Boost Converter for Power Factor Correction of DC Motor Drive

With the increasing demand for power from the ac line and more stringent limits for power quality, power factor correction has gained great attention in recent years. A variety of circuit topologies and control methods have been developed for the PFC application. While the discontinuous conduction mode (DCM) converters such as boost and flyback converters are well suited for low power applications, continuous conduction mode (CCM) boost converters with average current mode, peak current mode or hysteresis control are commonly chosen for many medium and high power applications. Harmonic pollution and low power factor in power systems caused by power converters have been of great concern. To overcome these problems several converter topologies using advanced semiconductor devices and control schemes have been proposed. This investigation is to identify a low cost, small size, efficient and reliable ac to dc converter to meet the input performance index of UPS. The performance of single phase and three phase ac to dc converter along with various control techniques are studied and compared. This paper presents a novel ac/dc converter based on a quasi-active power factor correction (PFC) scheme. In the proposed circuit, the power factor is improved by using boost dc to dc converter. It eliminates the use of active switch and control circuit for PFC, which results in lower cost and higher efficiency. A Matlab/Simulink based model is developed and simulation results are presented. Finally a DC motor load is applied and simulation results are presented.