Abstract: A circuit arrangement for operating an electrical machine having an inductive component. The circuit arrangement includes an electrical switch (TR1 through TR6) that applies a pulse-shaped signal (S1 through S4) to the electrical machine. The free-running circuit also includes an electrical switch (TR1 through TR6). A comparator (15) is provided which compares the free-running current flowing in the free-running circuit with a predefined threshold value and, if the current drops below the threshold value, provides a switching signal (S3A) that is used to deactivate the switch (TR1 through TR6) in the free-running circuit. The circuit arrangement reduces both the electrical power loss in the circuit arrangement and the mechanical power loss in the electrical machine.

Abstract: The invention relates to a power supply unit or battery charging device (1). While of compact type, the device is to dissipate to the environment the heat generated during operation and, on the other hand, is to be extremely handy. There is proposed to provide cooling fins (4) on the housing (2) of the device, while the cooling fins (2) are arranged so that the cooling fin interstices are suitable for locking a cable (5) of the device.

Abstract: A device for establishing an electrical plug-in connection to a socket, which device has a housing body and at least one plug pin for plugging into the socket, which plug pin, in a first position, projects from the housing body, is improved so that the whole device needs less space. For this purpose, it is provided that the plug pin can be moved into a second retracted position in which it projects less far from the housing body. For example, in a plug-in power supply the contact pins can be arranged in a folding manner, so that the whole device needs less space.

Abstract: The invention relates to a power supply unit or battery charging device (1). While of compact type, the device is to dissipate to the environment the heat generated during operation and, on the other hand, is to be extremely handy. There is proposed to provide cooling fins (4) on the housing (2) of the device, while the cooling fins (2) are arranged so that the cooling fin interstices are suitable for locking a cable (5) of the device.