Abstract

This paper introduces a robust, hardware-efficient auto-tuned digital controller applicable to various hard switching dc-dc converters, including indirect energy transfesr topologies. Unlike existing fast transient controllers for indirect energy transfer converters, the controller achieves fast transient response and practically minimum deviation of the output voltage without depending on information about converter parameters, i.e. inductor and output capacitor values. This is achieved by utilizing an auto-tuned non-linear controller that, based on the load-step information during a transient, finds the switching sequence for the converter to ramp up/down the inductor current to its new steady state average value in a single on/off switching action. Experimental results obtained from a 1.5 V to 3.3 V, 1A, 500 kHz boost prototype verify response with practically minimum output voltage deviation and demonstrate a more than 50% reduction of both output voltage deviation and recovery time compared to a voltage mode, fast PID-based controller.

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