Experimental Validation of a Non-Isolated DC-DC Bidirectional SEPIC

Power converters with bidirectional operation have turned into an important area of research due to their applications, for example, in electric vehicles. The standard SEPIC that is non-isolated and bidirectional is obtained from the conventional SEPIC, replacing the power diode with a controllable switch. The resulting converter has a simple structure, only two controlled switches, a reduced number of passive elements, and the ability to increase or reduce the voltage level in any direction of power flow. This paper presents the averaged model and a frequency response analysis that can allow the design of a controller. An experimental validation in open loop and continuous conduction mode is also presented, which considers, reverse and direct power flows, and two different operating powers.