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Electrical apparatus

  • US 3,909,685 A
  • Filed: 10/16/1974
  • Issued: 09/30/1975
  • Est. Priority Date: 01/14/1974
  • Status: Expired due to Term
First Claim
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1. Apparatus that comprises a variable-voltage variablefrequency electric power unit that includes a plurality of stages connected in cascade, each stage having supply voltage means, first bilateral switch means and second bilateral switch means, the first bilateral switch means and the second bilateral switch means acting in combination such that the input of the stage and the output of the stage are shorted together and therefore at equal potential, or said supply voltage means is connected between the input and the output such that the output is positive with respect to the input or the output is negative with respect to the input, the supply voltage means in at least one of the stages of the plurality of stages comprising a switched source assembly having a plurality of electric sources that act in concert through electrical interconnection as the supply voltage means of said one of the stages, and means for changing the interconnectioN of the plurality of electric sources in the switched source assembly, thereby to alter in a determined fashion the voltage and the current available from the switches source assembly and hence from said apparatus.

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