Abstract: The invention relates to an energy recovery rectifier device (16), in particular for an industrial plant (2), for connection to an AC system (8), comprising an energy recovery rectifier (24) and a buffer capacitor (46) that is connected in parallel to the DC side (30) of the energy recovery rectifier (24). A step-up converter (52) is connected between the buffer capacitor (46) and the energy recovery rectifier (24). The invention further relates to a method (86) for operating an energy recovery rectifier device (16) as well as to an industrial plant (2) comprising an energy recovery rectifier device (16).

Abstract: The invention relates to an energy recovery rectifier device (16), in particular for an industrial plant (2), for connection to an AC system (8), comprising an energy recovery rectifier (24) and a buffer capacitor (46) that is connected in parallel to the DC side (30) of the energy recovery rectifier (24). A step-up converter (52) is connected between the buffer capacitor (46) and the energy recovery rectifier (24). The invention further relates to a method (86) for operating an energy recovery rectifier device (16) as well as to an industrial plant (2) comprising an energy recovery rectifier device (16).

Abstract: A wide voltage converter includes a power-supply-side converter unit, n load-side converter units, and a step-up/step-down converter device having n transformers. The step-up/step-down converter device electrically connects the power-supply-side converter unit to the n load-side converter units. The wide-voltage-range converter is capable of operating without derating with n specified output voltages, which can be predetermined independent from one another, and reliably inhibits restart.

Abstract: The invention relates to an inverter, and in particular a solar inverter. According to the invention, the inverter has a step-up converter (4), a mains-commutated controlled converter (2) and a filter (6), with the filter (6) being linked on the output side to the AC-side connections 10 (12, 14, 16), and with the step-up converter (4) being linked on the output side to the DC-side connections (8, 10) of the mains-commutated controlled converter (2) with a power semiconductor switch (28) which can be turned off being provided, together with a back-to-back parallel-connected diode (30) in each case as converter valves (T1, T2; T3, T4; T5, T6) for each phase (R, S, T) of the mains-commutated controlled converter (2), and with the controlled side of these power semiconductor switches (28) which can be turned off being linked to a control device (32) to whose inputs phase voltages that have been determined from a power supply system (18) are applied.

Abstract: The invention relates to a drive control for an electric drive with a secure electrical separation of power element and control element. The aim of the invention is to reduce the number of components such as optic couplers and buffer amplifiers between the power element and a control electronics. To this end, a suitable electrical transformer (U) is inserted in a digital communication interface (K) between the control unit (R) and the control electronics (A) for the purpose of providing a secure electrical separation. To make use of a transformer (U) possible, a non-zero frequency encoding, for example a Manchester encoding, is carried out. Alternatively, an Ethernet physics can be used to provide a suitable communication interface. The transformer electrically insulates the two communication paths from each other that are provided in an Ethernet physics and preferably has little coupling capacity and a low attenuation factor.

Abstract: A wide voltage converter includes a power-supply-side converter unit, n load-side converter units, and a step-up/step-down converter device having n transformers. The step-up/step-down converter device electrically connects the power-supply-side converter unit to the n load-side converter units. The wide-voltage-range converter is capable of operating without derating with n specified output voltages, which can be predetermined independent from one another, and reliably inhibits restart.

Abstract: A wide-voltage-range converter with a power-supply-side converter unit and a load-side converter unit includes a step-up converter electrically connecting the DC voltage sides of the power-supply-side converter unit and the load-side converter unit, respectively. The wide-voltage-range converter further includes a bidirectional switch and a turn-off semiconductor switch as converter unit valves in each phase (R, S, T) of the power-supply-side converter unit. The power-supply-side converter unit also includes a filter on the AC voltage side, whereas the load-side converter unit includes a DC voltage capacitor on the DC voltage side. The wide-voltage-range converter operates at a specified output voltage without derating.

Abstract: The invention relates to a method for preparing a data stream and for transmitting it via transmitters. In order to permit use of a transmitter, the data stream is first subjected to non-zero frequency encoding, for example by Manchester encoding. For a synchronous transmission (FIG) two data streams have to be transmitted, but not in a bi-directional manner. The data signal is initially not average-free. To make transmission with a transmitter all the same possible, the signal is first for example EXOR-linked with the clock signal. The two signals are then both transmitted (the clock signal is EXOR-linked with 0 to avoid different run times) and the original data stream is recovered by again EXOR-linking the two signals.

Abstract: A control arrangement according to an example embodiment of the present invention by means of which it is not only possible to minimize the harmonic content when energy is fed into/recovered from the three-phase network into a variable voltage link, but which also allows corresponding switching losses to be minimized. Furthermore, the control arrangement is also robust with respect to failure of at least one network phase, and is robust with respect to phase fluctuations. This is achieved in that not only digital angular function values whose phases are correct but which are phase-shifted equidistantly with respect to one another are stored in one or more function memory elements, but also associated digital signals which represent respective mathematical signs of these angular function values.

Abstract: A power-line filter for operation with a converter is provided having a regulated voltage source and sinusoidal phase currents, with the power-line filter helping to eliminate interference voltages particularly in the frequency range from 2 kHz to 150 kHz, which are normally not taken into account. The leakage currents to ground, in this context, can be minimized to the point that it is possible to operate the converter in an (AC/DC sensitive) Interference Filter (IF) protective circuit-breaker.

Abstract: A method and a circuit arrangement for shaping any actual a.c. voltage characteristic into any reference a.c. voltage characteristic are described, which store the excess power in voltage overshoots in the form of a current in a current storage device using power electronic switching elements, and thus they compensate for the power deficiency when there is a voltage shortfall. The power electronic switching elements are driven by a digital automatic state machine through appropriate control pulses so that there is no fixed switching rate. The preferred field of application is for active filtering of the voltage of an electric three-phase or a.c. power supply system.