A new digital peak current mode DC-DC converter using FPGA delay circuit and simple A-D converter

This paper presents a new digital peak current mode dc-dc converter using a FPGA delay circuit and a simple A-D converter. The peak current detection circuit is only composed of RC integrator and field programmable gate array (FPGA) delay circuit. The sampling point of detected current is changed by the feedback value of output voltage. The RC integrator is performed as the A-D converter for the current. The proposed method can detect the peak point of current in real time and shows a superior transient response. As a result, the convergence time and undershoot of output voltage are suppressed to one third and one fourth, respectively.