Patent ID: 11953538
Assignee: WUHAN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The method according to claim 2, wherein step S2 further comprises:
calculating a life expectancy Nf-IGBT of the entire IGBT circuit through, N
   
    f
    -
    IGBT
   
  
  =
  
   
    ∫
    0
    
     +
     ∞
    
   
   
    
     
      Ne
      
       -
       
        [
        
         
          
           (
           
            N
            /
            
             η
             1
            
           
           )
          
          
           m
           1
          
         
         +
         
          
           (
           
            N
            /
            
             η
             2
            
           
           )
          
          
           m
           2
          
         
        
       
      
     
     [
     
      
       
        
         m
         1
        
        
         η
         1
        
       
       ⁢
       
        
         (
         
          N
          
           η
           1
          
         
         )
        
        
         
          m
          1
         
         -
         1
        
       
      
      +
      
       
        
         m
         2
        
        
         η
         2
        
       
       ⁢
       
        
         (
         
          N
          
           η
           2
          
         
         )
        
        
         
          m
          2
         
         -
         1
        
       
      
     
     ]
    
    ⁢
    d
    ⁢
    
     N
     .