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公开(公告)号：US20210175745A1
公开(公告)日：2021-06-10
申请号：US16709699
申请日：2019-12-10
Applicant: Integrated Device Technology, Inc.
Inventor： Nicholaus Smith , Chan Young Jeong , Detelin Martchovsky , Ashley DeWolfe , Damla Acar
Abstract: A wireless power device is presented that avoids transmit conflicts. The device can include a rectifier circuit coupled to a coil; a transmit driver coupled to the rectifier circuit; a transmit detect circuit configured to detect receipt of transmitted wireless power at the coil; and a controller coupled to the transmit driver and the transmit detect circuit, the controller receiving a signal from the transmit detect circuit and providing an alert of the presence of the transmitted wireless power, the controller activating the transmit driver to transmit wireless power in absence of the signal. The wireless device can determine an operating mode and in a transmit mode determine presence of a received power. If received power is detected an alert can be provided and an off state initiated. If transmit power is not detected the transmit driver can be activated.
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公开(公告)号：US11005298B2
公开(公告)日：2021-05-11
申请号：US16388476
申请日：2019-04-18
Applicant: Integrated Device Technology, Inc.
Inventor： Nicholaus Smith , Rui Liu , Amit D. Bavisi , Jiangjian Huang , Gabriel Aungurencei
Abstract: In a wireless power transfer operation, the operating parameters are adjusted to improve efficiency by reducing the transmit and receive coil currents as follows. First, the transmitter causes the receiver to reduce the receive coil current to the lowest value based on the transmitter/receiver communication while still delivering the same amount of power to the load as before the AC current was adjusted to the minimum value. Then the transmitter may change the operating parameters to increase or preserve the power provided to the receiver without decreasing efficiency or with only small decrease in efficiency, or with increasing the efficiency. For example, the transmitter may increase the VBRG voltage (the DC voltage powering the transmit coil) or the operating frequency to maintain or increase output power levels at lower or the same AC and DC current levels. Other features are also provided.
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公开(公告)号：US10938255B2
公开(公告)日：2021-03-02
申请号：US16368777
申请日：2019-03-28
Applicant: Integrated Device Technology, Inc.
Inventor： Nicholaus Smith , Rui Liu , Tao Qi , Amit D. Bavisi , Chan Young Jeong
IPC: H02J50/90 , H02J50/10 , H03K17/955 , H02J7/02 , H02J50/40
Abstract: A capacitor sensor array (or grid) over a wireless power transmission coil can include a first set of lines; a second set of lines intersecting the first set of lines; a first multiplexer coupled to provide a charge (e.g. in the form of a DC voltage) from a voltage source to the first set of lines and provide first signals to detect voltages on each line; and a second multiplexer coupled to provide a charge from the voltage source to the second set of lines and provide second signals to detect voltages on each line, wherein an object positioned with respect to the first set of lines and the second set of lines is located. According to some embodiments, a wireless power receive coil and a rectifier circuit can be used in forming a capacitor sensor, to sense the capacitance between the receive and transmit coils for better alignment between the two coils. Other embodiments are also provided.
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Patent Agency Ranking
公开(公告)号：US10797535B2
公开(公告)日：2020-10-06
申请号：US16154665
申请日：2018-10-08
Applicant: Integrated Device Technology, Inc.
Inventor： Nicholaus Smith , Stefan Maireanu , Haiwen Jiang , David Wilson
Abstract: In accordance with some embodiments of the present invention, a method of determining a Q-factor in a transmit circuit with a resonant circuit includes setting a system voltage; performing a coarse scan to determine a course resonant frequency; performing a fine scan based on the course scan to determine a resonant frequency; performing a final measurement at the resonant frequency to determine an average system voltage and an average peak voltage of the resonant circuit; calculating a Q parameter from the average system voltage and the average peak voltage; and calculating the Q-factor from the Q parameter.
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公开(公告)号：US11909220B2
公开(公告)日：2024-02-20
申请号：US16709699
申请日：2019-12-10
Applicant: Integrated Device Technology, Inc.
Inventor： Nicholaus Smith , Chan Young Jeong , Detelin Martchovsky , Ashley DeWolfe , Damla Acar
Abstract: A wireless power device is presented that avoids transmit conflicts. The device can include a rectifier circuit coupled to a coil; a transmit driver coupled to the rectifier circuit; a transmit detect circuit configured to detect receipt of transmitted wireless power at the coil; and a controller coupled to the transmit driver and the transmit detect circuit, the controller receiving a signal from the transmit detect circuit and providing an alert of the presence of the transmitted wireless power, the controller activating the transmit driver to transmit wireless power in absence of the signal. The wireless device can determine an operating mode and in a transmit mode determine presence of a received power. If received power is detected an alert can be provided and an off state initiated. If transmit power is not detected the transmit driver can be activated.
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公开(公告)号：US11050305B2
公开(公告)日：2021-06-29
申请号：US16378273
申请日：2019-04-08
Applicant: Integrated Device Technology, Inc.
Inventor： Nicholaus Smith , Chan Young Jeong
Abstract: Embodiments herein provide a device for calibrating a voltage driven by a PWM signal for a circuit board. The device includes a controller configured to generate the PWM signal according to a PWM duty cycle value, and a voltage regulator configured to generate an output voltage according to the PWM signal. The controller is further configured to calibrate a relationship between the PWM duty cycle value and the output voltage based on a plurality of configured PWM duty cycle values and a plurality of corresponding voltages measured from the voltage regulator, and drive the circuit board by configuring the PWM duty cycle value based on the calibrated relationship.
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公开(公告)号：US11005306B2
公开(公告)日：2021-05-11
申请号：US16368790
申请日：2019-03-28
Applicant: Integrated Device Technology, Inc.
Inventor： Tao Qi , Gustavo Mehas , Chan Young Jeong , Xinyun Gu , Nicholaus Smith , Amit D. Bavisi , Daryl Sugasawara , Aihua Lee
Abstract: Embodiments described herein provide a wireless power transmitter that dynamically adjusts the deadtime to reduce power loss. Specifically, the wireless power transmitter includes a transistor circuit for switching a first voltage at a first node and a second voltage at a second node, and a LC circuit coupled between the first node and the second node. The wireless power transmitter further includes a controller coupled to the transistor circuit. The controller is configured to determine whether either of the first voltage and the second voltage is negative during a deadtime of switching. The controller is configured to increment or decrement the deadtime by an adjustment amount depending on whether negative voltage is detected.
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公开(公告)号：US20190109499A1
公开(公告)日：2019-04-11
申请号：US16154665
申请日：2018-10-08
Applicant: Integrated Device Technology, Inc.
Inventor： Nicholaus Smith , Stefan Maireanu , Haiwen Jiang , David Wilson
Abstract: In accordance with some embodiments of the present invention, a method of determining a Q-factor in a transmit circuit with a resonant circuit includes setting a system voltage; performing a coarse scan to determine a course resonant frequency; performing a fine scan based on the course scan to determine a resonant frequency; performing a final measurement at the resonant frequency to determine an average system voltage and an average peak voltage of the resonant circuit; calculating a Q parameter from the average system voltage and the average peak voltage; and calculating the Q-factor from the Q parameter.
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