating current, particularly for inductive heating of a workpiece A heating current used to inductively heat a metallic or magnetic work-piece is generated by an inverter supplied by a supply voltage. The inverter includes four switching elements arranged in an H-bridge circuit having two parallel longitudinal branches and a trans... | 05/20/2008 |
| 7368891 | Charge control method of capacitor in thyristor converter Charging time of a capacitor is shortened while avoiding erroneous firing due to distortion of a power supply voltage and sustaining an inrush current at a constant level. In the charge control method of a capacitor in a thyristor converter comprising a thyristor fo... | 05/06/2008 |
| 7352233 | Efficient thyristor-type power switches The highest-power switches now available are based on thyristor-type devices: GTOs (Gate turn-off thyristors), MTOs (MOS controlled turn-off thyristors), IGCTs (Integrated gate commutated thyristors), and the new ETOs (Emitter turn-off thyristors). These devices han... | 04/01/2008 |
| 7324314 | Disconnect switch with early break feature A disconnect switch that provides a simple and economical means for preventing the possibility of stray/surge current from damaging the solid state components of an inverter drive is provided. The disconnect switch includes early break auxiliary contact(s) that open... | 01/29/2008 |
| 7304436 | Generator for sustaining pulse of plasma display panel It is disclosed that there is a sustaining pulse generator of a plasma display panel capable of simplifying a circuit configuration thereof. A sustaining pulse generator of a plasma display panel according to an embodiment of the present invention includes a ... | 12/04/2007 |
| 7302676 | Method for debugging flowchart programs for industrial controllers A method for debugging flowchart based computer programs for industrial controllers, in particular motion controllers, wherein suspend commands are assigned to the graphical elements. Through the use of a task control mechanism in the run time system, the user may d... | 11/27/2007 |
| 7268516 | Circuit for use with switched reluctance machines A switched reluctance machine is energized by phase circuits with four active switches, for example MOSFETs, arranged in a bridge configuration. The switches are capable of conducting current in both a first direction and a second direction and are capable of operat... | 09/11/2007 |
| 7253639 | Insulation resistance deterioration detection method and insulation resistance deterioration detection device for motor, and motor driver The drive of the motor is stopped, the electromagnetic switch contacts are switched OFF, and thereafter the first and second contact points are closed to form a closed circuit of the smoothing capacitor, second contact point, first and second resistors, motor coil, ... | 08/07/2007 |
| 7221121 | Frequency converter for different mains voltages The invention is directed to controlling an electric motor by means of a frequency converter. The frequency converter can be connected to one of several different mains voltages. According to the present invention, the maximum output power of the frequency converter... | 05/22/2007 |
| 7221106 | Cordset based appliance controller An apparatus and method for distributed control of an electrical appliance having a plug and a load and two power carrying conductors connecting the plug to the load, comprising locating power control elements completely within the plug, connecting interface element... | 05/22/2007 |
| 7203041 | Primary side turn-off of self-driven synchronous rectifiers There is disclosed a power conversion circuit including self synchronous rectifiers and a rapid shutdown section. When power is removed from the power conversion circuit, the rapid shutdown section prevents self oscillation of the self synchronous rectifiers. As a r... | 04/10/2007 |
| 7200018 | Charging of a filter capacitor in the intermediate circuit of a frequency converter A method and an apparatus for charging a filtering capacitor in the direct-voltage intermediate circuit of a voltage-controlled PWM frequency converter comprising a rectifier (20) connected to an alternating-current source (UR, US, U | 04/03/2007 |
| 7187155 | Leakage inductance saturation compensation for a slip control technique of a motor drive An electronic drive for vector control of an induction motor controls slip and operating frequency in response to changes in stator voltage. The drive includes a torque control loop, a flux control loop and a frequency control loop. The control is based on a command... | 03/06/2007 |
| 7145268 | Fault-tolerant three-level inverter A method for driving a neutral point clamped three-level inverter is provided. In one exemplary embodiment, DC current is received at a neutral point-clamped three-level inverter. The inverter has a plurality of nodes including first, second and third output nodes. ... | 12/05/2006 |
| 7132185 | Fuel cell system shunt regulator method and apparatus A fuel cell system for powering a work load includes a fuel cell stack and a shunt regulator having a threshold detection; transistorized power switching element, and a dump load. The threshold detection element identifies when an abnormally high voltage rises. The ... | 11/07/2006 |
| 7126304 | Motor controller and electric power steering apparatus A microcomputer includes a rotation angular velocity computation section, a feedback gain determination section, and a dead time compensation amount determination section. The rotation angular velocity determination section computes the rotation angular velocity of ... | 10/24/2006 |
| 7091625 | Home-use fuel cell system During a time zone where a power demand is smaller than an average value of the entire power demands of homes, an excess portion obtained by subtracting a power demand from a base power portion supplied by PEFC (1) is charged in a capacitor (7) and a l... | 08/15/2006 |
| 7087870 | Induction heating or melting with multiple frequencies An apparatus and process are provided for multi-frequency induction heating of a workpiece. Switching devices are used to selectively add, remove or reconfigure capacitive elements in the circuit to change the circuit's resonant frequency, and consequently, the freq... | 08/08/2006 |
| 7073393 | Magnetic flowmeter with built-in simulator A magnetic flowmeter transmitter includes a differential amplifier that senses an additive combination of actual flowmeter electrode outputs and simulated electrode outputs. The differential amplifier provides an additive amplifier output. A simulator provides the s... | 07/11/2006 |
| 7064516 | Motor driver While the motor drive amplifier is not operating, electromagnetic switch contacts are held closed for a predetermined period of time, three-phase power is rectified by a rectifier circuit and a smoothing capacitor is charged. Then, the smoothing capacitor is dischar... | 06/20/2006 |
| 7050313 | Aircraft AC-DC converter An AC-DC converter includes a DC reference voltage generation unit that creates a DC reference voltage waveform based in part on a feedback signal. The AC-DC converter also includes an SCR firing unit that receives a variable frequency power output from the generato... | 05/23/2006 |
| 7026783 | Drive system A drive system includes a central power supply with a line-commutated converter and a DC/DC converter connected downstream of the line-commutated converter, and a plurality of inverters, each inverter having an output connected a load, for example a motor, and a DC ... | 04/11/2006 |
| 7005813 | Booster circuit for a pre-drive circuit of a brushless direct current single-phase motor A booster circuit for a pre-drive circuit of a brushless direct current single-phase motor. When a series pair of power FETs of the drive circuit turn on, one boost control switching element of the pre-drive circuit turns on, another series pair of power FETs of the... | 02/28/2006 |
| 6922883 | Method for making a non-linear inductor Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inducto... | 08/02/2005 |
| 6919712 | Excitation control device and excitation control method A reference voltage of an output terminal of a synchronous machine is set according to a reactive current output from the synchronous machine, a reference voltage of the high voltage side of a transformer, and a phase compensation transfer function to quicken attenu... | 07/19/2005 |
| 6911789 | Power supply for a hot-filament cathode In accordance with one embodiment of the present invention, there is provided a switch-mode power supply to generate the heating current for a hot-filament electron-emitting cathode. The power supply directly couples, without an output transformer, the output from a... | 06/28/2005 |
| 6909619 | Spike control apparatus for DC-DC converter There are disclosed a synchronous rectifying type of DC—DC converter, a DC—DC converter control circuit constituting such a type of DC—DC converter, a monitor circuit for monitoring an operation of a DC—DC converter, and an electronic equipment having a DCâ€... | 06/21/2005 |
| 6903946 | Paralleled power factor correcting AC-to-DC converters with improved current balance A power supply for a capacitive-resistive load includes plural paralleled phase correcting modules together with current sharing controllers for tending to equalize their currents. Each module is provided with a diode, poled to prevent forward current from flowing i... | 06/07/2005 |
| 6822883 | Converter circuit arrangement, as well as a method for matching a variable DC voltage A converter circuit arrangement is disclosed for matching a variable DC voltage to a drive circuit for producing drive signals and having a three-point DC voltage intermediate circuit (2), which three-point DC voltage intermediate circuit (2) is formed... | 11/23/2004 |
| 6819576 | Power conversion apparatus and methods using balancer circuits A power conversion apparatus, such as an uninterruptible power supply (UPS), includes an input port, an output port, and first and second busses. An output circuit, for example, a half-leg inverter, is coupled to the first and second busses and to the output port an... | 11/16/2004 |
| 6774758 | Low harmonic rectifier circuit Non-linear inductor(s) are used to reduce the percent total harmonic distortion of the harmonics in the line currents in the input side rectifier system of an ac drive system. Several constructions for the non-linear inductor(s) are described. The non-linear inducto... | 08/10/2004 |
| 6664750 | D.C. motor bridge coil driver An H-type motor bridge coil driver circuit is implemented with an electronic switch in each leg segment of an H-shaped circuit, this bridge circuit having its side legs each connected between a power supply and ground, with the inductive load of a motor c... | 12/16/2003 |
| 6621678 | Thermal protection circuit and method for protecting power delivery circuit A thermal protection circuit arranged in an integrated circuit for protecting a power delivery is disclosed. The thermal protection circuit for protecting a power delivery circuit includes a first thermal sensing circuit exhibiting a negative temperature ... | 09/16/2003 |
| 6597590 | 3-Level inverter apparatus Switching devices conjointly use snubber circuits without disposing for each switching device and is interposed between a DC neutral point N and a positive terminal plate of a DC power source. A second snubber circuit is interposed between the DC neutral ... | 07/22/2003 |
| 6563723 | Fault tolerant power supply circuit A fault current tolerant power supply circuit having a dc power source and switching devices for inverting dc current from the source into ac load current includes a protective circuit for protecting the switching devices from overvoltage conditions when ... | 05/13/2003 |
| 6556459 | Uninterruptible power supply and method of turning off AC switch for uninterruptible power supply An uninterruptible power supply is provided that is capable of turning off an AC switch made up of thyristors as quickly as possible by using a power converter. A power is supplied from the utility power supply 3 to the load 9 through the AC switch 1 made... | 04/29/2003 |
| 6483730 | Power converters with AC and DC operating modes and methods of operation thereof A power converter suitable for use in an uninterruptible power supply (UPS) includes first and second voltage busses, an input port having a first terminal coupled to one of the first and second voltage busses, a neutral bus and an output terminal. A firs... | 11/19/2002 |
