TRANSFORMER TYPE CONVERTER

摘要

A transformer type converter which can make a regeneration of a power supply without using any transformer. A smoothing capacitor C is connected to the positive and negative output terminals of thyristor bridges (10R1, 10R2 - 10T1, 10T2) through diodes (D1, D2) which are connected in the forward direction. The cathodes and anodes of the diodes (D1, D2) are connected through switching elements (T1, T2) respectively. In the powering mode, the switching elements are turned off and the thyristor inverter is phase-angle-controlled to thereby obtain a DC power supply voltage lower than an AC power supply voltage. In the regenerative mode, the switching elements are turned on and an interphase voltage of a power supply lower than the charging voltage of the smoothing capacitor is selected and the thyristor is phase-angle-controlled to thereby feed back regenerative energy to the power supply.