Bidirectional DC-DC converter design and implementation for lithium-ion battery application

Bidirectional DC-DC converter is potentially used for an energy charging or discharging device; however, the converter displays highly non-linear characteristics since its internal system parameter varies depending on the operation mode and the disturbance engagement. To cope with the non-linearity, a bidirectional DC-DC converter based on time delay control (TDC) is designed and validated for lithium-ion battery application. Control-oriented lithium-ion battery-fed bidirectional DC-DC converter model is constructed with MATLAB/Simulink. Converter PWM duty ratio control technique based on TDC is subsequently designed and assembled for lithium-ion battery operation regulation. Moreover, to validate the efficacy of the present approach, proportional-integral (PI) control is implemented and its results are compared with TDC results. The experimental implementation is performed with National Instrument (NI) Lab VIEW, whose results show excellent bidirectional converter performance.