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公开(公告)号：US10958154B2
公开(公告)日：2021-03-23
申请号：US16025779
申请日：2018-07-02
发明人： Rui Liu , Gustavo J. Mehas , Lijie Zhao
摘要： In accordance with aspects of the present invention, a wireless power circuit is presented. In some embodiments, the wireless power circuit includes one or more high-side transistors; one or more low-side transistors coupled in series with the one or more high-side transistors, wherein the one or more low-side transistors can be controlled as current sources.
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公开(公告)号：US10705130B2
公开(公告)日：2020-07-07
申请号：US15998716
申请日：2018-08-16
发明人： Rui Liu , Lijie Zhao
摘要： A method of adaptively operating a transmit detection circuit is presented. The method includes powering the transmit detection circuit with a capacitor charged by an LDO; receiving a digital ping signal from a transmitter; receiving a clock signal from a local oscillator; updating a register to accommodate timing of the digital ping signal; and generating a signal indicating whether the transmitter is present.
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公开(公告)号：US10340786B2
公开(公告)日：2019-07-02
申请号：US15897448
申请日：2018-02-15
发明人： Lijie Zhao , Yue Wang , Stephen Ulbrich
摘要： A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.
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公开(公告)号：US20190137554A1
公开(公告)日：2019-05-09
申请号：US15998716
申请日：2018-08-16
发明人： Rui Liu , Lijie Zhao
摘要： In accordance with some embodiments of the present invention, a method of adaptively operating a transmit detection circuit is presented. The method includes powering the transmit detection circuit with a capacitor charged by an LDO; receiving a digital ping signal from a transmitter; receiving a clock signal from a local oscillator; updating a register to accommodate timing of the digital ping signal; and generating a signal indicating whether the transmitter is present.
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公开(公告)号：US10699175B2
公开(公告)日：2020-06-30
申请号：US16367189
申请日：2019-03-27
发明人： Rui Liu , Tao Qi , Lijie Zhao , Gustavo James Mehas , Tae Kwang Park , Zhitong Guo , Siqiang Fan
IPC分类号： G06K7/08 , G06K19/06 , G06K7/10 , G06K19/077 , G06Q20/32
摘要： According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.
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公开(公告)号：US11309738B2
公开(公告)日：2022-04-19
申请号：US16052492
申请日：2018-08-01
发明人： Yue Wang , Lijie Zhao
摘要： In accordance with aspects of the present invention, a method and apparatus for demodulating an amplitude-modulated wireless power signal is presented. A method of receiving an amplitude modulated component of a wireless power transmission signal according to some embodiments includes receiving an input signal, wherein the input signal is based on an amplitude modulated wireless power signal; and applying an offset to the input signal to receive the amplitude modulated component. A demodulator according to some embodiments can include a first voltage-to-current converter that receives an input signal related to an amplitude modulated wireless power signal; a second voltage-to-current converter that receives an offset signal; and a summing node that adjusts a first current produced by the first voltage-to-current converter by a second current produced by the second voltage-to-current converter to produce an output signal.
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公开(公告)号：US10963764B2
公开(公告)日：2021-03-30
申请号：US16510498
申请日：2019-07-12
发明人： Rui Liu , Tao Qi , Lijie Zhao , Gustavo James Mehas , Tae Kwang Park , Zhitong Guo , Siqiang Fan
IPC分类号： G06K7/08 , G06K19/06 , G06K7/10 , G06K19/077 , G06Q20/32
摘要： According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.
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公开(公告)号：US10826315B2
公开(公告)日：2020-11-03
申请号：US16175393
申请日：2018-10-30
发明人： Rui Liu , Lijie Zhao
摘要： In some embodiments, a wireless power charging circuit includes a wireless power receiver configured to receive wireless power from a receive coil and to produce a first voltage; an open loop capacitor divider coupled to receive the first voltage from the wireless power receiver and configured to provide a second voltage, the second voltage being reduced from the first voltage; and a linear battery charger coupled to receive the second voltage from the open loop capacitor and configured to provide a charging voltage to provide to a battery coupled to the system.
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公开(公告)号：US10579916B2
公开(公告)日：2020-03-03
申请号：US16028207
申请日：2018-07-05
发明人： Rui Liu , Tao Qi , Lijie Zhao
摘要： In accordance with aspects of the present invention, a magnetic secured transmission system is presented. A magnetic secure transmission (MST) system can include a full-bridge driver that includes four transistors configured to regulate current through a coil; and a driving controller coupled to drive the full-bridge driver at a high frequency. In some embodiments, the transistors in the full bridge regulator are driven with a high frequency pulsed-wave modulated (PWM) signal to control the current through the coil. A method of magnetic secured transmission (MST) of MST data according to some embodiments includes receiving the MST data; generating coil data in response to the MST data; driving transistors in a full bridge at a high frequency to drive current through a coil according to the coil data.
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公开(公告)号：US10554061B2
公开(公告)日：2020-02-04
申请号：US15828158
申请日：2017-11-30
发明人： Rui Liu , Gustavo James Mehas , Lijie Zhao , Tae Kwang Park , Zhitong Guo
IPC分类号： H02J7/00
摘要： A charging system that includes a switching control circuit coupled to four series-coupled MOSFET transistors; a flying capacitor coupled across two of the four series-coupled MOSFET transistors; and node between the two of the four series coupled transistors that couples to an output inductor to form a buck regulator is presented. Embodiments of the charging system can have increased efficiency, can reduce the size and inductance of the output inductor, and can be produced with a low voltage process.
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