Voltage Control in Push-Pull DC-DC Converter using State Space Averaging PID with Soft-Start for Electric Vehicle Auxiliary System

Designing electric vehicle, especially bus, a specific component is needed to supply the power for 24V auxiliary system from 400V battery source. Isolated DC-DC converter is a solution to convert voltage level from 400V to 24V with Switch Mode Power Supply (SMPS) method. The proposed design is a push-pull topology DC-DC converter to drive 1kW power transmission. As the proposed model is an approach to real electrical components, so the design is not an ideal model and approaching the actual condition. In this paper, state-space averaging is used to model the DC-DC converter and root locus method is used to design the PID Controller to achieve expected output voltage result. A soft-start mechanism is implemented in PID to achieve less current and voltage peak in primary side.