Full-order averaging modelling of zero-voltage-switching phase-shift bidirectional DC–DC converters

Abstract

Full-order small-signal modelling and dynamic analysis of zero-voltage-switching (ZVS) phase-shift bidirectional DC-DC converters is studied. A general modelling method is proposed to develop the discretetime average model. This full-order model takes into account the leakage inductance current and the resonant transition intervals in order to realise ZVS. Both the leakage inductance current and the resonant transition intervals are the key to accurately predict the dynamic behaviour of the converter. A control-to-output-voltage transfer function is derived for the dual active bridge DC-DC converter, which is taken as an example to illustrate the modelling procedure. Experimental results confirm that the new model correctly predicts the small-signal frequency response up to one-third of the switching frequency and is more accurate than the previously presented models.

Stability analysis of digitally controlled dual active bridge converters

“…Obviously, the steadystate solution corresponds to constant phase shift angle U and state vector X ¼ I L V C ½ T . Denote the subintervals t 1 -t 4 and exponential matrices in (7) using capitals to represent the steady-state values as in (19).…”

“…Thus, several discrete-time models for DAB converters have been established. In [19], a discrete-time averaged model is obtained. This model averages the value of the output voltage over half switching period and suitable for half period control.…”

Analysis of MOSFET Failure Modes in Bi-directional Phase-Shift Full-Bridge Converters

“…As the development of vehicle to grid systems and renewable energy sources or battery energy storage systems has been actively progressing, the bi-directional converter has continued to receive attention as the effective power transfer unit from the battery to the energy source [1][2][3][4].…”

Modeling and Current Programmed Control of a Bidirectional Full Bridge DC-DC Converter

“…Bidirectional full bridge (FB) converters have been studied in many papers like [11][12][13]. A general modeling method that develops the discrete time average model is proposed in [12].…”

“…A general modeling method that develops the discrete time average model is proposed in [12]. The operation period is divided to 3 intervals, the equivalent circuit and the differential equations for each interval are written in matrix form.…”