Electromagnetic interference (EMI) reduction in interleaved power converter

摘要

A power converter system includes an interleaved power converter 10 having a plurality of parallel-connected phase legs 16 between DC terminals and an AC terminal. A plurality of parallel-connected inductors L1, L2, L3 are each connected to one of the plurality of parallel-connected phase legs to provide a summed output of the parallel-connected phase legs to the AC terminal. A controller 14 generates PWM signals used to control the state of each of the plurality of phase legs by comparing a carrier signal to a reference signal, wherein a period of the carrier signal is randomly varied from a nominal period.