Energy supply unit, energy supply system having an energy supply unit, and a method for operating an energy supply unit

A method for operating an energy supply unit, the method including the following steps:

• providing a current supply connection with which an electrical energy source, is electrically connected,
• providing a consumer load connection with which a consumer load supplied electrically from the energy source is electrically connected,
• providing a primary power converter with a converter with which the energy from the current supply connection to the consumer load connection is converted and transmitted, and with an auxiliary circuit part, with which at least one operating parameter of the primary power converter is detected and/or the converter is controlled, wherein the auxiliary circuit part is provided with a primary-side energy supply from a primary-side converter voltage fed to the converter,
• providing at least one secondary power converter, which is connected to the current supply connection in parallel with the primary power converter, with which an auxiliary energy is provided on the secondary side, and
• providing a control unit, which is electrically supplied with the auxiliary energy provided by the secondary power converter, wherein the primary power converter is controlled by the control unit in a manner dependent upon the information transmitted between the control unit and the auxiliary circuit part via an information path,
• wherein, when the energy supply unit is in an energy transmission mode, the converter is electrically effectively connected to the current supply connection and the auxiliary circuit part is provided with the primary-side energy supply, and, when the energy supply unit is in a stand-by mode having reduced consumption in comparison with the energy transmission mode, the converter is electrically effectively disconnected from the current supply connection and the primary-side energy supply of the auxiliary circuit part is interrupted.