A novel closed loop operated soft switched DC to DC converter fed DC motor for electric vehicles

摘要

A new feedback control scheme of DC motors which can can be easily implemented using PWM DC-DC power converters is proposed. This control minimizes the switching losses, eliminates electromagnetic interference (EMI) and improves efficiency. The simulation of the open loop and closed loop operations of a buck-boost constant frequency (CF) zero voltage switching (ZVS) quasi-resonant power converter (QRC) feeding a DC motor is discussed in the present work. The above operations are accomplished by controlling the free wheeling period of the resonant inductor. A PI controller is designed to get better performance under load conditions. DC motors fed by this converter find applications in battery operated vehicles and aerospace control systems. The software package PSPICE A/D is used for simulation.