Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8154152 | Method of controlling DC/DC converter, fuel cell vehicle for carrying out such method A triangular-wave current flows through a reactor of a DC/DC converter for converting voltages between increased and reduced levels. Surges are reduced, which are developed in an output voltage serving as a control voltage when the triangular-wave current changes ac... | 04/10/2012 |
| 8067855 | Power supply circuits This invention is generally concerned with power supply circuits, and more particularly, with circuits to supply power to a mains supply, such as domestic grid mains, from a photovoltaic device. A photovoltaic power conditioning circuit for providing power from a ph... | 11/29/2011 |
| 7986057 | Method and system for improving peak power capability of an aircraft A method and system for improving peak power capability in an electrical system is disclosed. The system may include an auxiliary generator operated in conjunction with one or more main engine generators during the need for increased transient load demands. The syst... | 07/26/2011 |
| 7964990 | Power supply apparatus An uninterrupted power supply unit is provided with a straightforward switch connected between a power source and a load to supply or interrupt a power to a system. The combination of the outputs from two kinds of single phase inverters enables compensating for a va... | 06/21/2011 |
| 7932633 | Apparatus for transferring energy using power electronics and machine inductance and method of manufacturing same A traction inverter circuit includes a first energy storage device configured to output a DC voltage, a first bi-directional DC-to-AC voltage inverter coupled to the first energy storage device, and a first electromechanical device. The first electromechanical devic... | 04/26/2011 |
| 7928603 | Power supply system, vehicle using the same and its control method An integral element corresponding to a converter continues an integral operation even in a period in which a voltage converting operation of the converter is suspended. The integral output integrated in this period is invalid data. Therefore, if the invalid integral... | 04/19/2011 |
| 7911082 | Solar cell device The invention provides a solar cell device having a plurality of solar cell modules Z1, Z2, Z3, . . . , Zn, whose voltage outputs (UE1, UE2, UE3, . . . , UEn) are each coupled via a switching element (... | 03/22/2011 |
| 7880330 | Controlling a power converter A load is powered by a power source and a capacitive element in series such that the voltage provided to the load is the sum of the voltages of the power source and the capacitive element. A power converter imposing a limit on a flow of current through at least a po... | 02/01/2011 |
| 7847432 | Power supply system and vehicle Transfer functions of control have duty commands as inputs and battery current values as outputs, provided corresponding to respected converters. Control gains are determined such that certain transfer functions substantially match with each other, with respect to d... | 12/07/2010 |
| 7804193 | Energy recycle system for use with AC current power supply An energy recycle system for use with an AC current power supply, for example, an electronic ballast, is presented. The energy recycle system includes an energy recycle load connected to an output terminal of the AC current power supply, in which the energy recycle ... | 09/28/2010 |
| 7795753 | Fuel cell control system To control the receiving power, this invention uses a secondary battery to cut peaks of the receiving power. Further, this invention calculates the load power from the detected receiving power value and command values of the secondary battery in the controller and t... | 09/14/2010 |
| 7750501 | System and method of over voltage control for a power system A system and method for preventing over voltages in a power system coupled to an electric machine are disclosed. Briefly described, one embodiment is a method comprising detecting an operating voltage on a high voltage direct current (HVDC) bus, determining if at le... | 07/06/2010 |
| 7723865 | Bidirectional buck boost DC-DC converter, railway coach drive control system, and railway feeder system According to the present invention, a bidirectional buck boost DC-DC converter can be obtained, in which power can flow bidirectionally from a primary side to a secondary side and from the secondary side to the primary side, regardless of a magnitude relation betwee... | 05/25/2010 |
| 7692330 | Electronic equipment, and battery pack and load apparatus used in the same Electronic equipment is provided in which a bi-directional voltage converter is connected between a fuel cell and a secondary battery, and a load apparatus is connected in parallel to the fuel cell. Further, if a plurality of voltage converters are provided, when ea... | 04/06/2010 |
| 7592715 | Multiple sources of operating power to a load A system comprises a first power supply, a second power supply, and a load coupled to the first and second power supplies via separate power connectors. The load receives separate operating power from each of the first and second power supplies. ... | 09/22/2009 |
| 7576449 | Method for converting direct voltage into three-phase alternating voltage A method of converting a direct voltage generated by a decentralized power supply system into three-phase alternating voltage by means of a plurality of single-phase inverters (WR1-WR3), said alternating voltage being provided for supplying an electric... | 08/18/2009 |
| 7498691 | Frequency converter for an immersion vibrator The invention relates to a frequency converter for an immersion vibrator, comprising a mobile converter housing, and a converter circuit disposed in said converter housing and adapted to convert an electrical supply voltage to a special voltage. The converter is fur... | 03/03/2009 |
| 7482709 | System for powering and controlling electrical equipment of an aircraft engine or its environment A system for powering and controlling electrical equipment of an aircraft engine or of its environment, includes at least one DC voltage power supply bus, a set of power supply modules associated with an electrical equipment group, each module including a voltage co... | 01/27/2009 |
| 7474016 | System and method for responding to abrupt load changes on a power system A system and method for responding to abrupt load changes on a power system transfers an initial amount of power from an external power source to the AC power system through a secondary converter module; senses an abrupt load change occurring-on the AC power system;... | 01/06/2009 |
| 7405494 | AC power supply apparatus, methods and computer program products using PWM synchronization Paralleled uninterruptible power supplies (UPSs) including respective pulse-width modulation (PWM) power converter circuits coupled in common to an AC load bus have PWM cycles that are synchronized. In particular, sampling of control inputs of the PWM power converte... | 07/29/2008 |
| 7394168 | Power system for a telecommunication facility Disclosed is a method of supplying DC power to equipment using proton exchange membranes (PEMs). PEMs run on hydrogen to produce DC electrical power. In the disclosed embodiment these PEMs are used as an alternative source of power to AC sources. One of these other ... | 07/01/2008 |
| 7373528 | Increased power for power over Ethernet applications According to one embodiment of the invention, a method for supplying power over Ethernet includes determining whether a first port of power sourcing equipment is supplying current to a power over Ethernet device in a predetermined current range. The method also incl... | 05/13/2008 |
| 7368833 | Multichannel DC/DC converter An apparatus which has a first stage with an input circuit with an inductive element (1), a second stage with a number of output circuits with loads (3, 4, 5) and a switching means (S1, S2, S3) for controlling the currents from the... | 05/06/2008 |
| 7362601 | Power supply device A power supply device includes two input ports, two output ports, a transformer having primary and secondary windings, a switch device, and a controller. The switch device includes a switching element connected in series with the primary winding, and a capacitor. Th... | 04/22/2008 |
| 7348688 | Low power, scalable multichannel high voltage controller A low voltage control circuit is provided for individually controlling high voltage power provided over bus lines to a multitude of interconnected loads. An example of a load is a drive for capillary channels in a microfluidic system. Control is distributed from a c... | 03/25/2008 |
| 7346462 | System, method, and article of manufacture for determining parameter values associated with an electrical grid A system, method, and article of manufacture for determining parameter values associated with an electrical grid in accordance with an exemplary embodiment is provided. The electrical grid has a point of interconnection where the electrical grid is electrically coup... | 03/18/2008 |
| 7345379 | Power converter with voltage and current fault setting A power converter includes a steady-state controller for outputting a first voltage command such that a detected power value matches a power command, a transient controller for outputting a second voltage command such that a voltage detected before the occurrence of... | 03/18/2008 |
| 7336004 | Topologies for using multiple energy sources for power conversions A boost converter and a buck-boost converter supply power to a load from a series connection between a first and a second power source. ... | 02/26/2008 |
| 7325498 | Hybrid energy off highway vehicle propulsion circuit A system and method for retrofitting a propulsion circuit of an existing Off Highway Vehicle to enable the propulsion circuit to operate as a hybrid energy Off Highway Vehicle propulsion circuit. The hybrid propulsion circuit includes a primary power source, and a t... | 02/05/2008 |
| 7317301 | Auxiliary power supply An auxiliary power supply equipment for a high voltage installation includes a power source at ground potential, a load circuit at high potential, and a transmission link for coupling the power source to the load circuit. The power source includes a high frequency v... | 01/08/2008 |
| 7301313 | Multiple voltage regulators for use with a single load Multiple voltage regulators for use with a single load. The present invention allows power to be supplied to an electrical load using multiple voltage regulators based on the operating environment of the load. In one embodiment, a primary voltage regulator that is b... | 11/27/2007 |
| 7271503 | Power supply circuit including stably operating voltage regulators A power supply circuit is constructed by a step-up circuit for receiving an input DC voltage to generate a plurality of output DC voltages, and a plurality of voltage regulators, each powered by two voltages selected from a combination of the output DC voltages and ... | 09/18/2007 |
| 7262978 | Voltage conversion apparatus, voltage conversion method, and computer-readable recording medium with program recorded thereon to allow computer to execute voltage conversion control A control device receives an output voltage of a voltage-up converter from a voltage sensor, and calculates a feedback preliminary voltage control value determined by the difference between a voltage control value and the output voltage. The control device corrects ... | 08/28/2007 |
| 7259481 | Automatic transfer switch capable of receiving input power having voltage within a wide range An automatic transfer switch (ATS) system and method of operating an ATS system are disclosed. The ATS system includes at least one input port capable of being coupled to at least one power source to receive an input power, a first internal component that requires i... | 08/21/2007 |
| 7259474 | Method and apparatus for aggregating power from multiple sources A method and apparatus for aggregating power from multiple sources generates a single direct current regulated voltage. The apparatus comprises a plurality of slave voltage converters and a master pulse width modulator circuit. Providing a plurality of direct curren... | 08/21/2007 |
| RE39710 | System for providing assured power to a critical load A power system (8) is provided for economically supplying uninterrupted electrical power to one or more critical loads (14). One or more fuel cell power plants (18) provide one substantially continuous source of power, and a utility grid (10 | 07/03/2007 |
| 7227278 | Multiple bi-directional input/output power control system A multiple bi-directional input/output power control system includes a network of functional blocks housed in a single enclosure, providing DC power to one or more DC loads, and providing control and internal pathways, sharing one or more AC and/or DC power inputs. ... | 06/05/2007 |
| 7212421 | Combination feedback controller and power regulator using same A combination controller incorporates features of a classic controller and a state space controller to function as a hybrid controller unit. The PID portion of the classic controller regulates the steady state error and is separated from the pulse width modulated co... | 05/01/2007 |
| 7180210 | Standby generator integration system A standby generator integration system for efficiently integrating one or more standby generators into an operational power grid. The standby generator integration system includes a control center in communication with a plurality of control units. Each of the contr... | 02/20/2007 |
| 7170246 | Motor control apparatus A motor control apparatus supplying braking power to brake a motor comprises a braking power providing unit to receive input power having an input power voltage lower than a braking power voltage and to boost the input power voltage up to the braking power voltage t... | 01/30/2007 |
