Abstract: The disclosure concerns a totem pole PFC with a surge protection circuit, wherein the totem pole PFC comprises at least one bypass-diode branch with at least two bypass-diodes, at least one switch branch with at least two switches, at least one polarity changer branch with at least two switches, an input bridge connecting the switch branch(es) with an input voltage source, and at least one bypass branch connecting the input bridge in parallel with the bypass-diodes of the bypass-diode branch(es). The surge protection circuit comprises at least one current sensor configured to detect a current flowing through at least one of the bypass-diodes of the bypass-diode branch(es), and a control unit configured to receive a detected current value from the current sensor(s) and to switch at least one switch of the totem pole PFC at least in dependence on the detected current value.

Abstract: According to the invention, a current measurement circuit for providing a measurement signal for a controller for controlling a switching of power switches of a power converter comprises a first current sensing circuit for sensing a first bidirectional current representative of a current through a first power switch of the power converter. The first current sensing circuit is being adapted to provide a first sensing signal indicative of the first bidirectional current. The current measurement circuit further comprises a second current sensing circuit for sensing a second bidirectional current representative of a current through a second power switch of the power converter. The second current sensing circuit is adapted to provide a second sensing signal indicative of the second bidirectional current.

Abstract: According to the invention, a current measurement circuit for providing a measurement signal for a controller for controlling a switching of power switches of a power converter comprises a first current sensing circuit for sensing a first bidirectional current representative of a current through a first power switch of the power converter. The first current sensing circuit is being adapted to provide a first sensing signal indicative of the first bidirectional current. The current measurement circuit further comprises a second current sensing circuit for sensing a second bidirectional current representative of a current through a second power switch of the power converter. The second current sensing circuit is adapted to provide a second sensing signal indicative of the second bidirectional current.

Abstract: A device for cleaning the inner walls of vulcanizing molds that are divided into upper and lower partial molds by means of a blasting device/nozzle and a manipulating device, with the blasting device and the manipulating device being accommodated and encapsulated in an isolation hood that is provided with an adapter ring, and with the isolation hood being suspended on a movable boom and connectable to the outer circumference of a partial mold by means of the adapter ring.

Abstract: A solid rubber tire comprised of rubber or plastic having elastomeric properties has a bottom layer and a tread portion connected to the bottom layer. A reinforcement structure for the bottom layer is provided in the form of a textile reinforcement element or a metal reinforcement element. The reinforcement structure is a wound overlay having at least one reinforcement layer which is produced by winding the reinforcement element in a plurality of windings so as to extend over at least 20% of the axial width of the bottom layer. The reinforcement element can be a cord, wire or cable. The reinforcement element may also be a cord material strip having individual reinforcement members arranged in parallel. The reinforcement members can be textile or metal reinforcement members in the form of cord, wire or cable. A method for producing the solid rubber tires is disclosed.