Abstract: This application provides a wireless charger and a control method. The wireless charger includes a class-E power amplifier and a tunable impedance circuit that is connected to an output end of the class-E power amplifier. The class-E power amplifier includes a switching transistor and a tunable capacitance circuit that is parallelly connected to the switching transistor. The wireless charger further includes a control unit, configured to obtain a constraint condition of the class-E power amplifier; determine N1 target equivalent load impedances of the class-E power amplifier based on the constraint condition; and adjust a capacitance value of the tunable capacitance circuit in the class-E power amplifier, and adjust an impedance value of the tunable impedance circuit, to enable an equivalent load impedance of the class-E power amplifier to match one of the N1 target equivalent load impedances.

Abstract: A receiver is for wirelessly receiving energy to power a device. The receiver comprises a plurality of receiver coils spaced apart from each other and a receiver circuitry connected to each of the plurality of receiver coils. Each of the plurality of receiver coils is configured to operate in a same wireless power frequency range and receive the energy from a transmitter. The receiver circuitry is configured to combine the energy received by each of the plurality of receiver coils to power the device.

Abstract: This application provides a wireless charger and a control method. The wireless charger includes a class-E power amplifier and a tunable impedance circuit that is connected to an output end of the class-E power amplifier. The class-E power amplifier includes a switching transistor and a tunable capacitance circuit that is parallelly connected to the switching transistor. The wireless charger further includes a control unit, configured to obtain a constraint condition of the class-E power amplifier; determine N1 target equivalent load impedances of the class-E power amplifier based on the constraint condition; and adjust a capacitance value of the tunable capacitance circuit in the class-E power amplifier, and adjust an impedance value of the tunable impedance circuit, to enable an equivalent load impedance of the class-E power amplifier to match one of the N1 target equivalent load impedances.

Abstract: Example energy balancing circuits and energy balancing apparatus are described. One example energy balancing circuit includes a coupling branch and a receiving branch. The coupling branch includes one sending coil and at least one receiving coil. Each receiving coil is coupled to the sending coil in an electromagnetic induction manner. The receiving branch includes at least one receiving subbranch. Each receiving coil is uniquely connected to one receiving subbranch. Each receiving subbranch includes a rectifier branch. A first receiving subbranch in the at least one receiving subbranch further includes a first boost branch connected to both a first rectifier branch and a first receiving coil. The first receiving coil is a receiving coil connected to the first receiving subbranch.

Abstract: A low-energy-consumption high-frequency wireless charging system for a lithium battery, the main structure comprises a power-supply module connected in series with a first resonant unit; wherein the first resonant unit is electrically connected to a resonance-tuning module; wherein the resonance-tuning module comprises a first shunt unit and a second resonant unit both electrically connected with the first resonant unit; and the first shunt unit is electrically connected to a third resonant unit and a rectifier module; wherein the third resonant unit is connected in parallel with the rectifier module; and the rectifier module is electrically connected with a voltage stabilizing module which is connected in parallel with a power-storage element. When the power-storage element is charging, the resonance-tuning module has a charging curve with better efficiency to achieve the effect of Class-E wireless fast charging.

Abstract: A high-frequency half-wave rectifier system of low-harmonicity and high-efficiency, which mainly comprises: a current output device having an output end and a first flow-return end respectively at both ends, a rectifying module, a resonant tuning unit, a first node, a voltage regulator module, at least one load element, a grounding portion, and at least one flow-return path. By means of the above structure, a simple circuit configuration and appropriate capacitance value setting are used to control the duty cycle of the rectifying module to approximately 74 nanoseconds and adjust the output power and improve the AC to DC conversion efficiency for the rectifying module under the low electromagnetic interference condition.

Abstract: The present invention relates to a multi-receiving wireless charging system and the method thereof. The main structure comprises: A wireless power supply component which wirelessly transmits a power signal to a plurality of receiving components, and the power signal is pass though one receiving element, one receiving compensation element, one receiving resistance element, and one rectifier element in each of the receiving components; and then the power signal is transmitted to the load element. Therefore, the chance of overheating is reduced and the charging efficiency is increased.

Abstract: A high-frequency half-wave rectifier system of low-harmonicity and high-efficiency, which mainly comprises: a current output device having an output end and a first flow-return end respectively at both ends, a rectifying module, a resonant tuning unit, a first node, a voltage regulator module, at least one load element, a grounding portion, and at least one flow-return path. By means of the above structure, a simple circuit configuration and appropriate capacitance value setting are used to control the duty cycle of the rectifying module to approximately 74 nanoseconds and adjust the output power and improve the AC to DC conversion efficiency for the rectifying module under the low electromagnetic interference condition.

Abstract: Embodiments of the present invention relate to the battery field, and provide an energy balancing circuit and an energy balancing apparatus, so that a balancing capability of a circuit can be improved while a loss of the circuit is kept stable. The energy balancing circuit includes a coupling branch and a receiving branch. The coupling branch includes one sending coil and at least one receiving coil. Each receiving coil is coupled to the sending coil in an electromagnetic induction manner. The receiving branch includes at least one receiving subbranch. Each receiving coil is uniquely connected to one receiving subbranch. Each receiving subbranch includes a rectifier branch. A first receiving subbranch in the at least one receiving subbranch further includes a first boost branch connected to both a first rectifier branch and a first receiving coil. The first receiving coil is a receiving coil connected to the first receiving subbranch.

Abstract: The AC rectifier system includes an AC source having a positive half-cycle terminal and a negative half-cycle terminal, a first rectifier module along with a first resonance unit having a first terminal connected to the positive half-cycle terminal, a second rectifier module along with a second resonance unit having a first terminal connected to negative half-cycle terminal, a regulator module along with a load element having a first terminal respectively connected to a second terminal of the first rectifier module and a second terminal of the second rectifier module, and a current divider module connected to the positive and negative half-cycle terminals the first terminals of the first and second rectifier modules, and the second terminal of the regulator module. Therefore current would be repeatedly transformed through the current divider module, enhancing heat reduction and transformation efficiency. The resonance units may also function as a filter.

Abstract: A device for controlling a feed motion of a feed control axis and a rotary motion of a rotary control axis, both axes being provided in a machine tool so that the rotary control axis is fed along the feed control axis. The device includes an interference estimating section estimating an interference generated between the feed control axis and the rotary control axis, based on a position command instructed to at least one of the feed control axis and the rotary control axis and a position and mass information of an eccentric load carried by the rotary control axis; and a command correcting section correcting a current command given to at least one of the feed control axis and the rotary control axis, based on the interference estimated by the interference estimating section.

Abstract: A device for controlling a feed motion of a feed control axis and a rotary motion of a rotary control axis, both axes being provided in a machine tool so that the rotary control axis is fed along the feed control axis. The device includes an interference estimating section estimating an interference generated between the feed control axis and the rotary control axis, based on a position command instructed to at least one of the feed control axis and the rotary control axis and a position and mass information of an eccentric load carried by the rotary control axis; and a command correcting section correcting a current command given to at least one of the feed control axis and the rotary control axis, based on the interference estimated by the interference estimating section.

Abstract: A motor control device detects acceleration of an object driven by a motor through a transmission mechanism, determines a correction command based on the detected acceleration of the driven object, corrects an operation command for the motor by the correction command thus determined, and then controls the motor operation based on the corrected operation command. In the process, a phase shifter combines an operation command signal indicating the operation command with a correction command signal indicating the correction command after adjustably changing the phase of the correction command signal with respect to the vibration of the driven object generated due to the natural vibration of the transmission mechanism.