Nxp Usa, Inc.

Freescale Semiconductor,inc.

Chongli Wu

Xiang Gao

Wanfu Ye

Mark Lancaster

Jie Jin

Li Wang

Yizhong Zhang

Dengyu Jiang

Michael E Stanley

Xiaoxiang Geng

Lingling Wang

Zhendong Fei

Xuwei Zhou

Kai-Wen Cheng

A wireless charging transmitter includes first and second input terminals for receiving an input voltage from a power source, a coil, an inverter having first and second inverter input terminals coupled to the first and second input terminals respectively, and first and second inverter output terminals for providing an output voltage to the coil. A control system is configured to monitor a voltage between the first and second input terminals, and control the inverter to adjust the output voltage, based on an offset between the monitored voltage and a target voltage, to at least partially compensate the offset. The wireless charging transmitter may further include an ideal diode coupled between one of the input terminals and the inverter.

Wireless charging transmitter and method for controlling the wireless charging transmitter

A configurable control loop arrangement for forming a control loop of a DC-DC converter that is configured to generate a control signal to control the DC-DC converter, the configurable control loop arrangement comprising: a digital-to-analog converter; a comparator; a timer configured to provide a timing-signal for controlling one or more of: the comparator in the determination of the comparison signal; the application of the comparison signal to a configurable-event-generation-logic-module; and the operation of the configurable-event-generation-logic-module; wherein the configurable-event-generation-logic-module comprises a flip-flop circuit, and wherein the configurable-event-generation-logic-module, when implemented in the control loop, is configured to provide for generation of the control signal based on the comparison signal, the timing-signal and a selected mode of the flip-flop circuit, and wherein the control signal is for application to one or more switches of the DC-DC converter.

Configurable control loop arrangement

A method includes selectively communicating each of a plurality of motor winding signals to a first node at an integrated circuit based on whether the corresponding motor winding is energized. A zero-crossing event at an unenergized motor winding signal is determined based the unenergized motor winding signal and based on a signal at the first node.

Zero crossing detection circuit for motor controller and method therefor

The embodiments described herein provide a power transmitter for wireless charging of an electronic device and methods of its operation. The power transmitter uses an inverter configured to generate a square wave from a potentially wide ranging DC input voltage. The inverter is configured to generate the square wave with a duty cycle that results in a desired equivalent voltage output, effectively independent of the DC input voltage that is provided. Thus, by generating a square wave with a selectable duty cycle the inverter provides the ability to facilitate wireless power transfer with a wide range of DC input voltages. Furthermore, in some embodiments the power transmitter may provide improved power transfer efficiency using a quasi-resonant phase shift control strategy with adjustable dead time and a matching network that is dynamically selectable to more effectively couple with the transmitter coil combination being used to transmit power to the electronic device.

Wireless power transmitters with wide input voltage range and methods of their operation

A power receiver for a wireless power transmission system that includes a power transmitter has input circuitry that converts power received from the power transmitter into an input signal. A regulator regulates the input signal to generate a regulated output signal based on a current reference signal and a voltage reference signal, and a load receives the regulated output signal. The regulator controls at least one of the current reference signal and the voltage reference signal to control power loss within the regulator. In one embodiment, the regulator globally controls the voltage of the rectified input signal and locally controls the current reference signal to limit power loss in the regulator as well as meet system load requirements.

Power receiver for wireless charging system

A system and method are present for generating a modulated waveform. A timer is configured to generate a first modulated waveform signal, and an adder module is configured to calculate a delay. The delay includes at least one of an edge fractional delay and a dead time fractional delay. A delay module is operably coupled to the timer and the adder module. The delay module is configured to delay at least one of a rising edge of the first modulated waveform signal and a falling edge of the first modulated waveform signal by the delay to generate a second modulated waveform signal that has a higher frequency resolution than a frequency resolution of the first modulated waveform signal.

Methods and apparatus for generating a modulated waveform

Methods and systems are provided for performing sampling sequences using a control module. One exemplary method involves transferring sampling configuration information for a sampling sequence from memory to a conversion module. The conversion module performs the sequence in accordance with the configuration information by performing sampling processes at a plurality of sampling times to obtain a plurality of samples, and transferring results corresponding to the plurality of samples from the conversion module to the memory. At least some sampling times of the plurality of sampling times are nonperiodic with respect to the other sampling times of the plurality of sampling times. In exemplary embodiments, the sampling configuration information includes a sampling mode criterion, and the conversion module either automatically performs a sampling process or performs the sampling process in response to a trigger signal based on the sampling mode criterion for that sampling process.

DMA-assisted irregular sampling sequences

Apparatus and methods are provided for performing a sampling sequence for a plurality of samples. An analog-to-digital conversion module comprises a sampling module, a register, and a sampling control module coupled to the sampling module and the register. The sampling module is configured to convert analog signals into corresponding digital values in response to sampling trigger signals and the register is configured to maintain scan mode criteria for a plurality of samples. The sampling control module is configured to identify a scan mode criterion for a respective sample of the plurality of samples, automatically generate a sampling trigger signal when the scan mode criterion for the respective sample is equal to a first value, and generate the sampling trigger signal in response to a timing trigger signal when the scan mode criterion for the respective sample is equal to a second value.

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Queen Creek, AZ, United States of America

Chongli Wu