| 摘要 |
PURPOSE:To fix the change of an output voltage to the change of a set signal, which is proportional to a mechanical set value, by approximating the linear part of a sawtooth-shaped signal as the ignition phase determination reference of a semiconductor control element by a cosine waveform. CONSTITUTION:There are a method due to a computer and a method to obtain approximately shaped sawteeth waves, etc., for a reference voltage Vn, which is outputted from a shaped sawtooth signal generator 16, to produce the cosine wave-shaped sawtooth wave. By using the computer, voltage data hourly dividing the cosine waveform are outputted by digital signals while being synchronized to a power supply synchronizing signal to detect the zero volt of a power supply voltage, and these data are converted to analog amounts by a D/A converter 22 and shaped to obtain the sawtooth wave. In such a method, the much exacter waveform can be obtained by sufficiently enlarging the number of times for hourly dividing the cosine waveform. Even when the linear part of the sawteeth wave signal is approximated by the approximately shaped sawtooth wave, an effect can be enough expected by comparing it with the sawtooth waveform to be linearly changed. |
