Abstract: An LLC converter includes a plurality of resonant circuits that each include a plurality of capacitors connected to a DC input voltage, a switching circuit including a plurality of switches connected to the DC input voltage, a plurality of transformers each including a plurality of primary windings and a plurality of secondary windings, and a plurality of synchronous rectifiers each connected to one of the plurality of secondary windings. The plurality of primary windings of each of the plurality of transformers includes a first primary winding and a second primary winding. Series-connected first primary windings are connected to a first resonant circuit of the plurality of resonant circuits, and series-connected second primary windings are directly connected to a second resonant circuit of the plurality of resonant circuits. Currents from each of the plurality of secondary windings are equal or substantially equal.

Abstract: An LLC converter includes a plurality of resonant circuits that each include a plurality of capacitors connected to a DC input voltage, a switching circuit including a plurality of switches connected to the DC input voltage, a plurality of transformers each including a plurality of primary windings and a plurality of secondary windings, and a plurality of synchronous rectifiers each connected to one of the plurality of secondary windings. The plurality of primary windings of each of the plurality of transformers includes a first primary winding and a second primary winding. Series-connected first primary windings are connected to a first resonant circuit of the plurality of resonant circuits, and series-connected second primary windings are directly connected to a second resonant circuit of the plurality of resonant circuits. Currents from each of the plurality of secondary windings are equal or substantially equal.

Abstract: An LLC converter includes a resonant circuit connected to a DC input voltage, a switching circuit connected to the DC input voltage, transformers each including primary windings and secondary windings, and synchronous rectifiers each connected to one secondary winding and to ground. The primary windings of the transformers include a first primary winding and a second primary winding. The first primary windings of the transformers are connected in series, and the second primary windings of each of the plurality of transformers are connected in series. The series-connected first primary windings and the series-connected second primary windings are directly connected in parallel with the resonant circuit. A first current from a first switch flows into the series-connected first primary windings, and a second current from a second switch flows into the series-connected second primary windings. Currents from each of the secondary windings are equal or substantially equal.

Abstract: An LLC converter includes a resonant circuit connected to a DC input voltage, a switching circuit connected to the DC input voltage, transformers each including primary windings and secondary windings, and synchronous rectifiers each connected to one secondary winding and to ground. The primary windings of the transformers include a first primary winding and a second primary winding. The first primary windings of the transformers are connected in series, and the second primary windings of each of the plurality of transformers are connected in series. The series-connected first primary windings and the series-connected second primary windings are directly connected in parallel with the resonant circuit. A first current from a first switch flows into the series-connected first primary windings, and a second current from a second switch flows into the series-connected second primary windings. Currents from each of the secondary windings are equal or substantially equal.