| 摘要 |
PURPOSE:To eliminate a converting shock by switching the output waveform of an inverter when a continuity is held to the waveform to be converted when converting the output waveform of the inverter. CONSTITUTION:A phase theta for accessing respective PWM patterns stored in a memory 6 is obtained by integrating the phase theta by an integrator 1. A converter 2 receives phases theta, phi and a switching command CHANG for the PWM waveform to search a memory 4 for storing the coincidence timing of the phases theta and phi, and to output the actual conversion command 2a to a converter 3. The output of the converter 3 is supplied to one input of a PWM waveform shaper 5, thereby reading out the PWM waveform converted from the memory 6 to convert it to a gate output via a limiter 7, thereby inputting it to the inverter. |
