Abstract
Abstract
This paper presents an output-voltage-based active current-balancing method for a two-phase current sensorless
interleaved boost converter. The method supplements a previously developed robust output voltage
controller with an auxiliary balancing loop that requires neither input-current nor individual
phase-current measurements. A first-order filter reconstructs the capacitor-voltage waveform from the
measured converter output voltage. Phase-associated voltage peaks are then extracted and their difference
is processed by a proportional-integral controller. The resulting correction is added to the nominal
duty ratio of one converter phase and subtracted from that of the other, thereby reducing the average
phase-current mismatch while preserving the nominal total duty-ratio command. Simulation results for
operating conditions below and above a duty ratio of 0.5 demonstrate improved current sharing under
unequal phase inductances, winding resistances, and output-capacitor equivalent series resistance. The
method also maintains output-voltage regulation during the balancing process. These preliminary results
establish the feasibility of output-voltage-only active current balancing and motivate future experimental
validation.