Method and circuit arrangement for secure control of actuators, sensors and/or users in an electrical device comprising the same in particular in an electrical domestic appliance

A method for secure control of one of actuators, sensors, and loads in an electrical domestic appliance including at least two switch bodies operated in accordance with an AND logic gate for effective switching of the one of actuators, sensors, and loads by control signals acting on the at least two switch bodies, the method comprising:

• issuing a continuous signal and a pulse signal as control signals to a number of bistable control bodies corresponding to a number of the at least two switch bodies,
• switching the number of bistable control bodies into a switched-on state, in which the at least two switch bodies are effectively switched, only by the issuing of the continuous signal and by the issuing of the pulse signal which occurs during the issuing of a relevant continuous signal,
• switching the at least two switch bodies into a switched-off state, in which the switch bodies are switched off, solely by switching off the continuous signal, and
• maintaining the at least two switch bodies in the switched-off state even if the relevant continuous signal is issued once more.

A circuit arrangement for executing a secure control of one of actuators, sensors, and loads in an electrical appliance containing these components, the circuit arrangement comprising:

• at least two switch bodies operated in accordance with an AND logic gate for effective switching of the one of the actuators, sensors, and loads by control signals acting on the at least two switch bodies;
• a pulse signal issuing device and a continuous signal issuing device for issuing a control signal,
• wherein one of the pulse signal issuing device and the continuous signal issuing device issue one of a pulse signal and a continuous signal to a number of bistable control bodies corresponding to a number of the at least two switch bodies, and
• wherein the bistable control bodies are switched into a switched-on state, in which the at least two switch bodies are effectively switched, by the issuing of the continuous signal and of the pulse signal,
• wherein the at least two switch bodies are switched into a switched-off state, in which the at least two switch bodies are effectively switched off, solely by switching of the continuous signal, and are kept in the switched-off state even on renewed issuing of a relevant continuous signal.