This is an extensive literature review on Voltage gain optimization techniques in bidirectional DC–DC converters for electric vehicle charging. In recent years, the increasing demand for electric vehicles (EVs) has emphasized the need for efficient and reliable power converters and controllers. Traditional bidirectional DC–DC converters often face challenges in achieving wide voltage gain, which is essential for EV charging systems to manage varying battery levels. The closed-loop operation (with the help of PI/Fuzzy-PI) differs from current techniques that increase voltage gain while preserving system efficiency but decrease power losses. These closed-loop operation provides a better performance during both charging and discharging stages, which enables for faster, more reliable charging with improved management of energy, is the primary advantage compared to conventional techniques. This analysis advices that the development of sophisticated converters incorporated with highly efficient closed-loop controller offers better voltage regulation, smaller steady-state error and better stability under varying operating conditions. With this feature, we can find a more reliable, responsive, and more eco-friendly electric vehicles.