| 摘要 |
<p>PURPOSE:To suppress the variation in an output voltage by switching a current switching by a pulse width modulation signal corresponding to a value superposed with the output voltage of a generator and a field applying voltage. CONSTITUTION:A pulse width modulation signal generator 23 controls a switching unit 24 by a pulse width modulation signal S to turn ON and OFF a current flowed to the primary winding of a transformer 25 by a basic frequency in a range of 10kHz to 200kHz. Thus, an alternating voltage is induced in the secondary winding of a transformer 25, and the voltage is supplied through a rectifier 27, a smoothing condenser 28 to a field winding 2. At this time, a pulse width modulation signal generator 23 generates a pulse width modulation signal S which becomes small in the pulse width proportional to the value superposed with an output voltage information Va corresponding to the output voltage output from a main generating winding 1 and a voltage component Vb corresponding to the output voltage of a rectifier 27.</p> |
