Power Electronics



Issued May 11, 2010

United States Patent 7,714,547

The teachings presented herein provide a method and apparatus for operating constant on-time DC/DC converters, including pseudo constant on-time variants, with a virtual current-mode slope signal. Use of the slope signal provides, among other advantages and improvements, greater noise immunity and the ability to operate with a wider range of converter output filters. More particularly, incorporating a properly synchronized slope signal into the on-time triggering comparison provides for a maximum slope offset at on-time triggering. Doing so prevent double-pulsing (i.e., erroneous on-time retriggering) and other undesirable behavior of conventional constant on-time DC/DC converters and, as a particular but non-limiting advantage, allows ready and advantageous use of the slope-compensated converter as taught herein with low ESR capacitors in the output filter.

Inventors: Fogg; John Kenneth (Cary, NC), Kashikar; Pankaj (Raleigh, NC)

Assignee: SEMTECH Corporation (Morrisville, NC)

Appl. No.: 12/188,613

Filed: August 8, 2008


Issued June 8, 2010

United States Patent 7,733,261

A hybrid analog to digital converter circuit for a feedback input to a digital controller of a power supply includes a high resolution, analog to digital converter circuit in communication with a voltage error signal. The high resolution analog to digital converter circuit is configured to provide a first correction signal to the digital controller when the voltage error signal is within a first error range. The hybrid analog to digital converter circuit also includes at least one flash analog to digital converter circuit in communication with the voltage error signal. The flash analog to digital converter circuit(s) is configured to provide at least a second correction signal to the digital controller when the voltage error signal is within at least a second error range.

Inventors: Bhakta; Bhavesh (Richardson, TX), Yousefzadeh; Vahid (Boulder, CO)

Assignee: Texas Instruments Incorporated (Dallas, TX)

Appl. No.: 12/211,526

Filed: September 16, 2008


Issued June 8, 2010

United States Patent 7,733,658

A power platform assembly is provided to convert available AC power into power suitable to power SINCGARS radio components. The platform includes a horizontal base for supporting up to two SINCGARS radios and a carriage assembly supported above the base to provide support for up to two radio frequency power amplifiers. Connectors, internal wiring, and electrical components inside the platform provide power and electrical connections between components within and connected to the platform. Ancillary electronics and connectors provide for remote audio monitoring of communications via an LS-671 external speaker, or equivalent external speaker arrangement. The platform allows various types of available AC power, as may vary across different regions of the world, to power the radios and radio frequency power amplifiers, while allowing others in a secure vicinity of the platform to hear incoming and outgoing voice transmissions without draining the batteries powering the radios.

Inventors: Perkins, III; Frank Norvel (Huntsville, AL), Taylor; Jeffrey Keith (Joppa, AL), Weddendorf; Bruce Charles (Huntsville, AL), Childs; Lloyd W. (Owens Cross Roads, AL)

Assignee: Perkins Technical Services, Inc. (Huntsville, AL)

Appl. No.: 11/748,770

Filed: May 15, 2007


Issued June 8, 2010

United States Patent 7,733,651

The invention relates to a heat sink arrangement with a heat sink element, with a cylindrical interior, in particular a housing of an electric motor or housing part for such, with power electronics integrated into the housing or housing part, with at least one electronics component attached to the heat sink element from inside, in which the heat sink element is a sector of a cylinder adapted to the cylindrical interior of the heat sink arrangement, and that a springy clip is present that presses onto the ends of the sector such that the heat sink element is pressed against the cylindrical interior by spreading, as well as to an electric motor, a housing part and a springy clip.

Inventors: Hogg; Mario (Stuhlingen, DE), Kaiser; Bernhard (Bonndorf, DE)

Assignee: Dunkermotoren GmbH (Bonndorf/Schwarzwald, DE)

Appl. No.: 11/773,762

Filed: July 5, 2007


Issued June 8, 2010

United States Patent 7,733,183

Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.

Inventors: Komijani; Abbas (Los Angeles, CA), Hajimiri; Seyed-Ali (Pasadena, CA), Kee; Scott D. (Dana Point, CA), Aoki; Ichiro (San Clemente, CA)

Assignee: California Institute of Technology (Pasadena, CA)

Appl. No.: 12/069,263

Filed: February 8, 2008


Issued June 8, 2010

United States Patent 7,734,317

Systems and techniques are disclosed relating to wireless communications. The systems and techniques involve an efficient power source for prolonged battery life. The power source may include first and second batteries, and a power management module configured to operate each of the first and second batteries in a pulse current discharge mode while supplying continuous current to a load.

Inventors: Patel; Jagrut V. (San Diego, CA), Choe; Vyungchon (San Diego, CA)

Assignee: QUALCOMM Incorporated (San Diego, CA)

Appl. No.: 10/776,437

Filed: February 10, 2004

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