A PFC and LLC resonance-based smart half bridge sine wave voltage conversion circuit, comprising: an input unit (10), a filtering unit (20), and a PFC boost unit (30); an LLC isolation converter unit (40), comprising a first switch tube (Q6), a second switch tube (Q7), a transformer (T1), a first diode (D5), a second diode (D6), and a first filtering inductor (L3); an inverted phase inverting unit (60), comprising a fourth switch tube (Q2), a fifth switch tube (Q4), a third electrolytic capacitor (C3), a fourth electrolytic capacitor (C5), and a second filtering inductor (L4), wherein a source of the fourth switch tube (Q2) is connected to a drain of the fifth switch tube (Q4), and the positive pole of the third electrolytic capacitor (C3) is connected to a drain of the fourth switch tube (Q2), while the negative pole of the third electrolytic capacitor (C3) is further connected to the positive pole of the fourth electrolytic capacitor (C5), and the source of the fourth switch tube (Q2) is connected to a front end of the second filtering inductor (L4). Said voltage conversion circuit may improve PF values and the quality of outputted voltage.
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