Patent ID: 11966683
Assignee: WUHAN UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. The method for comprehensively evaluating the reliability of the multi-chip parallel IGBT module according to claim 3, wherein the linear correlation PPMCCB=r({right arrow over (m)}, {right arrow over (n)}p) between the transmission characteristic curve in the bonding wire shedding failure state and the healthy state is obtained from, PPMCC
      B
    
    =
    
      
        r
        ⁡
        
          (
          
            
              m
              →
            
            ,
            
              
                n
                p
              
              →
            
          
          )
        
      
      =
      
        
          
            ∑
            
              q
              =
              1
            
            l
          
          ⁢
          
            
              (
              
                
                  m
                  q
                
                -
                
                  m
                  _
                
              
              )
            
            ⁢
            
              (
              
                
                  n
                  
                    p
                    ⁢
                    q
                  
                
                -
                
                  
                    n
                    _
                  
                  p
                
              
              )
            
          
        
        
          
            
              
                ∑
                
                  q
                  =
                  1
                
                l
              
              ⁢
              
                
                  (
                  
                    
                      m
                      p
                    
                    -
                    
                      m
                      _
                    
                  
                  )
                
                2
              
            
          
          ⁢
          
            
              
                ∑
                
                  q
                  =
                  1
                
                l
              
              ⁢
              
                
                  (
                  
                    
                      n
                      
                        p
                        ⁢
                        q
                      
                    
                    -
                    
                      
                        n
                        _
                      
                      p
                    
                  
                  )
                
                2
              
            
          
        
      
    
  
  ,

where 1 represents a number of selected samples, mq represents an observed value of a point q corresponding to the transmission characteristic curve eigenvector {right arrow over (m)}of the module without bonding wire shedding, {right arrow over (m)} represents a mean of observed values of the eigenvector {right arrow over (m)}, npq represents an observed value of the point q corresponding to the transmission characteristic curve eigenvector {right arrow over (np)} of the module when p bonding wires shed, and np represents a mean of observed values of the eigenvector np.