Analysis and Design for 5KW Power Factor Corrected Converter

In this paper, a 5KW power factor corrected (PFC) converter for wide voltage input range is designed. The converter, which is applied to frequency-variable conversion air conditioner, adopts two phase interleaved boost converter. The circuit operates in current continuous conduction mode (CCM), and use voltage outer loop and current inner loop control strategy, i.e., current inner loop using average current control, voltage outer loop using the PI control strategy with input voltage feed-forward .In order to verify the feasibility of the proposed scheme, a 5KW boost PFC prototype, which converting universal ac input voltage to 400V dc output, is implemented by using a TI IC of UCC28070. The experimental results is satisfactory, which demonstrate a power factor greater than 0.97, THD less than 5% and efficiency more than 99.4% at 41.67 kHz switching frequency and 220V input voltage from 1.27KW to 4.889kW.