Magnetically Coupled Multilevel Converter
Magnetically Coupled Multilevel Converter (MCMC) is based on a highly coupled parallel autotransformer and stepped pattern PWM control. It's highly efficient, purely switched mode architecture has bandwidth capabilities exceeding 100 MHz and slew rates almost equal to those produced by the switching stage itself. Effective inductance seen by each switching node (differential inductance) is high, facilitating operation with low current ripple, while forward inductance separating switching stages from the load (common mode or forward inductance) is very low. With total effective output inductance in a range of 1nH (for the 16 step version) very fast small and large signal bandwidth is feasible with excellent stability and accuracy. At the same time each switching stage sees effective differential inductance of several uH (typical ratio between differential and common mode inductance is over 1000). Magnetically forced current sharing eliminates current sensing for balancing purposes. Possible operation with very small to no output capacitance.