SMART HALF-BRIDGE SINE-WAVE VOLTAGE CONVERSION CIRCUIT BASED ON PFC INTERLEAVED FLYBACK

摘要

Provided is a smart half-bridge sine-wave voltage conversion circuit based on PFC interleaved flyback, comprising: an input rectifier filter unit (10); a PFC boost unit (20); an interleaved-flyback isolation transform unit (30), comprising a first switch tube (Q6), a second switch tube (Q7), a first transformer (T1), a second transformer (T2), a first diode (D6), a second diode (D5), a third diode (D7), and a fourth diode (D8); a DC filter unit (40), comprising a first capacitor (C7) and a second capacitor (C8); a cathode of the third diode (D7) is connected to the rear end ground by means of the first capacitor (C7); an anode of the fourth diode (D8) is connected to the rear end ground by means of the second capacitor (C8); an inverting phase-inversion unit (60), comprising a fourth switch tube (Q2), a fifth switch tube (Q4), a third electrolytic capacitor (C3), a fourth electrolytic capacitor (C4), and a filter inductor (L3); the rear end of the filter inductor (L3) and the negative electrode of the third electrolytic capacitor (C3) are used as the output end of the inverting phase-inversion unit (60). It is possible to filter out high-frequency pulses by using the filter inductor, such that a load is able to obtain a high-quality operating-frequency sinusoidal alternating current, while also reducing circuit cost.