Current-type converter with overvoltage protection.

摘要

In a current-type converter system, in which a DC current is fed to a load (8) through a pulsating current suppressing DC reactor (DCL) from a current-type converter constituted by self-extinction element (11...16) connected in a bridge circuit, a converter protection apparatus is arranged such that when the terminal voltage of the DC reactor (DCL) becomes an overvoltage, the self-extinction elements (11...16) are turned on so as to form a closed circuit including the DC reactor (DCL), the load (8), and the converter. The overvoltage can thus be suppressed and continuous operation of the converter can be carried out.