LLC LLC Resonant Power Supply

摘要

An embodiment of the present invention relates to an LLC resonant power supply device. A technical problem to be solved is to provide the LLC resonant power supply device with excellent power conversion efficiency characteristics due to a simple circuit configuration and control method. To this end, according to the present invention, the LLC resonant power supply device comprises: a first power converter converting first AC power into first DC power and outputting the first DC power; a second power converter receiving the first DC power from the first power converter to convert the first DC power into second AC power, and converting the second AC power into second DC power to output the second DC power; and a charging unit connected in parallel between the first and second power converters. The second power converter includes: a switching unit connected in parallel with the first power converter and the charging unit to output power at a predetermined duty; an LLC resonator resonating power output from the switching unit; a transformer converting the power resonating from the LLC resonator into the second AC power, and outputting the second AC power; and a rectifier rectifying the second AC power output from the transformer to the second DC power, and outputting the second DC power.