| 摘要 |
PURPOSE:To effectively utilize the output votage of a DC power source by erasing one stopping switching pulse when the current of a main circuit continues and increasing the other driving switching pulse width. CONSTITUTION:The presence or absence of an interruption of a current of a main circuit is discriminated by an interruption discriminator 44, and the polarity of the current of the main circuit is discriminated with a command from a current instruction circuit 40 by a polarity discriminator 42. The interruption and polarity discrimination signals from both the discriminators are inputted to a pulse width correcting circuit 38, one stopping switching pulse is erased when the current of the main circuit continues, and the width of the other driving switching pulse is increased. |
