Method for operating an electrical system having a plurality of electrical loads, power supply unit, and electrically operated system

A power supply unit, comprising:

• at least one output for supplying a voltage to a plurality of electrical loads;
• at least one first input which is connected to an output of a voltage source which supplies a basic supply voltage;
• at least one second input which is connected to an output of an energy store unit which supplies a buffer voltage upon failure of the basic supply voltage;
• wherein the power supply unit is configured to perform a regulated switch-on process of at least one electrical load of the plurality of electrical load to:
• initiate an adjustable switch-on delay time;
• re-run, in an event of failure of the basic supply voltage before expiration of a predetermined adjustable switch-on delay time, the adjustable switch-on delay time, beginning from an instant in time at which the basic supply voltage fails and repeat the re-running of the adjustable switch-on delay time, until one of (i) the basic supply voltage is available again, (ii) after checking a charge level of the energy store unit, the buffer voltage is output at the output of the power supply unit as an output voltage as a function of the charge level, (iii) a charge level of the energy store unit has reached a threshold value and (iv) adjusting the delay in a self-learning manner;
• and
• output, at the output of the power supply unit, the output voltage one of (i) immediately in a presence of the basic supply voltage or the buffer voltage and (ii) only after a multiple of the adjustable switch-on delay time has elapsed.

A non-transitory computer readable medium encoded with a computer program having program code instructions which, when executed by a processor of a computer, causes operation of an electrical system having a plurality of electrical loads which are connected to at least one power supply unit and are supplied with voltage by said power supply system, the at least one power supply unit one of (ii) connecting through a basic supply voltage and (ii) connecting through a buffer voltage which is provided by an energy store unit in cases of a failure of the basic supply voltage, an adjustable switch-on delay time being predetermined or determined in order to perform a regulated switch-on process of a least one electrical load of the plurality of electrical loads, and one of (i) the basic supply voltage and (ii) a buffer voltage at an output of the at least one power supply unit being connected through after expiration of the adjustable switch-on delay time, the computer program comprising:

• program code for re-running, in an event of failure of the basic supply voltage before expiration of the predetermined adjustable switch-on delay time, the adjustable switch-on delay time, beginning from an instant in time at which the basic supply voltage fails and repeating the re-running of the adjustable switch-on delay time, until one of (i) the basic supply voltage is available again, (ii) after checking a charge level of the energy store unit, the buffer voltage is output at the output of the power supply unit as an output voltage as a function of the charge level, (iii) a charge level of the energy store unit has reached a threshold value and (iv) adjusting the delay in a self-learning manner;
• and
• program code for outputting at the output of the power supply unit the output voltage one of (i) immediately in a presence of the basic supply voltage or the buffer voltage and (ii) only after a multiple of the adjustable switch-on delay time has elapsed.