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On-board power supply protection

  • US 9,041,244 B2
  • Filed: 12/30/2010
  • Issued: 05/26/2015
  • Est. Priority Date: 12/30/2010
  • Status: Active Grant
First Claim
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1. An on-board power supply system, the system comprising:

  • a first power supply terminal and a second power supply terminal configured to have a battery and/or a generator connected thereto, wherein the power supply system is configured to have a first electrical polarity applied to the first and second power supply terminals;

    a first external terminal coupled to the first power supply terminal and a second external terminal coupled to the second power supply terminal; and

    a protection unit connected between the first external terminal and the first power supply terminal,wherein the protection unit comprises;

    a semiconductor switching unit having a load path and a control terminal, the load path connected between the first external terminal and the first power supply terminal; and

    a control circuit coupled to the control terminal of the semiconductor switching unit and configured to switch the semiconductor switching unit on and off dependent on at least one electrical parameter in the on-board power supply system, whereinthe control circuit is configured to turn the semiconductor switching unit off when the at least one electrical parameter indicates that an electrical polarity applied to the first and second external terminals is opposite the first electrical polarity,the first electrical polarity is supplied to the first and second power supply terminals and the battery and/or the generator connected thereto when the semiconductor switching unit is turned off, andthe at least one electrical parameter comprises a first voltage between the first and second external terminals, wherein the control circuit is configured to switch the semiconductor switching unit on and off dependent on the first voltage between the external terminals and dependent on a second voltage across the protection unit.

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