Abstract: Herein provided is a controller for a current inverter. The controller comprises a reference generator configured for obtaining source voltage and current values from an electrical source, generating a voltage error function based on source and reference voltages, and generating a current error function based on source and reference currents. The controller also comprises an output controller for receiving from the reference generator the voltage and current error functions and configured for producing at least one control signal based on the voltage and current error functions. The controller also comprises a state feedback controller configured for: adjusting the at least one control signal, based on parameters of the electrical source, to produce at least one adjusted control signal, and outputting the at least one adjusted control signal to the current inverter.

Abstract: Herein provided is a controller for a current inverter. The controller comprises a reference generator configured for obtaining source voltage and current values from an electrical source, generating a voltage error function based on source and reference voltages, and generating a current error function based on source and reference currents. The controller also comprises an output controller for receiving from the reference generator the voltage and current error functions and configured for producing at least one control signal based on the voltage and current error functions. The controller also comprises a state feedback controller configured for: adjusting the at least one control signal, based on parameters of the electrical source, to produce at least one adjusted control signal, and outputting the at least one adjusted control signal to the current inverter.

Abstract: An article which becomes lubricious when wet includes a base polymer and a coating composition thereon. The composition includes a lubricating polymer and a matrix polymer which adheres to the base polymer and serves as a carrier for the lubricating polymer. The composition may also include a homogenizing polymer to enhance the compatibility of the matrix and lubricating polymer. The invention includes a method to make the article of the invention by coextruding the base polymer and the coating composition.

Abstract: A composition which includes polyvinylpyrrolidone and a polyurethane is melt processed to give a shaped article. The melt processing may be a coextrusion with a substrate polymer to give a shaped article having the composition coated on the surface thereof. The article surface is lubricious when contacted with water.

Abstract: A coating composition for an article surface includes a uniform blend of an elastomeric segmented hydrophilic polyetherurethane and a hydrophilic polymer, such as polyvinylpyrrolidone. The invention includes a method for rendering an article surface lubricious which includes coating the composition onto the article surface and contacting the coated surface with an aqueous liquid.