Digital Control Techniques for optimizing DC-DC Converters in Electric Vehicles

This paper introduces a novel digital controlled DC-DC converter tailored specifically for electric vehicle (EV) applications. The primary objective of this system is to efficiently convert the high battery voltage characteristic of EVs into a lower voltage suitable for powering the vehicle's electronic subsystems. The core of the proposed converter resides in a meticulously designed power stage, which employs a phase-shifted Zero Voltage Switching (ZVS) full-bridge DC-DC architecture. The system employs a singular one-chip PIC microcomputer to handle both feedback control of output power and the actuation of all switching elements within the converter. This streamlined approach establishes a highly efficient digital control block specifically tailored for this DC-DC converter architecture. To validate the efficacy and performance of the proposed design, a prototype converter with a power rating of 3.0 kW is constructed and subjected to comprehensive testing.