Power-factor correction with interleaved boost converters in continuous-inductor-current mode

The operation and design trade-offs of the interleaved boost converter in continuous inductor-current mode in a high-power-factor preregulator circuit are investigated. By using interleaved converters, an overall reduction of boost inductor and electromagnetic interference (EMI) filter volume can be achieved, together with reduced switching losses. The problem of unequal load sharing between the interleaved power stages with average current control is pointed out, and a practical solution is recommended. EMI filter design considerations and experimental data taken from a 3 kW converter are presented