Patent ID: 11870355
Assignee: RENAULT S.A.S.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A power conversion apparatus comprising:
a conversion circuit comprising a switching element and configured to convert DC voltage to AC voltage by switching operation of the switching element;
an isolation transformer comprising an input side and an output side, wherein the input side is connected to the conversion circuit;
a rectifier circuit connected to the output side of the isolation transformer;
a resonance circuit connected to the output side of the isolation transformer and comprising a filter inductor and a junction capacitor; and
a control circuit configured to:
turn on the switching element in a period when no voltage is applied to the isolation transformer from the conversion circuit and current flowing from the output side of the isolation transformer to the input side of the isolation transformer flows from a low potential side terminal to a high potential side terminal of the switching element via the isolation transformer; and
control the switching element so that a phase difference of voltage from the conversion circuit (10) to the isolation transformer satisfies following equation (1),, V
         
          o
          ⁢
          u
          ⁢
          t
         
        
        
         2
         ⁢
         N
         ⁢
         
          V
          
           i
           ⁢
           n
          
         
        
       
       ⁢
       
        (
        
         1
         -
         
          
           n
           ⁢
           
            f
            
             s
             ⁢
             w
            
           
          
          
           f
           
            r
            ⁢
            e
            ⁢
            s
           
          
         
        
        )
       
      
      )
     
     ≤
     D
     ≤
     
      
       
        V
        
         o
         ⁢
         u
         ⁢
         t
        
       
       
        2
        ⁢
        N
        ⁢
        
         V
         
          i
          ⁢
          n
         
        
       
      
      ⁢
      
       {
       
        1
        -
        
         
          
           (
           
            
             2
             ⁢
             n
            
            -
            1
           
           )
          
          ⁢
          
           f
           
            s
            ⁢
            w
           
          
         
         
          f
          
           r
           ⁢
           e
           ⁢
           s
          
         
        
       
       }
      
     
    
   
   
    
     (
     1
     )
    
   
  
 

wherein “D” represents the phase difference, “N” represents a winding ratio of the isolation transformer, “Vin” represents input voltage of the power conversion apparatus (200), “Vout” represents output voltage of the power conversion apparatus, “fsw” represents switching frequency of the switching element, “fres” represents a resonance frequency of the resonance circuit, and “n” represents a natural number.