Patent ID: 11949327
Assignee: HAMILTON SUNDSTRAND CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A power factor correction circuit comprising:
a global voltage input; and
means for deriving a reference current from the global voltage, the means for deriving including first and second power stages defining two branches, a first branch drawing a current in phase with a load voltage and a second branch drawing a leading phase current which combine to derive the reference current from the global voltage;
whereby the means for deriving the reference current comprises a leading phase admittance cancellation (LPAC) transfer function and a filter, whereby the reference current is derived from a sum of an output of the LPAC transfer function and an output of the filter, such that the power factor correction circuit has a closed-loop admittance transfer function of:, Y
   ⁡
   (
   s
   )
  
  =
  
   
    
     
      i
      g
     
     (
     s
     )
    
    
     
      v
      s
     
     (
     s
     )
    
   
   =
   
    
     
      
       G
       iv
      
      (
      s
      )
     
     
      1
      +
      
       T
       i
      
     
    
    +
    
     
      
       
        
         G
         id
        
        (
        s
        )
       
       ⁢
       
        F
        m
       
       ⁢
       
        H
        i
       
      
      
       1
       +
       
        T
        l
       
      
     
     ⁢
     
      k
      x
     
     ⁢
     
      V
      c
     
     ⁢
     
      Filter
      1
     
    
   
  
 

where the filter has the form:, Filter
      1
     
     =
     
      
       
        
         V
         o
        
        ⁢
        
         F
         m
        
        ⁢
        
         H
         i
        
        ⁢
        
         k
         x
        
        ⁢
        
         V
         c
        
        ⁢
        Filter
       
       -
       1
      
      
       
        V
        o
       
       ⁢
       
        F
        m
       
       ⁢
       
        H
        i
       
       ⁢
       
        k
        x
       
       ⁢
       
        V
        c
       
      
     
    
   
  
  
   
    
     =
     
      Filter
      -
      
       1
       
        
         V
         o
        
        ⁢
        
         F
         m
        
        ⁢
        
         H
         i
        
        ⁢
        
         k
         x
        
        ⁢
        
         V
         c
        
       
      
     
    
   
  
 

where:
ig is a global current;
vs is a global voltage;
Giv is a first power stage transfer function;
Gid is a second power stage transfer function;
Fm is a modulator gain;
kx is an input voltage gain;
Vc is an output of a voltage loop in the power factor correction circuit; and
Vo is a DC voltage.