A system and method are provided for a feed-forward control of an inverter to reduce, and potentially minimize, a DC link capacitor of a wireless power transfer system. The feed-forward control may be utilized to reduce the capacitance of the DC link capacitor in a single-phase series-series compensated WPT system.

In this power conversion device, a phase deviation of an output voltage due to a phase shift control is eliminated. The power conversion device according to the present invention converts DC voltage to AC voltage by phase-shift controlling the switching elements of a full bridge inverter. In place of a conventional method in which only one of the first and second legs of the full bridge inverter is phase-shifted, both legs are phase-shifted in opposite directions to each other to control an overlap angle at which the switching elements of the first and second legs of the full bridge are simultaneously brought into an on-state. The variation of the center phase of the overlap angle is suppressed by phase-shifting the first and second legs in the opposite directions to each other.

In this power conversion device, a phase deviation of an output voltage due to a phase shift control is eliminated. The power conversion device according to the present invention converts DC voltage to AC voltage by phase-shift controlling the switching elements of a full bridge inverter. In place of a conventional method in which only one of the first and second legs of the full bridge inverter is phase-shifted, both legs are phase-shifted in opposite directions to each other to control an overlap angle at which the switching elements of the first and second legs of the full bridge are simultaneously brought into an on-state. The variation of the center phase of the overlap angle is suppressed by phase-shifting the first and second legs in the opposite directions to each other.

A method of operating a motor includes providing an electric system coupled with the motor, the electric system including parallel inverter legs; subjecting the motor to a first interleaving angle when the electric system is under a first condition; and subjecting the motor to a second interleaving angle different from the first interleaving angle when the electric system is under a second condition; wherein the steps of subjecting the motor to the first interleaving angle and subjecting the motor to the second interleaving angle occur within continuous operation of the electric system and the motor.

This application describes a variety of approaches for generating high voltage sinusoidal signals whose output voltage can be adjusted rapidly, without introducing high-frequency artifacts on the output. When these approaches are used, stronger electric fields can be applied to the tumor for a higher percentage of time, which can increase the efficacy of TTFields therapy. In some embodiments, this is accomplished by preventing adjustments to a DC power source during times when the output of that DC power source is powering the output signal. In some embodiments, this is accomplished by synchronizing the operation of an AC voltage generator and an electronic switch that is connected to the output of the AC voltage generator.

An inductive power receiver 3 including at least two switches S.sub.1, S.sub.2 connected across a resonant circuit 802, the resonant circuit including an inductance and a capacitance, wherein a first switch S.sub.1 of the at least two switches is configured to switch into a first state based on a first event dependent on a receiver variable; and the first switch is configured to switch to a second state based on a second event independent of a receiver variable.

This application describes a variety of approaches for generating high voltage sinusoidal signals whose output voltage can be adjusted rapidly, without introducing high-frequency artifacts on the output. When these approaches are used, stronger electric fields can be applied to the tumor for a higher percentage of time, which can increase the efficacy of TTFields therapy. In some embodiments, this is accomplished by preventing adjustments to a DC power source during times when the output of that DC power source is powering the output signal. In some embodiments, this is accomplished by synchronizing the operation of an AC voltage generator and an electronic switch that is connected to the output of the AC voltage generator.

A resonant power converter. An embodiment with a fullbridge converter is disclosed, controlled with feedback or feedforward technique. Switching schemes are either based on a sort of look up table or on measurement of current or voltage. Dead time may be adjusted. Timing may be such, that in the respective diagonal pairs of the converter, one switch is switched on for a different time (different pulse width) than the other. Use in a relative high power environment for about 20 KW in e.g. an X-Ray or Computer Tompgrapy System.

An intermediate circuit current of a power converter is determined as precisely as possible in a simple and inexpensive manner. The intermediate circuit current is determined as a function of a detection of the measured output voltages and output currents of the individual phases.

Switching control of an inverter is performed such that rising and falling of a terminal voltage of U phase including upper and lower arm switching elements are calculated, and the calculated rising of the terminal voltage of U phase and falling of a terminal voltage of V phase or W phase or the calculated falling of the terminal voltage of U phase and rising of the terminal voltage of V phase or W phase are synchronized with each other.