Model predictive control of multiphase interleaved DC-DC converters with sensorless current limitation and power balance

The present paper investigates the control of interleaved DC-DC converters. It proposes an alternative solution to balance the currents between the legs without using current transducer, relying instead on a feedback loop based on the measurement of the capacitor voltage ripple. The appropriate measurement circuit is proposed. The voltage control uses a model predictive control scheme, which assumes the average model of a single leg converter, the unbalance being compensated separately. The controller intrinsically limits the current during transients, achieving protection of the semiconductor devices and avoiding coil saturation. The proposed control and balance methods are validated experimentally on a two-leg interleaved converter.