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公开(公告)号：US20190097623A1
公开(公告)日：2019-03-28
申请号：US15951772
申请日：2018-04-12
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chin-Yuan Wei , Chih-Hsien Wang
Abstract: A power-on reset (POR) circuit includes: a signal generator circuit for generating a first and a second signal according to an input voltage, and a comparator circuit. The comparator circuit, having a non-zero input offset, includes a first MOS transistor with a first conductive type and having a first conductive type gate and a first threshold voltage, and a second MOS transistor with a first conductive type and having a second conductive type gate and a second threshold voltage. The input offset relates to a difference between the first and the second threshold voltage. The first and the second signal control the first and the second MOS transistors respectively to generate a POR signal. When the input voltage exceeds a POR threshold which relates to a predetermined multiple or ratio of the input offset, the POR signal transits its state.
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2.发明申请公开(公告)号：US20170085131A1
公开(公告)日：2017-03-23
申请号：US15095087
申请日：2016-04-10
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chih-Hsien Wang
Abstract: The present invention discloses a resonant wireless power transmitter circuit, which has an input impedance. The resonant wireless power transmitter circuit includes: a driver circuit coupled with a power supply, which includes at least a power switch; a switching resonant control circuit coupled with the driver circuit, such that the driver operates at a pre-determined or a variable resonant frequency; an adjustable impedance matching circuit coupled with the driver circuit, which includes at least a varactor; a transmitter circuit coupled with the impedance matching circuit and the driver circuit, which includes at least a transmitter coil; and an impedance control circuit coupled with the adjustable impedance matching circuit and the driver circuit, which provides an impedance control signal to control the reactance of the varactor, such that the input impedance of the resonant wireless power transmitter circuit is matched at the pre-determined or the variable resonant frequency.
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3.发明授权公开(公告)号：US11283298B2
公开(公告)日：2022-03-22
申请号：US16860999
申请日：2020-04-28
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chih-Hsien Wang
Abstract: The present invention discloses a resonant wireless power transmitter circuit, which has an input impedance. The resonant wireless power transmitter circuit includes: a driver circuit coupled with a power supply, which includes at least a power switch; a switching resonant control circuit coupled with the driver circuit, such that the driver operates at a pre-determined or a variable resonant frequency; an adjustable impedance matching circuit coupled with the driver circuit, which includes at least a varactor; a transmitter circuit coupled with the impedance matching circuit and the driver circuit, which includes at least a transmitter coil; and an impedance control circuit coupled with the adjustable impedance matching circuit and the driver circuit, which provides an impedance control signal to control the reactance of the varactor, such that the input impedance of the resonant wireless power transmitter circuit is matched at the pre-determined or the variable resonant frequency.
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Patent Agency Ranking
4.发明申请公开(公告)号：US20170108916A1
公开(公告)日：2017-04-20
申请号：US14885257
申请日：2015-10-16
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Hung-Chi Huang , Ying-Che Lo , Chih-Hsien Wang , Chih-Yi Hsiao , Lupu Liao
CPC classification number: G06F1/3296 , G06F1/3206 , G06F1/325 , G06F1/3287 , H04W52/0251 , H04W52/0254 , Y02D10/171 , Y02D10/172 , Y02D70/00
Abstract: The present invention discloses an event detection method for waking up a portable electronic device and an action sensor using same. The event detection method includes the steps of: under a normal operation mode, sensing action events by the action sensor with a first data sensing frequency, wherein the action sensor operates by a normal current to detect the action events; entering into a sleep mode; under the sleep mode, detecting a wake-up event by the action sensor with a second data sensing frequency, wherein the action sensor operates by a weak current to detect the wake-up event, wherein the weak current is smaller than the normal current, and the second data sensing frequency is not higher than the first data sensing frequency; and returning to the normal operation mode when the wake-up event is detected.
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5.发明授权公开(公告)号：US09684368B2
公开(公告)日：2017-06-20
申请号：US14885257
申请日：2015-10-16
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Hung-Chi Huang , Ying-Che Lo , Chih-Hsien Wang , Chih-Yi Hsiao , Lupu Liao
CPC classification number: G06F1/3296 , G06F1/3206 , G06F1/325 , G06F1/3287 , H04W52/0251 , H04W52/0254 , Y02D10/171 , Y02D10/172 , Y02D70/00
Abstract: The present invention discloses an event detection method for waking up a portable electronic device and an action sensor using same. The event detection method includes the steps of: under a normal operation mode, sensing action events by the action sensor with a first data sensing frequency, wherein the action sensor operates by a normal current to detect the action events; entering into a sleep mode; under the sleep mode, detecting a wake-up event by the action sensor with a second data sensing frequency, wherein the action sensor operates by a weak current to detect the wake-up event, wherein the weak current is smaller than the normal current, and the second data sensing frequency is not higher than the first data sensing frequency; and returning to the normal operation mode when the wake-up event is detected.
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6.发明申请公开(公告)号：US20200259372A1
公开(公告)日：2020-08-13
申请号：US16860999
申请日：2020-04-28
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chih-Hsien Wang
Abstract: The present invention discloses a resonant wireless power transmitter circuit, which has an input impedance. The resonant wireless power transmitter circuit includes: a driver circuit coupled with a power supply, which includes at least a power switch; a switching resonant control circuit coupled with the driver circuit, such that the driver operates at a pre-determined or a variable resonant frequency; an adjustable impedance matching circuit coupled with the driver circuit, which includes at least a varactor; a transmitter circuit coupled with the impedance matching circuit and the driver circuit, which includes at least a transmitter coil; and an impedance control circuit coupled with the adjustable impedance matching circuit and the driver circuit, which provides an impedance control signal to control the reactance of the varactor, such that the input impedance of the resonant wireless power transmitter circuit is matched at the pre-determined or the variable resonant frequency.
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7.发明授权公开(公告)号：US10680463B2
公开(公告)日：2020-06-09
申请号：US15095087
申请日：2016-04-10
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chih-Hsien Wang
Abstract: The present invention discloses a resonant wireless power transmitter circuit, which has an input impedance. The resonant wireless power transmitter circuit includes: a driver circuit coupled with a power supply, which includes at least a power switch; a switching resonant control circuit coupled with the driver circuit, such that the driver operates at a pre-determined or a variable resonant frequency; an adjustable impedance matching circuit coupled with the driver circuit, which includes at least a varactor; a transmitter circuit coupled with the impedance matching circuit and the driver circuit, which includes at least a transmitter coil; and an impedance control circuit coupled with the adjustable impedance matching circuit and the driver circuit, which provides an impedance control signal to control the reactance of the varactor, such that the input impedance of the resonant wireless power transmitter circuit is matched at the pre-determined or the variable resonant frequency.
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公开(公告)号：US10476499B2
公开(公告)日：2019-11-12
申请号：US15951772
申请日：2018-04-12
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chin-Yuan Wei , Chih-Hsien Wang
Abstract: A power-on reset (POR) circuit includes: a signal generator circuit for generating a first and a second signal according to an input voltage, and a comparator circuit. The comparator circuit, having a non-zero input offset, includes a first MOS transistor with a first conductive type and having a first conductive type gate and a first threshold voltage, and a second MOS transistor with a first conductive type and having a second conductive type gate and a second threshold voltage. The input offset relates to a difference between the first and the second threshold voltage. The first and the second signal control the first and the second MOS transistors respectively to generate a POR signal. When the input voltage exceeds a POR threshold which relates to a predetermined multiple or ratio of the input offset, the POR signal transits its state.
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