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公开(公告)号：US20230035141A1
公开(公告)日：2023-02-02
申请号：US17874265
申请日：2022-07-26
申请人： AIRA, INC.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A wireless charging device has a plurality of planar power transmitting coils arranged in two or more layers between a charging surface and a ferrite layer, and a driver circuit configured to provide a charging current to one or more of the plurality of planar power transmitting coils when a chargeable device is placed on or near the wireless charging device. Each planar power transmitting coil may be formed as a spiral winding surrounding a power transfer area. Inductance of each of the plurality of planar power transmitting coils measured at the charging surface varies from a nominal inductance value by less than ten percent.
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公开(公告)号：US11469724B2
公开(公告)日：2022-10-11
申请号：US17103940
申请日：2020-11-24
申请人： AIRA, Inc.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A charging apparatus has an amplifier stage, a power switching stage and a controller. The amplifier stage has a choke that receives a current from an input of the amplifier stage, a resonant network coupled to an output of the choke and that provides an output current to a load, and a first switch configured to short the output of the choke to circuit ground when turned on. The power switching stage may be configured to couple a power supply to the input of the amplifier stage and may have a second switch operable to couple the input of the amplifier stage to circuit ground when turned on. The controller may be configured to control operation of the first switch and the second switch in accordance with a timing sequence that defines a cycle of the output current.
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公开(公告)号：US11462944B2
公开(公告)日：2022-10-04
申请号：US16893420
申请日：2020-06-04
申请人： AIRA, Inc.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A charging device has a resonant circuit that includes a transmitting coil. The charging device also has a driver circuit configured to power the resonant circuit, a pulse width modulator and a controller configured to provide a control signal to the pulse width modulator the control signal configuring the pulse width to provide a modulated drive signal to the driver circuit. The pulse width modulator is configured to provide the modulated drive signal to the resonant circuit. The resonant circuit is configured to operate as a low-pass filter that blocks frequency components of the modulated drive signal that correspond to the reference signal. The driver circuit is configured to use the modulated drive signal to produce a charging current in the resonant circuit. The charging current causes power to be wirelessly transferred to a receiving device through the transmitting coil.
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公开(公告)号：US20220311278A1
公开(公告)日：2022-09-29
申请号：US17703978
申请日：2022-03-24
申请人： AIRA, INC.
发明人： Eric Heindel Goodchild , Magne Nerheim , Simon McElrea , Aleksandar Petrovic , Mohammad Ali Saket Tokaldani , James Scott
摘要： Systems, methods and apparatus for wireless charging are disclosed. A wireless charging device has a plurality of planar power transmitting coils, a coil substrate and a driver circuit. Each planar power transmitting coil may be formed as a spiral winding surrounding a power transfer area. In one example, each planar power transmitting coil is formed by spiral winding a multi-strand wire, each strand in the multistrand wire being electrically insulated from each other strand in the multi-strand wire. The coil substrate may have a plurality of cutouts formed therein. The plurality of cutouts may be configured to secure the planar power transmitting coils in a preconfigured three-dimensional arrangement. The driver circuit may be configured to provide a charging current to one or more of the planar power transmitting coils when a chargeable device is placed on or near the wireless charging device.
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公开(公告)号：US20210384777A1
公开(公告)日：2021-12-09
申请号：US16893424
申请日：2020-06-04
申请人： AIRA, Inc.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A method for operating a charging device includes providing a charging current to a resonant circuit when a receiving device is present on a surface of the wireless charging device, providing a zero-crossing signal that includes edges corresponding to transitions of a voltage measured across the resonant circuit through a zero volt level or to transitions of a current in the resonant circuit through a zero ampere level, providing a measurement slot by decreasing or terminating the charging current for a period of time, and determining whether an object other than the receiving device is present on a surface of the charging device based on measurements of samples of voltage or current captured based on timing provided by the zero-crossing signal, wherein the samples are captured during the measurement slot.
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公开(公告)号：US11171502B2
公开(公告)日：2021-11-09
申请号：US16283734
申请日：2019-02-22
申请人： AIRA, INC.
发明人： Eric Goodchild , Jake Slatnick
摘要： Systems, methods and apparatus for wireless charging are disclosed. An apparatus has a wireless charging apparatus has a battery charging power source coupled to a charging circuit, a plurality of charging cells configured to provide a charging surface, and a controller. The controller may be configured to provide a pulse to the charging circuit, detect a frequency of oscillation of the charging circuit responsive to the pulse or a rate of decay of the oscillation of the charging circuit, and determine that a chargeable device has been placed in proximity to a coil of the charging circuit based on changes in a characteristic of the charging circuit. The pulse may have a duration that is less than half the period of a nominal resonant frequency of the charging circuit.
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公开(公告)号：US20210249911A1
公开(公告)日：2021-08-12
申请号：US17168161
申请日：2021-02-04
申请人： AIRA, INC.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A method for configuring a charging device includes identifying a first plurality of transmitting coils arranged in a modular pattern on a first printed circuit board, the first plurality of transmitting coils defining a first charging surface, identifying a second plurality of transmitting coils arranged in the modular pattern on a second printed circuit board, the second plurality of transmitting coils defining a second charging surface, determining an alignment of the first printed circuit board with the second printed circuit board, providing a charging current to the first charging surface and the second charging surface, and selecting one or more transmitting coils to receive the charging current. Each of the one or more transmitting coils is provided in the first plurality of transmitting coils or the second plurality of transmitting coils.
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公开(公告)号：US20210249879A1
公开(公告)日：2021-08-12
申请号：US17168165
申请日：2021-02-04
申请人： AIRA, INC.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A charging apparatus has a first printed circuit board configured to be mounted proximate to a wall of a container that provides a partially-enclosed interior and one or more transmitting coils arranged on at least one surface of the first printed circuit board and configured to generate an electromagnetic flux within the partially-enclosed interior in response to a charging current received from a controller. The charging current may be received when a chargeable device has been placed within the partially-enclosed interior.
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公开(公告)号：US20210249876A1
公开(公告)日：2021-08-12
申请号：US17168169
申请日：2021-02-04
申请人： AIRA, INC.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A first charging device has a first plurality of transmitting coils arranged in a pattern thereon, the first plurality of transmitting coils defining a first charging surface, a second charging device having a second plurality of transmitting coils arranged in the pattern thereon, the second plurality of transmitting coils defining a second charging surface, a communication bus coupled to the first charging device and the second charging device, an interconnect configured to conduct a charging current to the first charging device and the second charging device, and a processor configured to select one or more transmitting coils to receive the charging current, where each of the one or more transmitting coils is provided in the first plurality of transmitting coils or the second plurality of transmitting coils.
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公开(公告)号：US20210226480A1
公开(公告)日：2021-07-22
申请号：US17153880
申请日：2021-01-21
申请人： AIRA, INC.
摘要： Systems, methods and apparatus for wireless charging are disclosed. A test apparatus has a receiving head configured to provide a measurement signal representative of electromagnetic flux received from one or more transmitting coils of a wireless charging surface, a numerically-controlled stage configured to position the receiving head at a selected point in three-dimensional space above wireless charging surface, and a processor configured to cause the numerically-controlled stage to position the receiving head at the selected point in three-dimensional space, and use the measurement signal to determine magnitude of the electromagnetic flux or power received from the wireless charging surface proximate to the selected point in three-dimensional space.
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