‎This paper develops a basic theory of $H$-groups‎. ‎We‎ ‎introduce a special quotient of $H$-groups and‎ ‎extend some algebraic constructions of topological groups to the category‎ ‎of H-groups and H-maps and then present a functor from this category to the category of quasitopological groups‎.

Dc-ac inverters are needed in many applications. The full-bridge dc-ac inverter has been widely used in industry applications and trough the literature. If the nature of the load is not known a priori, some considerations should be taken in order to assure the quality of service to be provided by the inverter. When nonlinear loads are fed by a full-bridge dc-ac inverter, odd harmonics of the fu...