University of Central Florida Research Foundation, Inc.

Astec International Limited

Petra Solar, Inc.

Issa E Batarseh

Ghaith Haddad

Hong Mao

Rashad Oreifej

Rawad Al-Haddad

Haibing Hu

Jaber A Abu Qahouq

Nasser Kutkut

Peter Kornetzky

Xiangcheng Wang

Jaber A Abu-Qahouq

Kasemsan Siri

Edward R Stanford

Shamala Chickamenahalli

Wasfy Mikhael

Raghuram Ranganathan

Shiguo Luo

Wenkai Wu

Weihong Qiu

Zhihua Qu

Samuel Richie

Ehab Shoubaki

Shadi Harb

Seyed-Milad Tayebi

Wei Gu

Ahmadreza Amirahmadi

Zheng John Shen

Utsav Somani

Wenkal Wu

Charles Jourdan

Moussaoui Zaki

Ozlem Garibay

Xiang Fang

Mohamed Tamasas Elrais

Mingyao Ma

Huai Wei

Hussam Al-Atrash

John Shen

Khalid Rustom

Raed Bkayrat

Liangbin Yao

Weihong Qui

A multiport multilevel converter/inverter includes a connection point with a two-line connection. The multiport multilevel converter/inverter also includes a capacitor electrically coupled across the two-line connection of the connection point. The multiport multilevel converter/inverter also has a first flying capacitor multilevel path with a first external two connection port configured to connect outside of the multiport multilevel converter/inverter, and a first interface conveying DC power and that is electrically coupled to the connection point. The multiport multilevel converter/inverter also includes a second flying capacitor multilevel path with a second external two connection port configured to connect outside of the multiport multilevel converter/inverter, and a second interface conveying DC power and that is electrically coupled to the connection point.

GaN-based multiport multilevel converter/inverter

A two-stage microinverter for coupling a PV panel to a power grid includes a DC/DC converter stage having an input for coupling to the PV panel and a DC/AC inverter stage that has an output for coupling to the grid, with at least one DC link capacitor between the DC/DC converter and DC/AC inverter stage. A synchronous controller that includes a loop compensator coupled to a mixer is between an analog-to-digital converter (ADC) and a phase-locked loop (PLL) for coupling to an output voltage from the grid. The ADC receives a DC link voltage from the DC link capacitor. An output of the PLL is for controlling a timing of sampling by the ADC of the DC link voltage so that the ADC samples the DC link voltage when an AC component of a ripple voltage on the DC link voltage intersects an average value of the DC link voltage.

Synchronous sampling DC link voltage control for microinverters

A multi-input power DC-DC converter includes a first and second bridge circuit for receiving power from a first and second electric power source. The first bridge circuit includes a first power switches with a first switch output node in between, and a second bridge circuit for receiving power from a second electric power source including second power switches with a second switch output node in between. At least one of the first and second electric power source is a photovoltaic (PV) panel. A single LLC resonant tank coupled to both the first and second output node is configured together with a transformer including a secondary winding and a primary winding that provides a magnetizing inductance which provides a second inductance for the single LLC resonant tank. A rectifier is coupled to the secondary winding.

Multi-input single-resonant tank LLC converter

A computing device may include a display, a memory to store electronic textbook data comprising a plurality of different images associated with at least one location within the electronic textbook data, a user input device, and a processor coupled to the display, the memory, and the user input device. The processor may be configured to display the electronic textbook data with a primary image from among the plurality of different images at the at least one location on the display, and selectively replace the primary image with at least one secondary image from among the plurality of different images at the at least one location on the display based upon the user input device.

Computing device providing electronic book data with rolling images and related methods

A computer system may include a server(s) for storing electronic textbook data and a plurality of computing devices each including a display, a memory, a user input device, and a processor. The processor may display the electronic textbook data on the display, receive comment data from a respective user of the computing device with respect to the electronic textbook data, and provide the comment data to the server(s). The server(s) may be configured to distribute the comment data among the plurality of computing devices. The processor of each computing device may be configured to receive a respective user rating for the distributed comment data and provide the user rating to the server(s). The server(s) may be configured to permanently incorporate given distributed comment data into the electronic textbook data when the user ratings for the given distributed comment data reach a rating threshold.

Computer system providing collaborative learning features and related methods

A computing device may include a display, a memory to store electronic textbook data comprising at least one configurable problem to be solved for a system having a plurality of different parameters, a user input device, and a processor coupled to the display, the memory, and the user input device. The processor may be configured to display the electronic textbook data with the at least one configurable problem on the display, selectively change at least one of the parameters of the system to define a new solution for the at least one configurable problem based upon the user input device, and display the new solution on the display.

Computing device providing electronic book data with configurable problems and changeable parameters and related methods

A computing device may include a display, a memory to store electronic textbook data comprising at least one configurable problem to be solved using a given solution technique from among a plurality of different solution techniques, a user input device, and a processor coupled to the display, the memory, and the user input device. The processor may be configured to display the electronic textbook data with the at least one configurable problem on the display, selectively change the given solution technique for the at least one configurable problem based upon the user input device, and display a solution for the at least one configurable problem on the display responsive to the change in the given solution technique.

Computing device providing electronic book data with configurable problems and changeable solution techniques and related methods

A system connected to an AC power grid having an AC phase signal includes an inverter module including a first inverter coupled to a DC voltage, actuated based on the AC phase signal. The first inverter provides a first voltage signal having predetermined harmonic components. A second inverter includes second switch elements coupled to the DC voltage and actuated by a second set of control signals phase delayed with respect to the first control signals. A transformer module has first and second primary windings coupled to the first and second inverters. The transformer module further includes a secondary winding coupled to first primary winding, the second primary winding, and the AC power grid. The secondary winding is configured to provide a secondary output voltage to the AC power grid by combining the first voltage signal and the second voltage signal such that the predetermined harmonic components are substantially cancelled.

Modular inverter system

A power inverter combination includes a half-bridge power inverter including first and second semiconductor power switches receiving input power having an intermediate node therebetween providing an inductor current through an inductor. A controller includes input comparison circuitry receiving the inductor current having outputs coupled to first inputs of pulse width modulation (PWM) generation circuitry, and a predictive control block having an output coupled to second inputs of the PWM generation circuitry. The predictive control block is coupled to receive a measure of Vin and an output voltage at a grid connection point. A memory stores a current control algorithm configured for resetting a PWM period for a switching signal applied to control nodes of the first and second power switch whenever the inductor current reaches a predetermined upper limit or a predetermined lower limit.

Hybrid zero-voltage switching (ZVS) control for power inverters

A power inverter includes a DC/AC inverter having first, second and third phase circuitry coupled to receive power from a power source. A controller is coupled to a driver for each of the first, second and third phase circuitry (control input drivers). The controller includes an associated memory storing a phase skipping control algorithm, wherein the controller is coupled to receive updating information including a power level generated by the power source. The drivers are coupled to control inputs of the first, second and third phase circuitry, where the drivers are configured for receiving phase skipping control signals from the controller and outputting mode selection signals configured to dynamically select an operating mode for the DC/AC inverter from a Normal Control operation and a Phase Skipping Control operation which have different power injection patterns through the first, second and third phase circuitry depending upon the power level.

Power inverter implementing phase skipping control

A computing device may include a display, a memory to store electronic book data having a plurality of different content layers each associated with a different content difficulty level, and a processor coupled to the display and the memory. The processor may determine a selected content difficulty level for viewing of the electronic book data, and display on the display the respective content layer of the electronic book data associated with the selected content difficulty level.

Computing device providing electronic book data having selectable content layers with different difficulty levels and related methods

A computer system may include a plurality of computing devices each including a display, a memory to store electronic book data comprising at least one configurable problem to be solved, and a processor coupled to the display and the memory. The processor may display the electronic book data with the at least one configurable problem on the display, and apply a changeable seed value to the at least one configurable problem to change an answer associated with the at least one configurable problem.

Computing device providing electronic book data with configurable problems and changeable seed values and related methods

A multi-transformer LLC (resonant) power converter having at least two transformers including a first Tand a second transformer Tin series includes a switch network configured for receiving input power including a first and second switched node. Resonant circuitry is coupled between the first and second switched node including a series combination of an inductor, a capacitor, a primary winding of Tand a primary winding of a T. At least one switch is operable for providing a first mode that includes Tin the resonant circuitry and a second mode that excludes Tfrom the resonant circuitry. Secondary windings of Tand Tare connected electrically in parallel for driving an output capacitor (Co) through respective rectifiers which provide conversion from AC to DC.

Resonant power converter having switched series transformer

Interactive and real time web-based electrical circuit symbolic solvers and simulators. The invention includes an interactive and innovative graphical user interface (GUI) for creating circuit schematics and generating netlists, circuits symbolic solving and instant simulated solutions, their systems and methods. Users such as students can use GUI interfaces to remotely access a remote server controlled by educational institutions such as universities, or electronic book publishers, in order to draw, symbolically solve, and instantly simulate electrical circuits.

Symbolic switch/linear circuit simulator systems and methods

A method for controlling a photovoltaic (PV) panel in a PV system including a computing device that provides motor control signals and implements an iterative adaptive control (IAC) algorithm for adjusting an angle of the PV panel. The IAC algorithm relates P at a current time k (P(k)), an elevation angle of the PV panel at k (&#x3b8;(k)), P after a next step (P(k+1)) and an elevation angle of the PV panel at k+1 (&#x3b8;(k+1)). The algorithm generates a perturbed power value P(k+1) to provide a power perturbation to P(k), and calculates &#x3b8;(k+1) using P(k+1). The motor control signals cause the motor to position the PV panel to achieve &#x3b8;(k+1). A change in P resulting from the positioning is compared to a predetermined change limit, and only if the change in P is &#x2267; the change limit, again sensing P, and repeating the generating, calculating and positioning.

Method of adaptive solar tracking using variable step size

Growing community of inventors

Oviedo, FL, United States of America

Issa E Batarseh