Llc resonant converter

PURPOSE: A logical link control resonant converter is provided to obtain stable power in a range of wide input voltage by controlling operation of one resonant tank circuit of two resonant tank circuits. CONSTITUTION: A logical link control resonant converter comprises a first resonant tank circuit(110), a second resonant tank circuit(120), and an output rectifying part(130). The logical link control resonant converter comprises a first main switching element and a second main switching element performing switching operation. The first resonant tank circuit comprises a primary side coil of a first transformer, and a sub switching element. The second resonant tank circuit comprises a secondary side coil of a second transformer. The first resonant tank circuit comprises a first resonating capacitor, a first leakage inductance, and a first magnetizing inductance. The second resonant tank circuit comprises a second resonating capacitor, a second leakage inductance, and a second magnetizing inductance. The output rectifying part comprises a secondary side coil of the first transformer and the secondary side coil of the second transformer.