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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7852650 | Selectable line voltage inverters and associated methods An inverter capable of supplying power to utility grids of varying line voltages is described. In some examples, the inverter contains multiple output taps that are selected to output power to the utility grid based on the voltage of the utility grid. In some exampl... | 12/14/2010 |
| 7359222 | Method and apparatus to improve regulation of a power supply Techniques are disclosed to regulate a power supply with a compensation signal generation circuit. One example regulated power supply includes a sense circuit coupled to sense an output voltage of the regulated power supply. The regulated power supply also includes ... | 04/15/2008 |
| 7310038 | Electromechanical device for selecting coil voltage and locking the coil in place A system for selecting coil voltage in an electrical device comprises a housing and a coil in the housing having a plurality of windings. Each winding has a pair of pins. A slider supports a plurality of moveable contacts and is moveably mounted in the housing proxi... | 12/18/2007 |
| 7286036 | Method for selecting coil voltage and locking the coil in place A system for selecting coil voltage in an electrical device comprises a housing and a coil in the housing having a plurality of windings. Each winding has a pair of pins. A slider supports a plurality of moveable contacts and is moveably mounted in the housing proxi... | 10/23/2007 |
| 7283059 | Remote control multimedia content listing system A remote control multimedia content listing system for providing an updated content listing of various media within a remote control. The remote control multimedia content listing system includes a remote control having a housing, a display, a keypad, and an electro... | 10/16/2007 |
| 7271692 | Slider for selecting coil voltage and locking the coil in place A system for selecting coil voltage in an electrical device comprises a housing and a coil in the housing having a plurality of windings. Each winding has a pair of pins. A slider supports a plurality of moveable contacts and is moveably mounted in the housing proxi... | 09/18/2007 |
| 7259355 | Engine welder with full access A cabinet for an engine welder including an output power module driven by a DC input signal from a rectifier having an AC input signal created by an alternator rotated by an internal combustion engine. The cabinet has a front panel with a pivotally mounted door with... | 08/21/2007 |
| 7259971 | Encapsulated electronic power converter with embedded AC components A self-contained and encapsulated AC to Voltage supplying module containing a complete set of AC circuitry components therein and directly connecting the components to the AC voltage source, an inrush protection circuit, a DC-DC converter and power control circuits ... | 08/21/2007 |
| 7134027 | Initiating computer system power-up from a USB keyboard A keyboard connected to a computer by a USB cable has a power button for use when the computer is in a power-down state to initiate a system power-up operation. The data wires of the USB cable are connected to a first switch in the keyboard and a second switch in th... | 11/07/2006 |
| 7106605 | DC converter circuit with overshoot protection A DC-DC converter comprises an input circuit that stores inductive energy that includes a first switch that releases the stored inductive energy. A transformer includes a primary winding that communicates with the input circuit and a secondary winding. An output cir... | 09/12/2006 |
| 7023717 | Switching power supply apparatus The present invention relates to an isolated-type switching power supply apparatus, which includes a power supply, a transformer being connected to said power supply, a switching element for switching an electric current going through a primary coil of the transform... | 04/04/2006 |
| 6819076 | Active EMI filter with magnetoresistive sensor for common mode noise current A motor drive including an input for alternating current, a rectifier circuit, an inverter, an output which provides the controlled alternating current to drive a motor; and an active EMI filter for eliminating common mode noise in the motor drive which employs a ma... | 11/16/2004 |
| 6459604 | Power supply for both AC and DC A power supply for both alternating current (AC) and direct current (DC) which has an AC/DC converter and DC/DC converter detachably coupled with each other. The AC/DC converter is adapted to convert an AC input voltage into a DC signal, and the DC/DC con... | 10/01/2002 |
| 6392903 | Electronic equipment adapted to reduce power consumption during no operation The present invention provides electronic equipment that can shut off and supply power to a primary power supplying circuit by automatic operations, directly shut off power to the primary power supplying circuit by easy manual operations based on the oper... | 05/21/2002 |
| 6111772 | Universal, voltage variable, safety enhanced electric connector A universal, voltage variable, safety enhanced electric connector system is provided. Each connector in the system includes a housing, an electric plug and receptacle disposed at opposite side walls of the housing, and power supply circuit means disposed ... | 08/29/2000 |
| 5943228 | Method and arrangement for switching power of display monitor with remote controller A method for switching the power to a display monitor with a remote controller includes the steps of: (a) selecting a power-on/off switch of the display monitor by means of the remote controller; (b) checking whether the power to the display monitor befor... | 08/24/1999 |
| 5936857 | Power converter having multiple output voltage capability For use in a power converter having first and second output diodes coupled to a secondary winding of an isolation transformer and first and second output inductors, coupled to the first and second output diodes, respectively, and an output derived from th... | 08/10/1999 |
| 5812386 | Power supply control method and corresponding circuit A power supply control circuit generates DC power output intermittently at predetermined intervals during a power saving mode of operation, so as to save power. The power supply control circuit includes an AC power circuit for receiving AC power and for o... | 09/22/1998 |
| 5499184 | Power switch circuitry for electrically isolating the power switch from a power supply A power switch circuit including a small signal transformer and a low power oscillator for detecting the power switch while isolating it from the primary of the power supply. When the power switch is off, or is otherwise pressed to turn off the power supp... | 03/12/1996 |
| 5283728 | Variable transformer with slidable contactor A voltage control system has a pair of clockwise and counterclockwise interleaved coils on a portion of a transformer core, the coils having multiple spaced turns providing sets of co-planar alternate electrical contact pairs extending linearly to form a ... | 02/01/1994 |
| 4963795 | Step-controllable electronic ballast An inverter-type fluorescent lamp ballast is powered from the power line by way of a common and either of two (or more) different power leads. When powering the ballast by way of the common and the first one of these two power leads, the power provided to... | 10/16/1990 |
| 4887201 | Self-oscillating inverter with adjustable frequency A self-oscillating inverter uses saturable transformer means in its positive feedback circuit. The saturation flux density of the magnetic material used in this saturable transformer means determines the frequency of inverter oscillation. A permanent magn... | 12/12/1989 |
| 4644459 | Electronic inverter having magnitude-controllable output A push-pull inverter is supplied from an inductively current-limited DC voltage source by way of a center-tap on a transformer having significant inductance. This transformer inductance is parallel-coupled with a capacitance means. The inverter is made to... | 02/17/1987 |
| 4527229 | Flyback transformer with high voltage variable resistor built therein A high voltage variable resistor section (8) for deriving the focusing voltage and screen is attached to an open portion formed on one surface of a first case (47) which receives primary and secondary windings (2, 3) included in a flyback transformer sect... | 07/02/1985 |
| 4517472 | High voltage power supply A high voltage power supply is formed by three discrete circuits (12, 14, 16) energized by a battery (18) to provide a plurality of concurrent output signals floating at a high output voltage on the order of several tens of kilovolts. Each circuit has a r... | 05/14/1985 |
| 4398120 | Direct current supply particularly for cathode ray tube A direct current supply, making it possible to produce a number of separate regulated voltages from a single regulated supply, constituted by a voltage multiplier with cascade-connected doubler stages. One of the doubler stages, preferably the first, supp... | 08/09/1983 |
| 4170739 | Apparatus and method for supplying direct current with superimposed alternating current A power supply and a method for providing in a convenient and inexpensive way an unlimited range of direct currents with superimposed alternating sinusoidal or non-sinusoidal currents to a single load or to a number of loads in parallel. A novel power sup... | 10/09/1979 |
