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公开(公告)号：US11486914B2
公开(公告)日：2022-11-01
申请号：US17492210
申请日：2021-10-01
摘要： A circuit includes a tank capacitor coupled between first and second nodes, and a sense resistor having a first terminal coupled to the first node and a second terminal coupled to a regulator input. A switching circuit has first and second inputs coupled to the first and second terminals of the sense resistor. A gain stage has first and second inputs capacitively coupled to first and second outputs of the switching circuit. An analog-to-digital converter receives the output of the gain stage, and receives first and second differential voltages. A reference voltage generator has a temperature independent current source coupled to source current to a reference resistor, the first differential reference voltage being formed across the reference resistor. The reference resistor and sense resistor are located sufficiently close to one another on a single common substrate such that they remain at substantially a same temperature.
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公开(公告)号：US11422663B1
公开(公告)日：2022-08-23
申请号：US17332357
申请日：2021-05-27
发明人： Kien Beng Tan , Eng Jye Ng , Hon Siong Ng , Tong Tee Tan
摘要： In an example, a method of sensing on a touchscreen including a plurality of touch sensors arranged in rows and columns on the touchscreen is described. The method includes detecting a passive touch on the touchscreen and a positon of an active stylus; determining a plurality of locations across the touchscreen corresponding to the passive touch and a positon of the active stylus, where each of the plurality of locations corresponds to a location of one of the plurality of touch sensors. The method includes transmitting a first uplink signal to a first group of the plurality of locations including a first fraction of the plurality of locations; and transmitting a second uplink signal to a second group of the plurality of locations including a second fraction of the plurality of locations, the first uplink signal being different from the second uplink signal.
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公开(公告)号：US20220264082A1
公开(公告)日：2022-08-18
申请号：US17736504
申请日：2022-05-04
发明人： Hong Chean CHOO , Lookah CHUA , Wai Yin HNIN
摘要： An electronic device includes a pixel array having a plurality of rows with active imaging pixels, and at least one row with test pixels. Each of the test pixels includes a test voltage generation circuit generating a test voltage, a switching circuit receiving the test voltage and an image pixel output signal and passing the test voltage as output when in a test mode, a comparison circuit receiving the output from the switching circuit and an analog to digital conversion signal and asserting a counter reset signal when the output from the switching circuit and the analog to digital conversion signal are equal in voltage, and a counter beginning counting at a beginning of each test cycle within the test mode, stopping counting upon assertion of the counter reset signal, and outputting its count upon stopping counting. The count is proportional to the test voltage when in the test mode.
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公开(公告)号：US11368052B2
公开(公告)日：2022-06-21
申请号：US16930651
申请日：2020-07-16
发明人： Yannick Guedon
摘要： Disclosed herein is a bridge rectifier and associated control circuitry collectively forming a “regtifier”, capable of both rectifying an input time varying voltage as well as regulating the rectified output voltage produced. To accomplish this, the gate voltages of transistors of the bridge rectifier that are on during a given phase may be modulated via analog control (to increase the on-resistance of those transistors) or via pulse width modulation (to turn off those transistors prior to the end of the phase). Alternatively or additionally, the transistors of the bridge rectifier that would otherwise be off during a given phase may be turned on to help dissipate excess power and thereby regulate the output voltage. A traditional voltage regulator, such as a low-dropout amplifier, is not used in this design.
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公开(公告)号：US11356654B2
公开(公告)日：2022-06-07
申请号：US16514695
申请日：2019-07-17
发明人： Hong Chean Choo , Lookah Chua , Wai Yin Hnin
摘要： An electronic device includes a test voltage generation circuit to generate a test voltage as a function of a regulator voltage, and a switching circuit to receive the test voltage and an image pixel output signal, and to pass the test voltage as output when in a test mode. A comparison circuit receives the output from the switching circuit and an analog to digital conversion signal, and asserts a counter reset signal when the output from the switching circuit and the analog to digital conversion signal are equal in voltage. A counter begins counting at a beginning of each test cycle within the test mode, stops counting upon assertion of the counter rest signal, and outputs its count upon stopping counting. The count is proportional to the test voltage when in the test mode.
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公开(公告)号：US20220173617A1
公开(公告)日：2022-06-02
申请号：US17107161
申请日：2020-11-30
发明人： Wenhe Zhao , Robin Tanzania
IPC分类号： H02J50/12 , H02M7/5387 , H02J7/02 , H02M7/217
摘要： A method for operating a wireless charging transmitter includes switching, by the wireless charging transmitter, an operating mode of a full bridge inverter of the wireless charging transmitter from a first mode to a second mode; and changing, by the wireless charging transmitter, an operating point of the wireless charging transmitter from a first operating point associated with the first mode to a second operating point associated with the second mode, the second operating point being selected to dampen a change in a rectifier voltage of a wireless charging receiver inductively coupled to the wireless charging transmitter.
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17.发明授权公开(公告)号：US11251691B2
公开(公告)日：2022-02-15
申请号：US17011439
申请日：2020-09-03
IPC分类号： H02M7/217 , H03K19/017 , H02M1/08 , H02M1/32
摘要： A high-side switching transistor of a rectifier circuit is driven by a high-side driver circuit to supply current to an output node. The high-side driver circuit is powered between a capacitive bootstrap node and the output node. A boot charge circuit charges the bootstrap capacitor by supplying current to the bootstrap node. The boot charge circuit includes: a first current path that selectively supplies a first charging current to the bootstrap node when the rectifier circuit is operating in a switching mode; and a second current path that selectively supplies a second charging current to the bootstrap node when the rectifier circuit is operating in a reset mode.
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公开(公告)号：US20210391752A1
公开(公告)日：2021-12-16
申请号：US17403060
申请日：2021-08-16
发明人： Yannick GUEDON
摘要： A method of wirelessly transmitting power includes: causing a power transmission circuit to transmit, to a master power reception circuit, a portion of power it is capable of transmitting; adjusting operation of a slave power reception unit until a first rectified voltage produced by the master power reception circuit and a second rectified voltage produced by the slave power reception unit are equal; causing the power transmission circuit to transmit additional power to the slave power reception unit, resulting in the first and second rectified voltages being unequal; and adjusting operation of the slave power reception unit until the first and second rectified voltages are again equal. A dummy load is connected to the slave power reception unit prior to causing the power transmission circuit to transmit the additional power, and is disconnected once the first and second rectified voltages are equal.
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19.发明申请公开(公告)号：US20210382576A1
公开(公告)日：2021-12-09
申请号：US17230317
申请日：2021-04-14
发明人： Kusuma Adi NINGRAT , Cam Chung LA
IPC分类号： G06F3/044 , G06F3/041 , G06F3/0488
摘要： A touch-screen-controller (TSC) performs mutual sensing to acquire touch strength values from a touch matrix formed by capacitively intersecting conductive lines. For each line, the TSC generates an emulated self capacitance value from an associated touch strength value based upon a position of that line compared to a location on the touch matrix adjacent to which a first touch type is expected to occur, and determines presence of the first touch type adjacent to the touch matrix based upon the emulated values. The emulated values for each conductive line may be weighted based upon its closeness to the location where the first touch type is expected to occur. The weighting may be zero if its associated conductive line is outside of the location where the first touch type is expected to occur, and may be one if inside of the location where the first touch type is expected to occur.
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公开(公告)号：US11196301B1
公开(公告)日：2021-12-07
申请号：US17124174
申请日：2020-12-16
发明人： Teerasak Lee
摘要： A bridge rectifier is formed by a first transistor coupled between a regulator output and a first tap, a second transistor coupled between the regulator output and a second tap, a third transistor coupled between the first tap and ground, and a fourth transistor coupled between the second tap and ground. A first comparator circuit, when enabled, compares ground to a voltage at the first tap and asserts a first low-side control signal to turn on the third transistor when the voltage at the first tap is below ground, and, when reset, samples an offset of the first comparator circuit. A second comparator circuit, when enabled, compares ground to a voltage at second first tap and asserts a second low-side control signal to turn on the fourth transistor when the voltage at the second tap is below ground, and, when reset, samples an offset of the second comparator circuit.
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