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Motor vehicle electrical system having an active bridge rectifier and overvoltage protection during a load dump, rectifier system, associated operating method and means for its implementation

  • US 9,641,097 B2
  • Filed: 05/15/2014
  • Issued: 05/02/2017
  • Est. Priority Date: 05/15/2013
  • Status: Active Grant
First Claim
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1. A vehicle electrical system, comprising:

  • an active bridge rectifier connected to a generator via multiple phase terminals, the active bridge rectifier having terminals on a direct voltage side;

    a load shedding recognition unit which recognizes load shedding at the active bridge rectifier in response to a voltage between the terminals of the bridge rectifier on the direct voltage side rising above a first predetermined voltage threshold, and short-circuits the phase terminals during the load shedding in a clocked manner so that the active bridge rectifier provides a pulsed current including an on phase during a rectifying operation and an off phase during the load shedding;

    at least one vehicle electrical system capacitor connected to the direct voltage side of the active bridge rectifier to receive a portion of the pulsed current during the rectifying operation and provide a current to the vehicle electrical system during the load shedding; and

    a voltage limiter which clips the voltage between the terminals of the bridge rectifier on the direct voltage side in response to the voltage between the terminals of the bridge rectifier on the direct voltage side rising above a second predetermined voltage threshold during transitions between the rectifying operation and the load shedding, the second predetermined voltage threshold being greater than the first predetermined voltage threshold.

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