| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the voltage utilization rate of a single/three phase direct conversion device. <P>SOLUTION: A diode rectifier 3 performs the full-wave rectification with respect to a single phase voltage Vin, and outputs a rectified voltage Vdc between direct power supply lines LL, LH. An inverter 5 receives the rectified voltage Vdc, and supplies three phase AC currents Iu, Iv, Iw to an inductive load 6. A charge/discharge circuit 4 is connected between the direct power supply lines LL, LH. The charge/discharge circuit 4 has a buffer circuit 4a and a step-up circuit 4b. The buffer circuit 4a includes connection in series between a capacitor C4 and a switch Sc. The step-up circuit 4b, for example, is constituted of a step-up chopper and includes a switch Sl, a reactor L4, and a diode D40. <P>COPYRIGHT: (C)2011,JPO&INPIT |
