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Electric circuit

  • US 6,828,693 B2
  • Filed: 02/05/2002
  • Issued: 12/07/2004
  • Est. Priority Date: 08/10/1999
  • Status: Expired due to Fees
First Claim
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1. An electric circuit for an electrical system in a motor vehicle, the electrical system being powered by a voltage supply and having two functional states, the electric circuit comprising:

  • at least one control stage including a switching device, an electronic switching module, a single signal output, and a single connecting line connecting the signal output to the electrical system;

    the switching device including at least one manually operated push-button switching element switchable between two switching states for generating respective switching state output signals at the signal output in order to switch the electrical system between the two functional states;

    the electronic switching module including a non-volatile flip-flop formed by EEPROM cells which are operable for storing the switching state of the switching element, wherein the electronic switching module maintains the switching state output signal corresponding to the stored switching state at the signal output to maintain the functional state of the electrical system until the switching element is switched to the other switching state, and maintains the switching state output signal corresponding to the stored switching state at the signal output to maintain the functional state of the electrical system during an interruption of power from the voltage supply to the electrical system;

    the electronic switching module further includes an evaluation stage operable for scanning respective states of the EEPROM cells of the flip-flop;

    wherein the evaluation stage includes a test component and a control logic, the control logic including a probability component, wherein the test component is operable for checking the respective states of the EEPROM cells and correspondingly influences the control logic if the respective states of the EEPROM cells are identical, wherein the probability component exercises an influence corresponding to the majority of states if the respective states of the EEPROM cells are not identical.

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