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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 7362077 | Pre-charge method for isolated boost converter A boost control module operates semiconductor switches of a boost converter circuit in an avalanche mode to precharge a boost output capacitor. The boost control module comprises a switching module that complementarily transitions a first semiconductor switch and a ... | 04/22/2008 |
| 7333349 | Single-stage buck-boost inverter An improved Single-Stage Buck-Boost inverter (S2B2 Inverter) is provided, using only three or four power semiconductor switches and two coupled inductors in a flyback arrangement. The inverter can handle a wide range of dc input voltages and pr... | 02/19/2008 |
| 7265650 | Power factor correction rectifier having independent inductive components A PFC circuit comprises a first converter and a second converter and a multi-port electromagnetic device. The first converter has a first inductive element and the second converter has a second inductive element. The multi-port electromagnetic device comprises a fir... | 09/04/2007 |
| 7107468 | Peak current sharing in a multi-phase buck converter power system A plurality of constant ON-time buck converters are coupled to a common load. The output of each buck converter is coupled to a common load via a series sense resistor. The regulated output voltage across the common load is compared to a reference voltage to generat... | 09/12/2006 |
| 7098726 | Method and apparatus for operating a voltage regulator based on operation of a timer In accordance with an embodiment of the disclosed matter, a voltage regulator may supply power to a component within a computer system. A timer may be provided. The voltage regulator may operate synchronously, and when the timer expires the voltage regulator may ope... | 08/29/2006 |
| 7002304 | Multi-lamp drive device A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound aroun... | 02/21/2006 |
| 6978745 | System for controlling electromechanical valves in an engine A system for electronically actuating valves in an engine. The system includes first and second voltage sources, and a plurality of valve actuator subsystems coupled therebetween. Each valve actuator subsystem has a valve actuator and a switch configured to selectiv... | 12/27/2005 |
| 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 |
| 6924634 | Power supply with feed forward circuit In those conventional arts, a power supply with a voltage holdup circuit generates a peak voltage in output voltage when a switching operation is occurred, and so the quality of the output voltage is decreased and a risk of operating fault in a load apparatus. The p... | 08/02/2005 |
| 6653824 | Continuous feed-forward AC voltage regulator The present invention is an AC voltage regulator which includes a feed-forward circuit and a differential amplifier which continuously and instantaneously compares the incoming AC voltage to a locally generated, amplitude-stabilized wave form. The local w... | 11/25/2003 |
| 6580253 | Boosting and step-down switching regulator controlling circuit and boosting and step-down switching regulator for use in the same A boosting and step-down switching regulator includes one error amplifying circuit, and an output of the error amplifying circuit is compared with a triangular wave for boosting and a triangular wave for step-down different in voltage level from each othe... | 06/17/2003 |
| 6288510 | Drive controller for motor-driven high-speed rotating body and method for discriminating type of machine used therefor An objective of this invention is to provide a drive control device to control the drive applied to a high-speed rotor unit which would have no circuits in either its pump unit A or its power supply unit B that would limit the use of the device with vario... | 09/11/2001 |
| 6163139 | Boost converter with reduced switching loss A low power loss boost converter of the discontinuous conduction type includes an inductor coupled between the boost converter input and a junction, a current rectifier coupled between the junction and the converter output, a switch coupled between the ju... | 12/19/2000 |
| 6020726 | AC voltage regulator An AC voltage regulator provides a desired AC voltage to a load. The desired AC voltage is within a predetermined range above and below that of an AC voltage source. The AC voltage regulator has a transformer, the secondary winding of which is configured ... | 02/01/2000 |
| 5867377 | System and method for improving the efficiency of reserve battery-powered, partitioned power conversion systems under light load conditions In a partitioned power converter system having a central uninterruptible power supply ("UPS") stage couplable between a commercial power source and a peripheral stage, the central UPS stage including a primary converter that converts commercial power from... | 02/02/1999 |
| 5610451 | Uninterruptible power supply with power factor correction An energy efficient uninterruptible regulated power supply includes a full wave rectifier that is responsive to AC main power generating an unregulated DC voltage signal, a power factor correcting boost converter coupled to receive and selectively increas... | 03/11/1997 |
| 5477131 | Zero-voltage-transition switching power converters using magnetic feedback A soft-switching circuit for achieving zero-voltage-transition (ZVT) type commutation in switching power converters includes a magnetic feedback circuit for achieving substantially zero voltage turn on of the active power switches and for achieving zero v... | 12/19/1995 |
| 5402060 | Controller for two-switch buck-boost converter A controller for a two-switch buck-boost converter accomplishes one-at-a-time switch control by simultaneously employing an analog error signal to control one drive output and an analog inversion of that error signal, with respect to a voltage that is equ... | 03/28/1995 |
| 5355295 | Series-parallel active power line conditioner utilizing temporary link energy boosting for enhanced peak voltage regulation capability A series-parallel active power line conditioner is provide having improved peak voltage regulation capability when compared with the prior art. The DC energy level in the DC link between the series and parallel inverters is temporarily increased when the ... | 10/11/1994 |
| 5087872 | Circulating load apparatus A circulating load apparatus for loading a power supply. The power supply has a power input terminal, a power output terminal and a power return terminal. The power supply provides an output voltage at the power output terminal with respect to the power r... | 02/11/1992 |
| 4933624 | Electric power supply with controllable voltage boost To increase the output voltage of a conventional rectifier bridge, one winding of an autotransformer is connected across a pair of a-c input terminals of the bridge through a thyristor which is turned on only when an output voltage increase is desired, an... | 06/12/1990 |
| 4916329 | Uninterruptible power supply An uninterruptible power supply device uses a transformer with a first primary winding and secondary winding tightly coupled to one another to transmit AC input electrical power to a voltage sensitive load. A series regulator switches taps in the first pr... | 04/10/1990 |
| 4791348 | Switching ac voltage regulator A pulse-width ac voltage regulator that provides a precisely ac output voltage without the need for any inefficient protective circuitry for ensuring proper operation when it repeatedly switches between its two alternative operating modes. A transformer i... | 12/13/1988 |
| 4774451 | Voltage controlling transformer circuit and method for generating a controlled load voltage by using such a transformer circuit A voltage controlling transformer circuit comprises a setting unit to the input terminals of which an alternating input voltage is applied and the output terminals of which provide an alternating output voltage the amplitude of which can selectively be ch... | 09/27/1988 |
| 4745352 | Switching AC voltage regulator A switching AC voltage regulator including a transformer, two solid state AC switches, and sensing means controlling the switches to produce the desired output voltage. The two switches conduct alternately and are switched at a rate much higher than the f... | 05/17/1988 |
| 4692686 | Low-distortion line voltage regulator An AC voltage regulator maintains a predetermined, desired output voltage despite changes in the input voltage, the load, or other operating conditions. The regulator generates an AC reference voltage signal of the same frequency and in phase with the inp... | 09/08/1987 |
| 4684827 | Circuit arrangement for detecting a current in power supply devices A circuit arrangement for detecting a current flowing over a path in a power supply device, which arrangement includes a choke having a primary winding and a measuring winding, with each winding having first and second ends and the choke being connected s... | 08/04/1987 |
| 4622513 | Gating of the thyristors in an arcless tap changing regulator A voltage regulator using electronic control of two static switch circuits to permit tap changing without arcing at the switched electrical contacts, without interrupting the load current, and without inducing sizable circulating currents. As a mechanical... | 11/11/1986 |
| 4536696 | Buck-boost converter with dual-mode control for battery charging A voltage controlled flyback converter used as a battery charging circuit avoids the power dissipation of the more conventional series-type regulator-type charging circuits but cannot be readily utilized because of the high gain in the feedback loop due t... | 08/20/1985 |
| 4476521 | Perin rectifier apparatus Improvement in a regulated D.C. power supply having a conventional main transformer with a center tap secondary and rectifying elements, the improvement comprising a buck-boost transformer, and a regulating device, the buck-boost transformer being of the ... | 10/09/1984 |
| 4429269 | Feed forward AC voltage regulator employing step-up, step-down transformer and analog and digital control circuitry A feed forward AC voltage regulator utilizes a step-up, step-down transformer to apply adjustment voltages to an unregulated AC line. Analog circuitry periodically samples the unregulated AC line input and compares it with a scaled representation of the d... | 01/31/1984 |
| 4330818 | Variable voltage direct current power supply and motor speed control A continuously variable voltage direct current power supply having first and second output terminals is provided using a variable transformer with a core of magnetically permeable material encircled by at least one electrical winding, with segments of win... | 05/18/1982 |
| 4156174 | Phase-angle regulator Phase angle regulator for high voltage power distribution systems. An electrical transformer having inductively coupled series and regulating windings is provided with the series windings connected between a source of electrical power and an electrical lo... | 05/22/1979 |
| 4055740 | Induction heating apparatus using a saturable reactor for power control purposes An induction heating apparatus includes a saturable reactor having a pair of rectangular ferrite cores. An air gap is provided in each ferrite core to provide a gradually increasing saturation characteristic on the magnetization curve of the cores. A pair... | 10/25/1977 |
| 4048467 | Apparatus for generating and regulating welding currents Apparatus for generating and regulating welding currents, having primary and secondary circuits connected through a transformer, an anti-parallel connection of two thyristors in the primary circuit, a choke in parallel with this anti-parallel connection a... | 09/13/1977 |
| 4041431 | Input line voltage compensating transformer power regulator A transformer power regulator and method of utilizing same for efficiently and variably delivering A.C. power to a load by regulating only a portion of the input voltage equal to maximum expected voltage variation in the input voltage source while transmi... | 08/09/1977 |
