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

Claim 11:
12. A method for controlling a power conversion apparatus, the method comprising:
providing the power conversion apparatus, which comprises:
a conversion circuit configured to convert DC voltage to AC voltage,
an isolation transformer comprising an input side and an output side,
a rectifier circuit,
a resonance circuit, and
a control circuit, wherein:
the conversion circuit comprises a switching element,
the conversion circuit and the input side of the isolation transformer are connected,
the resonance circuit comprises a filter inductor and a junction capacitor,
the resonance circuit and the output side of the isolation transformer are connected, and
the rectifier circuit and the output side of the isolation transformer are connected;

turning 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
controlling 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, “yin” 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 resonance frequency of the resonance circuit, and “n” represents a natural number.