Power Electronics

POWER electronics

HIGH CURRENT VOLTAGE REGULATOR

United States Patent 7,907,430

Issued March 15, 2011

A linear voltage regulator that includes on its input side an array of switched super capacitors coupled between the power source and the load. This apparatus is capable of delivering currents typically from milliamperes to greater than several amperes at very low switching frequencies. In addition, by using capacitors rather than resistors or transistor devices to drop voltage on the input side, power consumption is reduced. The array of capacitors is switched by simple analog circuitry or a switching logic with or without a processor subsystem and the capacitors themselves are of the super capacitor type, thus providing very high capacitance, and are effectively series connected during certain phases of operation with the input terminal of the conventional linear voltage regulator portion of the apparatus. Energy stored in the super capacitors during the various phases of operation is reused.

Inventors: Kularatna; Nihal (Auckland, NZ), Fernando; Lewis Jayathu (Kalutara, LK)

Assignee: WaikotoLink Limited (Hamilton, NZ)

Appl. No.: 12/338,723

Filed: December 18, 2008

STEP-DOWN CONVERTER HAVING A RESONANT INDUCTOR, A RESONANT CAPACITOR AND A HYBRID TRANSFORMER

Issued March 29, 2011

United States Patent 7,915,874

Unlike buck converter and tapped-inductor buck converters, which use only inductive energy transfer, the present invention employs the capacitive energy transfer in addition to inductive energy transfer. The hybrid transformer performs the double duty simultaneously: transfers the input inductive energy storage to the load through a taped-inductor turns ratio n but also transfers the resonant capacitor discharge current to the load during OFF-time interval amplified by turns ratio “m” of the hybrid transformer. Despite the presence of the resonant inductor current during the OFF-time interval, the output voltage is neither dependent on resonant component values nor on the load current as in conventional resonant converters, but depends on duty ratio “D” and turns ratio “n” of the hybrid transformer. Hence a simple regulation of output voltage is achieved using duty ratio control.

Inventors: Cuk; Slobodan (Laguna Niguel, CA)

Assignee: Cuks, LLC (Irvine, CA)

Appl. No.: 12/924,743

Filed: October 4, 2010

SWITCHING INVERTERS AND CONVERTERS FOR POWER CONVERSION

Issued April 12, 2011

United States Patent 7,924,580

A switching inverter having two single-ended EF.sub.2 inverter sections coupled together with a shared ground and partially shared tunable resonant network that is coupled to at least one load, wherein each inverter section comprises a switching section, and wherein the shared tunable network section allows independent tuning of an impedance seen by the corresponding switching section thereby independently tuning even and odd harmonics of the switching frequency.

Inventors: Glaser; John Stanley (Niskayuna, NY), Davila; Juan Manuel Rivas (Niskayuna, NY)

Assignee: General Electric Company (Niskayuna, NY)

Appl. No.: 12/549,433

Filed: August 28, 2009

SEMICONDUCTOR DEVICE COMPRISING AN IN-CHIP ACTIVE HEAT TRANSFER SYSTEM

Issued April 12, 2011

United States Patent 7,924,569

By providing thermoelectric elements, such as Peltier elements, in a semiconductor device, the overall heat management may be increased. In some illustrative embodiments, the corresponding active cooling/heating systems may be used in a stacked chip configuration to establish an efficient thermally conductive path between temperature critical circuit portions and a heat sink of the stacked chip configuration.

Inventors: Letz; Tobias (Dresden, DE)

Assignee: Advanced Micro Devices, Inc. (Austin, TX)

Appl. No.: 12/551,766

Filed: September 1, 2009

METHOD AND APPARATUS FOR TRANSFERRING ENERGY IN A POWER CONVERTER CIRCUIT

Issued April 12, 2011

United States Patent 7,924,132

A reduced cost energy transfer element for power converter circuits. In one embodiment, an energy transfer element according to an embodiment of the present invention includes a magnetic element having an external surface with at least a first winding and a second winding wound around the external surface of the magnetic element without a bobbin. As such, energy to be received from a power converter circuit input is to be transferred from the first winding to the second winding through a magnetic coupling provided by the magnetic element to a power converter circuit output.

Inventors: Polivka; William M. (Campbell, CA), Matthews; David Michael Hugh (Windsor, GB)

Assignee: Power Integrations, Inc. (San Jose, CA)

Appl. No.: 12/349,414

Filed: January 6, 2009

ELECTRO THERMAL IN SITU ENERGY STORAGE FOR INTERMITTENT ENERGY SOURCES TO RECOVER FUEL FROM HYDRO CARBONACEOUS EARTH FORMATIONS

Issued February 3, 2009

United States Patent 7,484,561

The vast North American oil shale and tar sand deposits offer the potential to make USA energy independent. However, if these deposits were produced by the existing combustion processes, substantial CO2 emissions would be injected in to air. To avoid this green house gas problem and yet produce liquid fuels, an electro-thermal energy storage system that may be wind-powered is described. It stores the unpredictable, intermittent (e.g., wind) electrical energy over long periods as thermal energy in fossil hydrocarbon deposits. Because the thermal diffusion time is very slow in such deposits, the thermal energy is effectively trapped in a defined section of a hydrocarbon deposit. This allows time for the thermal energy to convert hydrocarbons into gaseous and liquid fuels. It can also use a portion of the fuel to regenerate electrical power into the electrical grid of higher energy content than was initially stored. In addition, the method can increase the reliability of the grid and provide a load leveling function.

Inventors: Bridges; Jack E. (Park Ridge, IL)

Assignee: Pyrophase, Inc. (Chicago, IL)

Appl. No.: 11/708,912

Filed: February 20, 2007

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