Abstract: A bidirectional resonant DC/DC converter comprising a full-bridge coupled to an CLLLC resonant tank and a power transformer and rectifier stage, said full-bridge comprising two pairs of power switches S1/S2 and S3/S4, configured such that in a first mode of operation: switches S1 and S4 are driven by the same two pulse pattern with a phase shift ?1, said two pulse pattern comprising a first pulse P1 of width t1 and a second pulse P2 of width t2, P1 and P2 being separated by an off-time t3, and switches S2 and S3 are driven by the same single pulse pattern comprising pulse P4 of width t4 with a phase shift ?2. This converter can be used in battery chargers, in particular, for electrical vehicles.

Abstract: A method for controlling active and reactive powers in grid-tied converters having a grid side and a battery side, in which said grid side supplies an alternative current to said converter whereas the battery side receives a direct current from said converter, said method comprising direct active and reactive power control in ABC frame where no transformation is used, and wherein active power is controlled by controlling the battery charging and discharging currents, and reactive power is controlled by controlling the phase shift between power factor correction current and voltage.