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公开(公告)号：US20200028509A1
公开(公告)日：2020-01-23
申请号：US16267861
申请日：2019-02-05
Applicant: THE CHARLES STARK DRAPER LABORATORY, INC.
Inventor： Paul A. Ward , James S. Pringle , Marc Steven Weinberg , Warner G. Harrison
Abstract: Provided is a Precision Voltage Reference (PVR). In one example, the PVR includes a resonator having an oscillation frequency, the resonator including a first proof-mass, a first forcer located adjacent a first side of the first proof-mass, and a second forcer located adjacent a second side of the first proof-mass. The PVR may include control circuitry configured to generate a reference voltage based on the oscillation frequency of the resonator, at least one converter configured to receive the reference voltage from the control circuitry, provide a first bias voltage to the first forcer based on the reference voltage, provide a second bias voltage to the second forcer based on the reference voltage, and periodically alter a polarity of the first and second bias voltages to drive the oscillation frequency to match a reference frequency, and an output configured to provide the reference voltage as a voltage reference signal.
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公开(公告)号：US12119760B1
公开(公告)日：2024-10-15
申请号：US17503300
申请日：2021-10-16
Applicant: The Charles Stark Draper Laboratory, Inc.
Inventor： Louis Beryl Kratchman , James A. Bickford , Kasey Russell , Paul A. Ward
Abstract: A control circuit for an electrostatic machine includes a current source or sink, an inductor, a switching network coupled between the current source or sink and the electrostatic machine, and between the inductor and the electrostatic machine. A controller is configured to automatically cause the switching network to connect the current source or sink to the electrostatic machine each half-cycle of a periodically alternating polarity. At each polarity alternation, the electrostatic machine is isolated from the current source or sink for a first period of time. At each polarity alternation, the inductor is connected to the electrostatic machine for a second period of time while the electrostatic machine is isolated from the current source or sink, and then disconnect the inductor from the electrostatic machine.
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公开(公告)号：US10345332B2
公开(公告)日：2019-07-09
申请号：US15288843
申请日：2016-10-07
Inventor： Jonathan J. Bernstein , Marc S. Weinberg , Amy Duwel , Paul A. Ward , Nicol E. McGruer , Matteo Rinaldi , Eugene H. Cook
IPC: G01P15/135 , H01H1/00 , H01H35/14
Abstract: An environmental physical sensor is provided that includes a power input terminal, a sensor output terminal, and a resonant switch. The resonant switch includes a mechanical element that is responsive to an environmental stimulus and is coupled to an electrical switch. The electrical switch is operable between an open position and a closed position and electrically connects the power input terminal to the sensor output terminal when in the closed position. The mechanical element is configured to intermittently actuate the electrical switch into the closed position responsive to the environmental stimulus.
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公开(公告)号：US20180292470A1
公开(公告)日：2018-10-11
申请号：US15944234
申请日：2018-04-03
Applicant: THE CHARLES STARK DRAPER LABORATORY, INC.
Inventor： James A. Bickford , Stephanie Lynne Golmon , Paul A. Ward , William D. Sawyer , Marc S. Weinberg , John J. LeBlanc , Louis Kratchman , James S. Pringle, JR. , Daniel Freeman , Amy Duwel , Max Lindsay Turnquist , Ronald Steven McNabb, JR. , William A. Lenk
Abstract: Aspects are generally directed to a compact and low-noise magnetic field detector, methods of operation, and methods of production thereof. In one example, a magnetic field detector includes a proof mass, a magnetic dipole source coupled to the proof mass, and a substrate having a substrate offset space defined therein, the proof mass being suspended above the substrate offset space. The magnetic field detector further includes a sense electrode disposed on the substrate within the substrate offset space and positioned proximate the proof mass, the sense electrode being configured to measure a change in capacitance relative to the proof mass from movement of the proof mass in response to a received magnetic field at the magnetic dipole source. The magnetic field detector includes a control circuit coupled to the sense electrode and configured to determine a characteristic of the magnetic field based on the measured change in capacitance.
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公开(公告)号：US11327102B2
公开(公告)日：2022-05-10
申请号：US17001899
申请日：2020-08-25
Applicant: THE CHARLES STARK DRAPER LABORATORY, INC.
Inventor： James A. Bickford , Stephanie Lynne Golmon , Paul A. Ward , William D. Sawyer , Marc Steven Weinberg , John J. Le Blanc , Louis Kratchman , James S. Pringle, Jr. , Daniel K. Freeman , Amy Duwel , Max Lindsay Turnquist , Ronald Steven McNabb, Jr. , William A. Lenk
IPC: G01R29/12 , G01R1/04 , G01R33/12 , G01R29/08 , G01R27/26 , G01R29/10 , A61B5/24 , A61B5/369 , A61B5/318
Abstract: Aspects are generally directed to a compact and low-noise electric field detector, methods of operation, and methods of production thereof. In one example, an electric field detector includes a proof mass, a source of concentrated charge coupled to the proof mass, and a substrate having a substrate offset space defined therein, the proof mass being suspended above the substrate offset space. The electric field detector further includes a sense electrode disposed on the substrate within the substrate offset space and proximate the proof mass, the sense electrode being configured to measure a change in capacitance relative to the proof mass from movement of the proof mass in response to a received electric field at the source of concentrated charge. The electric field detector includes a control circuit coupled to the sense electrode and configured to determine a characteristic of the electric field based on the measured change in capacitance.
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Patent Agency Ranking
公开(公告)号：US20170102263A1
公开(公告)日：2017-04-13
申请号：US15288843
申请日：2016-10-07
Inventor： Jonathan J. Bernstein , Marc S. Weinberg , Amy Duwel , Paul A. Ward , Nicol E. McGruer , Matteo Rinaldi , Eugene H. Cook
CPC classification number: G01P15/135 , H01H1/0036 , H01H35/144 , H01H2001/0063 , H01H2001/0078 , H01H2001/0084
Abstract: An environmental physical sensor is provided that includes a power input terminal, a sensor output terminal, and a resonant switch. The resonant switch includes a mechanical element that is responsive to an environmental stimulus and is coupled to an electrical switch. The electrical switch is operable between an open position and a closed position and electrically connects the power input terminal to the sensor output terminal when in the closed position. The mechanical element is configured to intermittently actuate the electrical switch into the closed position responsive to the environmental stimulus.
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公开(公告)号：US12163787B2
公开(公告)日：2024-12-10
申请号：US18067044
申请日：2022-12-16
Applicant: The Charles Stark Draper Laboratory, Inc.
Inventor： Paul A. Ward , Richard D. Elliott, III , Daniel Joseph Guyon
IPC: G01C19/5607 , H03F1/08
Abstract: A tuning fork sensor system places a controlled bias on the proof-mass drive-axis electrodes to cancel the quadrature charge. Also, its charge amplifiers employ a field-effect transistor biased slightly into the triode region so that it behaves as a very large value resistor. In addition, it uses a phase-locked loop having a special loop filter in order to optimize performance by rejecting off-frequency drive feedthrough to the motor pick-off while resulting in very low phase wander for the demodulation references.
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公开(公告)号：US11561094B2
公开(公告)日：2023-01-24
申请号：US16654626
申请日：2019-10-16
Applicant: The Charles Stark Draper Laboratory, Inc.
Inventor： Paul A. Ward , Richard D. Elliott, III , Daniel Joseph Guyon
IPC: G01C19/5607 , H03F1/08
Abstract: A tuning fork sensor system places a controlled bias on the proof-mass drive-axis electrodes to cancel the quadrature charge. Also, its charge amplifiers employ a field-effect transistor biased slightly into the triode region so that it behaves as a very large value resistor. In addition, it uses a phase-locked loop having a special loop filter in order to optimize performance by rejecting off-frequency drive feedthrough to the motor pick-off while resulting in very low phase wander for the demodulation references.
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公开(公告)号：US10859620B2
公开(公告)日：2020-12-08
申请号：US15944106
申请日：2018-04-03
Applicant: THE CHARLES STARK DRAPER LABORATORY, INC.
Inventor： James A. Bickford , Stephanie Lynne Golmon , Paul A. Ward , William D. Sawyer , Marc S. Weinberg , John J. LeBlanc , Louis Kratchman , James S. Pringle, Jr. , Daniel Freeman , Amy Duwel , Max Lindsay Turnquist , Ronald Steven McNabb, Jr. , William A. Lenk
IPC: G01R29/12 , G01R1/04 , G01R33/12 , G01R29/08 , G01R27/26 , A61B5/04 , A61B5/0476 , G01R29/10 , A61B5/0402
Abstract: Aspects are generally directed to a compact and low-noise electric field detector, methods of operation, and methods of production thereof. In one example, an electric field detector includes a proof mass, a source of concentrated charge coupled to the proof mass, and a substrate having a substrate offset space defined therein, the proof mass being suspended above the substrate offset space. The electric field detector further includes a sense electrode disposed on the substrate within the substrate offset space and proximate the proof mass, the sense electrode being configured to measure a change in capacitance relative to the proof mass from movement of the proof mass in response to a received electric field at the source of concentrated charge. The electric field detector includes a control circuit coupled to the sense electrode and configured to determine a characteristic of the electric field based on the measured change in capacitance.
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公开(公告)号：US10566974B2
公开(公告)日：2020-02-18
申请号：US16267861
申请日：2019-02-05
Applicant: THE CHARLES STARK DRAPER LABORATORY, INC.
Inventor： Paul A. Ward , James S. Pringle , Marc Steven Weinberg , Warner G. Harrison
IPC: H03K19/003 , H03B5/32 , H03H9/02 , H03H9/24 , H03L1/02 , G05F3/00 , H03L5/00 , H03L7/099 , H03B5/36 , G01P15/125 , G01P21/00 , H01L21/26
Abstract: Provided is a Precision Voltage Reference (PVR). In one example, the PVR includes a resonator having an oscillation frequency, the resonator including a first proof-mass, a first forcer located adjacent a first side of the first proof-mass, and a second forcer located adjacent a second side of the first proof-mass. The PVR may include control circuitry configured to generate a reference voltage based on the oscillation frequency of the resonator, at least one converter configured to receive the reference voltage from the control circuitry, provide a first bias voltage to the first forcer based on the reference voltage, provide a second bias voltage to the second forcer based on the reference voltage, and periodically alter a polarity of the first and second bias voltages to drive the oscillation frequency to match a reference frequency, and an output configured to provide the reference voltage as a voltage reference signal.
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