Abstract: A resonant DC-DC converter includes an inverter circuit, a rectifier circuit and a transformer unit. The inverter circuit is connected to a first terminal of the transformer unit, and the rectifier circuit is connected to a second terminal of the transformer unit. The first and second terminals are galvanically isolated from one another by a first transformer. The transformer unit is configured to adapt a transformation ratio of the transformer unit. The transformer unit has an energy transmission path which includes an inverter and a second transformer, with an input of the energy transmission path being arranged parallel to a primary side of the first transformer and an output of the energy transmission path being arranged in series with the secondary side of the first transformer.

Abstract: A method for controlling a converter, wherein positive and negative lines of an intermediate circuit are connected by a half-bridge to an alternating voltage phase conductor via semiconductor switches, where each semiconductor switch has a series connected separate fuse, and where the method includes detecting a defective semiconductor switch that permanently remains in an electrically conductive state and incrementally melting the fuse of the defective semiconductor switch by short-circuiting the positive and the negative lines to each other multiple times via the defective semiconductor switch and via at least two others of the semiconductor switches, during which each short circuit lasts only one pulse duration Tsoa that is shorter than a melting duration Ta needed by the fuse to melt in the event of a continuous short circuit such that the converter robustly reacts in the event of a permanent short circuit caused by one of the semiconductor switches.

Abstract: A converter for an aircraft includes an intermediate circuit for providing a DC voltage between a positive line and a negative line, at least two rectifiers connected to the intermediate circuit to produce the DC voltage from input AC voltages and at least two inverters connected to the intermediate circuit to produce AC output voltages from the DC voltage. The DC voltage terminals of the rectifiers are connected to a first series circuit and the DC voltage terminals of the inverters are connected to a second series circuit. The positive line and the negative line of the intermediate circuit are connected on an input side via the first series circuit and on the output side via the second series circuit. At least one of the DC voltage terminals includes a short circuit for short-circuiting terminal contacts by which the DC voltage terminal is connected to the respective series circuit.

Abstract: The invention relates to an apparatus (2) for state of charge compensation having a battery system (10) for providing electrical energy comprising a series connection of a first battery sub-module (13) and a second battery sub-module (13?) having a first voltage conversion module (20?) wherein the first voltage conversion module (20?) is electrically connected to the second battery sub-module (13?), and wherein an electrical component (30) can be connected to the first voltage conversion module (20?) and can be supplied with electrical energy from the connected second battery sub-module (13?), wherein the apparatus (2) has a switching device (26) for switching an electrical connection between the first battery sub-module (13) and the first voltage conversion module (20?) and wherein the apparatus (2) has a control device (11) which is designed to control the switching device (26) such that electrical energy flows from the first battery sub-module (13) to the second battery sub-module (13?) and/or that electri

Abstract: A modular high-frequency converter includes submodules, each having an input-side half bridge and a DC link circuit with a DC link capacitance connected in parallel to the half bridge. A DC link circuit voltage drop across the DC link capacitance of each submodule is controlled to a target voltage by adjusting a duty cycle with a closed-loop control structure having a pilot control and a downstream closed-loop error control. Within the framework of the pilot control, a target value for each duty cycle and a target value for the supply current are determined, using a mathematical model of the converter, based on the load-side output currents flowing out of the DC link voltage circuits and on target values of the DC link circuit voltages. Switch position parameters, which map the effect of the switch positions of the input-side half bridges, are each replaced by an associated duty cycle.