Abstract: The invention relates to a method for operating a switched mode power supply as an isolating transformer. According to said method, magnetic energy is stored in the core of a transformer during a storage stage via a primary coil that is connected to an intermediate circuit current and the stored magnetic energy is delivered to a load in a subsequent discharge phase, for the most part by means of a secondary coil, a small part of said magnetic energy being discharged on the primary side. The energy that is discharged on the primary side charges a capacitor in such a way that the capacitor current is always held above the secondary current multiplied by the transmittance ratio of the transformer.

Abstract: A circuit arrangement for two serially connected semiconductor switches connected to a voltage supply is provided. Between the semiconductor switches a primary winding of a transformer is connected. A first diode is connected on an anode side to a potential of the voltage supply at a source terminal of the second semiconductor switch and on a cathode side to a first connection terminal facing the first semiconductor switch on the primary winding. A second diode is connected on the cathode side to the potential of the voltage supply at a drain terminal of the first semiconductor switch and on the anode side to a second connection terminal facing the second semiconductor switch on the primary winding. A first secondary winding of the transformer is provided, connected in series between the first diode and the first connection terminal, and a second secondary winding, connected in series between the second diode and the second connection terminal.

Abstract: In a process for operating an air-cooled mains supply unit for industrial application, temperatures influenced by outer heat sources and by heat sources arranged in the mains supply unit are measured by thermo-elements and reported to a control system. Temperatures measured by at least two thermo-elements arranged at different measurement points are reported to the control system, and the measured temperatures are compared with temperature patterns. The comparison with known temperature patterns makes it possible to sense the totality of the thermal conditions continuously and to derive therefrom ratings for the control system.

Abstract: A light grid detects objects in a monitored area. The grid includes a number of transmitters that emit light rays pulses. A number of receivers, corresponding to the number of transmitters, receive the light rays. Respectively one transmitter is assigned to one receiver to define a light axis. With a clear monitoring area, the light rays emitted by the transmitter impinge on the corresponding receiver. The transmitters and the corresponding receivers are activated cyclically and individually, one after another. An evaluation unit generates a switching signal in dependence on the signals received at the receivers. A control unit coupled between the receivers and the evaluation unit eliminates interfering light shares in the signals received at the receivers. The control unit is deactivated during time intervals in which the transmitters emit transmitting pulses.

Abstract: An electrical connector element for connection of a conductor to a circuit board, having a housing, at least one clamp connector for the conductor and at least two connector pins for preferably soldered connection to the circuit board, is disclosed. The housing has at least one separating element made from insulating material, projecting from the lower side, facing away from the circuit board in the assembled position, at least partly arranged between the connector pins and extending through the circuit board in the assembled position, in order to permit the connector pins of the electrical connector element to be arranged closer together.

Abstract: An electrical connector element for connection of a conductor to a circuit board, having a housing, at least one clamp connector for the conductor and at least two connector pins for preferably soldered connection to the circuit board, is disclosed. The housing has at least one separating element made from insulating material, projecting from the lower side, facing away from the circuit board in the assembled position, at least partly arranged between the connector pins and extending through the circuit board in the assembled position, in order to permit the connector pins of the electrical connector element to be arranged closer together.

Abstract: A circuit arrangement for two serially connected semiconductor switches connected to a voltage supply is provided. Between the semiconductor switches a primary winding of a transformer is connected. A first diode is connected on an anode side to a potential of the voltage supply at a source terminal of the second semiconductor switch and on a cathode side to a first connection terminal facing the first semiconductor switch on the primary winding. A second diode is connected on the cathode side to the potential of the voltage supply at a drain terminal of the first semiconductor switch and on the anode side to a second connection terminal facing the second semiconductor switch on the primary winding. A first secondary winding of the transformer is provided, connected in series between the first diode and the first connection terminal, and a second secondary winding, connected in series between the second diode and the second connection terminal.

Abstract: A switching converter in which an input voltage can be switched by means of at least one controlled switch to at least one primary winding of a transformer, with a control circuit for controlling the switch, to which control circuit a regulating signal in the sense of regulating at least one output voltage is sent, wherein the power supply of the control circuit takes place via the forward voltage of an auxiliary winding of the transformer, a rectifier, a capacitor and a series regulator, on the one hand, and, on the other hand, starting from the input voltage, via a current path and a storage capacitor, and the off-state voltage of an auxiliary winding, which is rectified by means of a rectifier, is additionally sent to the control circuit for power supply, wherein the rectified off-state voltage is used during the operation for supplying the control circuit as long as it has a sufficient voltage level.