A cooling apparatus for a sealed power converter comprising a semiconductor device for power conversion, the cooling apparatus configured for cooling heat generated when the power converter is driven, the cooling apparatus comprising: a compressor configured to generate compressed air; characterized in, that the cooling apparatus further comprises: a sealed case for containing the power converter; a plurality of cooling fins or pipes installed in the sealed case first and second vortex tubes (160, 170) installed in the sealed case and configured to generate cold air based on the compressed air generated from the compressor; a first valve installed between the compressor and the first vortex tube; a second valve installed between the compressor and the second vortex tube; first and second temperature sensors (121, 122) installed in the sealed case of the power converter and configured to measure the internal temperature of the power converter; and a control unit configured to determine whether or not the first and second vortex tubes supply the cold air into the sealed case of the power converter, based on first and second temperatures respectively measured by the first and second temperature sensors, and to transmit a valve open signal or a valve close signal to the first and second valves based on a result of the determination. a compressor configured to generate compressed air; characterized in, that the cooling apparatus further comprises: a sealed case for containing the power converter; a plurality of cooling fins or pipes installed in the sealed case first and second vortex tubes (160, 170) installed in the sealed case and configured to generate cold air based on the compressed air generated from the compressor; a first valve installed between the compressor and the first vortex tube; a second valve installed between the compressor and the second vortex tube; first and second temperature sensors (121, 122) installed in the sealed case of the power converter and configured to measure the internal temperature of the power converter; and a control unit configured to determine whether or not the first and second vortex tubes supply the cold air into the sealed case of the power converter, based on first and second temperatures respectively measured by the first and second temperature sensors, and to transmit a valve open signal or a valve close signal to the first and second valves based on a result of the determination. a sealed case for containing the power converter; a plurality of cooling fins or pipes installed in the sealed case first and second vortex tubes (160, 170) installed in the sealed case and configured to generate cold air based on the compressed air generated from the compressor; a first valve installed between the compressor and the first vortex tube; a second valve installed between the compressor and the second vortex tube; first and second temperature sensors (121, 122) installed in the sealed case of the power converter and configured to measure the internal temperature of the power converter; and a control unit configured to determine whether or not the first and second vortex tubes supply the cold air into the sealed case of the power converter, based on first and second temperatures respectively measured by the first and second temperature sensors, and to transmit a valve open signal or a valve close signal to the first and second valves based on a result of the determination.