A semiconductor power module including an insulating substrate having one surface and another surface, an output side terminal arranged at a one surface side of the insulating substrate, a first power supply terminal arranged at the one surface side of the insulating substrate, a second power supply terminal to which a voltage of a magnitude different from a voltage applied to the first power supply terminal is to be applied, and arranged at another surface side of the insulating substrate so as to face the first power supply terminal across the insulating substrate, a first switching device arranged at the one surface side of the insulating substrate and electrically connected to the output side terminal and the first power supply terminal, and a second switching device arranged at the one surface side of the insulating substrate and electrically connected to the output side terminal and the second power supply terminal.

A method for controlling a resonance type power converter including a first resonance circuit (L.sub.0, C.sub.0) and a shunt circuit (3), which converts and outputs the power of the DC power supply, shunting a current flowing into a first capacitor (C.sub.S) by controlling a second switching element (S.sub.2) during a predetermined period within turn-off period of a first switching element (S.sub.1), the first capacitor connected in parallel to the first switching element (S.sub.1), the second switching element (S.sub.2) included in the shunt circuit (3), and the first switching element (S.sub.1) operated in response to the resonance of the first resonance circuit (L.sub.0, C.sub.0).

An inverter includes a direct-current conversion unit, a busbar unit, and an inversion unit. The direct-current conversion unit includes a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first direct current DC-to-DC module, a second DC-to-DC module, a first on/off control device, a second on/off control device, a first switch, and a second switch. The first positive input terminal and the first negative input terminal are configured to connect a first photovoltaic string, the second positive input terminal and the second negative input terminal are configured to connect a second photovoltaic string, and a connection relationship of a circuit in the direct-current conversion unit can be changed based on combinations of turning-on or turning-off of the first switch and the second switch.

An inverter includes a direct-current conversion unit, a busbar unit, and an inversion unit. The direct-current conversion unit includes a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first direct current DC-to-DC module, a second DC-to-DC module, a first on/off control device, a second on/off control device, a first switch, and a second switch. The first positive input terminal and the first negative input terminal are configured to connect a first photovoltaic string, the second positive input terminal and the second negative input terminal are configured to connect a second photovoltaic string, and a connection relationship of a circuit in the direct-current conversion unit can be changed based on combinations of turning-on or turning-off of the first switch and the second switch.

A resonant inverter has a switch network from which a phase signal is provided representing the phase of the switching signal. A resonant tank circuit is coupled to the first switch network output and provides a feedback signal comprising a resonance voltage across a circuit element of the resonant tank circuit. A reference current to be drawn from the input node is set and a reference phase is set based on the reference current. The switching signal for the switch network is controlled based on a phase difference between the resonance voltage and the phase signal, and based on the reference phase. This resonant inverter employs a phase modulation scheme as the control scheme for the switch network of a resonant inverter. This approach is suited for high and very high frequency operation of resonant converters, for example up to tens of MHz.

An electric power supply apparatus for a user device, in particular for steel industry applications, that includes means for connection to an electricity grid for supplying a mains voltage and a mains current, and at least one electric line for connecting the electricity grid to the user device, wherein the electric line includes one or more electric apparatuses located between the electricity grid and the user device.

An electric high-voltage device includes a fluid-tight housing, a high-voltage component arranged in the housing, and an insulating liquid in the housing in order to electrically insulate the high-voltage component. The high-voltage component is a passive current collector which is configured to at least temporarily conduct a current of at least 1 kA. There is also described a power converter assembly with the high-voltage device.

A first offset correction and a second offset correction are switched between in a cycle T.sub.c shorter than an electrical angle cycle of an alternating current rotating machine, the first offset correction is such that a first shift amount is fixed in such a way as to obtain an applied voltage such that at least n-2 phases among phase currents of the alternating current rotating machine can be detected, and the applied voltage is calculated by the first shift amount being subtracted equally from all voltage commands, and the second offset correction is such that a second shift amount is fixed in such a way that a sign of an average value in an electrical angle cycle is reversed with respect to that of an average value in an electrical angle cycle of the first shift amount, and the applied voltage is calculated by the second shift amount being subtracted equally from all the voltage commands.

A first offset correction and a second offset correction are switched between in a cycle T.sub.c shorter than an electrical angle cycle of an alternating current rotating machine, the first offset correction is such that a first shift amount is fixed in such a way as to obtain an applied voltage such that at least n-2 phases among phase currents of the alternating current rotating machine can be detected, and the applied voltage is calculated by the first shift amount being subtracted equally from all voltage commands, and the second offset correction is such that a second shift amount is fixed in such a way that a sign of an average value in an electrical angle cycle is reversed with respect to that of an average value in an electrical angle cycle of the first shift amount, and the applied voltage is calculated by the second shift amount being subtracted equally from all the voltage commands.

A propulsive electric motor set for aircraft includes an electrical energy source and an electric motor provided with a drive shaft on which is mounted a propeller. The electric motor includes a first set of windings linked to the electrical energy source to provide a rotational drive function for the drive shaft. The electric motor further includes a second set of windings which, when the drive shaft is driven in rotation by an electric powering of the first set of windings, provides an electric generation function configured to supply non-propulsive loads of the aircraft. Thus, the non-propulsive loads of the aircraft can be electrically powered without any overload compromising the aerodynamics of the aircraft.