Abstract: A cooling arrangement for a wireless power transfer system comprising a transmitter and a receiver for receiving electrical power from a transmitter is provided. The cooling arrangement comprises a housing arrangement for enclosing a receiver of a wireless power transfer system. The housing arrangement is adapted to provide a flow path between a cooling element powered by a transmitter of a wireless power transfer system or a power source for powering the transmitter, and the receiver.

Abstract: A load independent inverter comprises a switched mode zero-voltage switching (ZVS) amplifier. The switched mode ZVS amplifier comprising: a pair of circuits comprises: at least a transistor and at least a capacitor arranged in parallel; and at least an inductor arranged in series with the transistor and capacitor. The amplifier further comprises only one ZVS inductor connected to the pair of circuits; and at least a pair of capacitors connected to the ZVS inductor and arranged in series with at least an inductor and at least a resistor.

Abstract: A load independent inverter comprises a switched mode zero-voltage switching (ZVS) amplifier. The switched mode ZVS amplifier comprising: a pair of circuits comprises: at least a transistor and at least a capacitor arranged in parallel; and at least an inductor arranged in series with the transistor and capacitor. The amplifier further comprises only one ZVS inductor connected to the pair of circuits; and at least a pair of capacitors connected to the ZVS inductor and arranged in series with at least an inductor and at least a resistor.

Abstract: An alignment device comprises a coil configured to generate an induced voltage from a magnetic field, or an electrode configured to generate an induced voltage from an electric field. The alignment device further comprises a comparator configured to compare the induced voltage to a threshold voltage and activate an indicator based on the comparison.

Abstract: A transmit resonator is provided. The transmit resonator comprises: two inductors; a switching network electrically connected to the inductors; a plurality of capacitive electrodes electrically connected to the switching network; a detector communicatively connected to the capacitive electrodes; and a controller communicatively connected to the switching network and the detector. The detector is configured to detect impedance. The controller is configured to control the switching network to control which electrodes are connected to the inductors based on the detected impedance. The inductors and electrodes are configured to resonate to generate an electric field.

Abstract: An alignment device comprises a coil configured to generate an induced voltage from a magnetic field, or an electrode configured to generate an induced voltage from an electric field. The alignment device further comprises a comparator configured to compare the induced voltage to a threshold voltage and activate an indicator based on the comparison.

Abstract: A transmit resonator is provided. The transmit resonator comprises: two inductors; a switching network electrically connected to the inductors; a plurality of capacitive electrodes electrically connected to the switching network; a detector communicatively connected to the capacitive electrodes; and a controller communicatively connected to the switching network and the detector. The detector is configured to detect impedance. The controller is configured to control the switching network to control which electrodes are connected to the inductors based on the detected impedance. The inductors and electrodes are configured to resonate to generate an electric field.

Abstract: A differential rectifier for use in a receiver for receiving wireless power via inductive coupling comprises first and second capacitors; first and second switching elements; and first and second inductors. The first capacitor and first inductor are electrically connected in series, and the second capacitor and second inductor are electrically connected in series. The first switching element is electrically connected between the first capacitor and first inductor in parallel, and the second switching element is electrically connected between the second capacitor and second inductor in parallel. The first capacitor electrically is connected to a terminal of a coil for receiving power wirelessly via inductive coupling, and the second capacitor is electrically connected to another terminal of a coil for receiving power wirelessly via inductive coupling. The first and second switching elements are electrically connected to a tap of a coil for receiving power wirelessly via inductive coupling.

Abstract: A rectifier for use in a receiver of a wireless power transfer system for receiving wireless power transferred for a transmitter of the wireless power transfer system. The rectifier comprises a field effect transistor (FET) comprising: a source terminal electrically connected to ground; a drain terminal electrically connected to a receive element of the receiver. The receive element is for extracting power from the transmitter of the wireless power transfer system. The FET further comprises a gate terminal electrically connected to the receive element. The gate terminal is driven by a gate signal in phase with an input signal received at the receive element.

Abstract: A rectifier for use in a receiver of a wireless power transfer system for receiving wireless power transferred for a transmitter of the wireless power transfer system. The rectifier comprises a field effect transistor (FET) comprising: a source terminal electrically connected to ground; a drain terminal electrically connected to a receive element of the receiver. The receive element is for extracting power from the transmitter of the wireless power transfer system. The FET further comprises a gate terminal electrically connected to the receive element. The gate terminal is driven by a gate signal in phase with an input signal received at the receive element.

Abstract: A bidirectional wireless power transfer system for transferring power comprises a power stage electrically connected to a transceiver element for an electric field and/or a magnetic field, and for extracting power from a generated electric field and/or a generated magnetic field. The power stage is for inverting an inputted power signal and for rectifying a received power signal. The system further comprises a trigger circuit for synchronizing wireless power transfer; and a clock generator for generating a clock signal.

Abstract: A transmitter comprises a multi-phase radio-frequency (RF) converter configured to output multiple sinusoidal RF power signals; and a multi-phase resonator configured to receive the multiple sinusoidal RF power signals and resonate multiple inductors and capacitive electrodes at a resonant frequency at multiple phases to transfer power via resonant electric field coupling.

Abstract: An auxiliary inverter for use with a main inverter of a transmitter of a wireless power transfer system comprises: a coupling element; an output network electrically connected to the coupling element; and an adjustable power source electrically connected to the coupling element via the output network, an input voltage to the coupling element based on a detected signal. The coupling element is configured to induce a voltage in the main inverter of the transmitter of the wireless power transfer system to manage reflected impedance at the main inverter. The induced voltage is based on the input voltage to the coupling element.

Abstract: A rectifier for use in a receiver of a wireless power transfer system for receiving wireless power transferred for a transmitter of the wireless power transfer system. The rectifier comprises a field effect transistor (FET) comprising: a source terminal electrically connected to ground; a drain terminal electrically connected to a receive element of the receiver. The receive element is for extracting power from the transmitter of the wireless power transfer system. The FET further comprises a gate terminal electrically connected to the receive element. The gate terminal is driven by a gate signal in phase with an input signal received at the receive element.

Abstract: A wireless power transfer system is provided. The wireless power transfer system comprises a resonator comprising a capacitor. The capacitor comprises at least two active electrodes; and a passive electrode adjacent the active electrodes and configured to encompass the active electrodes to at least partially eliminate environmental influences affecting the active electrodes and to increase the overall capacitance of the system. The resonator further comprises at least one inductive coil electrically connected to the active electrodes, wherein the resonator is configured to extract power from a generated electric field via resonant electric field coupling.

Abstract: A transmit resonator is provided. The transmit resonator comprises: two inductors; a switching network electrically connected to the inductors; a plurality of capacitive electrodes electrically connected to the switching network; a detector communicatively connected to the capacitive electrodes; and a controller communicatively connected to the switching network and the detector. The detector is configured to detect impedance. The controller is configured to control the switching network to control which electrodes are connected to the inductors based on the detected impedance. The inductors and electrodes are configured to resonate to generate an electric field.

Abstract: A wireless power transfer system is provided. The wireless power transfer system comprises a resonator comprising a capacitor. The capacitor comprises at least two active electrodes; and a passive electrode adjacent the active electrodes and configured to encompass the active electrodes to at least partially eliminate environmental influences affecting the active electrodes and to increase the overall capacitance of the system. The resonator further comprises at least one inductive coil electrically connected to the active electrodes, wherein the resonator is configured to extract power from a generated electric field via resonant electric field coupling.

Abstract: A resonator is provided. The resonator comprises at least two inductors and at least four capacitive electrodes electrically connected to the inductors. The capacitive electrodes and the inductors are configured to resonate and generate or couple with an electric field. The electrodes have either four fold mirror or rotational symmetry.

Abstract: A transmit resonator is provided. The transmit resonator comprises: two inductors; a switching network electrically connected to the inductors; a plurality of capacitive electrodes electrically connected to the switching network; a detector communicatively connected to the capacitive electrodes; and a controller communicatively connected to the switching network and the detector. The detector is configured to detect impedance. The controller is configured to control the switching network to control which electrodes are connected to the inductors based on the detected impedance. The inductors and electrodes are configured to resonate to generate an electric field.

Abstract: A transmit resonator is provided. The transmit resonator comprises: at least two inductors; at least one switching network electrically connected to one inductor of the at least two inductors; at least one secondary capacitive electrode electrically connected to the switching network; at least one main capacitive electrode electrically connected to one inductor of the at least two inductors; and a controller electrically connected to the switching network. The controller is configured to control the switching network to control connection of the secondary capacitive electrode to one inductor of the at least two inductors via the switching network. The inductors and electrodes are configured to resonate to generate an electric field.