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公开(公告)号：US12072484B2
公开(公告)日：2024-08-27
申请号：US17353724
申请日：2021-06-21
CPC分类号： G02B26/0833 , H03H9/15 , H03H2007/006 , H03H2009/155
摘要： Techniques are described herein for dynamically adjusting a resonant frequency of a resonance circuit to optimize power transfer to a mirror device such as a MEMS mirror. A variable capacitance circuit can be operated responsive to a bias control signal. A capacitance control circuit can vary the bias control signal to the resonance circuit responsive to a sense signal. The sense circuit is configured to generate the sense signal responsive to an output of the mirror device. By monitoring a signal level from the output of the mirror device 130, and adjusting the bias control signal of the resonance circuit, the exact resonance frequency of the resonance circuit can be adjusted until a peak signal level is observed, thus improving the efficiency of the energy transferred from the driver circuit 110 to the mirror device 130, and counteracting the impact of parasitic capacitances on the resonance.
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公开(公告)号：US11940617B2
公开(公告)日：2024-03-26
申请号：US16945349
申请日：2020-07-31
CPC分类号： G02B26/0858 , B06B1/0207 , G02B26/10 , G02B27/0176 , H03H7/1708 , H03H7/175 , G02B2027/0154 , H03H2007/006
摘要： Examples are disclosed herein that relate to driving a resonant scanning mirror system using a linear LC resonant driving scheme. In one example, a resonant scanning mirror system includes a scanning mirror, first and second mirror drive elements, and a drive circuit to drive the scanning mirror at a resonant frequency. The drive circuit includes one or more signal sources configured to create a first source signal and a second source signal that is 180 degrees out of phase with the first source signal. The drive circuit further includes a buffer stage configured to receive the first and second source signals and output first and second drive signals, a first resonant LC stage configured to amplify the first drive signal for provision to the first mirror drive element, and a second resonant LC stage configured to amplify the second drive signal for provision to the second mirror drive element.
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公开(公告)号：US12094241B2
公开(公告)日：2024-09-17
申请号：US17554401
申请日：2021-12-17
CPC分类号： G06V40/166 , H02J3/02
摘要： A system and method generate an alternating current (AC) input signal by a digitally controlled resonant drive circuit. The method includes driving a face tracking sensor with the input signal. An output signal is received from the face tracking sensor and an amplitude of the output signal is compared to a target amplitude. A duty cycle of the resonant drive circuit is modified based on the comparison to control the amplitude of the output signal about the target amplitude.
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公开(公告)号：US11923703B2
公开(公告)日：2024-03-05
申请号：US17559734
申请日：2021-12-22
IPC分类号： H02J7/00
CPC分类号： H02J7/0016 , H02J7/00036 , H02J7/0063 , H02J7/00712
摘要： A system includes a first sense circuit configured to provide a first output representative of sensed current provided by a first battery coupled to a first load. A second sense circuit is configured to provide a second output representative of sensed current provided by a second battery coupled to the first load. An input current controller is coupled to receive the respective first and second outputs and to couple between the second battery and the first load to control the current provided by the second battery.
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公开(公告)号：US12126205B2
公开(公告)日：2024-10-22
申请号：US17585462
申请日：2022-01-26
CPC分类号： H02J7/0063 , G06F1/163
摘要： A system for facial movement detection with reduced size and reduced cost by employing a novel resonant drive and sampling scheme is disclosed. An example battery operated system includes a driver circuit, an LC resonance circuit formed by an inductor circuit and a capacitance from an antenna, and a sample and hold circuit. The driver circuit can be configured by a controller to generate a drive signal for the LC resonance circuit, which has a resonant frequency that changes as the capacitance of the antenna varies responsive to facial movements of the user. The sample and hold circuit samples the output of the LC resonance circuit responsive to a falling edge of the drive signal for the LC resonance circuit, wherein an output of the sample and hold circuit is a sampled sense signal that may be further processed to detect facial movements of the user.
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公开(公告)号：US20240283257A1
公开(公告)日：2024-08-22
申请号：US18590244
申请日：2024-02-28
CPC分类号： H02J7/0016 , H01M10/441 , H02J7/00032 , H02J7/0047 , H02J7/0063 , H02J2207/20
摘要： A system includes a first sense circuit configured to provide a first output representative of sensed current provided by a first battery coupled to a first load. A second sense circuit is configured to provide a second output representative of sensed current provided by a second battery coupled to the first load. An input current controller is coupled to receive the respective first and second outputs and to couple between the second battery and the first load to control the current provided by the second battery.
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公开(公告)号：US11888288B2
公开(公告)日：2024-01-30
申请号：US17102372
申请日：2020-11-23
发明人： Chang Joon Park , Martin Francis Galinski , Niranjan Achugundla Puttaswamy , Brandon Baxter Harris , Patrick Codd , Barry Thompson
摘要： A system is provided for maintaining a safe operating area while also providing a suitable forward bias voltage to drive a laser diode. The system can monitor a voltage that is applied to a laser diode driver using a threshold that is based on the fabrication process of the laser diode driver. For example, a system can utilize a first threshold for a laser diode driver that is fabricated utilizing a 10 nm process and utilize a second threshold for another laser diode driver that is fabricated utilizing a 20 nm process. The threshold can also be based on a color of the laser or a desired operation mode. The system can monitor a voltage applied to a laser diode using different thresholds while controlling a bleed current to ensure that the laser diode is forward biased while mitigating the risk of silicon breakdown of the laser diode driver.
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公开(公告)号：US11716027B2
公开(公告)日：2023-08-01
申请号：US17456154
申请日：2021-11-22
CPC分类号： H02M3/1584 , G01R19/16538 , G02B27/017 , G05F1/575 , G09G3/3696 , H02M1/0025 , H02M3/071
摘要： A power supply device includes a switching converter, an inductor, and a linear voltage regulator. The inductor is electrically connected between a first switching node and a second switching node of the switching converter. The power supply device is configured such that when the switching converter is in an ON state the inductor is charged with a charging current. The power supply device is further configured such that when the switching converter is in an OFF state, the switching converter modulates an input voltage to generate a positive-bias output voltage at a positive-bias output node, the charging current flows from the inductor such that a negative input voltage is generated at a linear voltage regulator input node, and the linear voltage regulator regulates the negative input voltage to generate a negative-bias output voltage at a negative-bias output node.
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公开(公告)号：US11675421B1
公开(公告)日：2023-06-13
申请号：US17561282
申请日：2021-12-23
CPC分类号： G06F3/011 , A61B5/16 , G01D5/24 , G06F1/163 , G06F3/012 , G06F3/015 , G06V40/16 , G06V40/174 , G06V40/176 , H02J7/0063
摘要： A time-multiplexing resonant drive scheme is described that reuses an inductor circuit for multiple functional purposes in a Mixed Reality (MR) device. A driver circuit and a multiplexer circuit are dynamically configured by a controller circuit for three operating modes. In the first mode, energy is coupled from a battery to the inductor circuit in a forward direction to charge the inductor circuit and generate a positive power supply voltage. In the second mode, energy is coupled from to the inductor circuit in a reverse direction to charge the inductor circuit and generate a negative power supply voltage. In the third mode, the inductor is operated with an antenna as part of a resonance drive circuit, where facial movements of the user can be detected based on the response. Reduced component count and reduced cost requirements are achieved by the described scheme.
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