Study on an interleaved buck power factor corrector with GaNFET and integrated inductor

In this paper, the interleaved buck power factor corrector is analyzed. The control method of clamping current, constant frequency and interleaved phases with 180° is adopted in this converter. The interleaved buck power factor corrector has the properties such as high power density, low input and output current ripples and EMI filter is easy to be designed. In this converter with the interleaved control method, two inductors are integrated into one to have low core loss. The high switching frequency (300kHz) is applied to reduce the circuit size. There are two methods provided to raise the circuit efficiency. One is the usage of wide-bandgap power switches to decrease the switching loss, the other is optimal design for phase management to reduce the circuit loss. Experimental results obtained on a 300-W and 80-V output converter which can operate with universal input is provided.