According to the present invention, there is provided a voltage generating circuit comprising a first voltage generating unit generating a low voltage, a second voltage generating unit generating a high voltage higher than the low voltage, four switches connected in series and at least one inductor, And a LC resonance element. The first resonance unit applies a resonance current to the first switch or the second switch connected in series among the four switches, Level bidirectional DC-DC converter including a resonance element, and a second resonance part configured to apply a resonance current to a third switch connected in series among the four switches or to a switch that is turned on by series resonance when the fourth switch conducts .
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