Conference Proceeding

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

Autom. Control Lab., ETH Zurich, Zurich
PESC Record - IEEE Annual Power Electronics Specialists Conference 07/2008; DOI:10.1109/PESC.2008.4592071 pp.1069 - 1074 In proceeding of: Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
Source: IEEE Xplore

ABSTRACT 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.

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Keywords

alternative solution
 
capacitor voltage ripple
 
controller intrinsically limits
 
current transducer
 
feedback loop
 
interleaved DC-DC converters
 
legs
 
model predictive control scheme
 
present paper investigates
 
proposed control
 
semiconductor devices
 
single leg converter
 
two-leg interleaved converter
 
voltage control
 

S. Mariethoz