  In the paper, a nonlinear inversion technique for the steady-state model of
the active dual-bridge series resonant converter is presented. The obtained
control strategy allows cycle averaged output current regulation and performs
waveform alignment for the controllable achievement of ZVS and synchronous
rectification. The control is valid both for voltage buck and boost operating
modes, as well as for low-power operation at a fixed frequency. Robustness of
the control is studied by simulations with external linear control loops.
