| 摘要 |
A snubber circuit, in which a semiconductor bridge circuit is connected in parallel between the positive and negative electrodes of a DC power supply, includes a current-variation suppressor connected between the semiconductor bridge circuit and the DC power supply and restricts an abrupt current variation when each semiconductor switch in the semiconductor bridge circuit is turned on; a voltage-variation suppressor which is parallel to the semiconductor switches and restricts an abrupt voltage variation when the semiconductor switches are turned off; a retrieving circuit to transfer energy stored in the current-variation suppressor when the semiconductor switches are turned on to the voltage-variation suppressor for a predetermined time when the semiconductor switches are turned off; and a discharging circuit to discharge energy stored in the voltage-variation suppressor when the semiconductor switches are turned off to an AC side of the semiconductor bridge circuit when the semiconductor switches are turned on. |
