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Method and apparatus for achieving current balance in parallel connected switching devices

  • US 5,338,994 A
  • Filed: 06/04/1993
  • Issued: 08/16/1994
  • Est. Priority Date: 07/20/1989
  • Status: Expired due to Fees
First Claim
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1. For transferring electrical power between two electrical power sources, a switching arrangement comprising:

  • a) at least one plurality of series connections each comprising a switching device and an inductor, the series connections being connected in parallel with the parallel combination being connected between said two power sources;

    b) means to control the conductive state of said switching devices to effect periods of simultaneous current within each of the series connections alternating with periods of no current within said connections;

    c) means to provide individual current signals representing the respective currents in each of the simultaneously conducting devices of said plurality;

    d) means to provide an average current signal representing the average value of said individual current signals;

    e) means to develop a difference signal as a function of the difference between the respective individual current signal and the average current signal;

    f) means to integrate said difference signal to provide an integrated signal;

    f) means to generate control signals operative to render conductive associated ones of said switching devices; and

    ,g) means responsive to said integrated signal to vary the time, with respect to a predetermined norm of associated devices, of application of said control signal to the associated ones of said devices whereby differences in current value within said devices are reduced.

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