In recent years, direct current power (DC) supply systems have been applied in various types of industrial equipment. As a common practice, an alternating current(AC)/DC converter will be introduced at the system front end to convert mains into DC power sources for system operation. However, when connecting to a power grid, under the influence of load-end characteristics, the phase difference between the voltage and current of the input AC power source will increase. This decreases the power factor (PF), reduces power quality, and affects the stability of system operation. In this paper, three types of circuit topologies (traditional, bridgeless, and interleaved boost) for power factor correction converters are compared and discussed. Moreover, features as well as pros and cons of these topologies are analysed. Finally, a prototype for each topology is studied and implemented. Further, the efficiency, PF, current harmonic distortion, and ripple are compared and examined based on experimental results.