Patent ID: 11929346
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 4:
5. The method according to claim 4, characterized in that the evolution of the junction temperature during the operation of the power semiconductor is estimated according to a rain flow algorithm that treats the historical data of the junction temperature in order to determine the W different temperature levels and the number of cycles Ncw at a given temperature swing ΔTjw and at a given average temperature Tjw, combined with a linear accumulation rule based on a damage-law using the following formula:, ∑
    
     w
     =
     1
    
    W
   
   
    Ncw
    
     
      A
      ·
      Δ
     
     ⁢
     
      Tjw
      ·
      
       exp
       ⁡
       (
       
        1
        
         Kc
         ·
         Tjw
        
       
       )
      
     
    
   
  
  ≥
  1
 

where the coefficients A, α, Kc are previously determined with power cycling tests.