.1 Kw Active Power Factor Correction Developed

This thesis is focused on the design and implementation of the active power factor corrector (APFC). Various types of APFC topologies and several control schemes are also discussed and compared. Finally, bridge rectifier and boost converter based circuit and the average current mode control with a constant switching frequency is adopted. The main objective is to reduce the input current harmonics and to achieve a unity power factor.The main advantages for the proposed corrector are high power factor, low voltage stress of the bulk capacitors, and the output voltage regulation.In this thesis, how to improve the AC-DC converter input current waveform,reduce electromagnetic interference and equipment capacity, reduce the harmonic components and improve power factor, improve energy efficiency in the use of electricity have been discussed. Besides, the basic principles of APFC has been in-depth analyzed, the circuit implementation is explored and investigated for non-reducible dielectrics.The main results are as follows:1. Enumerate various types of PFC, including the circuit diagram, the output waveform.2. Contrast with these circuits, the Boost+CCM circuit is the most suitably optimization for the single-phase, medium, high power supply.3. The analysis of the UC2854N features and its modular design.4. The 1-kW APFC prototype developed based on the UC2854N,IR1150S control ICs, introduces the detailed design steps, methods and some experiences. Satisfactory experimental results confirm the validity and feasibility of the adopted scheme. Potential future works are mentioned to further improve the power supply's power level and conversion efficiency.