| 摘要 |
PURPOSE:To return the vibration phase to the normal state quickly by changing the drive pulse width and the phase at the normal time in linkage with a switch circuit employing a CMOS transistor when the amplitude and the phase of a converter are above or below the preset value. CONSTITUTION:When the vibration phase of a converter advances with respect to a force drive signal 58 due to disturbance, the waveform of the induced voltage is as shown by the waveform 51b. A phase advance difference detection circuit 22 whose input is a phase advance reference signal phiS1 and not-output -A of the detection circuit output A operates to produce pulses 69 from the output B to set the output D of phase advance difference memory circuits 23 and 24 at ''1''. Phase advance driving pulses phiS2 pass a switching circuit 25 and pulses -phiZ develop at the output G to be applied to the input J of an AND circuir 40. Since the waveform 58 was previously applied to the input K, the output L of a pulse selection circuit is as shown by the waveform 71. In short, this generates an output voltage equivalent to two times as large as the pulse width of pulses extended by 1/16 second in the advance direction from those at the normal time which causes a drive current 72 to flow through a drive coil 43. Thus, the vibration phase of the converter is returned quickly. |
