| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter control circuit having high efficiency that can be obtained by a small-size inexpensive construction. <P>SOLUTION: An inverter control circuit has a full-wave rectifier circuit 23 for converting AC power from an AC power source 21 to DC power, an inverter 25 that is connected to the full-wave rectifier circuit 23, has plural switching elements and converts DC power to AC power, a motor 26 driven by the inverter 25, a small-capacity reactor 22 connected to the AC input side of the full-wave rectifier circuit 23, and a small-capacity smoothing capacitor 24 connected between the full-wave rectifier circuit 23 and the inverter 25. The motor 26 is driven while a rectangular wave drive system and a sine wave drive system are switched to each other so as to avoid the resonance between the resonance frequency of the small-capacity reactor 22 and the small-capacity smoothing capacitor 24 and the output frequency of the inverter, whereby variation of the DC voltage under high-speed rotation can be suppressed and high-speed rotation control can be performed without any large-capacity capacitor, so that the circuit can be miniaturized. <P>COPYRIGHT: (C)2013,JPO&INPIT |
