| 摘要 |
<p>A synchronous rectifier circuit of a three-phase step down resonant type for improving a power factor according to the present invention, connected to a resonant circuit unit in which three-phase alternating current power sources (Va, Vb, Vc) include each of reactors (La, Lb, Lc) and capacitors (Ca,Cb,Cc), wherein the resonant circuit unit comprises a circuit connected to a neutral point of top diodes (D1, D2, D3) and bottom diodes (D4, D5, D6) of a three-phase diode bridge rectifier unit, is configured in that: the capacitors (Ca,Cb,Cc) are serially connected to the three-phase alternating current power sources (Va, Vb, Vc) for each phase; first and second switching elements (Q1, Q2) are serially connected to a cathode unit of the bottom diodes (D4, D5, D6) of the three-phase diode bridge rectifier unit; a serial connection of first and second diodes (D7, D8) and an output end capacitor (Co) are serially connected to the three-phase diode bridge rectifier unit in parallel; the neutral point (N1) of the first and second diodes (D7, D8) and terminal parts of the capacitors (Ca,Cb,Cc) are connected through a first capacitor (C1); and the neutral point (N2) of the capacitors (Ca,Cb,Cc) and the first capacitor (C1), and the neutral point (N3) of the first and second switching elements (Q1, Q2) are connected through a second capacitor (C2).</p> |
