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: An electric power supply system includes a rectifier with an input connected to a power line and a DC output connected to a DC/DC converter. Two buffer capacitors are connected across the input and output, respectively, of the DC/DC converter. The output of the rectifier includes a plurality of diodes. An electronically controllable switch is electrically connected in parallel with a corresponding diode of the rectifier. A controller receives an input signal from a phase voltage of the power line and provides control signals to the controllable switches. The DC/DC converter is constructed symmetrically. This configuration results in a more cost-effective power supply system with an improved energy balance.

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: 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.