Michigan State University

Arizona State University

Iowa State University Research Foundation Inc

Bingsen Wang

John Frank Foss

Richard Wlezien

Ameer Janabi

Craig R Bush

A voltage conversion system including a source configured to supply a voltage and a switch capacitor circuit electrically coupled to the source. The switch capacitor circuit is configured to switch between a discharging state and a charging state. The switching between the discharging state and the charging state produces a boost to the supplied voltage. The voltage conversion system includes a capacitor in the switch capacitor circuit configured to store charge during the charging state and drain charge during the discharging state. The voltage conversion system includes a switching arrangement having a plurality of switch pairs configured to supply a converted voltage to a load. The switch capacitor circuit and the switching arrangement are interfaced to produce a unified circuit.

Systems and methods for voltage conversion implementing a switched-capacitor circuit

An improved topology is presented for a single phase power source inverter that is designed to minimize double frequency ripple. The inverter circuit includes: a capacitor coupled in parallel across a direct current (DC) voltage source; a bridge circuit having three legs electrically connected in parallel with the voltage source and each other, such that each leg of the bridge circuit being comprised of two switches coupled in series with each other; a low pass filter electrically connected between the bridge circuit and a load; an auxiliary inductor having a first terminal electrically connected to one leg of the bridge circuit and a second terminal electrically connected to another leg of the bridge circuit and the load; and a controller that drives the switches of the bridge circuit in a manner that maintains instantaneous power transfer across the bridge circuit constant.

Power source inverter for use with a photovoltaic solar panel

A maximally efficient vertical axis wind turbine (MEVAWT) includes a rotatable circular frame having upper and lower concentric flat rings or disks which support a plurality of, typically three, four, five or six, pivotable cascades, each including a plurality of fixed, configurable airfoils. The airfoils preferably include a single, pivotable trailing flap and may include lateral extensions. The center and periphery of the lower ring are supported in suitable bearings to facilitate free rotation of the frame. Wind direction and velocity sensors provide data utilized to control drive mechanisms which orient each cascade and the flap of each airfoil to maximize the resultant power produced by the turbine.

Maximally efficient vertical axis wind turbine

Some embodiments include an apparatus. The apparatus includes a DC source port having a first DC source terminal and a second DC source terminal. Further, the apparatus includes a first switch, a second switch, and a third switch having first terminals coupled together, and the apparatus includes a fourth switch between the first switch and the second DC source terminal, a fifth switch between the second switch and the second DC source terminal, and a sixth switch between the third switch and the second DC source terminal. Also, the apparatus includes a first inductor coupled between the first DC source terminal and the first terminals of the first, second, and third switches, and a power grid port having a first power grid terminal and a second power grid terminal. Other related systems and methods are also disclosed.

Growing community of inventors

Okemos, MI, United States of America

Bingsen Wang