Abstract:  

This work studies the small-signal direct and cross-coupling audio-susceptibilities of the independent-input series-output boost converter with peak current-mode control. The converter functions in the continuous-conduction mode and comprises n-connected identical boost modules whose inputs are fed from separate voltage sources and outputs connected in series. Expressions for the module direct (self) and cross-coupling audio-susceptibilities are derived in symbolic form. The expressions explicitly show (n) as a variable and take into account the sampling action of the current loops. In addition, audio-susceptibilty frequency responses following the closure of the voltage feedback loops are generated and the influence of increasing n is discussed. Detailed simulations using PSIM are performed to support the analysis.