Electric Compressor Having Drive Circuit Integrated Thereinto

Abstract

Disclosed is a drive circuit-integrated electric compressor, which is adapted to cool a power semiconductor element in a motor drive circuit with good efficiency without increasing the temperature of sucked refrigerant gas and while suppressing increase in pressure loss in a path for cooling. Specifically disclosed is a drive circuit-integrated electric compressor into which a motor drive circuit having a power semiconductor element is incorporated integrally, characterized in that the electric compressor is configured so that the power semiconductor element in the drive circuit is cooled by refrigerant gas to be discharged.

1 . A drive circuit-integrated electric compressor into which a motor drive circuit having a power semiconductor element is incorporated integrally, wherein said electric compressor is configured so that said power semiconductor element in said drive circuit is cooled by refrigerant gas to be discharged. 
     
     
         2 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said power semiconductor element is a wide band gap semiconductor element. 
     
     
         3 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said power semiconductor element is mounted on a high heat-conduction circuit board and a back surface of said circuit board is configured to be cooled by refrigerant gas to be discharged through a wall of said compressor. 
     
     
         4 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said power semiconductor element is coated with a low heat-conduction resin. 
     
     
         5 . The drive circuit-integrated electric compressor according to  claim 1 , wherein a low heat-conduction heat-shielding member is placed at a position between said power semiconductor element and other electronic parts. 
     
     
         6 . The drive circuit-integrated electric compressor according to  claim 1 , wherein CO 2  is used as refrigerant. 
     
     
         7 . The drive circuit-integrated electric compressor according to  claim 1 , wherein HFC1234yf is used as refrigerant. 
     
     
         8 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said refrigerant gas to be discharged for cooling said power semiconductor element in said drive circuit is refrigerant gas to be discharged which has passed through a built-in motor and a compression part in this order. 
     
     
         9 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said refrigerant gas to be discharged for cooling said power semiconductor element in said drive circuit is refrigerant gas to be discharged which has passed through a compression part and a built-in motor in this order. 
     
     
         10 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said refrigerant gas to be discharged for cooling said power semiconductor element in said drive circuit is refrigerant gas to be discharged which passes through a built-in motor part after having passed through a compression part. 
     
     
         11 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said electric compressor is a scroll-type compressor. 
     
     
         12 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said electric compressor is a compressor mounted on a vehicle. 
     
     
         13 . The drive circuit-integrated electric compressor according to  claim 1 , wherein said electric compressor is a compressor installed in a refrigeration circuit of an air conditioning system for vehicles.