ANALYSIS AND CONTROL OF A CELLULAR CONVERTER SYSTEM WITH STOCHASTIC RIPPLE CANCELLATION AND MINIMAL MAGNETICS

A parallel converter architecture based on the resonant pole inverter (RPI) topology is presented. It is shown that this architecture minimi zes the output magnetics required for current sharing. A new current c ontrol scheme is introduced which reduces peak currents, losses, and o utput voltage ripple for many operating conditions, This new control m ethod is applicable to both the single RPI and the parallel architectu re, Additionally, the paper analytically quantifies the degree of pass ive ripple cancellation between cells of a parallel architecture. It i s shown that the rms ripple current of an N-cell paralleled converter system is a factor of 1/root N lower than for an equivalent single con verter. These results are verified using a piecewise-linear model. We conclude that the parallel architecture overcomes some of the major di sadvantages of the conventional RPI.