| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress a rise in terminal voltage due to LC resonance caused by a wiring cable or the like, when power is supplied to a load from a power converting device whose output voltage changes in steps. <P>SOLUTION: Since output terminals of two PWM inverters 2A, 2B are connected in parallel through an interphase reactor 3, and a gate control signal delayed by ΔT to a gate control signal from a PWM command generator 4 can be obtained by using a delay device 5, composite output voltages of two inverters have waveforms changing in a plurality of steps. As a result, the range of a voltage rise per step by LC resonance is suppressed to a half. For the time ΔT, the phase difference between resonance in a first step voltage and resonance in a second step voltage is shifted at 180° from each other, and also its mutual cancellation can suppress the range of the voltage rise. <P>COPYRIGHT: (C)2003,JPO |
