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Bi-directional battery voltage converter

  • US 9,199,543 B2
  • Filed: 07/29/2010
  • Issued: 12/01/2015
  • Est. Priority Date: 07/31/2009
  • Status: Active Grant
First Claim
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1. A method of charging batteries in a vehicle electrical system, the vehicle electrical system comprising a system bus, a first switch selectively connecting a first battery with the system bus, a second switch selectively connecting a second battery with the system bus, and a controller monitoring a voltage of the vehicle electrical system and controllably opening and closing the first switch and the second switch, the method comprising:

  • a) opening the first switch and the second switch until the first switch and the second switch are open at the same time, thereby disconnecting the first battery and the second battery from the system bus;

    b) closing the first switch, thereby connecting the first battery with the system bus;

    c) monitoring the voltage of the vehicle electrical system in transient response to the first switch closing;

    d) opening the first switch if the voltage of the vehicle electrical system traverses a threshold value in transient response to the first switch closing;

    e) closing the second switch, thereby connecting the second battery with the system bus;

    f) monitoring the voltage of the vehicle electrical system in transient response to the second switch closing; and

    g) opening the second switch if the voltage of the vehicle electrical system traverses the threshold value in transient response to the second switch closing; and

    repeating the steps of b, c, d, e, f, and g until the first switch and second switch remain closed.

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