Abstract
This paper introduces a practical single-mode minimum deviation controller for indirect energy transfer converters. It provides theoretically minimum possible output voltage deviation during load transients. The controller has an outer voltage loop, providing half-duty ratio signals, that is triggered by an inner current loop. This controller behaves the same way in steady state and during transients. The effectiveness of the controller is verified experimentally, with a 5 V to 8 V, 16 W, 250 kHz boost converter prototype. The results demonstrate virtually minimal output voltage deviation. In comparison with a PID compensator that has a relatively high bandwidth of one-tenth of the switching frequency, the presented controller has about 2 times smaller deviation allowing for an equivalent output capacitor reduction.
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