| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high performance multilevel converter which has many output voltage levels and a low high-frequency voltage with the number of devices fewer than a conventional one, thereby preventing the device from being damaged by an excessive voltage and simplifying the control of the multilevel converter by avoiding loss concentrated on a specified device without using a specified means. <P>SOLUTION: First to third capacitors C1 to C3 are sequentially connected in series between the positive electrode and the negative electrode of a DC power source, a controllable device and a diode are connected inversely parallel with each other to constitute a reverse conduction switch, and first to fourth reverse conduction switches Q1 to Q4 are sequentially connected in series between the positive electrode and the negative electrode. The junction point of the Q2, Q3 is made to be an AC input/output terminal AC, a fifth reverse conduction switch Q5 is connected between the junction point of the Q1, Q2 and the junction point of the capacitors C1, C2, and a sixth reverse conduction switch Q6 is connected between the junction point of the Q3, Q4 and the junction point of the capacitors C2, C3. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
