Abstract: A power supply comprises at least one input to couple the power supply to a power source. The power supply also comprises at least one switched-mode power circuit configured to extract electrical energy from the power source, the electrical energy to be transferred to a load. The power supply additionally comprises at least one control module coupled between the at least one input and the at least one switched-mode power circuit. The control module is configured to control operation of the switched-mode power circuit to regulate a voltage-to-current ratio at the at least one input of the power supply.

Abstract: Pipes of a weldable polymer material are welded with a muff of a weldable polymer material. The method includes placing the muff with an overlap over the ends of the pipes, welding the muff to the ends of the pipes through placement of an electrically conducting band that is permeable to molten plastic between the pipe and the muff, connecting a power supply to the band through feed cables, and supplying an electrical current in order to heat the band and the surrounding polymer material such that they melt together around the band in order to form a weld. The temperature of the weld is calculated through adding the initial ambient temperature of the weld and the increase in temperature of the band.

Abstract: A power supply comprises at least one input to couple the power supply to a power source. The power supply also comprises at least one switched-mode power circuit configured to extract electrical energy from the power source, the electrical energy to be transferred to a load. The power supply additionally comprises at least one control module coupled between the at least one input and the at least one switched-mode power circuit. The control module is configured to control operation of the switched-mode power circuit to regulate a voltage-to-current ratio at the at least one input of the power supply.

Abstract: A method for installation and repair of insulated piping includes placing a sleeve coupling, made of a weldable polymer material incorporating a slit that runs lengthwise along the piping, and whose length exceeds the distance between the outer pipes' ends, over the exposed section of the inner pipe so as to overlap the ends of the outer pipes, and welding the sleeve coupling to the outer pipe at the ends of the outer pipes, by placing an electrically conductive band between the outer pipe and the sleeve coupling, ensuring that free ends of the band project upward through the slit. A power converter which has a quasi-resonant converter is employed to produce the electric current that is to be connected to the band.

Abstract: Pipes of a weldable polymer material are welded with a muff of a weldable polymer material. The method includes placing the muff with an overlap over the ends of the pipes, welding the muff to the ends of the pipes through placement of an electrically conducting band that is permeable to molten plastic between the pipe and the muff, connecting a power supply to the band through feed cables, and supplying an electrical current in order to heat the band and the surrounding polymer material such that they melt together around the band in order to form a weld. The temperature of the weld is calculated through adding the initial ambient temperature of the weld and the increase in temperature of the band.

Abstract: The present invention relates to a method for the installation and repair of insulated piping, wherein the insulated piping comprises an outer pipe 1, 1.1 or 1.2 made of a weldable polymer material that encases an inner pipe 2, 2.1 or 2.2 embedded in an insulating layer 4, and wherein the inner pipe 2, 2.1 and 2.2 has been substantially exposed over a section A between the ends 1 a and 1 b of the two outer pipes. The method comprises placing of a sleeve coupling 7, made of a weldable polymer material incorporating a slit 8 that runs lengthwise along the piping, and whose length 5 exceeds the distance A between the outer pipes' ends 1 a and 1 b, over the exposed section A of the inner pipe 2, or 2.1 and 2.2, and with overlapping of the outer pipes' ends 1 a and 1 b; welding the sleeve coupling 7 to the outer pipes 1, or 1.1 and 1.2, the outer pipes' ends 1 a and 1 b, by placing an electrically conductive band 9 that is pervious to molten plastic between the outer pipe 1, or 1.1 and 1.

Abstract: The present invention relates to an interleaved power factor (PFC) correction boost converter. In order to enable the interleaved PFC boost converter circuit to operate over a wide range of input voltages and frequencies the circuit comprises: A first converter (A); A second converter (B) configured to operate in conjunction with the first converter; and A timing circuit (X) connected to both the first converter (A) and the second converter (B), wherein timing information is shared between the first converter and the second converter.

Abstract: The present invention refers to a method for controlling a magnetron filament current. The control is provided by detecting the dynamic impedance or a noise level of the magnetron and by controlling the magnetron filament current based thereupon.