Constant Current Boost Converter for Auxiliary Battery Charging in Electric Vehicles
Keywords:
4S1P, Constant current–constant voltage control, Continuous conduction mode, DC–DC boost converter, Electric vehicle, Lithium-ion battery charging, PI controllerAbstract
As the world is shifting to EV transportation, the requirement for charging methods that are fast, efficient, and do not wear out batteries too quickly is also rising. Different approaches exist, and each has its own set of trade-offs. Some prioritize speed, others focus on battery health, and a few try to balance both. The proposed system dives into the design and simulation of a lithium-ion battery charging system for electric vehicles. This paper presents the design and simulation of a DC-DC boost converter stepping up the voltage from 12V to 16.8V for a 4.5Ah battery pack. Boost converter parameters, including inductor, capacitor, and switching device, are designed for continuous conduction mode operation at a specified switching frequency. A proportional-integral (PI) controller employing negative feedback control regulates the constant-current-constant-voltage charging by sensing battery current and computing the duty cycle. Simulation is carried out using MATLAB Simulink to observe the ripple voltage spikes across the output voltage by changing the switching frequency. Results show us that 35 KHz provided the least ripple voltage compared to other frequencies on which the system was tested.
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