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.

A phase-shifted full-bridge converter and a control method thereof are disclosed. The proposed control method of a phase-shifted full-bridge converter, wherein the phase-shifted full-bridge converter includes a full-bridge switching circuit having a first and a second output terminals, a main transformer having a primary winding and coupled to the switching circuit, and an autotransformer having a primary winding and coupled to the main transformer, includes providing an induced common current flowing through the primary winding of the autotransformer; and causing the induced common current being reflected to the primary winding of the main transformer to cause a primary side current flowing through the primary winding of the main transformer to increase both slopes of a valid duty cycle and a dead-zone period such that the primary side current has a relatively lower transition level and a relatively shorter transition time.

A control apparatus is provided for controlling energization of a multiple-winding rotating electric machine. The control apparatus includes inverters respectively corresponding to winding sets of the machine and a controller. The unit of a group of components provided for the energization of one winding set is defined as a system. The controller is configured to: (1) offset switching timings of switch elements of each of the inverters from those of switch elements of any other of the inverters; and (2) determine switching patterns of systems, based on an evaluation function of common-mode voltages of the systems, so as to minimize electro-magnetic interference due to the common-mode voltages. In each of the systems, the common-mode voltage of the system is defined as the difference in electric potential between a neutral point in voltage of a DC power source and a neutral point of the winding set corresponding to the 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.

A phase-shifted full-bridge converter and a control method thereof are disclosed. The proposed control method of a phase-shifted full-bridge converter, wherein the phase-shifted full-bridge converter includes a full-bridge switching circuit having a first and a second output terminals, a main transformer having a primary winding and coupled to the switching circuit, and an autotransformer having a primary winding and coupled to the main transformer, includes providing an induced common current flowing through the primary winding of the autotransformer; and causing the induced common current being reflected to the primary winding of the main transformer to cause a primary side current flowing through the primary winding of the main transformer to increase both slopes of a valid duty cycle and a dead-zone period such that the primary side current has a relatively lower transition level and a relatively shorter transition time.

The invention relates to a method for operating an electric synchronous machine, having the steps of: —generating centered pulse-width-modulated switching signals for switching elements (T1 . . . T6) of half-bridges, wherein two switching elements (T1 . . . T6) are connected to a respective half-bridge in each case; second switching elements (T4 . . . T6) of each half-bridge are actuated in a complementary manner to the first switching elements (T1 . . . T3) of each half-bridge if a sufficient minimum measurement duration (T.sub.M) is thereby provided during which the switching signals of switching elements (T1 . . . T6) of two half-bridges lie at different potentials; —otherwise: —generating pulse-width-modulated switching signals for the switching elements (T1 . . . T6) of the half-bridges, said switching signals deviating from the center at least to such a degree that a sufficient minimum measurement duration (T.sub.M) is provided, wherein —the switching signals of the switching elements (T1 . . . T6) are designed such that temporal changes corresponding to the minimum measurement duration (TM) in the switching signals of the switching elements (T1 . . . T6) are prevented; and —carrying out a 1-shunt current measurement within the provided minimum measurement duration T.sub.M).

To disclose several zero-voltage-switching (ZVS) power inversion circuits, a modified pulse-width modulation control scheme is employed. It includes two driver-signal pairs. Each pair has a near 50% duty ratio driver signal and a pulse-width modulation driver signal. Because the combination timing waveform of the two driver signals of each pair resembles to a letter T, the control scheme is thus briefly named as double T (TT) control. In addition to achieving zero-voltage switching performance for high frequency operation, the disclosed power inversion circuits can alleviate the potential shoot-through problem existed in phase-shift control full-bridge power inversion circuits. Consequently, reliability performance can be improved.

A power control method for wireless charging and an electronic device therefor are provided. The electronic device, includes a coil, an inverter including gate inputs which are electrically connected to the coil, and at least one processor. The at least one processor is configured to control the gate inputs of the inverter in an anti symmetric manner to generate an output power, receive an output power reduction request from an external electronic device, based on receiving the output power reduction request, determine whether a ratio of ON-operations to OFF-operation of the gate inputs of the inverter is less than or equal to a designated ratio, and based on the ratio of ON-operations to OFF-operations of the gate inputs of the inverter being less than or equal to the designated ratio, modulate a phase of a voltage input into the gate inputs of the inverter to generate an output power.

A resonant inverter apparatus supplies a high AC voltage to a discharge load. In this apparatus, an inverter circuit converts a DC voltage to an AC voltage using a plurality of switching elements. A transformer steps up the AC voltage and generates a high AC voltage. A DC voltage detecting unit detects a value of a DC voltage supplied to the inverter circuit. A control unit generates a driving pulse for performing on/off switching of the switching elements. The switching elements include first and second switching elements. The control unit performs phase angle control of the driving pulse. In response to the detected value of the DC voltage being greater than a reference value, the control unit sets a switching phase angle of the second switching element relative to the first switching element serving as reference, based on the magnitude of the valued of the DC voltage.

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.