Power conversion apparatus

Abstract

A power conversion apparatus connected to three or more voltage units, includes three or more power conversion circuits connected to respective units of the three or more voltage units; and a multiport transformer connected to the three or more power conversion circuits at mutually different ports, in which at least one voltage unit of the three or more voltage units is an electrical load.

What is claimed is: 
     
         1 . A power conversion apparatus connected to a plurality of voltage units, the power conversion apparatus comprising:
 a plurality of power conversion circuits, each power conversion circuit having a first port and a second port, the first port of each power conversion circuit being connected to a respective voltage unit of the plurality of voltage units; and   a multiport transformer connected to the second port of each of the plurality of power conversion circuits, wherein   the plurality of power conversion circuits and the multiport transformer are configured as a multiple active bridge in which each of the plurality power conversion circuits is a switching circuit configured as a voltage-voltage type bridge circuit,   the plurality of voltage units comprises a heater, a low voltage battery, and a high voltage battery having a voltage that is higher than a voltage of the low voltage battery, and   each of the high voltage battery and the low voltage battery is configured to supply power to the heater.   
     
     
         2 . The power conversion apparatus according to  claim 1 , wherein
 the voltage-voltage type bridge circuit does not include an inductor.   
     
     
         3 . A power conversion apparatus connected to a plurality of voltage units, the power conversion apparatus comprising:
 a plurality of power conversion circuits, each power conversion circuit having a first port and a second port, the first port of each power conversion circuit being connected to a respective voltage unit of the plurality of voltage units; and   a multiport transformer connected to the second port of each of the plurality of power conversion circuits, wherein   the plurality of power conversion circuits and the multiport transformer are configured as a multiple active bridge in which each of the plurality power conversion circuits is a switching circuit configured as a voltage-voltage type bridge circuit,   the plurality of voltage units comprises a heater, a low voltage battery, a high voltage battery having a voltage that is higher than a voltage of the low voltage battery, and an AC power source, and   each of the high voltage battery, the low voltage battery, and the AC power source is configured to supply power to the heater.   
     
     
         4 . The power conversion apparatus according to  claim 3 , wherein
 the voltage-voltage type bridge circuit does not include an inductor.