Frequency Converter

Abstract

A frequency converter includes a radiating section having a base and fins for radiating heat from a power semiconductor, a circuit substrate being provided at an opposite side of the fins with respect to the base, a housing that covers the circuit substrate, a guide for flowing air between the housing and the circuit substrate toward a downstream side of the fins, and a fan. The fan flows the air flown to the downstream side of the fins by the guide toward an upstream side of the fins.

1 . A frequency converter comprising:
 a radiating section having a base and fins for radiating heat from a power semiconductor;   a circuit substrate provided at an opposite side of said fins with respect to said base;   a housing that covers said circuit substrate;   a guide for flowing air between said housing and said circuit substrate toward a downstream side of said fins; and   a fan for flowing the air flown to the downstream side of said fins by said guide toward an upstream side of said fins.   
   
   
       2 . The frequency converter according to  claim 1 , wherein said guide is provided for flowing the air between said circuit substrate and said base toward a downstream side of said fins. 
   
   
       3 . The frequency converter according to  claim 2 , wherein said circuit substrate includes a control circuit for controlling said frequency converter. 
   
   
       4 . The frequency converter according to  claim 3 , wherein a CPU for controlling said control circuit is provided at the upstream side of said power semiconductor. 
   
   
       5 . The frequency converter according to  claim 5 , wherein said fan is provided at an upstream side of said fins. 
   
   
       6 . A frequency converter comprising:
 a first substrate having a power semiconductor;   a second substrate having a control circuit for controlling the frequency converter;   a housing that covers the first and second substrates;   a radiating section having a base and fins for radiating heat of said power semiconductor; and   a guide for flowing air between said first substrate and said second substrate toward a downstream side of said fins; and   a fan for flowing the air flown to the downstream side of said fins by said guide toward the upstream side of said fins.   
   
   
       7 . A frequency converter according to  claim 6 , wherein said first substrate and said second substrate are provided at an opposite side of said fins with respect to said base. 
   
   
       8 . The frequency converter according to  claim 6 , wherein said guide flows the air between said second substrate and said housing to the downstream side of said fins. 
   
   
       9 . The frequency converter according to  claim 5 , wherein said control circuit provides with a CPU, said CPU being located at an upstream side of said power semiconductor. 
   
   
       10 . The frequency converter according to  claim 6 , wherein said fan is provided at an upstream side of said fins.