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公开(公告)号：US12149106B2
公开(公告)日：2024-11-19
申请号：US18405408
申请日：2024-01-05
Applicant: Google LLC
Inventor： Michael Jonathon Chen , William Alan Saperstein , James Robert Lim , David Wang
Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.
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公开(公告)号：US11802713B2
公开(公告)日：2023-10-31
申请号：US17581081
申请日：2022-01-21
Applicant: Google LLC
Inventor： Daniel Adam Warren , Eric Marschalkowski , William Alan Saperstein
CPC classification number: F24F11/88 , F24F11/30 , H02J50/001 , F24F2110/10 , H02J50/10 , H02M7/06
Abstract: A device may include a rectifier circuit providing a rectified DC signal, a rechargeable energy-storage element, and a power-management integrated circuit (PMIC). The PMIC may include a charging circuit for the rechargeable energy-storage element; a current-sensing circuit that measures a current provided by the rectified DC signal; a programmable current limit; a voltage-sensing circuit that measures a voltage on the rechargeable energy-storage element; and a controller that regulates the current provided to a DC output of the PMIC. the DC output of the PMIC may be regulated based at least in part on the current provided by the rectified DC signal; the programmable current limit; and the voltage on the rechargeable energy-storage element. The DC output of the PMIC may provide energy to a plurality of other energy-consuming subsystems on the device and to the charging circuit for the rechargeable energy-storage element.
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公开(公告)号：US11901751B2
公开(公告)日：2024-02-13
申请号：US17319815
申请日：2021-05-13
Applicant: Google LLC
Inventor： Michael Jonathon Chen , William Alan Saperstein , James Robert Lim , David Wang
CPC classification number: H02J7/00308 , H02J7/0031 , H02J7/00302 , H02J7/007182
Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.
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公开(公告)号：US11264833B2
公开(公告)日：2022-03-01
申请号：US17030757
申请日：2020-09-24
Applicant: Google LLC
Inventor： Daniel Adam Warren , Eric Marschalkowski , William Alan Saperstein
Abstract: A device may include a rectifier circuit providing a rectified DC signal, a rechargeable energy-storage element, and a power-management integrated circuit (PMIC). The PMIC may include a charging circuit for the rechargeable energy-storage element; a current-sensing circuit that measures a current provided by the rectified DC signal; a programmable current limit; a voltage-sensing circuit that measures a voltage on the rechargeable energy-storage element; and a controller that regulates the current provided to a DC output of the PMIC. the DC output of the PMIC may be regulated based at least in part on the current provided by the rectified DC signal; the programmable current limit; and the voltage on the rechargeable energy-storage element. The DC output of the PMIC may provide energy to a plurality of other energy-consuming subsystems on the device and to the charging circuit for the rechargeable energy-storage element.
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公开(公告)号：US20240154435A1
公开(公告)日：2024-05-09
申请号：US18405408
申请日：2024-01-05
Applicant: Google LLC
Inventor： Michael Jonathon Chen , William Alan Saperstein , James Robert Lim , David Wang
IPC: H02J7/00
CPC classification number: H02J7/00308 , H02J7/00302 , H02J7/0031 , H02J7/007182
Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.
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Patent Agency Ranking
公开(公告)号：US10819148B2
公开(公告)日：2020-10-27
申请号：US15680632
申请日：2017-08-18
Applicant: Google LLC
Inventor： Daniel Adam Warren , Eric Marschalkowski , William Alan Saperstein
Abstract: A smart-home device may include an energy-storage element that stores energy that is harvested from an environmental system and a solid state relay (SSR) switching integrated circuit (IC). The SSR switching IC may include switching elements that operate in a first state and a second state. The IC may also include a control circuit that causes the switching elements to operate in the first state to activate a function of the environmental system until the energy-storage element has dropped below a threshold. The control circuit may also cause the switching elements to operate in the second state and harvest energy from the environmental system, determine that a first time has elapsed since the switching elements began operating in the second state, and cause the one or more switching elements to again operate in the first state.
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公开(公告)号：US12078694B2
公开(公告)日：2024-09-03
申请号：US17624967
申请日：2020-07-29
Applicant: Google LLC
Inventor： Aditya Shailesh Ghadiali , William Alan Saperstein
IPC: G01R33/038 , G01D5/14 , G01R33/07 , G08B13/14 , G08B13/196 , H04N23/50 , H04N23/667
CPC classification number: G01R33/038 , G01D5/145 , G01R33/072 , G08B13/149 , G08B13/19632 , H04N23/50 , H04N23/667
Abstract: An electronic device including a mounting device configured to couple to a surface, a head removably coupled to the mounting device and including a housing, a magnet attached to the mounting device, and a sensor disposed within the housing. The sensor detects a magnetic field associated with the magnet when the head is in a first position relative to the mounting device and detects the magnetic field associated with the magnet when the head is in a second position relative to the mounting device, the second position being different than the first position.
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公开(公告)号：US20220239134A1
公开(公告)日：2022-07-28
申请号：US17319815
申请日：2021-05-13
Applicant: Google LLC
Inventor： Michael Jonathon Chen , William Alan Saperstein , James Robert Lim , David Wang
IPC: H02J7/00
Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.
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公开(公告)号：US20240369650A1
公开(公告)日：2024-11-07
申请号：US18774690
申请日：2024-07-16
Applicant: Google LLC
Inventor： Aditya Shailesh Ghadiali , William Alan Saperstein
IPC: G01R33/038 , G01D5/14 , G01R33/07 , G08B13/14 , G08B13/196 , H04N23/50 , H04N23/667
Abstract: An electronic device including a mounting device configured to couple to a surface, a head removably coupled to the mounting device and including a housing, a magnet attached to the mounting device, and a sensor disposed within the housing. The sensor detects a magnetic field associated with the magnet when the head is in a first position relative to the mounting device and detects the magnetic field associated with the magnet when the head is in a second position relative to the mounting device, the second position being different than the first position.
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公开(公告)号：US20220285957A1
公开(公告)日：2022-09-08
申请号：US17195305
申请日：2021-03-08
Applicant: Google LLC
Inventor： James Robert Lim , Michael Jonathon Chen , Mitchell Aaron Jones , William Alan Saperstein , David Wang
IPC: H02J7/00
Abstract: Techniques to detect faults in a battery with at least two parallel battery cells. In some examples, a cell may fail or become disconnected. The circuitry of this disclosure may determine whether a battery pack has a fault by measuring battery parameters at the positive and negative terminals. When the circuitry detects a fault, the circuitry may adjust the charge rate so that the charge does not exceed the maximum charge rate of any single cell of the battery pack. In some examples, the circuitry may shut off the charge current to the battery pack to ensure that the charge rate does not exceed the maximum charge rate of any single cell. To avoid false positive fault detection, the circuitry of this disclosure may verify the detected fault and the parameters of the charging cycle before reducing the charging current.
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