Abstract: A method removes coatings from a surface. The method includes: applying a stripping agent to the coating to be detached in order to produce a cohesive bond, such that the bond between the stripping agent and the coating to be detached is stronger than the bond between the coating to be detached and the surface; and stripping off the stripping agent together with the coating to be detached adhering thereto.

Abstract: An electrical system comprises at least one high-voltage battery, at least one DC link capacitor and at least two power relays, whereby one power relay is arranged between a positive connector of the high-voltage battery and the DC link capacitor, while the other power relay is arranged between a negative connector of the high-voltage battery and the DC link capacitor, whereby the electrical system has a galvanically isolated DC/DC converter that is connected to a voltage source in the electrical system, whereby the DC/DC converter is configured such that it can transmit electric energy to a high-voltage side with the DC link capacitor in order to pre-charge the DC link capacitor, whereby the electrical system has a diagnostic device to test the power relays, whereby the diagnostic device has switchable voltage sensors.

Abstract: An electrical system comprises at least one high-voltage battery, at least one DC link capacitor and at least two power relays, whereby one power relay is arranged between a positive connector of the high-voltage battery and the DC link capacitor, while the other power relay is arranged between a negative connector of the high-voltage battery and the DC link capacitor, whereby the electrical system has a galvanically isolated DC/DC converter that is connected to a voltage source in the electrical system, whereby the DC/DC converter is configured such that it can transmit electric energy to a high-voltage side with the DC link capacitor in order to pre-charge the DC link capacitor, whereby the electrical system has a diagnostic device to test the power relays, whereby the diagnostic device has switchable voltage sensors, whereby one voltage sensor is arranged in parallel to the high-voltage battery, one voltage sensor is arranged in parallel to the DC link capacitor, in each case, one voltage sensor is arrange

Abstract: A device for converting direct voltage from an electrochemical store or a fuel cell to alternating voltage, includes a two-stage design having a single DC/DC converter stage for generating an intermediate circuit voltage from the output voltage of the electrochemical store or the fuel cell, which converter stage converts, in particular raises, the direct voltage in a wide input voltage range directly to an intermediate circuit voltage with which a DC/AC converter stage can be operated to generate the alternating voltage. The single DC/AC converter stage generates the alternating voltage from the intermediate circuit voltage. The invention further relates to a method for actuating a device for converting direct voltage from a store or energy generator into alternating voltage for feeding into a supply network.

Abstract: The disclosure relates to a method for operating a DC/DC voltage converter comprising a first switching bridge with at least two first switches coupled to an input of the DC/DC voltage converter, a second switching bridge with at least two second switches coupled to an output of the DC/DC voltage converter, a transformer and at least one capacitor, wherein the first switching bridge is connected to the second switching bridge via the transformer. The first switches are switched such that a resonant circuit formed by the transformer and the at least one capacitor is operated in resonance, and the second switches are switched at the same clock frequency with a phase shift compared to the first switches, such that the second switches are switched prior to the first switches. The disclosure also relates to a DC/DC voltage converter comprising a control circuit for the first and second switches which is configured to carry out the method, and to a backup power system including such a DC/DC voltage converter.

Abstract: A device for converting direct voltage from an electrochemical store or a fuel cell to alternating voltage, includes a two-stage design having a single DC/DC converter stage for generating an intermediate circuit voltage from the output voltage of the electrochemical store or the fuel cell, which converter stage converts, in particular raises, the direct voltage in a wide input voltage range directly to an intermediate circuit voltage with which a DC/AC converter stage can be operated to generate the alternating voltage. The single DC/AC converter stage generates the alternating voltage from the intermediate circuit voltage. The invention further relates to a method for actuating a device for converting direct voltage from a store or energy generator into alternating voltage for feeding into a supply network.