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Use of SCR's in extended retarding

  • US 4,698,561 A
  • Filed: 09/29/1986
  • Issued: 10/06/1987
  • Est. Priority Date: 09/29/1986
  • Status: Expired due to Fees
First Claim
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1. In a drive system for a vehicle wherein an alternator driven by a power source produces AC current that is rectified to DC current before being used to power wheel motors and wherein the drive system provides for retarding of the motion of the vehicle by suspension of the DC current from the alternator that is driving the wheel motors and then allowing the wheel motors to generate a DC current that is directed through a series of resistors to dissipate the energy, the specific improvement comprising:

  • (a) a first SCR located between the output of the DC current generated by the wheel motors during retarding of the motion of the vehicle and the series of resistors through which the DC current is directed to dissipate the energy;

    (b) at least one circuit containing a second SCR wherein said circuit when said second SCR is conductive shunts a portion of the series of resistors through which the DC current generated by the wheel motors is directed; and

    (c) at least one circuit containing a third SCR wherein said circuit when said third SCR is conductive delivers current from said alternator to the cathode of said first SCR such as to back bias said first SCR and allow it to be turned off.

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