Digital control methods for current sharing of interleaved synchronous buck converter

The quasi square wave operation of the synchronous buck with interleaved parallel outputs has been successfully used in low voltage high current DC-supply for microprocessors. This topology results in fast transient response and high power density. In this paper, two digital control strategies for current sharing control are tested by simulation in Simulink, and tested in the laboratory. The digital current control methods are tested using a 150 MHz Texas Instrument TMS320F2812 DSP and studied with regard to the current reference step response. The results from the simulations and the experiments show that it is possible to increase control performance by using a predictive controller but that this would require extra cost and design effort to implement a low noise and high bandwidth measurement hardware on the output voltage