Prototype of a novel steady-state load identification technique for digitally controlled DC-DC power supplies

This demo will show a novel method of Selftuning technique suitable for digitally controlled Switching Mode Power Supplies (SMPS). Perturbations can be added in order to stimulate loop reaction, which mainly contains load information. Variations on the Power Supply output filter, can be monitored and regulation gains can be consequently set for reaching a well compensated closed loop condition. The closed-loop system can be periodically perturbed by injecting a further amount of quantization noise provided through a low-resolution Delta-Sigma (ΔΣ) modulator. Digital control, PSD computation and Extraction-regulation blocks are synthesized on Virtex6 FPGA, while analog blocks (Buck Converter and ADC) are part of a Test Chip (TC) which can be configured via SPI in order to enable an external control loop configuration.