Patent ID: 11875869
Assignee: NAVAL UNIVERSITY OF ENGINEERING
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An insulated gate bipolar transistor (IGBT) physical model parameter extraction method, comprising: obtaining an initial value and a transformation range of an IGBT physical model parameter; and correcting a model parameter according to a correspondence between IGBT dynamic and static features and the IGBT physical model parameter and in combination with an experiment measurement result of the IGBT physical model parameter; wherein:
the IGBT dynamic and static features under a typical working condition are obtained from a data handbook; a typical value of the relevant parameter of an IGBT physical model is obtained by a theoretical calculation; and a reasonable variation range of the typical value of the IGBT physical model parameter is obtained according to a semiconductor physical mechanism;
the calculation of the initial value and reasonable range of the IGBT physical model parameter comprises:
(1) base doping concentration NL:, N
        L
       
       =
       
        
         1
         .
         9
        
        ⁢
        3
        ⁢
        2
        ×
        1
        ⁢
        
         0
         
          1
          ⁢
          8
         
        
        ⁢
        
         V
         B
         
          -
          1.4
         
        
       
      
      ;
     
    
   
   
    
     symmetrical
     ⁢
        
     structure
     ⁢
     
      (
      
       1
       -
       a
      
      )
     
    
   
  
 

 
  
   
    
     
      
       
        V
       
       B
      
      =
      
       
        
         
          W
          L
         
         [
         
          
           2
           ⁢
           q
           ⁢
           
            
             N
             L
            
            (
            
             8
             ×
             1
             ⁢
             
              0
              3
             
             ⁢
             
              N
              L
              
               -
               0.75
              
             
            
            )
           
          
          
           
            ε
            Si
           
           ⁢
           
            ε
            0
           
          
         
         ]
        
        
         1
         2
        
       
       -
       
        
         q
         ⁢
         
          N
          L
         
         ⁢
         
          W
          L
          2
         
        
        
         2
         ⁢
         
          ε
          Si
         
         ⁢
         
          ε
          0
         
        
       
      
     
     ;
    
   
   
    
     asymmetrical
     ⁢
        
     structure
     ⁢
        
     
      (
      
       1
       -
       b
      
      )
     
    
   
  
 

in which, VB represents a forward breakdown voltage of a collector-emitter of IGBT, WL represents a base width, q represents an electron charge constant, εsi represents a relative permittivity of silicon, and ε0 represents a permittivity of air;
(2) base width WL:, W
       L
      
      =
      
       
        2
        .
        6
       
       ⁢
       7
       ×
       1
       ⁢
       
        
         0
         
          1
          ⁢
          0
         
        
        ·
        
         N
         L
         
          -
          
           7
           8
          
         
        
       
      
     
     ;
    
   
   
    
     (
     2
     )
    
   
  
 

(3) lifetime of excess carrier in a base region τL:, τ
       L
      
      =
      
       
        t
        off
       
       
        ln
        [
        
         10
         ⁢
         
          α
          pnp
         
        
        ]
       
      
     
     ;
    
   
   
    
     (
     3
     )
    
   
  
 

 
  
   
    
     
      
       α
       
        p
        ⁢
        n
        ⁢
        p
       
      
      =
      
       sec
       ⁢
       
        h
        (
        
         
          W
          L
         
         
          L
          L
         
        
        )
       
      
     
     ;
    
   
   
    
     (
     4
     )
    
   
  
 

in which, αpnp represents a common base current amplification factor of parasitic PNP transistor in the IGBT, toff represents a current turn-off time of IGBT, LL represents a hole diffusion coefficient of the base region;
(4) trans-conductance coefficient Kp:, K
       p
      
      =
      
       
        2
        ×
        
         I
         
          M
          ⁢
          O
          ⁢
          S
         
         
          s
          ⁢
          a
          ⁢
          t
         
        
       
       
        
         (
         
          
           V
           
            G
            ⁢
            S
           
          
          -
          
           V
           
            t
            ⁢
            h
           
          
         
         )
        
        2
       
      
     
     ;
    
   
   
    
     (
     5
     )
    
   
  
 

 
  
   
    
     
      
       
        I
       
       
        M
        ⁢
        O
        ⁢
        S
       
       
        s
        ⁢
        a
        ⁢
        t
       
      
      =
      
       
        I
        
         C
         ⁢
         E
        
        
         s
         ⁢
         a
         ⁢
         t
        
       
       
        1
        +
        
         β
         
          s
          ⁢
          s
         
        
       
      
     
     ;
    
   
   
    
     (
     6
     )
    
   
  
 

 
  
   
    
     
      
       β
       
        s
        ⁢
        s
       
      
      =
      
       
        
         
          1
          b
         
         ⁢
         
          P
          0
         
        
        +
        
         
          Q
          1
         
         (
         
          
           1
           b
          
          +
          
           1
           
            cos
            ⁢
            
             h
             ⁡
             (
             
              
               W
               ⁡
               (
               t
               )
              
              
               L
               L
              
             
             )
            
           
          
         
         )
        
       
       
        
         P
         0
        
        +
        
         
          Q
          1
         
         (
         
          1
          -
          
           1
           
            cos
            ⁢
            
             h
             ⁡
             (
             
              
               W
               ⁡
               (
               t
               )
              
              
               L
               L
              
             
             )
            
           
          
         
         )
        
       
      
     
     ;
    
   
   
    
     (
     7
     )
    
   
  
 

in which, P0 represents a concentration of the excess carrier of the base region near an edge of a collector PN junction, Q1 represents an equivalent carrier charge of the base region, IMOSsat represents a saturation current of MOSFET, VGS represents a gate-emitter voltage of IGBT, Vth represents a threshold voltage of IGBT, ICEsat represents an on-state current of IGBT, βss represents an equivalent current amplification coefficient of IGBT, W(t) represents a quasi-neutral base width, b represents a ratio of electron mobility to hole mobility, and LL represents a hole diffusion coefficient of the base region; Kp is obtained by putting VGS, Vth and ICEsat into the formulas, ICEsat and the corresponding VGS is obtained from a device data handbook;
(5) gate oxide layer capacitance COXD:, according to a junction capacitance expression, an initial value of a gate-collector capacitance CGDJ is estimated firstly, and then an initial value of the gate oxide layer capacitance COXD is obtained through a Miller capacitance CGD, and the Miller capacitance CGD is obtained from the data handbook;
(6) gate-emitter capacitance CGS:
the gate-emitter capacitance CGS is approximately equal to the difference between an input capacitance Cies of IGBT and a feedback capacitance Cres of IGBT, and an initial value and reasonable order of magnitude of the gate-emitter capacitance CGS are calculated by formula (8), wherein the feedback capacitance Cres and the input capacitance Cies are directly obtained from the data handbook:

CGS=Cies−Cres  (8);

(7) other model parameters:
an initial value and reasonable correction range of the threshold voltage Vth are obtained from the data handbook, and a structure size parameter is obtained by physical measurement; according to the information disclosed by an IGBT manufacturer, a reference concentration of a buffer layer NH, the lifetime of the excess carrier of the buffer layer τH and a reasonable order of magnitude of a buffer layer width WH are obtained; a lifetime of minority carrier in the buffer layer of IGBT is determined by a doping concentration of the carrier; when a dispersion range of a semiconductor process parameter is put into a calculation formula of an initial value of the parameter, the variation range of the initial value of the model parameter is obtained, so that the initial value of the model parameter and its reasonable range are determined.