Abstract: Various embodiments of the teachings herein include a DC network comprising: an electrical conductor; a switching unit arranged at one end of the conductor to break the electrical connection via the conductor, the switching unit including a controllable power semiconductor connected in series in the current path of the conductor; wherein the conductor includes a first section and a second section starting from the switching unit with a connection point between the first section and the second section; a first overvoltage protection apparatus connected between the connecting point and a second pole of the DC network; and a second overvoltage protection apparatus connected between that end of the second section remote from the switching unit and the second pole. The overvoltage protection apparatuses each have a capacitor.

Abstract: A method of mechanically securing a first object including a thermoplastic material in a solid state to a second object with a generally flat sheet portion, with a perforation of the sheet portion, and with the sheet portion having an edge along the perforation is provided, wherein the first object is positioned relative to the second object so that the edge is in contact with the thermoplastic material and wherein mechanical vibration energy is coupled into the assembly including the first and second objects until a flow portion of the thermoplastic material due to friction heat generated between the edge and the thermoplastic material becomes flowable and flows around the edge to at least partially embed the edge in the thermoplastic material. After the mechanical vibration stops, the thermoplastic material is caused to re-solidify, whereby the re-solidified thermoplastic material at least partially embedding the edge anchors the first object in the second object.

Abstract: Various embodiments of the teachings herein include a DC network comprising: an electrical conductor; a switching unit arranged at one end of the conductor to break the electrical connection via the conductor, the switching unit including a controllable power semiconductor connected in series in the current path of the conductor; wherein the conductor includes a first section and a second section starting from the switching unit with a connection point between the first section and the second section; a first overvoltage protection apparatus connected between the connecting point and a second pole of the DC network; and a second overvoltage protection apparatus connected between that end of the second section remote from the switching unit and the second pole. The overvoltage protection apparatuses each have a capacitor.

Abstract: Safety system (100) for use with a personal protective equipment for working in great heights comprising: wireless communication means configured to provide a communication with a rescue coordination center (170); sensor means for providing sensor data comprising at least one acceleration sensor and at least one orientation sensor; evaluation and notification means configured to determine a fall event and/or a loss of consciousness event based on the sensor data and to notify the rescue coordination center (170) via the wireless communication means by sending an alert event message.

Abstract: A battery charging system for cablelessly charging a battery includes a primary-side charging unit as a primary side, a secondary-side charging unit as a secondary side, a transformer having a primary-side winding as part of the primary side and a secondary-side winding as part of the secondary side, one controller on the primary side and one controller on the secondary side, one voltage sensor on the primary side and one voltage sensor on the secondary side, one current sensor on the primary side and one current sensor on the secondary side, one communication unit on the primary side and one communication unit on the secondary side, and one direct current converter provided on the primary side only.

Abstract: A battery charging system for cablelessly charging a battery includes a primary-side charging unit as a primary side, a secondary-side charging unit as a secondary side, a transformer having a primary-side winding as part of the primary side and a secondary-side winding as part of the secondary side, one controller on the primary side and one controller on the secondary side, one voltage sensor on the primary side and one voltage sensor on the secondary side, one current sensor on the primary side and one current sensor on the secondary side, one communication unit on the primary side and one communication unit on the secondary side, and one direct current converter provided on the primary side only.

Abstract: A switch is disclosed, in particular a circuit breaker for low voltages. In at least one embodiment, the switch includes a conductor, an electronic tripping unit (ETU) which trips the switch when a current limit value is exceeded, the power supply of the electronic tripping unit including current transformers, with a first winding which is connected to the electronic tripping unit (ETU) forming the secondary side of the current transformer and the conductor forming the first primary side of the current transformer, the conductor supplying electrical power to the current transformer when the current varies over time. In order to ensure power is supplied to the tripping unit (ETU) even in modes of operation in which too little power is provided by the first winding, for example in the case of a direct current, small alternating currents, a pulsed direct current etc.

Abstract: A power supply includes a storage capacitor which can be charged with a rectified input current by means of a current-limiting element which is controlled by a drive circuit. The direct-axis component of current and the direct-axis component of voltage on the current limiting element are supplied to the control circuit as input values and the current limiting element is controlled in such a way that it is not subjected to more than a predetermined maximum power loss.