Modeling and Control of a Phase-Shifted Full-Bridge Converter for a LiFePO4 Battery Charger

Abstract

A proper charge in an electric vehicle (EV) battery allows it to have a longer useful life and lower maintenance costs. For this purpose, the voltage and current supplied to the battery must be precisely regulated. In this article, the model of a phase-shifted full-bridge (PSFB) converter is obtained. Moreover, a dual control loop was designed to regulate the state of charge of a lithium ferrofosfate (LiFePO4) battery. The autoregressive exogenous (ARX) model is used to model the system. Once the plant model is obtained, it is controlled using a classical controller. A couple of cases are evaluated where the control parameters are modified, and the best approach is selected. From the obtained model, the controller is designed for the proposed cases. The theoretical controller response is compared with the experimental response. The results show a 94% accuracy of the model. In the same way, the result obtained from the controller is accurate in a 96% by comparing it with a simulation. Both the modeling and the control obtained experimentally resemble the results obtained theoretically. The controller manages to respond as expected in all proposed cases.

DESIGN AND APPLICATION OF AC/DC SWITCHING POWER SUPPLY WITH HALF BRIDGE DC/DC CONVERTER TOPOLOGY FOR BATTERY SYSTEMS of ELECTRICAL VEHICLE

“…[25] presents half bridge DC-DC converter focusing on power factor correction for battery charging of the electrical vehicle but the protection of the battery is not covered as it presented in the paper. Although, full-bridge and DAB based electrical vehicle battery charger are presented in [26], [27] for higher power, number of switch and voltage stress on the power switches are higher than presented study. [28] presents electrical vehicle charger based on LLC converter, but it does not present battery package structure as it is given presented study and have higher number of power switches increasing cost.…”

Switched-Resistor Passive Balancing of Li-Ion Battery Pack and Estimation of Power Limits for Battery Management System

“…If the balancing resistance is high, the balancing is slow, but the balancing power is less. This switched-resistor-based balancing is inexpensive, compact, and easy to regulate and fabricate [72], in comparison to other techniques. Table 3 shows the reported results by the authors in [73], for cell balancing for three cells under study for the equalization time and energy loss.…”

Soft-Switching Full-Bridge Topology with AC Distribution Solution in Power Converters’ Auxiliary Power Supplies

“…The soft-switching HF converter operation is experimentally validated in an actual 25 kW, [31] (800 V of DC bus) SiC MOSFETs-based DC-DC full-bridge converter, devoted to the first stage of an isolated charger circuit [32]. The simplified schematic of the power converter is reported in Figure 17a.…”