LLC resonance conversion circuit

An LLC resonance conversion circuit, comprising:

• a primary side network, including four switch elements and an input capacitor;
• a transformer, including a coil and an excitation inductor;
• a primary side resonance circuit, including a resonance capacitor, a resonance inductor, an auxiliary inductor, a first switch and a second switch, wherein the resonance capacitor and the resonance inductor are connected in series between the coil and the primary side network, two terminals of the excitation inductor are connected to the coil, the first switch, the auxiliary inductor and the second switch are connected in series between the resonance inductor and the primary side network, and the second switch is used to control a connection state of a path between the auxiliary inductor and the excitation inductor;
• and
• a secondary side network, including four switch elements and an output capacitor, wherein the secondary side network is connected to the coil.

An LLC resonance conversion circuit, comprising:

• a primary side network, including six switch elements and an input capacitor;
• a transformer, including three coils and three excitation inductors;
• a primary side resonance circuit, including three resonance capacitors, three resonance inductors and three auxiliary inductors, wherein each of the three resonance capacitors and each of the three resonance inductors corresponding thereto are connected in series between each of the three coils corresponding thereto and the primary side network, and two terminals of each of the three excitation inductors are connected to each of the three coils corresponding thereto, and each of the three auxiliary inductors is connected to each of the three resonance inductor inductors corresponding thereto;
• and
• a secondary side network, including six switch elements and an output capacitor, wherein the secondary side network is connected to the three coils;
• wherein the three auxiliary inductors are connected in a ring.