| 摘要 |
PURPOSE:To obtain a power converter which realizes the compact configuration, low cost and high efficiency. CONSTITUTION:A snubber circuit comprising a first capacitor 4, which is connected to a self-arc-extinguishing type semiconductor element 1a in parallel, and a third diode 3 is provided. A second capacitor 7 and a fourth diode 6, which are connected between the connecting point of the snubber circuit and an output terminal A are provided. A power regenerating circuit 8, which regenerates the energy accumulated in the second capacitor into a DC power supply 9 by the switching operations of self-extinguishing-type semiconductor elements 1a and 1b, is provided. Thus, the recovering capacitor 7 is controlled to the voltage lower than a DC power supply voltage E, and the low voltage is provided. The charging polarity of the capacitor is always made to be the single polarity. Thus, the constituent elements of the snubber circuit are decreased without imparing the function for suppressing the steep rising of the voltage and the current applied on the self-distinguishing type semiconductor element to the intended values. |
