Wide Duty Ratio DC DC Converter for Ultracapacitor Based EV Drive

Ultracapacitor-based electric vehicle storage systems are widely accepted owing to their attributes such as fast charging, high power density, and long charge-discharge efficiency over etc. Despite these advantages, ultracapacitors have severe reduction in terminal voltage while it discharges. To overcome this issue, an ultracapacitor-based storage requires a wide-duty high-gain DC DC boost converter as an interface between the UC bank and electric vehicle drive. In this study, a coupled inductor based novel high gain DC DC boost converter is proposed. The novel converter have the capability of boosting the terminal voltage with a wide variation in duty ratio (25-75%). A 100 W prototype of this converter is tested system and the results found satisfactory.