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Electric power converting apparatus for use in battery cars

  • US 4,131,829 A
  • Filed: 10/18/1976
  • Issued: 12/26/1978
  • Est. Priority Date: 10/13/1975
  • Status: Expired due to Term
First Claim
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1. In an electric power converting apparatus for use in a battery car of the type comprising a storage battery, a first inverter including first switching elements for converting the DC voltage of said storage battery into an AC voltage, a step up transformer including primary and secondary windings for stepping up the output AC voltage of said first inverter, a first rectifier for rectifying the secondary voltage of said step up transformer, a second rectifier for rectifying the alternating voltage of an external source of commercial supply, a third inverter including second switching elements connected between the secondary winding of said step up transformer and the output of said second rectifier for converting the output of said second rectifier into an AC voltage for energizing the secondary winding of said step up transformer, and a switching circuit for switching the operations of said first and second inverters, the improvement which comprises rectifier diodes respectively connected directly in parallel opposition with said first switching elements of said first inverter for charging said storage battery and wherein said third inverter is connected to the same secondary winding of said transformer as said first rectifier, said rectifier diodes being connected to the same primary winding of said transformer as said first inverter.

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