Patent ID: 11862993
Assignee: UTAH STATE UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 17:
18. A system comprising:
a wireless power transfer (“WPT”) charging apparatus comprising:
an inverter configured to connect with a direct current (“DC”) source on an input side; and
a plurality of WPT charging branches, each WPT charging branch comprising:
a WPT charging pad circuit comprising a WPT charging pad connected in series with a first series charging capacitor;
a parallel charging capacitor connected in parallel with the WPT charging pad circuit; and
a series charging impedance connected in series between an output of the inverter and a connection between the WPT charging pad circuit and the parallel charging capacitor, the series charging impedance comprising a second series charging capacitor and a series charging inductor; and

a WPT receiver apparatus comprising:
a rectification section comprising an output configured to connect to a load;
a WPT receiver branch comprising:
a WPT receiver pad connected in series with a first series receiver capacitor;
a parallel receiver capacitor connected in parallel with a branch comprising the WPT receiver and first series receiver capacitor; and
a second series receiver capacitor connected in series between a connection to the WPT receiver branch and an input of the rectification section,

wherein the WPT receiver pad is mobile with respect to each of the one or more the WPT charging pads, and wherein:, n
      1
     
     =
     
      
       
        C
        
         1
         ,
         p
        
       
       
        C
        
         1
         ,
         sa
        
       
      
      +
      
       1
       ⁢
       
        (
        
         
          n
          1
         
         >
         0
        
        )
       
      
     
    
   
  
  
   
    
     
      C
      
       1
       ,
       sa
      
      ′
     
     =
     
      
       C
       
        1
        ,
        sa
       
      
      
       1
       +
       
        
         ω
         2
        
        ⁢
        
         L
         
          1
          ,
          sa
         
        
        ⁢
        
         C
         
          1
          ,
          sa
         
        
       
      
     
    
   
  
  
   
    
     
      
       n
       2
      
      =
      
       
        
         C
         
          r
          ,
          p
         
        
        
         C
         
          r
          ,
          sb
         
        
       
       +
       
        1
        ⁢
        
         (
         
          
           n
           2
          
          >
          1
         
         )
        
       
      
     
     ,
    
   
  
  
   
    
     
      n
      3
     
     =
     
      
       
        C
        
         r
         ,
         p
        
       
       
        C
        
         r
         ,
         sa
        
       
      
      +
      
       1
       ⁢
       
        (
        
         
          n
          3
         
         >
         1
        
        )
       
      
     
    
   
  
 

wherein:
C1,sa is second series charging capacitor;
ω is an angular switching frequency of the inverter;
C1,p is the parallel receiver capacitor;
L1,sa is the series charging inductance;
Cr,p is the parallel receiver capacitor;
Cr,sb is the first series receiver capacitor;
Cr,sa is the second series receiver capacitor;
n1 is a buck-boost factor of an equivalent input voltage at the output of the inverter;
n2 is a ratio relating the parallel receiver capacitor to the first series receiver capacitor; and
n3 is a ratio relating the parallel receiver capacitor to the second series receiver capacitor.