Lower module of power electronic device

A lower module included in a power electronic device divided into an upper module and a lower module by an intermediate plate, the lower module comprising:

• a blower fan installed on a first side surface of the lower module to introduce air into an inner space of the lower module from outside of the lower module;
• a plurality of capacitors installed in a suspended form on the intermediate plate and spaced apart from the blower fan by a predetermined distance;
• a heat sink having a plurality of heat dissipation fins through which heat generated from a heating component disposed on the upper module is conducted, and disposed adjacent to the plurality of capacitors to cool the plurality of heat dissipation fins by air moved from the plurality of capacitors;
• a Direct Current (DC) reactor disposed between a first side of the lower module and a second side opposite to the first side and cooled by the air moved from the plurality of heat dissipation fins;
• and
• a discharge plate disposed on a second side surface of the lower module and having a vent hole so as to discharge the air moved from the DC reactor to outside,
• wherein the air passes through the blower fan, the plurality of capacitors, the heat sink, the DC reactor, and the discharge plate, in order, to be then discharged to the outside after heat exchange,
• wherein at least four capacitors of the plurality of capacitors are spaced apart from each other along a width direction of the lower module, so that at least three air movement passages are formed between the at least four capacitors.

A lower module included in a power electronic device divided into an upper module and a lower module by an intermediate plate, the lower module comprising:

• a blower fan installed on a first side surface of the lower module to introduce air into an inner space of the lower module from outside of the lower module;
• a plurality of capacitors installed in a suspended form on the intermediate plate and spaced apart from the blower fan by a predetermined distance;
• a heat sink having a plurality of heat dissipation fins through which heat generated from a heating component disposed on the upper module is conducted, and disposed adjacent to the plurality of capacitors to cool the plurality of heat dissipation fins by air moved from the plurality of capacitors;
• a Direct Current (DC) reactor disposed between a first side of the lower module and a second side opposite to the first side and cooled by the air moved from the plurality of heat dissipation fins;
• and
• a discharge plate disposed on a second side surface of the lower module and having a vent hole so as to discharge the air moved from the DC reactor to outside,
• wherein the air passes through the blower fan, the plurality of capacitors, the heat sink, the DC reactor, and the discharge plate, in order, to be then discharged to the outside after heat exchange,
• wherein the DC reactor comprises:
• a main body fixed to a base surface of the lower module;
• a connection line extending from the main body and connected to a side of the upper module;
• and
• a connection line housing having a first end connected to the main body and a second end fixed to the intermediate plate or the upper module, and having a space through which the connection line passes inside to protect the connection line.