| 摘要 |
PURPOSE:To stabilize the start of a high frequency inverter by providing a capacitor switching member of a starting capacitor divided in response to a load switching member, thereby enabling to adjust the capacity of the starting capacitor in response to the load amount. CONSTITUTION:A capacitor 5X is charged through a diode before starting. A starting thyristor 6 is fired at the starting time to discharge the charged charge to a load 4X, thereby generating a commutation voltage, and a power inverter thyristor 3 is thus commutated for starting. Thereafter, the commutation of the thyristor 3 is continued with the load voltage generated by the energy from the side of a power converter thyristor 1, thereby continuing the inverter operation. When the load amount is varied, i.e., when a load switching contactor 10Y is thrown, a capacitor switching contactor 11Y corresponding thereto is cooperatively thrown, the capacity of the starting capacitor is adjusted in response to the load amount. |
