UTILIZATION OF A SERIES RESONANT DC LINK FOR A DC MOTOR DRIVE

In this paper a high frequency series resonant de link converter is ut ilized as a de motor drive. This system generates a resonant current i n a series link and switching is done at zero current instants, reduci ng switching losses to a minimal value, A Pulse Density Modulation (PD M) strategy, utilizing a current regulator loop and an external motor speed feedback loop, controls the resonant converter. A sinusoidal inp ut fundamental current and nearly unity input power factor can be obse rved in different load conditions. The overall characteristics of the system, including such variables as maximum power, input current, star t up, and transient responses are presented by digital simulation and verified on an actual prototype system.