| 摘要 |
PURPOSE: To generate output approximating sine of an AC the cycle of which can be fixed or changed by connecting a DC power source of an output step multiple voltage to a bridge-type output circuit of equal-step operation control. CONSTITUTION: A current passes through a load in a positive direction, with the operating control of a central control unit CCU received, when two sets of bridge-type articulated switches SWF101, 102 are on, and the current passes through the load in the opposite direction, when another two sets of bridge-type articulated switches SWF101, 102 are on to constitute an AC current transforming function of one cycle. The central control unit controls the operation of a bridge-type circuit, produces an output during a polarity exchange period, and control the operation of a multiple-voltage supply unit with equal steps at the time of output of each polarity, so that it is possible to attain an AC output which is approximate to an AC sine from a multiple step multiple voltage DC. |
