Aspects of the invention overcome a monolithic approach to conventional low-frequency LPTs by using a high-frequency solid-state alternating current ac/ac modular powerconversion approach. Embodiments of the invention enable the ability to incorporate new technologies without in all cases redoing a LPT design from scratch. Furthermore, given that LPTs are for the long term, aspects of the invention ensure that they are durable, efficient, and fault tolerant with overloading capability.

Systems, methods and apparatus for wireless charging are disclosed. A charging device has a resonant circuit that includes a transmitting coil. The charging device also has a driver circuit configured to power the resonant circuit, a pulse width modulator and a controller configured to provide a control signal to the pulse width modulator the control signal configuring the pulse width to provide a modulated drive signal to the driver circuit. The pulse width modulator is configured to provide the modulated drive signal to the resonant circuit. The resonant circuit is configured to operate as a low-pass filter that blocks frequency components of the modulated drive signal that correspond to the reference signal. The driver circuit is configured to use the modulated drive signal to produce a charging current in the resonant circuit. The charging current causes power to be wirelessly transferred to a receiving device through the transmitting coil.

Disclosed are a power conversion device, an electric range including same, and a control method therefor. The electric range of the present invention comprises: a plate; a working coil; an interface unit; a voltage providing unit for providing a rectified voltage to the working coil; a first switching element; a second switching element connected in parallel with the first switching element; and a control unit, wherein the control unit determines a driving signal for driving at least one of the first switching element and the second switching element, according to the temperatures of the first switching element and the second switching element, and outputs same to the first switching element and the second switching element, and when the rectified voltage is greater than or equal to a predetermined level, the control unit provides the first switching element and the second switching element with driving signals for driving the first switching element and the second switching element, respectively, and when the rectified voltage is less than the level, the control unit transmits a driving signal to a switching element having a lower temperature among the first switching element and the second switching element, and provides an off control signal to the switching element having a higher temperature.

An induction heating device of one embodiment includes a working coil, an inverter including a first switch and a second switch and supplying a resonance current to the working coil, a phase sensing circuit outputting a pulse signal that indicates a phase difference between the resonance current and a switching voltage of the second switch, and a controller calculating a final phase difference between the resonance current and the switching voltage of the second switch, based on the pulse signal, and adjusting an output power value of the working coil, based on the final phase difference.

A system for driving four-quadrant (4Q) switches of a power converter is provided herein and comprises a transformer driver module, a first gate driver module and a second gate driver module coupled to the transformer driver module via a first isolation transformer and a second isolation transformer, respectively, for receiving both switch signal information and power, and a first bidirectional switch and a second bidirectional switch coupled to the first gate driver module and the second gate driver module and to one another for driving the first bidirectional switch and the second bidirectional switch based on the switch signal information.

A method for controlling switching of an electrical system comprising having at least one frequency-controlled switch arm, includes the following steps: closing a first top or bottom switch, implementing a predetermined downtime and opening a second switch, for a period corresponding to the control frequency, and then: opening the first switch, comparing the voltage measured at the midpoint with a voltage threshold, determining a second instant t2 at which the voltage measured at the midpoint crosses the voltage threshold, closing the second switch at the second instant t2, calculating a downtime DT adjusted according to a formula which is a function of the control frequency Fsw, a first instant t1 and a second instant t2, the adjusted downtime being implemented as of the subsequent switching.

A switched mode power converter is provided herein and comprises a cycloconverter comprising a plurality of switches, wherein each switch of the plurality of switches is a native four quadrant bi-directional switch with a common drift region configured to allow current flow in a first direction from a first source terminal to second source terminal and in a second direction from the second source terminal to the first direction.

An inductive power outlet is disclosed. The inductive power outlet has a primary inductor, for wirelessly powering an inductive power receiver. The inductive power outlet has a secondary inductor. The primary inductor and the secondary inductor form a resonant frequency. The inductive power outlet comprises a driver generating an oscillating voltage to the primary coil at a frequency higher than the resonant frequency. The inductive power outlet comprises a signal detector. The signal detector comprises a peak detector configured to detect voltage peaks across the primary inductor or current peaks of a current supplied to the primary inductor. The signal detector comprises a processor configured to determine a frequency of either the voltage peaks or the current peaks.

Examples described herein may include medical devices and electrosurgical generators with resonant isolated transformers to perform filtering and gain functions. An example electrosurgical generator includes a radio frequency (RF) inverter stage configured to receive an input signal and, in response to control feedback signals, to provide an output signal that provides power to a load. The RF inverter stage includes a resonant isolated transformer configured to receive the input signal and to provide gain and filtering adjustments to the input signal to provide the output signal.

An inverter circuit receives an AC input signal and uses at least two bidirectional switches between the input terminals and a junction node to perform the electrical inversion function. A resonant circuit is formed by a primary side inductor between the junction node and a second node and a capacitor arrangement between the second node and the input terminals.