Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 8164929 | Controlled contactless power transmission An inductive coupled power transmission circuit has a rotating transformer, including an AC voltage supply for feeding an AC voltage via a series capacitor into the primary winding of said rotating transformer and a load being coupled to the secondary winding of sai... | 04/24/2012 |
| 8154890 | Inverter apparatus with control and voltage-sag circuitry to quickly restart when recovering from a mini power failure An inverter apparatus converts a DC power of a capacitor charged via a rectifier circuit connected to a first AC power system into an AC power, and supplies the AC power to a second AC power system. The inverter apparatus includes a discharge circuit, a control circ... | 04/10/2012 |
| 8102682 | Power supply control circuit for an inductive coil used to heat a tool shrink attachment A circuit 1 for controlling the supply of electrical power to an induction coil 2, in particular to an induction coil 2 for heating a shrink attachment for tools, comprises a rectifier 3, having an input 3a, 3b, | 01/24/2012 |
| 8045345 | Power converting apparatus A detected DC voltage value estimation mechanism samples detected DC voltage values at specific intervals of a period T, stores detected DC voltage values Vn to Vn−m detected at a present time tn up to a sampling time tn−m | 10/25/2011 |
| 7957164 | Power device for supplying AC voltage to a load having a discharge part The present invention provides a power device including a converter part (2) for converting an AC voltage to a DC voltage; an inverter part (3) for converting the DC voltage outputted from the converter part (2) to the AC voltage; and a transfor... | 06/07/2011 |
| 7948778 | Self-testing power supply apparatus, methods and computer program products A power supply apparatus includes first and second parallel-connected uninterruptible power supplies (UPSs), each including an AC/DC converter circuit and a DC/AC converter circuit having an input coupled to an output of the AC/DC converter circuit by a DC link, inp... | 05/24/2011 |
| 7929322 | Voltage sag generator device A voltage sag generator device for use in an electrical generator machine such as a wind turbine, connected to an electrical network including one to three parallel transformers connected on one side to the wind turbine via a coupling switch and circuit breakers, an... | 04/19/2011 |
| 7804697 | History-independent noise-immune modulated transformer-coupled gate control signaling method and apparatus A history-independent and noise-immune modulated transformer-coupled gate control signaling method and apparatus provides robust design characteristics in switching power circuits having a transformer-coupled gate drive. A modulated control signal at a rate substant... | 09/28/2010 |
| 7800924 | Power converter apparatus and methods using neutral coupling circuits with interleaved operation A power converter apparatus, such as an uninterruptible power supply (UPS), includes an inverter having an input coupled to a first DC bus and a second DC bus and configured to generate an AC output with respect to a neutral terminal at a phase output terminal there... | 09/21/2010 |
| 7684217 | Polyphase inverter, control method thereof, air sending device and polyphase current output system Capacitors act as bootstrap capacitors of a high side control circuits. The capacitors are charged in a period in which all of high arm switching devices are non-conductive, so-called in a precharge period. When any of U-phase current, V-phase current and W-phase cu... | 03/23/2010 |
| 7679940 | Three-phase voltage source inverter system The present invention provides a three-phase voltage source inverter system capable of obtaining a nearly sinusoidal output waveform while minimizing apparatus size increase and cost increases. The three-phase voltage source inverter system of the present invention ... | 03/16/2010 |
| 7656687 | Modulated transformer-coupled gate control signaling method and apparatus A modulated transformer-coupled gate control signaling method and apparatus provides reduction of circuit complexity and robust design characteristics in switching power circuits having a transformer-coupled gate drive. A modulated control signal at a rate substanti... | 02/02/2010 |
| 7626835 | Plasma lighting system and control method thereof A plasma lighting system comprising a storage unit for storing duty ratios of first and second switching signals according to each material within a bulb by an experiment, a controlling unit for detecting an optimal duty ratio from the storage unit and outputting th... | 12/01/2009 |
| 7619905 | Method of controlling connection of a supply of AC power to a load and to a power supply grid A method of controlling connection of an AC power output to a load and power supply grid. The power output is produced by an AC power generating system which includes an AC/AC converter and is independently operable to supply power to the load. The converter is cont... | 11/17/2009 |
| 7619906 | System for precharging a DC link in a variable speed drive A variable speed drive with a converter that is controllable to precharge a DC link is provided. The variable speed drive also includes an inverter. The converter converts a fixed line frequency, fixed line voltage AC power from an AC power source into DC power. The... | 11/17/2009 |
| 7613018 | Apparatus and method for supplying DC power source An apparatus and method for supplying a direct current power source which is capable of compensating a power factor of an input power source by detecting an input current amount according to load changes, the apparatus comprising an input current detecting unit for ... | 11/03/2009 |
| 7599200 | Electric power converter In an electric power converter, a main circuit unit and a control unit are detachably attached to each other, and another control unit differing in a control manner can be newly attached to the single main circuit unit. Moreover, the main circuit unit include... | 10/06/2009 |
| 7564703 | Method and apparatus for synchronized parallel operation of PWM inverters with limited circulating current An apparatus and method for converting DC voltage across positive and negative DC buses to three phase AC voltages on first, second and third AC output lines, the method comprising the steps of providing first and second three phase inverters that include a first su... | 07/21/2009 |
| 7558086 | Inverter control circuit with a resonant frequency modulation function An inverter control circuit with a resonant frequency modulation function provides a control circuit module that can modulate different resonant frequencies externally to fit loads of different modes without changing the inverter components such as a voltage transfo... | 07/07/2009 |
| 7558085 | Power converter with an adjustable output cable The present invention relates to a power converter for supply of electrical power to an aircraft on the ground. More specifically it relates to a power converter comprising a housing enclosing a frequency converter for provision of a stabilized multi-phase alternati... | 07/07/2009 |
| 7532490 | Converter topology and methods for interfacing an electrical machine to electrical power grid A power converter for coupling an electrical machine to an electrical grid includes a machine side converter and a grid side converter, each, side having a plurality of corresponding stages for converting a three-phase electrical signal of the electrical machine to ... | 05/12/2009 |
| 7532491 | Apparatus and method for supplying DC power source An apparatus and method for supplying a direct current power source capable of compensating a power factor of an input power source by increasing and decreasing energy required by load changes, the apparatus comprising: an input current detecting unit for detecting ... | 05/12/2009 |
| 7518890 | AC/DC/AC converter with reduced inductance in the DC filter capacitors A frequency converter in which the inductance is reduced by enlarging the forms of bus bars which connect a P phase, an N phase of an inverter part and a positive electrode or a negative electrode of smoothing capacitors and the form of a wiring bus bar which connec... | 04/14/2009 |
| 7477530 | Frequency converting apparatus and control method for the apparatus The difference between internal processes of a power converting apparatus may bring about a heat difference in the apparatus. In the cooling process, it is presumed that the temperature change of the inverter or converter module may be made so great that the power c... | 01/13/2009 |
| 7443125 | Power conversion apparatus A power conversion apparatus for converting power from an alternating source to dc includes an input stage for receiving power from the alternating source, which includes an input filter, a rectifier for rectifying the alternating signal, a capacitor for storing ene... | 10/28/2008 |
| 7436147 | Motor driving apparatus A motor driving apparatus drives a motor by means of an AC/AC direct converter such as a matrix converter. The motor driving apparatus is provided with a current detecting section for detecting motor currents, a comparing section for detecting whether motor current ... | 10/14/2008 |
| 7436842 | Outlet with analog signal adapter, a method for use thereof and a network using said outlet An outlet for a Local Area Network (LAN), containing an integrated adapter that converts digital data to and from analog video signal. Such an outlet allows using analog video units in a digital data network, eliminating the need for a digital video units or externa... | 10/14/2008 |
| 7432611 | Power control interface between a wind farm and a power transmission system A power control interface between an unstable power source such as a wind farm and a power transmission line employs an electrical energy storage, control system, and electronic compensation module which act together like an “electronic shock absorber” for stori... | 10/07/2008 |
| 7430132 | Medium voltage inverter system A medium or high voltage multi-inverter system is described, in which multiple inverter cells are included in a phase line to increase the voltage level supported by the system, and support higher voltage loads such as AC three-phase motors. In one configuration, fi... | 09/30/2008 |
| 7425806 | System and method for controlling a variable speed drive A variable speed drive is provided having a converter to convert an AC voltage to a DC voltage, a DC link to filter and store energy from the converter, and a plurality of inverters. Each inverter is configured to convert a DC voltage to an AC voltage and is electri... | 09/16/2008 |
| 7403403 | Noise suppressor A noise suppressor capable of preventing degradation in an attenuation characteristic by a parasitic component so as to obtain a favorable attenuation characteristic is provided. The noise suppressor includes a first winding wire disposed on a first current-carrying... | 07/22/2008 |
| 7394672 | Drive system for a vehicle moving along a trackway, particularly a magnetic levitation train A drive system for a vehicle moving along a trackway, particularly a magnetic levitation train, includes a linear motor which has a stator extending along the trackway, and can be connected to a three-phase output voltage of an output transformer. An electrical powe... | 07/01/2008 |
| 7391132 | Methods and apparatus providing double conversion/series-parallel hybrid operation in uninterruptible power supplies An uninterruptible power supply (UPS) includes an AC power source, a DC power source coupled to a DC bus, a load, a converter, an inverter and a controller. Responsive to the controller, the inverter receives power from the DC bus to supply the load a regulated volt... | 06/24/2008 |
| 7372709 | Power conditioning system for energy sources Apparatus for conditioning power generated by an energy source includes an inverter for converting a DC input voltage from the energy source to a square wave AC output voltage, and a converter for converting the AC output voltage from the inverter to a sine wave AC ... | 05/13/2008 |
| 7368832 | Circuit and fault tolerant assembly including such circuit A circuit is provided that provides for the same power characteristics to an assembly of electrical resistive elements wired in parallel as to the assembly as wired in series. An input power source provides electrical resistive power to a plurality of load elements,... | 05/06/2008 |
| 7365515 | Universal battery charger To provide a universal battery charger with low power consumption during a standby condition and a rush current suppressing capability at the time of commencement of charging, a voltage slightly larger than a battery voltage is produced and applied to the battery. T... | 04/29/2008 |
| 7358620 | Methods and apparatus for ride-through operation of a complementary device to a transient power source In accordance with certain exemplary embodiments, the present technique provides methods and apparatus for providing operating power to a complementary device to an induction device based uninterruptible power source (UPS) via a direct current (dc) bus. In one embod... | 04/15/2008 |
| 7352597 | Comprehensive power quality controller for substation in power system This invention disclosed is a comprehensive power quality controller for substation in the electric power system and includes a Thyristor Controlled Reactor (TCR), pure tuned passive filter Zf, additional inductor L active power filter (APF), and a coupli... | 04/01/2008 |
| 7345431 | Circuit structure for driving a plurality of cold cathode flourescent lamps A DC/AC converter circuit structure for driving a plurality of cold cathode fluorescent lamps is described. A common-mode choke is used between the cold cathode fluorescent lamps. The common-mode choke balances the currents respectively flowing through the cold cath... | 03/18/2008 |
| 7341697 | Reaction cell and operation method thereof A reaction cell is provided with a vessel-like cell main body and a circular piezoelectric/electrostrictive oscillator fixed to an outside of a bottom surface of the cell main body. The cell main body includes a circular bottom plate portion and a circumferential wa... | 03/11/2008 |
