FIELD: electricity.
SUBSTANCE: invention is referred to power supply unit and electric signal and/or power supply method for an electrically operated device. The power supply unit (10) has an instrument (34) to measure the parameter, at that the parameter is fit for identification of an exterior capacitance coupled between one element (22) and the other element (24) of connecting elements (22, 24, 26, 28) of the power supply unit (10) on the basis of the above parameter, at that the power supply unit (10) is made to identify a specific type of an electrically operated device (12) on the basis of the identified exterior capacitance, and parameters include current depending on time and voltage depending on time.
EFFECT: potential identification of a specific type for the electrically operated device on the basis of the identified exterior capacitance.
14 cl, 3 dwg
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