University of Central Florida Research Foundation, Inc.

Haibing Hu

Issa E Batarseh

Nasser Kutkut

Zheng John Shen

Seyed-Milad Tayebi

Ahmadreza Amirahmadi

John Shen

Raed Bkayrat

Mingyao Ma

Xiang Fang

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 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 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.

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Orlando, FL, United States of America

Haibing Hu