| 摘要 |
PURPOSE:To reduce a current ripple near the crest value of an input current even when an output becomes large in a resonance-type inverter apparatus. CONSTITUTION:An LC resonant circuit 25 converts a DC voltage vs into a DC link voltage vc which becomes periodically zero due to a resonance phenomenon, and it gives the link voltage to an inverter main circuit 34. A three-phase/ twO-phase converter 36 detects three-phase output voltages vu, vv, vw of the inverter main circuit 34, and it converts the three-phase detection voltages into two-phase detection voltages vx, vy. In addition, an output control means 54 operates differences DELTAvx, DELTAvy between two-phase output voltages vx', vy', from a voltage command generator 53 and the two-phase detection voltages vx, vy it integrates the differences, it obtains error voltages ex, ey, it decides a switching pattern according to the direction of a voltage error vector which uses the error voltages ex, ey as components, and it controls transistors 28 to 33 for the inverter main circuit 34 so as to be turned on and off in such a way that the switching pattern is obtained when the DC link voltage vc is zero. |
